The World of Ham Radio CD-ROM From Unknown Fri Jan 05 11:40:30 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: thamm40820@aol.com (THamm40820) Newsgroups: rec.radio.amateur.antenna Subject: Best counterpoise ?? Date: 1 Jan 1996 00:41:46 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 35 Sender: root@newsbf02.news.aol.com Message-ID: <4c7s6q$g8l@newsbf02.news.aol.com> Reply-To: thamm40820@aol.com (THamm40820) NNTP-Posting-Host: newsbf02.mail.aol.com Hi, I like random wires for several reasons, but because I work 100% QRP, I DO need to make the antenna as efficient as possible. The antenna is to be used on all bands 160-10 with an ATU. The “right” side of the antenna goes out the shack window about 10 feet, then up 10 feet, then horizontal 35 feet, the up 15 more feet, like so: | | __________________________________| | ______| (Hold your applause foe the graphic please!) Now, as for the “left” half of the antenna, I’ve tried several approches. 1) The “W3EDP” approach which is to add a counterpoise long enough to get an integral number of 1/2 waves on the wire. For example on 40 meters, at 7.125 Mhz, I used a counterpoise of 4’ 4” leaving 65’ 8” to radiate (4’ 4” of the “right” side being “canceled out” by the counterpoise). 2) I hung about 85 feet of wire along a 4 foot high wood fence, roughly parallel to the antenna itself. I tuned this with an MFJ artificial ground and used it as a counterpoise. I’ve also tried this without the AG, connecting the ground wire directly to the tuner, since this just becomes an OCF dipole. Not much worry about imbalance and feedline radiation since there’s no feedline, at least not in the usual sense. 3) The one thing I haven’t tried is to use a counterpoise wire cut exactly to 1/4 wave since this would seem to put the highest current part of the antenna at my ham desk instead of outside along the antenna wire. No one of these setups *seems* to work any better than another on either transmit or receive. SO--- the question is, which one is actually the best? Which one actually puts the most power in the antenna and not the counterpoise? Thanks for comments and 73s, Tommy, KI7KH From Unknown Fri Jan 05 11:40:31 1996 Path: news.epix.net!news.sprintlink.net!gate.net!news-adm From: Bob North Newsgroups: rec.radio.amateur.antenna Subject: SGC Smart Tuner Date: 1 Jan 1996 04:43:04 GMT Organization: B & B Imports Lines: 7 Message-ID: <4c7ooo$19fo@news.gate.net> NNTP-Posting-Host: tpafl2-8.gate.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) I live in a townhouse and am considering a long wire with a "Smart Tuner." Would certainly appreciate hearing any comments re TVI etc. Thanks, Bob (N6JSC) From Unknown Fri Jan 05 11:40:32 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!hermes.louisville.edu!news From: "David E. Shelton" Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Titan vs Cushcraft R7??? Date: 1 Jan 1996 06:07:14 GMT Organization: University of Louisville, School of Nursing Lines: 27 Message-ID: <4c7tmi$coi@hermes.louisville.edu> References: <4bs7k5$b9q@newsbf02.news.aol.com> NNTP-Posting-Host: deshel01.remote.louisville.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: caseycct@ridgecrest.ca.us Erik, You made the right choice I run a R7 and Butternut HF2V (40/80M vert.) I would strongly discourage attempting to work 75/80M with the R7 as your neighbors will hate you and the balun matching unit could be damaged, this of course is dependent on the amount of power being used. However, I would not recommend doing this at all. I have no experience with the Gap antenna so I can say nothing about them. However, I can say that the Cushcraft R7 is a wonderful piece of equipment for any shack. I bought mine from another ham used and he had it for 2-3yrs before me. I have had it for 3yrs and love it works fantastic on 17,15, es 10M. Performance is not as good on the 40M band because of the size compromise. That is where the Butternut HF2V comes in its a full 1/4 wavelength on 40M and 1/8 wavelength on 80M. The Butternut is a dream of an antenna signal reports are always better on the Butternut when compared to the R7 on 40M, you just cannot get away from the bigger is better philosophy. I will soon be adding the 160M resonator to the Butternut and possibly the 30M one also. I think you will have a lot of fun with the R7 and 10-40M, I would also strongly discourage the running of the R7 in 40M outside of the <2:1 SWR curve of 50 kHz. The curve is very steep and the RFI will run rampant throughout your neighborhood. Hope this helps, de KE4FPS, David From Unknown Fri Jan 05 11:40:33 1996 Path: news.epix.net!news.sprintlink.net!oronet!uniserv2!van-bc!news.mindlink.net!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in1.uu.net!meaddata!newsjunkie.ans.net!hermes.louisville.edu!news From: "David E. Shelton" Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP! R-7 Problem? Date: 1 Jan 1996 06:15:21 GMT Organization: University of Louisville, School of Nursing Lines: 16 Message-ID: <4c7u5p$coi@hermes.louisville.edu> References: <772665310.35934639@acd.org> NNTP-Posting-Host: deshel01.remote.louisville.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: Gary_Danaher@acd.org Gary, I run an R7 with my Icom 728. You most definitely have a short in the coax or the antenna feedpoint or possibly in one of the coils or balun matching unit. I would of course not use the antenna when it is raining and get up on the roof or where the R7 is and very closely inspect all of the above mentioned items for possible cracks or any possible access water could have in to cause this shorting out and sending the SWR so high. Check it out I feel pretty strongly that I'm right on the money here. 73, de KE4FPS, David From Unknown Fri Jan 05 11:40:34 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.antenna Subject: Re: feeding rotatable antenna with ladder line Date: Mon, 01 Jan 96 07:19:03 GMT Lines: 34 Message-ID: <820524444.25264@pinetree.microserve.com> References: <32387.tmedin@che2.che.umn.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 tmedin@che2.CHe.umn.EDU (tom medin) wrote: >well, i now plan on open wire up to the mast (in the spring). the >reason for this is to be able to use the 20m monobander antenna on >most higher bands (30m - 10m), so i will see quite high SWR, on some >bands. i just want a way to get past the rotating point with "no" >loss in a high SWR line. In that case, you will need to make the coaxial section as short as possible, to minimize loss. Also, you will need to be certain that the voltage rating of the cable is sufficient. Personally, I think you're going to a lot of trouble for nothing. The parasitic elements won't be resonant on the other bands - why bother to use the antenna this way? You'd be better off to feed the antenna with coax on 20M only, and to install a non-resonant dipole with a separate ladder- line feeder. >now there seems to be a thread on balanced tuners. what's wrong with >the "Balanced Balanced Antenna Tuner" balanced L network in Feb '90 >QST? I don't have that article, but I believe you're referring to the "Measures" tuner. The problem with that approach is that the tuned components don't protect the balun against high common-mode voltage generated on the line. The balanced L or Pi certainly is a convenient method of tuner construction, but it really needs a low-capacitance input transformer (balun) to be assured of proper operation. I haven't been able to design a satisfactory device of that type in my rudimentary workshop, so I'm gathering parts for a link-coupled tuner. There was a long thread about all this a couple months ago. 73, Jack WB3U From Unknown Fri Jan 05 11:40:35 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.antenna Subject: Re: Twin-lead To trap vert.? Date: Mon, 01 Jan 96 07:25:31 GMT Lines: 11 Message-ID: <820524838.25264@pinetree.microserve.com> References: <820372392.AA04781@hamlink.mn.org> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Glenn.Schultz@f100.n282.z1.fidonet.org (Glenn Schultz) wrote: >Hi All, Has anyone ever tried feeding a trap vertical with twin lead? >or any other vertical for that matter? A trap vertical should be reasonably well-matched to coax. Why do you want to feed it with balanced line? 73, Jack WB3U From Unknown Fri Jan 05 11:40:36 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: comp.security.misc,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,comp.security.unix Subject: TSCM Counter Surveillance, Privacy, & Security Page Date: Mon, 01 Jan 1996 08:42:16 -0500 Organization: tscm.com Lines: 10 Message-ID: Reply-To: jmatk@tscm.com NNTP-Posting-Host: jmatk.tiac.net Keywords: Security Counterintelligence Debugging Surviellance Wiretap X-Newsreader: Yet Another NewsWatcher 2.1.3 Xref: news.epix.net comp.security.misc:24516 rec.radio.amateur.antenna:18162 rec.radio.amateur.equipment:23287 rec.radio.amateur.misc:96340 comp.security.unix:23045 Happy New Year!!!!! TSCM, Counter Surveillance and Debugging Page new materials... Check it out... http://www.tscm.com/ Large section on TSCM test equipment Large section on TSCM training and career paths - James M. Atkinson "...shaken, not stirred" From Unknown Fri Jan 05 11:40:37 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: krin135@aol.com (Krin135) Newsgroups: rec.radio.amateur.antenna Subject: Re: Improving mobile phone fringe reception? Date: 1 Jan 1996 08:58:05 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 8 Sender: root@newsbf02.news.aol.com Message-ID: <4c8p9d$mr8@newsbf02.news.aol.com> References: <4c4e59$lnu@classic.iinet.com.au> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader antennas for 1.2 gig should not be too hard to find figures for- just recalc the lengths for the 870 band kc5evn "We must All hang together, else we most assuradly will Hang separately" Benjamin Franklin, 1776 Charles S. Krin, DO FAAFP From Unknown Fri Jan 05 11:40:38 1996 Path: news.epix.net!news.sprintlink.net!grumman.com!grumman.com!not-for-mail From: bat@gateway.grumman.com (Pat Masterson) Newsgroups: rec.radio.amateur.antenna Subject: 3/4 wave vertical on 20m ? Date: 1 Jan 1996 10:29:59 -0500 Organization: Grumman Data Systems, Bethpage, New York, USA. Lines: 17 Message-ID: <4c8uln$ck0@gateway.grumman.com> NNTP-Posting-Host: gateway.grumman.com OK, its January now, so I'm beginning to think about Field Day antennas. Our club usually erects about 4 of those telescoping 50 foot poles in a straight line. One has a tribander on top, and all are used to hold up some 40m and 80m dipoles. I was thinking of using one of the poles as a 3/4 wave vertical on 20 meters, since 50 feet seems to be about the right number. We'll lay a bunch of radials on the ground, and go at it. Will this work OK? I assume the impedance should be near 50, but I'll use a tuner if necessary, because I wont be able to adjust the lenght at all. Any ideas? -pat -- * Pat Masterson B38-111, Northrop Grumman Corp.* Ham:KE2LJ * 1111 Stewart Ave., Bethpage NY 11714 * Packet: KE2LJ@KC2FD.NY * 516-346-6316 * President Grumman Amateur * email: bat@grumman.com * Radio Club WA2LQO From Unknown Fri Jan 05 11:40:39 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!scsing.switch.ch!news.rediris.es!news.belnet.be!chaos.kulnet.kuleuven.ac.be!idefix.CS.kuleuven.ac.be!Belgium.EU.net!news From: alcon.couvreur@pophost.eunet.be Newsgroups: rec.radio.amateur.antenna Subject: Which type of antenna for 77.5 kHz ? Date: Mon, 01 Jan 96 11:29:22 PDT Organization: EUnet Belgium, Leuven, Belgium Lines: 10 Message-ID: NNTP-Posting-Host: dialup16.antwerp.eunet.be Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage I want to build a receiver for the German time transmitter in Frankfurt which operates at 77.5 kHz. Which type of antenna do I need ? Thanks for replying to this message !!! From Unknown Fri Jan 05 11:40:40 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: Mon, 01 Jan 1996 13:00:55 -0800 Organization: American Radio Relay League Lines: 40 Message-ID: <30E84B87.5A86@arrl.org> References: <4c5st7$nf2@newsbf02.news.aol.com> <4c6hlh$vt@newsbf02.news.aol.com> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) W8JI Tom wrote: > One area almost always ignored, and one >the modeling program you are using > won't handle, are near-field ground losses >in the area of the antenna. The > second is the power actually radiated >along the wire. Kuecklin had an > excellent book (now out of print) >detailing actual measurements of > Rhombics, V's, and other long >wire arrays in real test range (reformatted for easier reading) Why do you think the ground losses are so important? People routinely get excellent results from dipoles that aren't very high, as long as they use them for high angle paths. I'd be more worried about optimizing the signal at the angles of radiation that are best for the paths I'm trying to work, instead of worrying about a little bit of ground loss. The former can affect signals by 10s of dB, while the latter is undoubtedly in the single dB range. Having a steerable phased array would certainly be an advantage in reducing the problem of pattern nulls. I wouldn't be surprised if an analysis of the W6AM rhombic farm showed that too much height reduced the signal at the optimum angles of radiation for some 20 meter paths. The "problem" is the sloping terrain, which allow signals at very low angles of radiation. Zack KH6CP/1 zlau@arrl.org From Unknown Fri Jan 05 11:40:42 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.cs.utah.edu!cc.usu.edu!lwoert From: lwoert@cc.usu.edu Newsgroups: rec.radio.amateur.antenna Subject: fm dipole? Message-ID: <1996Jan1.131408.70253@cc.usu.edu> Date: 1 Jan 96 13:14:08 MDT Organization: Utah State University Lines: 3 Can anyone out there give me instructions for making a dipole using 300 ohm t.v. wire for fm broadcast stations? I live in a marginal sig strength area. Thanks, John N7ESP From Unknown Fri Jan 05 11:40:42 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: zaax@aol.com (ZaaX) Newsgroups: rec.radio.amateur.antenna Subject: Butternut 80/40 Vertical Any Good? Date: 1 Jan 1996 14:42:26 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <4c9df2$t94@newsbf02.news.aol.com> Reply-To: zaax@aol.com (ZaaX) NNTP-Posting-Host: newsbf02.mail.aol.com Is the Butternut HF-2V for 80 + 40 meters any good. I would appreciate hearing from anyone that owns one of these. 73 Zack N8FNR From Unknown Fri Jan 05 11:40:43 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!nuclear.microserve.net!news.paonline.com!usenet From: VJKunesJr@spacetech.com Newsgroups: rec.radio.amateur.antenna Subject: Hustler 10-80 vertical Date: 1 Jan 1996 16:40:28 GMT Organization: Pennsylvania Online [Usenet News Server for Hire] Lines: 2 Message-ID: <4c92ps$cl0@news.paonline.com> NNTP-Posting-Host: 206.25.244.100 X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Anyone had any experience with these antennas? Haviing a hard time tuning it. Possibly could be because I'm next to a hill. Have correct ground radials for each band(min of 4) so that shouldn't be a problem. Any advice would be appreciated. From Unknown Fri Jan 05 11:40:44 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: Mon, 01 Jan 96 18:31:44 GMT Lines: 36 Message-ID: <820564809.13886@pinetree.microserve.com> References: <4c6i7c$olr@chnews.ch.intel.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 cmoore@vegas.ch.intel.com (Cecil A. Moore~) wrote: >Bought me a SB-201 for Xmas. Two tubes and a pi-net output. Congratulations! Now you can share your stories of melted coax and arc'd tuner parts with the rest of us victims. I love QRO!!! >The load is 100 ohms, resistive, and I think the pi-net >achieves a conjugate match with no reflections. The SB-201 >SWR meter is calibrated for 50 ohms and reads 2:1 What >function does the SWR meter serve? The manual says not to >allow the SWR over 3:1 but the SWR meter is not measuring >the SWR unless it's a flat 50 ohm system. I thought the SB-200/201 series used a toroidal pickup? No? >Anybody know the conjugate matching range of the SB-201? Probably even the Heath engineers don't know. The 3:1 limitation is the result of concerns for the increased voltage at the output circuitry of the amplifier, not the matching range of the Pi. Take a look at the spacing on the loading capacitor and you'll see what I mean. Incidentally, I use non-foam RG-58 in the shack at the output of my amp to eliminate the mess that would have resulted from connecting all the inline accessories with RG-8. To avoid damaging the cable, I *always* bring the SWR down to less than 1.5:1 before activating the amp, and usually operate with a match of 1.1:1 or better. Generally, I run between 500W and 1KW peak output, and so far, so good. I'm just mentioning this in case you're looking for more excitement in your life. ;) 73, Jack WB3U From Unknown Fri Jan 05 11:40:45 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Doty article once ag˙˙˙˙˙ Date: 1 Jan 1996 18:53:30 GMT Organization: Intel Corporation, Chandler, AZ Lines: 12 Distribution: world Message-ID: <4c9aja$soc@chnews.ch.intel.com> References: <4bmo81$ots@hpscit.sc.hp.com> <4boukb$81i@newsbf02.news.aol.com> NNTP-Posting-Host: vegas.ch.intel.com In article <4boukb$81i@newsbf02.news.aol.com>, W8JI Tom wrote: >Things that re-write history should be tested before print. It isn't the >fact of not having heard before. It's more a matter of printing things >that defy common sense, especially when they can be confirmed in a matter >of minutes. But Tom, look at the bright side. Years from now, you may become famous for "discovering" the conjugate match. :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Fri Jan 05 11:40:46 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.alt.net!news1.alt.net!news.aros.net!usenet From: mfp@aros.net (mfp) Newsgroups: rec.radio.amateur.antenna Subject: Test Date: 1 Jan 1996 18:59:04 GMT Organization: ArosNet Lines: 2 Message-ID: <4c9ato$2m5@news.aros.net> NNTP-Posting-Host: anp26.aros.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Test From Unknown Fri Jan 05 11:40:47 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!usenet From: "Mark G. Wiltrakis" Newsgroups: rec.radio.amateur.antenna Subject: Satellite antennas and trees Date: 1 Jan 1996 19:06:38 GMT Organization: Teleport - Portland's Public Access (503) 220-1016 Lines: 14 Message-ID: <4c9bbu$lqg@maureen.teleport.com> NNTP-Posting-Host: ip-pdx10-26.teleport.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) I'm in the process of putting together a satellite station. I need some advice regarding location of antennas for 2M and 440: I have several siting options on my property, each with particular advantages and disadvantages. How important is having a "clear shot" at the satellite from the antenna?? How much of a factor on xmit/receive are trees in the near field, or at a distance (>100 feet)??? Thanks for your thoughts! 73, Mark N7MMQ Hillsboro, OR From Unknown Fri Jan 05 11:40:48 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Which type of antenna for 77.5 kHz ? Date: 1 Jan 1996 20:01:19 GMT Organization: LI Net (Long Island Network) Lines: 23 Message-ID: <4c9eig$lsb@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] For 100 KHz LORAN, I have seen short whips used on mobile units like cars and airplanes. For fixed service, my own experience favors a good sized loop, maybe a meter or two in diameter, tuned and coupled for maximum sensitivity. A loop will be directional, allowing you to null out some interference sources. I have a portable all-band receiver which uses a ferrite loopstick down to 150 KHz, with reasonably good results. Perhaps a large loopstick, maybe around 20 or 30 centimeters long, could be wound with enough turns and tuned to 77.5 KHz, and coupled into your receiver. At such a low frequency, atmospheric and man-made electrical noise will be very strong, so the ultimate in sensitivity is not needed. If you opt for the short whip, use low-capacitance feedline and connect it to a high-Q tuned circuit resonant at 77.5 KHz, and then couple that to your receiver with a few turns of wire as a coupling link. My guess is that you want a high-L, low-C input tuned circuit, and a short, low-C feedline, if you use a short whip. Maybe you could modify an old AM radio with a ferrite loopstick, which tunes the longwave broadcast band. Bob Bruhns, WA3WDR, bbruhns@li.net From Unknown Fri Jan 05 11:40:49 1996 Path: news.epix.net!news.sprintlink.net!hookup!news.nstn.ca!news.cs.indiana.edu!umn.edu!newsstand.tc.umn.edu!gold.tc.umn.edu!dwar0001 From: dwar0001@gold.tc.umn.edu (Robert M Dwarkin) Newsgroups: rec.radio.amateur.antenna Subject: Antenna (80m from MN to CT) Date: 1 Jan 1996 20:08:24 GMT Organization: University of Minnesota Lines: 11 Message-ID: <4c9evo$h33@epx.cis.umn.edu> NNTP-Posting-Host: gold.tc.umn.edu X-Newsreader: TIN [version 1.2 PL2] Hello- I am interested in suggestions for 80m band antenna. To be considered, the desired communication path will primarily be from MN to CT ... Thanks. -Rob From Unknown Fri Jan 05 11:40:50 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW From: sabinw@crpl.cedar-rapids.lib.ia.us Newsgroups: rec.radio.amateur.antenna Subject: Peer review Date: 1 Jan 1996 21:10:29 GMT Organization: Cedar Rapids Public Library, Cedar Rapids, IA, 52401 Lines: 58 Distribution: world Message-ID: <4c9ik5$gs4@flood.weeg.uiowa.edu> Reply-To: SABINW@crpl.cedar-rapids.lib.ia.us NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us I would like to make a few remarks about Peer Review. As an author of very many technical articles, both Company in-house and published in journals, both Amateur and Professional, and as Co-Editor (and contributing author) of two technical books, published by McGraw-Hill, it is a subject that I think I know something about (more so than antennas, where my amateur status is now and forever secure). 1) When you have an article published you are always taking a chance. You work *very* hard to put out the best work that you know how to do. You get inputs from colleagues. You ask for reviews from those who are knowledgeable on the subject. You rework the material to the point that you get sick and tired of looking at it. 2) Finally, the article is published. And then you, or someone else, discovers that you a) left out something, b) didn't explain something carefully enough or c) you made a technical error of some kind. Then you write a Technical Correspondence or a Feedback segment, or something equivalent, where you have to "eat some crow" and try to make it all better. 3) Something else can happen. Further improvements in your understanding, or some input from a reader, helps you to a better appreciation of the subject. This has happened to me more times than I can remember. Technical knowledge is an ongoing thing and you say "why didn't I think of that!!!!!". And one other thing: *NO* subject is a closed book. We are always updating and improving the works of the past. I can think of many highly respected works and authors that have been refined, corrected, improved and better explained over the years. No author should feel "put down" about that. 4) So you are taking a chance. You are putting your credibility on the line. And there is no shortage of critics who will put the prod to you. It takes three things to deal with that: a) humility, b) a good sense of self-worth and c) a sense of humor. And some of the critics can be like "Ming the Merciless". It goes with the territory. 5) About Peer Review: a) the Peer who reviews has very rarely put in the effort to review that you have put into the writing, b) I have been reviewed by some who have deeply held beliefs that do not agree with my best understanding and to which I will not agree, c) it is a fact that sometimes those who claim the right to wear the black robe and sit on the Judge's bench really need to be on the witness stand. 6) Sometimes critics and reviewers can be abrasive and belittling "horse's butts" and they alienate a lot of their "victims" and also the good friends of their victims. Unfortunately, it is also true that quite often we have to listen to these people. Sometimes they speak the truth. 7) It is equally true that an author should not let himself be intimidated by the "turf guardians" who will resent his intrusions and try to belittle him or indulge in patronizing lectures. 8) Those who sit on the sideline and pick apart an author, based on their own "findings" or "conclusions" should submit their efforts for the same peer review as the author. That is a good thing about the internet and I see it happening. I also see it *not* happening. From Unknown Fri Jan 05 11:40:52 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!ihnp4.ucsd.edu!news.cerf.net!ni1.ni.net!xband.ni.net!user From: blanton@ni.net (J. L. Blanton) Newsgroups: rec.radio.amateur.antenna Subject: Re: LPDA dimensions anyone? Date: Mon, 01 Jan 1996 21:44:02 -0800 Organization: Network Intensive Lines: 20 Message-ID: References: NNTP-Posting-Host: xband.ni.net In article , will@epix.net wrote: > Anybody know the element dimensions for a 5-element 10/12/15/17/20m > Log Periodic Dipole Array. I have one but not too interested in climbing > the tower to measure right now - and I have a South American contact who > is eager to build one. Element dimensions of log-periodic antennas vary depending on several parameters used in their design, such as the "scale factor", etc. These parameters are important when trading off bandwidth versus gain. There is no unique set of dimensions for a log-periodic array. A good place to start researching log-periodic antenna designs is the ARRL Antenna Book (which has a chapter on log-periodic antennas). Some of the other antenna handbooks (Johnson/Jasik, Lo/Lee, etc.) have more detailed design information. Regards, Lee, WA8YBT/6 From Unknown Fri Jan 05 11:40:53 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Mon, 01 Jan 96 21:59:05 GMT Lines: 14 Message-ID: <820577250.20688@pinetree.microserve.com> References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4bc5vo$bvh@ixnews6.ix.netcom.com> <30E43ED4.5FD1@csg.mot.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Paul Moller wrote: >Black is usually achieved by adding carbon, which is lossy. Other colors >should be more friendly. PVC in itself is not bad, and certainly not as >lossy at hf as the rumor of years gone by has indicated. Paul, have you seen any numbers for this, or other comparative information? I'm one of those who has stayed away from PVC because of those rumors. Do you know if PVC is less lossy than the "bad" plastics like Nylon? 73, Jack WB3U From Unknown Fri Jan 05 11:40:54 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail From: mchasse@primenet.com Newsgroups: rec.radio.amateur.antenna Subject: Re: [Q] Homebrew Hardline? Date: 1 Jan 1996 22:10:03 -0700 Organization: Primenet Services for the Internet Lines: 13 Sender: root@primenet.com Message-ID: <4caenc$nrv@nnrp1.news.primenet.com> References: <4asvei$4fk@news1.inlink.com> <4bc60t$rgi@hpscit.sc.hp.com> <4bd9n2$6e9@news1.inlink.com> <4bml1c$c5i@duey.gte.net> Reply-To: mchasse@primenet.com X-Posted-By: ip182.fhu.primenet.com X-Newsreader: IBM NewsReader/2 v1.03 In <4bml1c$c5i@duey.gte.net>, "Adam G. Lottes" writes: >The formula from the ARRL Antenna Book is Z=276log2S/d where Z=line impedance , S=ceter to center >distance between conductors, and d=outer diameter of inner conductor in same units as S.For >example a 3/4 in copper pipe with a 5/16 inner conductor = ~ 51ohms. > >I just built the VHF directional coupler from the antenna book. Works great and the formula >verified their dimensios are correct. > >Don't think I'd want to try building 50ohm hardline though. Good luck on your project > >George NF9D > And the hardline is only 1.50 a foot, youll spend more then that on your beads From Unknown Fri Jan 05 11:40:55 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!ns1.iamerica.net!usenet From: Darrell Barabash Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Re: 90 ohm cable on 300 ohm antenna Date: Mon, 01 Jan 1996 23:25:57 -0600 Organization: iAmerica, Inc. Lines: 20 Message-ID: <30E8C1E5.7304@iamerica.net> References: <4beib0$892@concave.convex.com> NNTP-Posting-Host: iad_ppp0221.iamerica.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) To: Loren Coe Xref: news.epix.net rec.radio.amateur.homebrew:12491 rec.radio.amateur.antenna:18183 Loren Coe wrote: > > what determines the impedance of an antenna? is there anything i can do > to mitigate the need for a matching xfmr. > Virtually every physical aspect of an antenna affects its impedance. Generally , though, a yagi type antenna is designed with a dipole as the driven element. Y our antenna is 300 ohms because the driven element is (probably) a "folded dipole" . A folded dipole looks like a rather narrow an elongated rectangle. One property of a folded dipole is that the "folding" is usually designed to cause a 4:1 impedan ce increase. Thus, a dipole which is typically about 73 ohms is transformed to ab out 292 ohms (300 ohms effectively). Replacing the driven element with a conventional dipole is one way of avoiding the matching transformer. But, you should still use a 1:1 coaxial balun to convert from unbalanced to balanced. Darrell Grapevine, TX From Unknown Fri Jan 05 11:40:56 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!cygnus.com!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: 3/4 wave vertical on 20m ? Date: 2 Jan 1996 00:28:10 GMT Organization: ELNEC/EZNEC Software Lines: 24 Message-ID: <4c9u6q$2fr@maureen.teleport.com> References: <4c8uln$ck0@gateway.grumman.com> NNTP-Posting-Host: ip-pdx06-08.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) ; bat@gateway.grumman.com (Pat Masterson) writes: ; OK, its January now, so I'm beginning to think about ; Field Day antennas. Our club usually erects about 4 of those ; telescoping 50 foot poles in a straight line. One has a ; tribander on top, and all are used to hold up some 40m ; and 80m dipoles. I was thinking of using one of the poles as ; a 3/4 wave vertical on 20 meters, since 50 feet seems to be ; about the right number. We'll lay a bunch of radials on the ; ground, and go at it. Will this work OK? I assume the impedance ; should be near 50, but I'll use a tuner if necessary, ; because I wont be able to adjust the lenght at all. Any ideas? ; -pat The 3/4 wave vertical will have an impedance near 50 ohms when resonant, but the main radiation will be at an angle of 60 degrees above the horizon. This would be a poor antenna for anything but communicating with stations that are very close (say, up to a couple of hundred miles). You might think about making a J-pole out of it instead, or just hang a 20 meter dipole from the same feedpoint as the 40 or 80 meter dipole. 73, Roy Lewallen, W7EL From Unknown Fri Jan 05 11:40:58 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!ns1.iamerica.net!usenet From: Darrell Barabash Newsgroups: rec.radio.amateur.antenna Subject: Re: Why free space pathloss ? Date: Tue, 02 Jan 1996 00:48:58 -0600 Organization: iAmerica, Inc. Lines: 27 Message-ID: <30E8D55A.2391@iamerica.net> References: <4bp72a$5f4@hawk.pix.za> NNTP-Posting-Host: iad_ppp0215.iamerica.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) To: Danie Brynard Danie Brynard wrote: > > Why is the free space path loss different for different frequencies > ? Thus every time you double the frequency the pathloss increase by > 6dB. I know what the mathematical formulae say but can somebody > just give a plain gutfeel common sense answer for this dummy ? > Let me give it a shot... First, you should note that the "Power Density" at some distance, d, from the source is INDEPENDENT of frequency. PwrDensity(d) = TXPwr/(4*PI*d^2) I.e., this the TX power spread over the surface area of a sphere having a radius of d. The frequency dependence arises from the fact that the Gain of an aperture is frequency dependent. The larger it is, in wavelenghts, the higher the gain is. PwrGain = (4*PI*EffectiveArea)/(Lambda^2) I don't know if that helps or not, Danie. ...Darrell From Unknown Fri Jan 05 11:40:59 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: 2 Jan 1996 02:01:16 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 83 Sender: root@newsbf02.news.aol.com Message-ID: <4cal7s$ejo@newsbf02.news.aol.com> References: <30E84B87.5A86@arrl.org> X-Newsreader: AOL Offline Reader Hi Zak, I hope you had a nice holiday. Santa probably brought you lots of UHF gear? He dropped off some music type CD's and a book to read. In article <30E84B87.5A86@arrl.org>, Zack Lau writes: >Why do you think the ground losses are so important? Ground losses are very important at HF. If I was a skilled UHF op like you I wouldn't worry have the importance of reducing ground losses drummed into my head so well, but most of my time is spent on the other end of the spectrum. In particular they are important if the antenna is very spead out compared to it's height above ground. > People routinely get excellent results from dipoles that aren't very high, as long as >they use them for high angle paths. Even the performance of a dipole used for high angle communications can be substantially improved by a ground "mat" or counterpoise system below the antenna. This is also true for low angle communications, except ground losses a greater distance away will also detract from performance. Both increased height and a surface that improves conductivity can help a great amount. But in any event, the Rhombic is not a high angle radiator. A high angle dipole is probably not a good comparison to use. >I'd be more worried about optimizing the signal at the angles of radiation >that are best for the paths I'm trying to work, instead of worrying about a little bit of >ground loss. I probably didn't make my main point well enough. My point was the addition of extra length could do nothing meaningful if current (power) was not available at that distance from the feedpoint. I was repeating a comment that Kuechlen and others attributed this primarily to ground losses and radiation from the wire. They determined this from test range measurements. >The former can affect signals by 10s of dB, while the latter is undoubtedly in the single dB range. I don't have the exact figures, I think they are a little nebulous. Everything I've read and experienced indicates HF ground losses are more worrysome than a single dB. This would be especially true if the antenna was parallel with and very close to the earth. Wave angle is important, as you indicated. But, in the antenna being discussed, wave angle surely isn't modified by adding additional wire that has no or little current in it! >Having a steerable phased array would certainly be an advantage in reducing the >problem of pattern nulls. That's why SW BC stations favor those types of arrays. And also because the gain for a given physical size is much higher than obtainable in a long wire array of any type. >I wouldn't be surprised if an analysis of the W6A rhombic farm showed that too much >height reduced the signal at the optimum angles of radiation for some 20 meter >paths. The "problem" is the sloping terrain, which allow signals at very low angles of >radiation. I wouldn't know what that particular array actually did. But it is safe to say any array that has maximum *freespace* radiation concentrated in a narroe low angle lobe, like a 2 WL per leg Rhombic does, requires ground reflection not interfere with the main lobe focus. Simply lowering a Rhombic will reduce efficiency rather than modify the take-off angle. As far as the optimum angle of any signal, in Reference Data for Radio Engineers it's given as being between 2 and 25 degrees for 1000 mile paths, depending on the height of the reflecting layer used. It's below 15 degrees for paths longer than 1500 miles. A chart of a actual 2880 mile path shows the wave angle usually hovers in the 5 degree area, and only on one occasion on 5 MHz reached 15 degrees during a daylight path. I have a difficult time understaning how that applies to Kuechlen's statement that making a long wire array longer than 3.3 to 3.9 WL results in no additional gain, and can actually decrease it. His statement was losses were primarily due to the inability to force current out on the radiator, an From Unknown Fri Jan 05 11:41:00 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!oleane!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: n4jvp@ix.netcom.com (n4jvp) Newsgroups: rec.radio.amateur.antenna Subject: Re: Hustler 10-80 vertical Date: Tue, 02 Jan 1996 02:49:42 GMT Organization: Netcom Lines: 15 Message-ID: <30e89abf.825790@ixnews1.ix.netcom.com> References: <4c92ps$cl0@news.paonline.com> NNTP-Posting-Host: ix-nas-nh1-18.ix.netcom.com X-NETCOM-Date: Mon Jan 01 6:51:28 PM PST 1996 X-Newsreader: Forte Agent .99c/16.141 On 1 Jan 1996 16:40:28 GMT, VJKunesJr@spacetech.com wrote: >Anyone had any experience with these antennas? Haviing a hard time tuning it. Possibly could be because I'm next to a hill. Have >correct ground radials for each band(min of 4) so that shouldn't be a problem . Any advice would be appreciated. I have had two Hustler trap verticals, both all 5 band models. I had no problems with either assembly or tuning. I doubt that a hill would have that great an affect especially with a radial system installed. What problems are you having tuning yours? With out a few additional details all I can suggest is to walk through the assembly instructions and recheck all measurements, this is to make certain that it is assembled correctly. Check that the proper connections are made to the coaxial feed. From Unknown Fri Jan 05 11:41:01 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!charles1 From: charles1@netcom.com (charles copeland) Subject: Mobile HF antenna efficiency? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) Date: Tue, 2 Jan 1996 03:45:57 GMT Lines: 5 Sender: charles1@netcom14.netcom.com How efficient are mobile whip antennas compared to 1/2 wave dipole installed at ones house? 10% ? From Unknown Fri Jan 05 11:41:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!delmarva.com!udel!gatech!bloom-beacon.mit.edu!usc!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!news From: jhanson@yar.cs.wisc.edu (Jason Hanson) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc Subject: Indoor Antenna Help Date: Tue, 02 Jan 1996 04:04:24 GMT Organization: University of Wisconsin, Madison Lines: 18 Message-ID: <4cab0a$167a@news.doit.wisc.edu> Reply-To: jhanson@yar.cs.wisc.edu NNTP-Posting-Host: f180-047.net.wisc.edu Xref: news.epix.net rec.radio.amateur.antenna:18178 rec.radio.amateur.misc:96365 I have an Icom IC-730 with no tuner. I am trying to hook up some sort of antenna system to work in my apartment bedroom. I have purchased 100 ft of speaker wire, figuring I would be able to stretch it out and pick up something, but I can't get a thing! I can't even hear WWV for crying out loud. :) What should I do? The room is very small so I don't think I will be able to make much of a configuration on the ceiling. Am I doing something wrong with the wire? Would a tuner help? Can anyone direct me to an easy/small indoor antenna design on the web, or elsewhere? Thanks in advance! -- Jason J. Hanson | 641 W. Main St. #315 | (608) 251-0561 University of Wisconsin | Madison, WI 53703-4711 | Ham: N9LEA (Extra) -- jhanson@yar.cs.wisc.edu =*++*= Proud Democrat, Badger fan, speeder -- From Unknown Fri Jan 05 11:41:03 1996 Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in2.uu.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW From: sabinw@crpl.cedar-rapids.lib.ia.us Newsgroups: rec.radio.amateur.antenna Subject: fleas Date: 2 Jan 1996 04:51:38 GMT Organization: Cedar Rapids Public Library, Cedar Rapids, IA, 52401 Lines: 4 Distribution: world Message-ID: <4cadkq$i7a@flood.weeg.uiowa.edu> Reply-To: SABINW@crpl.cedar-rapids.lib.ia.us NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us I guess even among fleas, size is important. No flea should exaggerate his own stature or importance, relative to other fleas, because he may turn out to be less important than he thinks he is. From Unknown Fri Jan 05 11:41:04 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!uwm.edu!news.sol.net!daily-planet.execpc.com!usenet From: Rick McGaver Newsgroups: rec.radio.amateur.antenna Subject: Re: Hustler 10-80 vertical Date: 2 Jan 1996 05:43:15 GMT Organization: None Lines: 8 Message-ID: <4caglj$n69@daily-planet.execpc.com> References: <4c92ps$cl0@news.paonline.com> NNTP-Posting-Host: germansheprd.execpc.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: VJKunesJr@spacetech.com hi, have used the hustler 4btv & 5btv with and without radials. of course with it works better but i used it with my rv mounting on the ground or off the ladder on the motorhome. i worked plenty of dx although a single band quater wave would perform better .. in a horserace with a fellow ham n9au he had a mono band vetical ground plane and in prtable his dx signal reports were 1 -3 db higher using the radio. good luck rick nk 9g From Unknown Fri Jan 05 11:41:05 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.connect.com.au!news.syd.connect.com.au!news.bri.connect.com.au!soggy.eis.net.au!news From: carlo@eis.net.au (Carlo Hamalainen) Newsgroups: rec.radio.amateur.antenna Subject: Pointers on FM reception? Date: 2 Jan 1996 06:05:09 GMT Organization: eis.net - Brisbane - Australia Lines: 27 Message-ID: <4cahul$bhp@soggy.eis.net.au> NNTP-Posting-Host: dialup-6.eis.net.au Mime-Version: 1.0 X-Newsreader: WinVN 0.99.3 Hello everyone, I'll admit to being a complete dolt when it comes to electronics and radio sorts of things (my knowledge is in computer programming). I have a low end Sony stereo (with digital tuning). My problem is that my favourite radio station doesn't have a bilion watt transmitter, so I get crackle when i listen to it (mainly when people are talking, not so bad when music is playing). I've attached about 7 feet of insulated copper automotive wire to the antenna connection, and the crackle has subdued a bit. What else can I do? Would something simple like more wire do the trick? If anyone could point me in the right direction to improving FM reception I would be VERY grateful! BTW, when i was at my aunt's place which is geographically a lot closer to the radio station, reception was perfect even on my walkman (which usualy is a $#% to get a good signal). I guess this means that the problem definately is mine, not theirs. Much thanks in advance, -- carlo From Unknown Fri Jan 05 11:41:06 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: Tue, 02 Jan 1996 11:31:35 -0800 Organization: American Radio Relay League Lines: 24 Message-ID: <30E98817.242C@arrl.org> References: <30E84B87.5A86@arrl.org> <4cal7s$ejo@newsbf02.news.aol.com> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) To: W8JI Tom W8JI Tom wrote: > I wouldn't know what that particular array actually did. But it is safe to > say any array that has maximum *freespace* radiation concentrated in a > narroe low angle lobe, like a 2 WL per leg Rhombic does, requires ground > reflection not interfere with the main lobe focus. Simply lowering a > Rhombic will reduce efficiency rather than modify the take-off angle. I looked at the 3 wavelength/leg case on 20 meters. Page 13-11 of the ARRL Antenna book, 17th Edition. EZNEC seems to indicate that you can vary the take-off angle between 20 and 10 degrees, by increasing the height from a low 35 ft to 100 ft. The latter case has a deep null at 20 degrees, which hurts you on shorter paths. > > As far as the optimum angle of any signal, in Reference Data for Radio > Engineers it's given as being between 2 and 25 degrees for 1000 mile The difference in gain is about 2 dB--but this doesn't necessarily mean the efficiency is less. The pattern is spread out more, so you would expect less gain. I'm too lazy to do a pattern integration to estimate the actual loss in efficiency. Zack KH6CP/1 zlau@arrl.org From Unknown Fri Jan 05 11:41:07 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: 2 Jan 1996 13:23:44 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 24 Sender: root@newsbf02.news.aol.com Message-ID: <4cbt7g$q34@newsbf02.news.aol.com> References: <4cal7s$ejo@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Ooops, timed out. Anyway the current taper (power losses) was primarily due to the inability to force current out on the element as it was made longer. They attributed that to two major causes, ground effects from the loosy ground below the antenna and radiated power losses as the current moves out on the wire. That's why the section on long wire arrays recommended keeping any Rhombic or V beam at least 1/3 the leg length above earth in normal soil conditions at HF. I really have very little experience with V's and Rhombics. I've had a few V beams and two Inverted V antennas (which were half Rhomics turned on side, not a droopy dipole), so I know the amount of power that makes it to the far end of even a 2 WL antenna was three or four dB down from the feedpoint power. Plus I've measured current in some Beverages, and the power loss in ONE wavelength is over six dB. What little I have seen seems to confirm Kuechlens data. VOA also has curtains that fit inside a small area of the Rhomics. The small area curtains (dwarfed by the Rhombics) have much higher gain than their huge Rhombics. All these reasons make me believe stacked or phased arrays of Rhomics would be much better than simply making the Rhombic longer to obtain more gain. 73 Tom From Unknown Fri Jan 05 11:41:08 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!onlink3.onlink.net!usenet From: bennerr@onlink.net (Rudy Benner) Newsgroups: rec.radio.amateur.antenna Subject: Re: Satellite antennas and trees Date: Tue, 02 Jan 1996 14:30:22 GMT Organization: Not at all organized. Lines: 21 Message-ID: <4cbf74$9bj@onlink3.onlink.net> References: <4c9bbu$lqg@maureen.teleport.com> NNTP-Posting-Host: tmns1_onlink1.onlink.net X-Newsreader: Forte Free Agent 1.0.82 Trees make a considerable difference. Especially when they have foliage. Take the appropriate messages. GL "Mark G. Wiltrakis" wrote: >I'm in the process of putting together a satellite station. I >need some advice regarding location of antennas for 2M and 440: >I have several siting options on my property, each with >particular advantages and disadvantages. How important is >having a "clear shot" at the satellite from the antenna?? How >much of a factor on xmit/receive are trees in the near field, >or at a distance (>100 feet)??? >Thanks for your thoughts! >73, Mark N7MMQ Hillsboro, OR From Unknown Fri Jan 05 11:41:09 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!box185.ams.vt.edu!user From: pelt@vt.edu (Ranson J. Pelt) Newsgroups: rec.radio.amateur.antenna Subject: Small 40 Meter Yagi??? Date: Tue, 02 Jan 1996 16:22:05 -0500 Organization: Virginia Tech Lines: 12 Message-ID: NNTP-Posting-Host: box185.ams.vt.edu I've seen the HW-40, a helincally (sp?) shortened yagi. Can someone direct me to a small size 2-element yagi for 40 meters using loading coils??? Tnx for the help. 73 -- Ranson J. Pelt pelt@vt.edu QST de nz4i From Unknown Fri Jan 05 11:41:10 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!news.csug.rochester.edu!rit!sunsrvr6!jdc From: jdc@cci.com (James D. Cronin) Subject: Re: Which type of antenna for 77.5 kHz ? Message-ID: Sender: root@sunsrvr6.cci.com (Operator) Organization: Northern Telecom, Network Application Systems References: Date: Tue, 2 Jan 1996 17:21:04 GMT Lines: 18 In article , wrote: > >I want to build a receiver for the German time transmitter in Frankfurt which >operates at 77.5 kHz. > >Which type of antenna do I need ? > >Thanks for replying to this message !!! For MW/LW reception tuned loop antennas seem to be the way to go. You can go for an air-wound loop or use ferrite rods for something more compact. Either way it's easily built at low cost from junkbox parts. Check the rec.radio.shortwave FAQ for the National Radio Club address. They publish a number of really good pamphlets on loop antennas. 73..Jim N2VNO From Unknown Fri Jan 05 11:41:11 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: mvenable@aol.com (MVenable) Newsgroups: rec.radio.amateur.antenna Subject: Re: LEARNING CW Date: 2 Jan 1996 18:14:46 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 42 Sender: root@newsbf02.news.aol.com Message-ID: <4cce96$3k9@newsbf02.news.aol.com> References: <4b87ef$5p3@usenet.pa.dec.com> Reply-To: mvenable@aol.com (MVenable) NNTP-Posting-Host: newsbf02.mail.aol.com gary.rawson@mindless.org (GARY RAWSON) wrote: > Hello, I am N8VVD and currently have a NO CODE TECH license (I will > get flamed for this). I have a goal of gettin my General before > October 1996. I am wanting to do the Jamboree over the air contest > with my Cub Pack (I am currently a den leader). I bought Morse code > tapes from Radio Shack (the one with 4 tapes & goes to learning it > to 13 WPM). (Snip) Gary keep up the good work. It is normal (was for me, anyway) to "get worse" during the practice session. That is just because your attention drops as you get tired. Learning new stuff is work. You brain is trying to put all this new information together and it hurts sort of :) During the rest times in between, your subconscious puts the information together and programs your brain so it is a little easier next time. You will notice that the tapes recommend stopping for a couple of hours after 20 minutes or so. I found that I like Morse Academy (also shareware) better than Supermorse. It has a receiving game that sends characters at random which you have to recognize and type in. You can set the character speed, the word speed, the number of characters in a group, and the time of the game all separately. I set the character speed pretty high and slowly speed up the word speed. It also helped me to have 2 or 3 character groups. If you spend too much time on the first character you automatically miss the subsequent ones. Doing the above I was able to get 5 wpm and my Tech Plus in six weeks of not working very hard. Now I'm working on the General. This will take more concerted effort I'm sure. It is also a good idea (I've heard, I haven't done this yet) to make your own tapes either by computer or by recording W1AW. You will soon memorize the radio shack tapes. Good Luck. 73 de Mark Venable N1RSK From Unknown Fri Jan 05 11:41:12 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.rmii.com!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: mvenable@aol.com (MVenable) Newsgroups: rec.radio.amateur.antenna Subject: Re: NEED CHEAP, EFFECTIVE SW BAND ANTENNA Date: 2 Jan 1996 18:34:53 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 27 Sender: root@newsbf02.news.aol.com Message-ID: <4ccfet$42a@newsbf02.news.aol.com> References: <4bvm42$32p@kiwi.crown.net> Reply-To: mvenable@aol.com (MVenable) NNTP-Posting-Host: newsbf02.mail.aol.com turk@uwplatt.edu wrote: >I have an old Hallicrafters S-120 receiver that's a bit banged up, but still >works rather well. However, I would like to improve my reception by leaps and >bounds, especially at 5.065 MHz (WWCR out of Nashville). >I live in Platteville, Wisconsin, approximately 25 miles northeast of Dubuque, >Iowa. (sorry--don't have my lat and long handy) >By using ingenuity and cheeeeeeeeeeeeap materials (you tell me what), I bought a roll of insulated wire and just ran it out the window. I have 165 feet of wire run out from my SW8, through a second story window to a tree. It is probably too long but I have been too lazy to shorten it, make it into a dipole, put a matching network on it, or anything else that might improve it. The bottom line for me was any wire worked pretty well and it was really cheap. So try something (anything) and see what you get. You can also check out rec.radio.shortwave which has lots of threads on SWL antennas. Good Luck Mark Venable From Unknown Fri Jan 05 11:41:13 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr8ip25.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: Tue, 2 Jan 1996 19:48:29 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 18 Message-ID: References: <4cal7s$ejo@newsbf02.news.aol.com> <4cbt7g$q34@newsbf02.news.aol.com> NNTP-Posting-Host: usr8ip25.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4cbt7g$q34@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writ es: >From: w8jitom@aol.com (W8JI Tom) >Subject: Re: References re Stacked Rhombics >Date: 2 Jan 1996 13:23:44 -0500 [SNIP] >All these reasons make me believe stacked or phased arrays of Rhomics >would be much better than simply making the Rhombic longer to obtain more >gain. >73 Tom FWIW, I have in my hand a QSL from VK5MC for a two meter EME contact. For an antenna, he was using four stacked Rhombics 342' per leg which works out to about 50 wavelengths. I don't know how optimum this is, but it completed my 2M WAC :-)) 73, Wes From Unknown Fri Jan 05 11:41:14 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!slwork From: slwork@netcom.com (Steve Work) Subject: Re: PVC for Antennas Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) X-Newsreader: TIN [version 1.2 PL1] Date: Tue, 2 Jan 1996 21:00:18 GMT Lines: 25 Sender: slwork@netcom21.netcom.com Ian G3SEK (G3SEK@ifwtech.demon.co.uk) wrote: : : : : We have very little idea what is really in these plastics we call "PVC", : "Nylon" etc. From the polymer chemist's point of view, these hardware-store : materials are often seriously mis-labeled. They also contain a variety of : unspecified filler materials. : Put a sample in the microwave oven and try it, with a glass of water as a : "dummy load". If it doesn't get warm in the time it takes to boil the : water, you're in pretty good shape. : In our microwave oven, black "PVC" drainpipe and black "polyethylene" : antenna insulators remained as cool are the circulating air (my guesses at : the base materials, but they certainly were black!) while grey "PVC" became : quite hot. A large WW2-vintage ceramic coil former became noticeably warm. What frequencies does this matter at? I was trying to make a yagi for 100Mhz reception with white PVC as the boom and got some bizarre results. Like adding elements which gave clearly worse reception than just a dipole. Would it be better to just use wooden broomstick for the boom? Or something metal with only of the drive element insulated? I thought it didn't matter whether the boom was conductive or insulating so why would something "in between" matter? From Unknown Fri Jan 05 11:41:15 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!slwork From: slwork@netcom.com (Steve Work) Subject: Re: Pointers on FM reception? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) X-Newsreader: TIN [version 1.2 PL1] References: <4cahul$bhp@soggy.eis.net.au> Date: Tue, 2 Jan 1996 21:09:40 GMT Lines: 32 Sender: slwork@netcom21.netcom.com Carlo Hamalainen (carlo@eis.net.au) wrote: : Hello everyone, : I'll admit to being a complete dolt when it comes to electronics and radio : sorts of things (my knowledge is in computer programming). : I have a low end Sony stereo (with digital tuning). My problem is that my : favourite radio station doesn't have a bilion watt transmitter, so I get : crackle when i listen to it (mainly when people are talking, not so bad : when music is playing). : I've attached about 7 feet of insulated copper automotive wire to the : antenna connection, and the crackle has subdued a bit. : What else can I do? Would something simple like more wire do the trick? 7 feet is **not** what you want. Try a quarter wavelength (i.e. 31 inches/76cm). You might also try making a dipole by attaching two such pieces of wire to then end of a 75-ohm (cable-TV-type) coax, the whole length of this should be about 1.5m with the coax attached to the middle. Try it in a variety of orientations, including vertical. Dipoles of FM made of TV-type wire can often be bought quite cheaply, too. Another option would be to use a TV antenna. I don't know what TV frequencies ozzie uses but I would suspect that like most places the FM band is in the middle of TV frequencies. Aim the TV antenna at the station. You also might try to get a commercial FM antenna, the bigger the better. Be sure and get something directional, not "omnidirectional". A directional antenna is the only way to improve reception on faraway stations. From Unknown Fri Jan 05 11:41:17 1996 Path: news.epix.net!news.sprintlink.net!EU.net!Belgium.EU.net!news From: alcon.couvreur@pophost.eunet.be Newsgroups: rec.radio.amateur.antenna Subject: Re: Which type of antenna for 77.5 kHz ? Date: Tue, 02 Jan 96 21:10:52 PDT Organization: EUnet Belgium, Leuven, Belgium Lines: 29 Message-ID: References: <4c9eig$lsb@linet02.li.net> NNTP-Posting-Host: dialup24.antwerp.eunet.be Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In Article<4c9eig$lsb@linet02.li.net>, write: > Path: Belgium.EU.net!EU.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns > From: bbruhns@newshost.li.net (Bob Bruhns) > Newsgroups: rec.radio.amateur.antenna > Subject: Which type of antenna for 77.5 kHz ? > Date: 1 Jan 1996 20:01:19 GMT > Organization: LI Net (Long Island Network) > Lines: 23 > Message-ID: <4c9eig$lsb@linet02.li.net> > NNTP-Posting-Host: linet04.li.net > X-Newsreader: TIN [version 1.2 PL2] > > Bob Bruhns, WA3WDR, bbruhns@li.net Thanks for yout information. I think I'll stick to ferrite loopstick. ( I want to build a small clock unit all-in-one ) You have any ideas how to interface the antenna to an RF amplifier stage ? I want to build everything myself just to keep in touch with electronics. I'm just missing some knowledge on ferrite loopsticks. Any idea which chip makes a good AM demodulator ? Do I need a local oscillator ? Best regards, Erik From Unknown Fri Jan 05 11:41:18 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!ddsw1!news.mcs.net!indep1!clifto From: clifto@indep1.chi.il.us (Clifton T. Sharp) Subject: Weird antenna software? Message-ID: Organization: as little as possible Date: Tue, 2 Jan 1996 21:45:01 GMT Lines: 20 Is there any software out there that will take a description of a radiator, no matter how strange, and give an indication of performance? For example, I input a description of a goalpost, specify a feedpoint, and find out the impedance and pattern. It might sound like a strange thing to want, but I think it would help my understanding of antennas to play with something like that. Actually, every antenna design I've ever seen seems to me to be some topological variation of one of two shapes, and that pretty much stifles my imagination. Besides, after an acquaintance who studied EE-level antenna design told me about a slightly-modified yagi that had a sharp NULL in the front, it started me thinking about what neat things can happen when you "do it wrong". -- Cliff Sharp There are days when no matter which WA9PDM way you spit, it's upwind. clifto@indep1.chi.il.us --The First Law of Reality From Unknown Fri Jan 05 11:41:19 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!ub!eerie.acsu.buffalo.edu!news.kei.com!newsfeed.internetmci.com!in2.uu.net!holmes.sgate.com!jekyll.sgate.com!donovanf From: Frank Donovan Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: Tue, 2 Jan 1996 21:50:50 -0500 Organization: Southgate Internet Host Lines: 21 Message-ID: References: NNTP-Posting-Host: jekyll.sgate.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Probably the most well known reference on this topic is "Radio Antenna Engineering" by Edmund A Laport. Section 3.23.4 is titled: Rhombic Antenna Arrays 73! Frank W3LPL donovanf@sgate.com On Fri, 29 Dec 1995, George L. Hiscox wrote: > During the past few evenings I have been computer modeling some > rhombics using EZNEC. It occurred to me that there might be > something to be gained by stacking them as one might stack yagis. > I have checked the usual antenna references and have been unable > to locate any writings on stacked rhombics. > > If anyone out there knows of any references on the subject or has > any personal experience with feeding stacked rhombics I would > appreciate an email or a followup to this post. From Unknown Fri Jan 05 11:41:20 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uchinews!ncar!elroy.jpl.nasa.gov!swrinde!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: 3 Jan 1996 00:19:33 GMT Organization: ELNEC/EZNEC Software Lines: 15 Message-ID: <4cci2l$9tu@maureen.teleport.com> References: <385905236wnr@ifwtech.demon.co.uk> NNTP-Posting-Host: ip-pdx15-11.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > Ian G3SEK writes: >. . . > Put a sample in the microwave oven and try it, with a glass of water as a > "dummy load". If it doesn't get warm in the time it takes to boil the > water, you're in pretty good shape. >. . . Although the converse isn't necessarily true. If it does get warm, it might still be o.k. at HF. Roy Lewallen, W7EL From Unknown Fri Jan 05 11:41:21 1996 Path: news.epix.net!news.sprintlink.net!wizard.pn.com!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Pointers on FM reception? Date: 3 Jan 1996 00:23:06 GMT Organization: LI Net (Long Island Network) Lines: 6 Message-ID: <4cci9a$43i@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] Reception is always improved with an outside antenna. A simple roof or window mounted outdoor antenna oriented to favor the station, feeding 300 ohm twin lead or preferably coaxial TV line if the radio will accept it, would surely help. Bob Bruhns, WA3WDR, bbruhns@li.net From Unknown Fri Jan 05 11:41:22 1996 Path: news.epix.net!news.sprintlink.net!gryphon.phoenix.net!usenet From: realbill@phoenix.net (Bill Holbert Sr.) Newsgroups: rec.radio.amateur.antenna Subject: Re: 160 meter trap Date: Wed, 03 Jan 1996 01:14:30 GMT Organization: Phoenix Data Systems Lines: 26 Message-ID: <4cclf2$mot@gryphon.phoenix.net> References: <4cc9ie$lrb@news01.aud.alcatel.com> NNTP-Posting-Host: realbill.breh.phoenix.net X-Newsreader: Forte Free Agent 1.0.82 sander@aud.alcatel.com (dick sander) wrote: >Does anyone have a design for adding 160 meter traps to each leg of >an 80 meter inverted vee? I built and 80 m vee and it works pretty >good, so I though I'd add 160 m to it if I can find a construction >article/plans to add traps >73 Dick Sander - K5QY Dick I can provide you with design data for traps to use with the 80 m vee if you will provide me with some data about the vee. What is the resonant frequency of the current 80 m vee? What portion of 160 m do you want to operate? The data that I will provide is based on building traps out of PVC and the MINI-8 coax. I currently have these traps in my inverted vee but it is designed for the 40/80 m arangement but the computer program will design to any frequency you like. Let me know also what power you are interested in running on 160 meters. 73's, Bill Holbert, W5BBR From Unknown Fri Jan 05 11:41:24 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.gvn.net!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.antenna Subject: Re: Peer review Date: 3 Jan 1996 01:44:55 GMT Organization: Hewlett-Packard Lines: 19 Message-ID: <4ccn2n$n3n@hpscit.sc.hp.com> References: <4c9ik5$gs4@flood.weeg.uiowa.edu> NNTP-Posting-Host: hpscrj.scd.hp.com In article <4c9ik5$gs4@flood.weeg.uiowa.edu>, wrote: >I would like to make a few remarks about Peer Review. As an author of >very many technical articles, both Company in-house and published in >journals, both Amateur and Professional, and as Co-Editor (and I have just gotten involved in technical writing the last few years and have started running into a lot of the same things you were saying. I am relieved to find out that this is "normal" :-) I was beginning to wonder if there was something wrong with me. Thanks for sharing your experience with us. Later this year I am planning to submit my first peer reviewed paper, against the advice of many colleagues. After reading your essay, I am going to have a sense of humor about it and not get nervous about the process. As you say, it is an imperfect process. Rick Karlquist N6RK rkarlqu@scd.hp.com From Unknown Fri Jan 05 11:41:25 1996 Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet From: Hank Blackstock Newsgroups: rec.radio.amateur.antenna Subject: Re: Antenna Help? Date: 3 Jan 1996 03:35:52 GMT Organization: IONet Lines: 16 Message-ID: <4cctio$31p@ionews.ionet.net> References: NNTP-Posting-Host: osip38.ionet.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 32bit) To: geotek@bingsuns.cc.binghamton.edu tom wrote: I would prefer a smaller base or mid loaded coil >arrangment Small or base loaded is going to result in terrible results on the lower bands (40 or 80). For those bands you might as well have a dummy load if you are unwilling to use a large centerloaded antenna with a capacity hat mounted as high as possible. 20 meters up the differences become less. The best mounting system for a plastic vehicle is a trailer hitch mount. Check with Texas Bugcatcher (see ads in QST) for trailer hitch mounts. 73 Hank WA5JRH From Unknown Fri Jan 05 11:41:26 1996 Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: References re Stacked Rhombics Date: 3 Jan 1996 05:48:13 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 39 Sender: root@newsbf02.news.aol.com Message-ID: <4cdmtd$l0o@newsbf02.news.aol.com> References: <30E98817.242C@arrl.org> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Zak, In article <30E98817.242C@arrl.org>, Zack Lau writes: >I looked at the 3 wavelength/leg case on 20 meters. Page 13-11 >of the ARRL Antenna book, 17th Edition. EZNEC seems to >indicate that you can vary the take-off angle between 20 and 10 degrees, >by increasing the height from a low 35 ft to 100 ft. The latter case >has a deep null at 20 degrees, which hurts you on shorter paths. The charts and graphs in the Handbook are interesting, but I believe they do not fully account for less than perfect ground (in the reflection charts for horizontal antennas). It also appears the graphs in the Rhombic section do not deal with real world conditions which include losses in the conductors from radiation, coupling to the lossy earth below the antenna, and ohmic conductor losses. Correct me if I am wrong, but I believe those are all important considerations as the antenna is made lower or longer. I also am not sure as to the accuracy of a program like EZNEC for this application. Many of these programs have great flaws when modeling antennas over real earth. Maybe someone with insight of EZNEC's operation can help there. None of this changes the answer I was trying to give, and I'm very confident the answer is correct. That answer is "stacking or phasing Rhombics is probably a good way to go, because the current in any long wire element decreases as the wire is made longer--particulary if the wire is close to ground". The current taper is primarily due to ground coupled losses and radiated power losses, according Kuechlin, by actual measurements at a real test range. That effect is confirmed in many textbooks, as well as measured in arrays I have used. Only a fraction of the transmitter power is available at the termination of the antenna. My common sense tells me adding wire where there is little power remaining can do little except waste space and wire. 73 Tom From Unknown Fri Jan 05 11:41:28 1996 Path: news.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!panix!news.columbia.edu!sol.ctr.columbia.edu!news.ess.harris.com!su102w.ess.harris.com!harris.pander01 From: harris.pander01@ic1d.harris.com (Paul Anderson) Newsgroups: rec.radio.amateur.antenna Subject: Re: 160 meter trap Date: Wed, 3 Jan 1996 05:57:07 Organization: Harris Corporation, GCSD Lines: 17 Message-ID: References: <4cc9ie$lrb@news01.aud.alcatel.com> NNTP-Posting-Host: panderson2.ess.harris.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #6] >Does anyone have a design for adding 160 meter traps to each leg of >an 80 meter inverted vee? I built and 80 m vee and it works pretty >good, so I though I'd add 160 m to it if I can find a construction >article/plans to add traps You'd want "80 meter traps" -- resonant on 80 meters -- to convert an 80 meter dipole into an 80/160 trap dipole. Look for a pair of Barker & Williamson's (B&W) T-80's -- I think they're about $25/each. They come with plans to do just what you're considering. *********************************************************** *** Paul Anderson *** *** E-mail: pander01@harris.com *** *** Amateur Packet: AB4VA @ KD4WLE.#MLBFL.FL.USA.NA *** *********************************************************** From Unknown Fri Jan 05 11:41:29 1996 Path: news.epix.net!news.sprintlink.net!eskimo!guysmiley.blarg.net!news.kimbro.com!news.frugal.com!ip-175.frugal.com!user From: sfisher@frugal.com (Sterling Fisher) Newsgroups: rec.radio.amateur.antenna Subject: Re: 3/4 wave vertical on 20m ? Date: 3 Jan 1996 08:02:53 GMT Organization: Frugal Internet - Public access in Sumner, WA Lines: 25 Message-ID: References: <4c8uln$ck0@gateway.grumman.com> NNTP-Posting-Host: ip-175.frugal.com In article <4c8uln$ck0@gateway.grumman.com>, bat@gateway.grumman.com (Pat Masterson) wrote: > OK, its January now, so I'm beginning to think about > Field Day antennas. Our club usually erects about 4 of those > telescoping 50 foot poles in a straight line. One has a > tribander on top, and all are used to hold up some 40m > and 80m dipoles. I was thinking of using one of the poles as > a 3/4 wave vertical on 20 meters, since 50 feet seems to be > about the right number. We'll lay a bunch of radials on the > ground, and go at it. Will this work OK? I assume the impedance > should be near 50, but I'll use a tuner if necessary, > because I wont be able to adjust the lenght at all. Any ideas? > -pat And don't forget, any metal (like a beam) connected to the top of the mast will provide top loading and could change the resonant frequency significantly. Sterling Fisher, KD6Z -- Sterling Fisher Lynnwood, Washington sfisher@frugal.com From Unknown Fri Jan 05 11:41:31 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!news.tek.com!netman.ens.tek.com!not-for-mail From: terrybu@netman.ens.tek.com (Terry Burge) Newsgroups: rec.radio.amateur.antenna Subject: Re: Stupid transmission line Date: 3 Jan 1996 09:00:36 -0800 Organization: Tektronix, Inc., Beaverton, OR, USA Lines: 18 Distribution: world Message-ID: <4cecnk$t1k@netman.ens.tek.com> References: <30E508FF.610E@ping.be> <8B81376.02CF000416.uuout@cencore.com> NNTP-Posting-Host: netman.ens.tek.com In article <8B81376.02CF000416.uuout@cencore.com> forrest.gehrke@cencore.com ( FORREST GEHRKE) writes: > >HB> The books that I've read on transmission line theory talk about >HB> twin-lead, shielded twin-lead, coax & waveguides, but I've never >HB> seen anything about 'twisted pair'. Should I presume that twisted >HB> pair works the same way as twin-lead? I.e., the twist itself has no >HB> essential effect on the nature of the transmission line? Twisted pair as in phone drop wire is twisted to prevent RF from traveling on it. In other words, it has inductors every so often to block the RF. Wouldn't exactly work to well for feeding RF don't you think? Terry KI7M From Unknown Fri Jan 05 11:41:31 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: zaax@aol.com (ZaaX) Newsgroups: rec.radio.amateur.antenna Subject: Are Bilal Isotron antennas any good? Date: 3 Jan 1996 09:00:39 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 11 Sender: root@newsbf02.news.aol.com Message-ID: <4ce267$oqo@newsbf02.news.aol.com> Reply-To: zaax@aol.com (ZaaX) NNTP-Posting-Host: newsbf02.mail.aol.com I would like to hear from anyone that owns a Bilal Isotron antenna. How well does it work for you? Do you feel that it is a good value? Is there anything that you don't like about it? If you have one for 80 or 40 meter how well does it perform? Any help with this will be greatly appreciated. 73 Zack Schindler N8FNR From Unknown Fri Jan 05 11:41:33 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!in1.uu.net!sunrise.gv.ssi1.com!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Wed, 03 Jan 1996 10:49:25 GMT Organization: RST Engineering Lines: 69 Message-ID: <4ceesi$fae@hg.oro.net> References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 All I can do is comment on PVC, nylon, and the rest of the plastics after doing antenna design and consulting for over 30 years. I realize that's not very much time (if you are a tree) but I have done several hundred designs and prototypes, quite a few of which were done using plastic as the construction medium. Those of you who fly light aircraft probably recognize some of those designs. Anyway, I've used PVC plain old water pipe from below 30 MHz. to above 2 GHz. and if you allow a SLIGHT fudge factor for some minor dielectric foreshortening and a SLIGHT fudge factor for some minor dielectric losses, PVC is by far superior to anything else I've been able to get my hands on as a construction support for prototypes and one-off designs (like the ham antennas around the house). As a matter of fact, I've just completed the design on a series of VHF (100-200 MHz.) base loaded monopoles, which are notoriously "goosey" to local perturbations in the immediate vicinity of the elements. The antennas are hermetically sealed in 3/4" PVC schedule 80 water pipe and all that was required was about a 5% pruning factor (over and above the regular 3-8% w/l factor) for the PVC loading. Measurements relative to the same monopole in air showed less loss than I can measure with the HP/Tek antenna range that I do FCC measurements on (0.1 dB reliably is about the best I can guarantee). As to nylon being a bad actor, why do you suppose then that there is a mil spec and a commercial spec for coil forms built on a nylon-filled base and tube? Sorry, this one doesn't wash either. I am glad to see that somebody used the black ABS stuff and is reporting good results with it for coil forms. I've never used the black just because I suspicioned that anything black probably had dissolved carbon particles in it. Glad to know I can at least start messing around with it, as it is pretty stout stuff AND I can get diameters up to 6" in the form of sewer pipe. As an aside to particulate conductor matter in the mechanisms, I was once called upon to make some tests with HF/VHF/UHF antennas installed inside a thin plywood shell, then the thin wood covered with dacron, then the dacron impregnated with a paste (dope) made of solvent and aluminum powder (a Bellanca aircraft wooden wing). We thought the aluminum dope would play hell with the antennas. Not so. Once again, we set up two dipoles on the test range and put a wing in between them. Not a bit of loss. Put the antenna inside the wing. Couldn't tell the difference. Our guess was that the aluminum powder particles were each suspended in a small sphere of the solvent and couldn't make contact to form a continuous sheet. On the other side of that coin, we got reports that there was a German metallic paint that gave a gorgeous finish, but that antennas buried inside the foam wing of various homebuilt airplanes using this paint had the response of a piece of spaghetti inside a copper septic tank. I doesn't explains 'em, I just reports 'em. Finally, as to the grey stuff (flex conduit) in PVC, I've used it, but since the white stuff in the form of water pipe is cheaper, I've never had a reason to mess with it very much. Sorry, I don't buy the "microwave oven" test for goodness of a material except at 2.4 GHz. or so. Jim Jim Weir VP Engineering | "We seem to be standing on RST Engineering | the foreskin of technology." Grass Valley CA 95945 | (Gen. Chuck Yeager) voice/fax 916/272-1432 | rst-engr@oro.net AR Adv WB6BHI CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ From Unknown Fri Jan 05 11:41:34 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!news.internetMCI.com!newsfeed.internetmci.com!iglou!n4lq From: n4lq@iglou.iglou.com (Steve Ellington) Subject: Re: AH3 Long wire tuner at home? X-Nntp-Posting-Host: iglou Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services (1-800-436-4456) X-Newsreader: TIN [version 1.2 PL2] References: <4cdc7f$lef@news.zocalo.net> Date: Wed, 3 Jan 1996 13:16:37 GMT Lines: 20 Keep in mind that if you go the radial route, you will probably need a radial for each band and they need to be suspended above ground in order to maintain resonance, a real trip! Pun intended. you're better off with a balanced antenna plus it will take a lot less wire. : >>>> : I Use a similar AH2 with Random wire in the Attic. : Try two things. : 1. Add radials with at least one cut at 1/4 wave on each band you operate o n. (more is better) : 2. Place several Ferite RF absorbing blocks over the coax near the tuner to avoid RF comming : back on the outside of the coax. : 73 : Larry KJ6PJ -- Steve Ellington N4LQ@IGLOU.COM Louisville, Ky From Unknown Fri Jan 05 11:41:35 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!ender.techcenter.paccar.com!news From: kg7hq@paccar.com (Michael A. Sterba) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba array for 2 meters ? Date: 3 Jan 1996 14:50:20 GMT Organization: OES Skagit County WA. Lines: 17 Message-ID: <4ce53c$6t@ender.techcenter.paccar.com> References: NNTP-Posting-Host: kg7hq.paccar.com Mime-Version: 1.0 X-Newsreader: WinVN 0.99.4 Hello Mike, In article , slmusr03@MBnet.MB.CA says... >Has any one ever tried a sterba curtain (vertical polarization) for 2 meters ? >If so, please let me know about your experiences. Yes I have. I used it as a stationary beam for repeaters to my north when I wa s in San Diego. It worked like a dream for me. It was suspended off a poly rope betwwen a mast and a close tree. If you want a rotating beam, you might want to go with a quad of yagi though. I tried it do to being a family antenna. :) Have fun. -- "Handcrafted From The Finest ASCII" 73's de KG7HQ From Unknown Fri Jan 05 11:41:36 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uchinews!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.msfc.nasa.gov!news.redstone.army.mil!news From: Martin Soprano Newsgroups: rec.radio.amateur.antenna Subject: Round Robin (Twin Lead) Marconi Date: 3 Jan 1996 15:05:55 GMT Organization: RD-SE-EA Lines: 10 Message-ID: <4ce60j$b33@michp1.redstone.army.mil> NNTP-Posting-Host: 136.205.18.204 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.antenna Hello. Can anyone give me some construction advice on a Round Robin Marconi antenna. This is in regard to the December 95 article in "73 Amateur Radio Today". I've constructed this antenna, but may have made some incorrect assumptions (i.e. not inserting a 4:1 Balun and soldering the very end of the twin lead (450 ohm)). If anyone can help I would appreciate it. 73, KS4OI Martin From Unknown Fri Jan 05 11:41:37 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!nntphub.cb.att.com!ssbunews!not-for-mail From: loul@ihgp65r.ih.att.com (L.M.Leciejewski) Subject: Butternut HF6V Problem Message-ID: Sender: news@ssbunews.ih.att.com (Netnews Administration) Nntp-Posting-Host: ihgp65r.ih.att.com Organization: AT&T Distribution: usa Date: Wed, 3 Jan 1996 18:42:55 GMT Lines: 20 Hello, I have been using a Butternut HF6V Antenna with my Kenwood TS940S/AT for about 9 yrs now. Recently, on the 17 and 12 WARC Bands (I have the Butternut WARC Adap ter Kit) my SWR, after being tuned near 1.2:1, will jump intermittantly to over 3: 1 when transmitting USB. I took the antenna down last Fall and did a quick clean up but the problem still remains. Anyone else encounter this problem? Could this be a symptom of a bad capacitor on the HF6V (for the WARC Bands)? Thanks in advance for any help Lou WB9DKY -- ============================================================================== Louis Leciejewski - AT&T Bell Labs - loul@ihgp.ih.att.com - WB9DKY ============================================================================== From Unknown Fri Jan 05 11:41:38 1996 Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!fmsu03.fm.intel.com!mcd1.fm.intel.com!usenet From: "Ken (KC6TEU)" Newsgroups: rec.radio.amateur.antenna Subject: Re: Help Tuning 14AVQ Date: 3 Jan 1996 19:13:40 GMT Organization: Intel Corporation, Folsom CA, USA Lines: 30 Message-ID: <4cekh4$9cv@mcd1.fm.intel.com> References: <4cc60g$sjj@Titania.wintermute.co.uk> <30E9675E.472E@aol.com> NNTP-Posting-Host: kmasonpc.fm.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) Jeff Blumenfeld KB3DX wrote: >Dean - > >I have a Hustler 4BTV rather than a 14AVQ, but with virtually all >trap verticals, the order of tuning is the same. Start with the 10 >meter section, and tune by lengthening or shortening the tubing >?=====>below the first trap (lengthening makes the antenna resonant at a >higher frequency) to get it resonant on 10. Then tune for 15,<====??? >lengthening or shortening the tubing ABOVE the first trap (i.e., >DON'T TOUCH the length of the tubing used for 10 meters). Then so >on for 20 and then 40. Hope this helps > >Jeff KB3DX jeffreyblu@aol.comDean Last wrote: >> >> I need some help tuning my 14AVQ antenna. Please could someone tell me >> the order of tuning as per the manufacturers instructions. >> >> ------------------------------------ >> Dean Last GM4THP >> dlast@wintermute.co.uk >> -------------------------------------- Shortening makes the antenna resonant at a higher frequency!!! 73, Ken Mason KC6TEU CM98LQ From Unknown Fri Jan 05 11:41:39 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: 3/4 wave vertical on 20m ? Date: 3 Jan 1996 19:42:46 GMT Organization: Intel Corporation, Chandler, AZ Lines: 14 Distribution: world Message-ID: <4cem7m$10s4@chnews.ch.intel.com> References: <4c8uln$ck0@gateway.grumman.com> NNTP-Posting-Host: vegas.ch.intel.com In article <4c8uln$ck0@gateway.grumman.com>, Pat Masterson wrote: >... I was thinking of using one of the poles as >a 3/4 wave vertical on 20 meters, since 50 feet seems to be >about the right number. Hi Pat, 3/4 WL is not a good length for a 20m vertical since the radiation pattern is high angle. Above 5/8 WL, the pattern develops high angle lobes, not good for the high bands at the low of the sunspot cycle. High angle radiation is good for low band local coverage, however. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Fri Jan 05 11:41:40 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-center fed dipole? Date: 3 Jan 1996 20:06:13 GMT Organization: Intel Corporation, Chandler, AZ Lines: 19 Distribution: world Message-ID: <4cenjl$lnl@chnews.ch.intel.com> References: <4c2cso$8g7@news3.digex.net> NNTP-Posting-Host: vegas.ch.intel.com In article <4c2cso$8g7@news3.digex.net>, wrote: >I'm looking for a decent wire antenna I can use for 80 and 40m in my 130x40 c ity lot. Hi Eric, my 102 ft dipole fed with 300 ohm ladder-line is an efficient all- band HF antenna. On 80m, a parallel cap at about 38 feet kills the reflections and drops the impedance to a flat 300 ohms. On 40m, a 6 ft stub at the Xmtr end does the same thing. A 4:1 balun takes the impedance from 300 ohms to 75 ohms. I need no antenna tuner on any HF band. The balun sees nothing but 300 ohms resistive so is not bothered by reactance. Common mode currents don't bother it since it is a voltage balun. I think, after 8 years, I finally have a wire antenna with which I'm happy. I took a lesson from the techniques of the 1920's and 1930's when the average ham didn't have coax, oscilloscopes, network analyzers, etc. Most hams had access to a VTVM and a grid dip meter and that's all. And yet they loaded their antenna systems more efficiently than most modern day hams. I tried it and it worked great. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Fri Jan 05 11:41:41 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.mailorder.com!news.avatar.com!avatar.avatar.com!kory From: Kory Hamzeh Newsgroups: rec.radio.amateur.antenna Subject: Need some help Date: Wed, 3 Jan 1996 21:15:23 -0800 Organization: Avatar Consultants, Inc. Lines: 32 Message-ID: NNTP-Posting-Host: avatar.avatar.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Hi Everyone, I'm new to HF, so bear with me. I recently purchased and installed a GAP Titan DX on the root of my house. The roof is about 15 feet of of the ground, and the GAP is mounted about 3 feet off of the roof. Basically, I'm very disappointed with the antenna. I monitor the locate DX cluster and tune to the frequency once a dx spot is announced. I have yet to hear one of the DX stations of SSB. Occasionally I can here some CW stations. I have yet to have ANY QSOs on 80m and 40m. A couple on 20M and maybe a dozen on 17M. Enough whining.... What I like to know is: 1. Can I remove the counter poise on the gap and add a bunch of radials? Would this help? Or, 2. Should I dump the GAP and put up a inverted V style antenna on the roof like the G5RV? Are these dipoles directional or non-directional? Would these puppies outperfrom a vertical like the GAP titan. The center point would be about 25 feet off of the ground, and ends would be about 15. Any help or encouragement would be greatly appreciated. Thanks, Kory KE6VWO From Unknown Fri Jan 05 11:41:42 1996 Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna,sci.physics.electromag Subject: Re: Impedence of Twisted Pair, etc. Followup-To: rec.radio.amateur.antenna,sci.physics.electromag Date: 3 Jan 1996 21:52:43 GMT Organization: Hewlett Packard Corvallis Site Lines: 42 Message-ID: <4cetrb$k9m@hpcvsnz.cv.hp.com> References: <820635834.330@pinetree.microserve.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Xref: news.epix.net rec.radio.amateur.antenna:18237 sci.physics.electromag:7479 WB3U (jackl@pinetree.microserve.com) wrote: : hbaker@netcom.com (Henry Baker) wrote: : >Impedence in ohms @ 1-20 MHz 100 +- 15 ohms : >Mutual capacitance in pF/ft @ 1 kHz 14.0 pF/ft nominal : >Attenuation, dB/1000 ft. @ 1 MHz 6 dB max : > @ 4 MHz 12 dB max : > @ 10 MHz 20 dB max : > @ 16 MHz 25 dB max : > @ 20 MHz 30 dB max : > @ 100 MHz 67 dB max : Thanks for the info. Those are significant loss figures, at least : compared to ladder line and open wire. So much for that idea! :) A couple of notes: First, the figures Henry posted are for 1000 feet, so at 1.2dB/100 feet at 4MHz, that's not great, but at least isn't terrible. It's about the same as RG-58, and about what I'd expect for small conductor diameters! If you want low loss, plan on using large conductors and/or high impedance... and if you are operating at high impedance (large spacing), you better be careful about using good insulation. Second, generally in the HF region and well up into VHF and even UHF, loss for decent line is dominated by the resistance of the conductors. Because the resistance is determined by the conductor diamter and the skin effect (unless the conductors are _really_, _really_ small diameter!), the loss in dB will double for every multiplication by 4 of the operating frequency -- or more generally, will multiply by the square root of the frequency ratio. You can use this as a test to see if some other loss mechanism is overtaking the loss due to conductor resistance. For example in the table above, you'd expect the loss at 20MHz to be sqrt(20) or about 4.5 times the loss at 1MHz. It's a little more than that, but not grossly. And at 100MHz, you'd expect ten times the dB loss, and again, that's pretty close. So I'd conclude that this line really is made well enough that it could be used up to 100MHz, if you can stand the loss. -- Cheers, Tom tomb@lsid.hp.com From Unknown Fri Jan 05 11:41:43 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news.cerf.net!ni1.ni.net!xband.ni.net!user From: blanton@ni.net (J. L. Blanton) Newsgroups: rec.radio.amateur.antenna Subject: Re: Why free space pathloss ? Date: Wed, 03 Jan 1996 23:09:08 -0800 Organization: Network Intensive Lines: 24 Message-ID: References: <4bp72a$5f4@hawk.pix.za> <30E8D55A.2391@iamerica.net> NNTP-Posting-Host: xband.ni.net > Danie Brynard wrote: > > > > Why is the free space path loss different for different frequencies > > ? Thus every time you double the frequency the pathloss increase by > > 6dB. I know what the mathematical formulae say but can somebody > > just give a plain gutfeel common sense answer for this dummy ? I think the term 'path loss' is very misleading. Part of it (the frequency-independent part) is due to the power spreading out in space as it moves away from the transmitter. The other part, which varies with frequency, has more to do with the receiving antenna, as there seems to be an assumption of constant antenna gain versus frequency. That is, as the frequency increases the aperture area must be reduced to maintain a constant receive gain value. Reducing the capture area of the receive antenna reduces the power intercepted. This may lead to the higher 'path loss' figures at higher frequencies. To add further to the confusion, 'path loss' does NOT include absorption losses due to the propagation medium, which are often frequency-dependent. These losses must be accounted for separately. Regards, Lee, WA8YBT/6 From Unknown Fri Jan 05 11:41:45 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!NewsWatcher!user From: hbaker@netcom.com (Henry Baker) Subject: Re: Arrival angles Message-ID: Sender: hbaker@netcom15.netcom.com Organization: nil organization References: <4ceu31$90l@argentina.it.earthlink.net> Date: Wed, 3 Jan 1996 23:26:17 GMT Lines: 17 In article <4ceu31$90l@argentina.it.earthlink.net>, JLB@earthlink.net (Joe Bulger) wrote: > Does anyone know of an antenna that is used to measure arrival angles of > HF signals? I would like to be able to readout arrival angles of signals > on 160M. I hope you have a large lot... -- www/ftp directory: ftp://ftp.netcom.com/pub/hb/hbaker/home.html Copyright (c) 1996 by Henry G. Baker. All rights reserved. ** Warning: Due to its censorship, CompuServe and its subscribers ** ** are expressly prohibited from storing or copying this document ** ** in any form. ** From Unknown Fri Jan 05 11:41:46 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!sloth.swcp.com!usenet From: ab5p@swcp.com (Brett Coningham AB5P) Newsgroups: rec.radio.amateur.antenna Subject: Re: LPDA dimensions anyone? Date: Wed, 03 Jan 1996 23:53:03 GMT Organization: Southwest Cyberport Lines: 23 Message-ID: <4cf1gg$hkg@sloth.swcp.com> References: NNTP-Posting-Host: ppp39.swcp.com X-Newsreader: Forte Free Agent 1.0.82 will@epix.net wrote: >Anybody know the element dimensions for a 5-element 10/12/15/17/20m >Log Periodic Dipole Array. I have one but not too interested in climbing >the tower to measure right now - and I have a South American contact who >is eager to build one. >post or email to will@epix.net - KD3XR - W F Sill, Tunkhannock, PA >thanks I wrote a DOS program, based on the ARRL equations, to design LPDA's. Anyone can have a copy, FREE, by accessing this URL: http://www.swcp.com/~ab5p/software.htm Hope it helps. Brett ab5p@swcp.com Albuquerque Transmitter Hunting Homepage: http://www.swcp.com/~ab5p/foxhunt.html From Unknown Fri Jan 05 11:41:47 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!sloth.swcp.com!usenet From: ab5p@swcp.com (Brett Coningham AB5P) Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF Log Periodic Date: Wed, 03 Jan 1996 23:53:05 GMT Organization: Southwest Cyberport Lines: 22 Message-ID: <4cf1gi$hkg@sloth.swcp.com> References: NNTP-Posting-Host: ppp39.swcp.com X-Newsreader: Forte Free Agent 1.0.82 ke3mf@atc.ameritel.net (Glenn Thorn) wrote: >Has anyone seen, have, or heard of any plans for a VHF/UHF log >periodic? Any software? >Thanks, >de Glenn, KE3MF I wrote a DOS program based on the ARRL equations. Anyone can have a copy FREE by accessing this URL: http://www.swcp.com/~ab5p/software.htm I hope it helps. Brett ab5p@swcp.com Albuquerque Transmitter Hunting Homepage: http://www.swcp.com/~ab5p/foxhunt.html From Unknown Fri Jan 05 11:41:48 1996 Path: news.epix.net!news.sprintlink.net!hermes.is.co.za!news.pix.za!usenet From: pak02464@pixie.co.za (Paul Clifford) Newsgroups: rec.radio.amateur.antenna Subject: PC antenna prog? Date: Thu, 04 Jan 1996 00:39:16 GMT Organization: PiX - Proxima information X-change Lines: 14 Message-ID: <4cflpf$pnf@hawk.pix.za> NNTP-Posting-Host: net-10.pix.za X-Newsreader: Forte Free Agent 1.0.82 Can anyone recommend an antennea design program that is PC based and if so where can I find a copy. Perhaps you would be so kind as to attach it to an E-Mail message for me. Many thanks. All The Best, Paul Clifford paul.clifford@pixie.co.za paul.clifford@f68.n7101.z5.fidonet.org Music And Mail BBS (Fidonet 5:7101/68) From Unknown Fri Jan 05 11:41:49 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!miwok!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.av.qnet.com!ibbs!js From: js@ibbs.av.org (Jeff Stillinger) Subject: Re: best "penetrating oil"??? X-Newsreader: TIN [version 1.2 PL2] Organization: Coffee Radio Difference Committee Message-ID: References: <199512291451.HAA05126@Freenet.UCHSC.EDU> <820305122.6046@pinetree.microserve.com> Date: Thu, 4 Jan 1996 06:12:12 GMT Lines: 36 WB3U (jackl@pinetree.microserve.com) wrote: : aw638@Freenet.UCHSC.EDU (Louise Carkenord) wrote: : >I know there are some true "penetrants" out there.....something : >way beyond WD-40. What have you people had good success with?? : >Please be very specific. : Back when I was involved in auto racing, I probably tried everything : on the market at one time or another. In all honosty, I never found : anything that I thought actually did a better job than WD-40. Most : of it *said* it did, but you couldn't prove it by my results. : The real trick to disassembling stuck metal parts is to use a : combination of oil and heat. After letting the WD-40 soak in for a : day or so, a propane or acetylene torch can be used to heat the parts. : The expansion and contraction of the metal nearly always breaks the : two pieces apart with very little effort. Naturally, you have to use : the type of torch and the amount of heat that's appropriate for the : job. Tempered steel parts should be heated as little as possible, and : an acetylene torch should not be used on aluminum unless the item is : large and conducts the heat away very rapidly. : Best of luck in your project. : 73, : Jack WB3U Liquid Wrench works well. -- --------------------------------------------------------------------------- Jeff Stillinger - KB6IBB js@ibbs.av.org PSC Box 3429 js@red-eft.la.ca.us Edwards AFB, CA 93524 +1 805 258 7303 8N1 Flight Test Center, crashing aircraft so you don't have too. --------------------------------------------------------------------------- From Unknown Fri Jan 05 11:41:50 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Arrival angles Date: 4 Jan 1996 08:40:04 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 21 Sender: root@newsbf02.news.aol.com Message-ID: <4cglbk$m5r@newsbf02.news.aol.com> References: <4ceu31$90l@argentina.it.earthlink.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4ceu31$90l@argentina.it.earthlink.net>, JLB@earthlink.net (Joe Bulger) writes: > >Does anyone know of an antenna that is used to measure arrival angles of >HF signals? I would like to be able to readout arrival angles of signals >on 160M. > > > > Hi Joe, Try a loop or ferrite rod antenna. There are other antennas, but they are more complicated and larger. One other method is to stack two antennas vertically and adjust the phase difference between them to form a null. Or to build a complicated receiving system that measures the phase difference of the signals from the stacked antennas. 73 Tom From Unknown Fri Jan 05 11:41:51 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!feenix.metronet.com!news From: ken brookner Newsgroups: rec.radio.amateur.antenna Subject: 6 meter antennas ?? Date: Thu, 04 Jan 1996 09:22:56 -0600 Organization: Texas Metronet, Inc (login info (214/705-2901 - 817/571-0400)) Lines: 10 Message-ID: <30EBF0D0.77B4E982@metronet.com> NNTP-Posting-Host: fw16.metronet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4 (X11; I; Linux 1.2.13 i486) i've ordered up a ten-tec transverter to build and am now wondering what types of antennas are being used on 6 meters. i'd prefer to build something and i don't have room for a big yagi. suggestions? thanks! ken brookner, n5lpi kenb@metronet.com From Unknown Fri Jan 05 11:41:52 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!tank.news.pipex.net!pipex!oleane!in2p3.fr!swidir.switch.ch!serra.unipi.it!news From: Lapo Pieri Newsgroups: rec.radio.amateur.antenna Subject: Re: Which type of antenna for 77.5 kHz ? Date: 4 Jan 1996 10:27:04 GMT Organization: Universita' di Pisa Lines: 21 Message-ID: <4cga1o$lda@serra.unipi.it> References: NNTP-Posting-Host: embiolab.iroe.fi.cnr.it Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I use a 12cm long ferrite rod with a lot of AWG32 turn on it with a variable capacitor; this "antenna" is followed by an op-amp preamp (it use LM358) and than a VLF to 2m converter. In my QTH (JN53OT) I got S7 signal on my IC211. If I have sometime I can convert the schematic in electronic form. 73 de Lapo IK5NAX ------------------------------------------------------------------------- Lapo Pieri IK5NAX internet: icesb@iroe.fi.cnr.it @IROE-CNR (Italy) Phone: +39 55 4235 276 (IROE) packet: ik5nax@IW5AFK.ITOS.ITA.EU +39 55 410209 (home) [TCP/IP] 44.134.208.174 ------------------------------------------------------------------------- From Unknown Fri Jan 05 11:41:53 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.rtsg.mot.com!merlin!usenet From: Simon Saunders Newsgroups: rec.radio.amateur.antenna Subject: HB9CV Info Date: Thu, 04 Jan 1996 12:02:59 -0800 Organization: University of Surrey Lines: 4 Message-ID: <30EC3273.1CB8@ieee.org> NNTP-Posting-Host: pr205-014.ecid.cig.mot.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) Can anyone point me towards info on the HB9CV anywhere on the Net or elsewhere ? Reply by mail please. Simon Saunders, G6FNE From Unknown Fri Jan 05 11:41:53 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!chi-news.cic.net!newsfeed.internetmci.com!usenet From: dmenser@parrett.net (Drew) Newsgroups: rec.radio.amateur.antenna Subject: Re: Anyone seen radio.zip? Date: 4 Jan 1996 12:18:44 GMT Organization: Parrett Business Machines Lines: 28 Message-ID: <4cggj4$ev5@parrett.net> References: <4cdjio$f2v@soggy.eis.net.au> NNTP-Posting-Host: dialin4.parrett.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 In article <4cdjio$f2v@soggy.eis.net.au>, carlo@eis.net.au says... > >I'm not quite sure if it's been distributed around much, but I almost got >all of radio.zip off a net.friend tonite, and I really wanna get hold of >it! > >It was supposed to have instructions for making antennas out of stuff from >around the home, so it'd be cheap to put together a good antenna. > >Anyone got it? I think it's around 400K or so long. > >thanks, > >-- carlo > You might try one of these: ftp://ftp.netnet.net/pub/mirrors/truespace/incoming/radio.zip ftp://ftp.cc.utexas.edu/depts/lbj-cbg/radio.zip Drew -- ************************************************************ I have a quote in mind, I just can't remember how it goes... dmenser@parrett.net Drew Menser http://www.parrett.net/~dmenser Bridgman, Michigan USA ************************************************************ From Unknown Fri Jan 05 11:41:55 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Poor Stereo Reception Local? Date: 4 Jan 1996 12:50:42 GMT Organization: LI Net (Long Island Network) Lines: 13 Message-ID: <4cgif2$o3q@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] Uh, I just remembered that channel 13 does come from the World Trade Center. I suspect all TV stations around Manhattan come from there, but maybe not. It's also just possible that you are near communications radio transmitters, although I would expect them to drop off the air from time to time. But if you're near a whole nest of them, it might be the problem. You would then need an FM bandpass filter; I don't know who makes any, maybe Channel Master? I don't recall any in the Radio Shack catalog. Bob Bruhns, WA3WDR, bbruhns@li.net From Unknown Fri Jan 05 11:41:56 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: autoemail@webular.COM Newsgroups: rec.radio.amateur.antenna Subject: E-mail request Date: 4 Jan 96 13:12:07 GMT Organization: ucsd usenet gateway Lines: 47 Message-ID: <199601041312.FAA26131@vern.wsmith.com> Reply-To: autoemail@webular.com NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu From: Dale Green Webular Communications Chico, California I'd like to send you a brief message, about twice a week, about a category you have an interest in. The messages are brief and to the point: information about a product or service of outstanding value or interest to you. If you want to receive mail: DELETE THE CATEGORIES YOU DO NOT WANT AND E-MAIL BACK TO US. Leave the categories you do wish to receive. You may receive as many as you want. **************************************** Aircraft Automotive Boat and Yacht Computer, Technology Educational Employment, Jobs, Training Environmental Health Hobby Home electronics Homeowner Investing and Financial Music and Video Non Profit, Charitable Org. Pet and Animal Sports Vacation, Leisure, Travel ***************************************** If you do not want to receive these messages do nothing more. Do NOT return this mail and you will not receive E-mail. Please do not make comments on this page. It will be processed automatically and isn't read. However I would welcome your comments, send them to dgreen@webular.com Sincerely, President, Webular Communications From Unknown Fri Jan 05 11:41:57 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.telalink.net!uro!jackatak!root From: root@jackatak.theporch.com (Jack GF Hill) Subject: Re: Stupid transmission line Organization: Jack's Amazing CockRoach Capitalist Ventures Date: Thu, 4 Jan 1996 13:57:38 GMT Message-ID: References: <4cecnk$t1k@netman.ens.tek.com> Sender: bbs@nowhere.uucp (generalized bbs login) Lines: 34 terrybu@netman.ens.tek.com (Terry Burge) writes: > Twisted pair as in phone drop wire is twisted to prevent RF from > traveling on it. In other words, it has inductors every so often > to block the RF. Wouldn't exactly work to well for feeding RF don't > you think? Not exactly.... Actually, there are no "added" inductors, the *induced* RF is choked off by virtue of the twists... think about this for a moment: if the wires were flat, like standard modular cable (regular twin-lead) then RF *induced* on the wires would flow unimpeded. However, the twist places the inducted field across the opposite wire, by "re-inducing" the current in the opposing direction on the other wire. For signal injected at one end, there is no problem -- if there were, having a twist in ladderline woulkd render it worthless, and many folks put a half-twist in every foot and a half or two feet, to cancel out imbalances and induced currents... That is why twisted pair works for long runs of telephone and why flat cable is not a good choice for that application. At least that's how it looks from here! ;^) -- 73, Jack, W4PPT/M (75M SSB 2-letter WAS #1657/#1789 -- both from the mobile! ;^) +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ | Jack GF Hill |Voice: (615) 459-2636 - Ham Call: W4PPT | | P. O. Box 1685 |Modem: (615) 377-5980 - Bicycling and SCUBA Diving | | Brentwood, TN 37024|Fax: (615) 459-0038 - Life Member - ARRL | | root@jackatak.theporch.com - "Plus ca change, plus c'est la meme chose" | +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ From Unknown Fri Jan 05 11:41:58 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.telalink.net!uro!jackatak!root From: root@jackatak.theporch.com (Jack GF Hill) Subject: Re: Mobile HF antenna efficiency? Organization: Jack's Amazing CockRoach Capitalist Ventures Date: Thu, 4 Jan 1996 14:04:44 GMT Message-ID: References: <4cebog$ccs@alpha.nafb.trw.com> Sender: bbs@nowhere.uucp (generalized bbs login) Lines: 33 Wayne Price writes: > Are there "practical" equations for computing efficiency? I asked this > question before WRT calculating and measuring parameters on an OUTBACKER, > and there were mixed opinions. YES! The simplest form is: Efficiency = Rr/(Rr+Rg+Rl) where: Rr is radiation resistance (do *NOT* rely on the MFJ or Autek to give this to you with any semblance of accuracy... for 160M or 80M the Rr may be in 1/10 ohm! ;^) Rg is ground return resistance, horrible in mobile applications Rl is the actually resistance of the antenna system and loading components The efficiency then is the radiation resistance as a percent of total resistance in the system YMMV, especially in computing or measuring radiation resistance... Good Luck! ;^) -- 73, Jack, W4PPT/M (75M SSB 2-letter WAS #1657/#1789 -- both from the mobile! ;^) +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ | Jack GF Hill |Voice: (615) 459-2636 - Ham Call: W4PPT | | P. O. Box 1685 |Modem: (615) 377-5980 - Bicycling and SCUBA Diving | | Brentwood, TN 37024|Fax: (615) 459-0038 - Life Member - ARRL | | root@jackatak.theporch.com - "Plus ca change, plus c'est la meme chose" | +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ From Unknown Fri Jan 05 11:41:59 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!lll-winken.llnl.gov!overload.lbl.gov!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news.kei.com!sundog.tiac.net!usenet From: (Aqualung) Newsgroups: rec.radio.amateur.antenna Subject: Am inside metal building Date: 4 Jan 1996 14:34:51 GMT Organization: The Internet Access Company Lines: 6 Message-ID: <4cgoib$87q@sundog.tiac.net> Reply-To: kenny@add.com NNTP-Posting-Host: 198.70.42.180 X-Newsreader: WinVN 0.92.6+ I am using a small clock radio inside of a space building (metal building) and the reception on the station I'm trying to get is far less than clear. Are there any easy solutions?? Regards! Kenny From Unknown Fri Jan 05 11:42:00 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: lojack@ix.netcom.com Newsgroups: rec.radio.amateur.antenna Subject: G5RV Reviews? Date: Thu, 04 Jan 1996 16:14:54 GMT Organization: Netcom Lines: 8 Message-ID: <4cgjte$4vc@ixnews4.ix.netcom.com> NNTP-Posting-Host: ix-wp1-14.ix.netcom.com X-NETCOM-Date: Thu Jan 04 5:15:26 AM PST 1996 X-Newsreader: Forte Free Agent 1.0.82 I have just been give tne G5RV multi-band dipole as a Christmas gift. Any reviews on this antenna? Any hints? There's too much snow on the ground to hang it now...I'm dying to try it out. 73, DE WB5PBJ From Unknown Fri Jan 05 11:42:00 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!inet-nntp-gw-1.us.oracle.com!news From: Craig Kall Newsgroups: rec.radio.amateur.antenna Subject: Re: Attic TV Antenna Date: 4 Jan 1996 16:39:20 GMT Organization: Oracle Svenska AB Lines: 7 Message-ID: <4cgvrp$qjm@inet-nntp-gw-1.us.oracle.com> References: <4bsbpi$deo@brokaw.comm.mot.com> NNTP-Posting-Host: kentucky.se.oracle.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: choi@ssd.comm.mot.com I live on an island off the Swedish west coast. Put a tv antenna in the attic once but found it didn't give me the picture I wanted. I've got concrete roofing tiles which really reduce signal strength when they're wet. - Craig SM6JCD / WA4HNC From Unknown Fri Jan 05 11:42:02 1996 Path: news.epix.net!news.sprintlink.net!hookup!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!raven.cybercomm.net!richg From: richg@raven.cybercomm.net (Rich Griffiths) Newsgroups: rec.radio.amateur.antenna Subject: Re: Satellite antennas and trees Date: 4 Jan 1996 16:58:43 GMT Organization: CyberComm Online Services Lines: 20 Message-ID: <4ch103$al8@crow.cybercomm.net> References: <4c9bbu$lqg@maureen.teleport.com> NNTP-Posting-Host: raven.cybercomm.net X-Newsreader: TIN [version 1.2 PL2] Mark G. Wiltrakis (trackus@teleport.com) wrote: : I'm in the process of putting together a satellite station. I : need some advice regarding location of antennas for 2M and 440: : I have several siting options on my property, each with : particular advantages and disadvantages. How important is : having a "clear shot" at the satellite from the antenna?? How : much of a factor on xmit/receive are trees in the near field, : or at a distance (>100 feet)??? Trees make almost no difference at 146 MHz. I don't know about 440, but the attenuation by foliage goes up with frequency and is very high above 1 GHz. ------------------------------------------------------------------ Rich Griffiths | W2RG Monmouth County FN20wi Red Bank, New Jersey | richg@raven.cybercomm.net "It takes all the running you can do to keep in the same place." From Unknown Fri Jan 05 11:42:03 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!crl.dec.com!caen!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!van-bc!unixg.ubc.ca!atha!rwa From: rwa@cs.athabascau.ca (Ross Alexander) Newsgroups: rec.radio.amateur.antenna Subject: Re: Arrival angles Date: 4 Jan 1996 17:38:05 GMT Organization: Athabasca University Lines: 16 Message-ID: <4ch39t$hgk@aurora.cs.athabascau.ca> References: <4ceu31$90l@argentina.it.earthlink.net> NNTP-Posting-Host: aupair.cs.athabascau.ca X-Newsreader: NN version 6.5.0 #10 (NOV) hbaker@netcom.com (Henry Baker) writes: >In article <4ceu31$90l@argentina.it.earthlink.net>, JLB@earthlink.net (Joe >Bulger) wrote: >> Does anyone know of an antenna that is used to measure arrival angles of >> HF signals? I would like to be able to readout arrival angles of signals >> on 160M. >I hope you have a large lot... I have 75 acres. Please describe your technique. Ross ve6pdq -- Ross Alexander, ve6pdq -- (403) 675 6311 -- rwa@cs.athabascau.ca From Unknown Fri Jan 05 11:42:04 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!ts08-ind-20 From: mai@iquest.net (Patrick Croft) Subject: Re: Small 40 Meter Yagi??? X-Nntp-Posting-Host: ts08-ind-20.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: Date: Thu, 4 Jan 1996 18:11:21 GMT Lines: 19 pelt@vt.edu (Ranson J. Pelt) wrote: >I've seen the HW-40, a helincally (sp?) shortened yagi. Can someone >direct me to a small size 2-element yagi for 40 meters using loading >coils??? > >Tnx for the help. > >73 > >-- >Ranson J. Pelt >pelt@vt.edu >QST de nz4i Ranson, Suugest you consider the CushCraft 402CD. Much can be found regrading beefing up the mechancial end, and for what it is it's hard to beat. Having wound various types of coils and applying copper tape for 'shorties', I opt for modifiying a 'box' antenna. GL WB9IQI/Patrick From Unknown Fri Jan 05 11:42:05 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW From: sabinw@crpl.cedar-rapids.lib.ia.us Newsgroups: rec.radio.amateur.antenna Subject: David Stockton Date: 4 Jan 1996 18:18:36 GMT Organization: Cedar Rapids Public Library, Cedar Rapids, IA, 52401 Lines: 5 Distribution: world Message-ID: <4ch5ls$jr4@flood.weeg.uiowa.edu> Reply-To: SABINW@crpl.cedar-rapids.lib.ia.us NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us To David Stockton: Nice to hear your comments, David. I'm familiar with some of your writings. Keep up the good (excellent) work. From Unknown Fri Jan 05 11:42:06 1996 Path: news.epix.net!news.sprintlink.net!damage.usa1.net!news From: jswenson@usa1.com (jswenson@usa1.com) Newsgroups: rec.radio.amateur.antenna Subject: Equipment ground Date: 4 Jan 1996 18:29:10 GMT Organization: USAinternet, Inc. Lines: 8 Message-ID: <4ch69m$ais@damage.usa1.net> NNTP-Posting-Host: wmn2-78.usa1.com Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 I have a cold water pipe in the shack which goes straight down to the basement to the outside underground. The telco uses this for it's ground. Is it better to run a ground line to a rod which would be a longer run and end up being thinner cable than the pipe ? A friend say this is the way to go, I say the water pipe is fine. Remember this is not an antenna ground but rather for the equipment. What do you think ? From Unknown Fri Jan 05 11:42:07 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!iglou!not-for-mail From: n4lq@iglou.com (Steve Ellington) Subject: Re: B&W Antennas X-Nntp-Posting-Host: iglou Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services (1-800-436-4456) X-Newsreader: TIN [UNIX 1.3 950824BETA PL0] References: <4ch3pa$a7r@damage.usa1.net> Date: Thu, 4 Jan 1996 19:08:19 GMT Lines: 15 Yes. I had the 1.8 to 30 MC model. SWR was flat across the spectrum. Radiation was terrible. I don't recommend it. Jasper (jtier@voice.com) wrote: : Anyone have experience in using any of the B&W folded dipole : types of antennas ? They have different models for multi-band : use. Your comments on any model is appreciated. Jasper : -- Steve Ellington N4LQ@IGLOU.COM Louisville, Ky From Unknown Fri Jan 05 11:42:08 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 4 Jan 1996 19:18:00 GMT Organization: Intel Corporation, Chandler, AZ Lines: 27 Distribution: world Message-ID: <4ch958$gp9@chnews.ch.intel.com> References: <4c6i7c$olr@chnews.ch.intel.com> <820564809.13886@pinetree.microserve.com> NNTP-Posting-Host: vegas.ch.intel.com In article <820564809.13886@pinetree.microserve.com>, WB3U wrote: >Congratulations! Now you can share your stories of melted coax >and arc'd tuner parts with the rest of us victims. I love QRO!!! I've already smoked some 6kv disc ceramics. Looks like mica, door- knobs, or vacuum caps are the way to go with QRO. >I thought the SB-200/201 series used a toroidal pickup? No? It uses a small slotted line directional coupler. >... The 3:1 limitation >is the result of concerns for the increased voltage at the output >circuitry of the amplifier, not the matching range of the Pi. Let's say the amp has a 5k ohm output impedance and the pi-network matches that 5k ohm impedance. Does the voltage across the first cap increase as the load deviates up and down from 50 ohms? Or just as the load deviates up from 50 ohms? If you hang a 100 ohm dummy load on a properly tuned amp, there are no reflections, yet the SWR meter reads 2:1. Same for a 25 ohm dummy load. Does the output voltage increase in both these cases? I don't remember much about tubes - hard to get a million of them on a chip. :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Fri Jan 05 11:42:09 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!in2.uu.net!lsi.lsil.com!up10_75!mforbes From: mforbes@lsil.com (Mark Forbes) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: 4 Jan 1996 19:24:27 GMT Organization: LSI Logic Corporation Lines: 5 Distribution: world Message-ID: <4ch9hb$323@lsi.lsil.com> References: <820577250.20688@pinetree.microserve.com> Reply-To: mforbes@lsil.com NNTP-Posting-Host: 147.145.10.75 A quick and dirty way to check RF lossiness is to put a small portion of the m aterial in a microwave oven for, say, 30 seconds. Lossy material will heat up significantly, while more RF compatible material will remain cool. You'll find that ABS plastic (The black stuff) is less lossy at higher frequencies than P VC. As stated, PVC is perfectly acceptable at HF, but becomes more lossy at VH F and above. Mark Forbes, KC9C --- Mark Forbes ext. None From Unknown Fri Jan 05 11:42:10 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!usenet From: tom_boza@ccm.ch.intel.com Newsgroups: rec.radio.amateur.antenna Subject: Difference between Voltage & Current balums Date: 4 Jan 1996 19:55:57 GMT Organization: Intel Corporation, Chandler, AZ Lines: 7 Distribution: world Message-ID: <4chbcd$q57@chnews.ch.intel.com> NNTP-Posting-Host: tboza.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) What physically makes up the difference in determining if a torriod balum is a voltage and current type? Is it with the methode used in winding the wire/coax onto a torrid? If so, what are the two differnet methods? WB7ASR... From Unknown Fri Jan 05 11:42:11 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!bwoodsch.demon.co.uk From: Phil Marshall Newsgroups: rec.radio.amateur.antenna Subject: Noise rejection Date: Thu, 04 Jan 96 20:06:42 GMT Organization: beechwood Lines: 17 Message-ID: <820786002snz@bwoodsch.demon.co.uk> Reply-To: pm@bwoodsch.demon.co.uk X-NNTP-Posting-Host: bwoodsch.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: bwoodsch.demon.co.uk I am interested to know if there is a basic simple antenna type or technique which will improve the rejection of local man made noise. I have read that 1/4 wave verticles are poor in this respect but maybe this is due to their omnidirectional reception properties. Therefore, if this basic type is considered poor, is there a mechanism for noise rejection that I am not aware of. So far, I have tried random wire (unbalanced and via a step down transformer), dipoles, triangles and other loops. In every case the unbalanced random wire seems to be the most successful at rejecting various sources of noise which appear to be in my area and when present, which is often, plagues the entire HF bands from 1.8 to 30MHz. I have tried balanced feeds/baluns with the dipoles etc but this does not seem to improve the noise rejection. Can anyone please help or offer any theory on this subject ? -- Phil Marshall From Unknown Fri Jan 05 11:42:12 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!howland.reston.ans.net!ix.netcom.com!news3.noc.netcom.net!zdc!zippo!usenet From: "Jason R. Rieg" Subject: NEC4 Content-Type: text/plain; charset=us-ascii Sender: usenet@news.zippo.com Content-Transfer-Encoding: 7bit Nntp-Posting-Host: jrieg.bpd.harris.com Organization: Harris Corporation Message-ID: X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Mime-Version: 1.0 Date: Thu, 4 Jan 1996 20:18:20 GMT Lines: 11 Can anyone tell me how I can get my grubby little hands on a copy of NEC4? Thanks. -- | Jason Robert Rieg | "listen: there's a hell of a | ___ __o | | Antenna Electrical Engineer | good universe next door; | ___ _`\<,_ | | Harris Corp. / Broadcast Div. | let's go." | ___ (*)/ (*) | | jrieg@harris.com | - E.E. Cummings | ^^^^^^^^^^^^ | From Unknown Fri Jan 05 11:42:13 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!nntp-ucb.barrnet.net!cellnet.com!usenet From: Jim Newsgroups: rec.radio.amateur.antenna Subject: Re: 6 meter antennas ?? Date: 4 Jan 1996 20:43:26 GMT Organization: CellNet Lines: 48 Message-ID: <4che5f$gl9@mirrors.cellnet.com> References: <30EBF0D0.77B4E982@metronet.com> NNTP-Posting-Host: smoke-2.cellnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (Windows; U; 16bit) How about a single delta-loop? I built a 10-meter version for field day a few years ago using a triangle shape with two small aluminum tubes extending up and out from the feed point, connected by wire along the top. The whole thing mounted to a TV-style mast using a small 2x4 block of wood with tight-fitting 1/2" holes to hold the aluminum tubing and a U-bolt to secure the whole thing to the mast. _____________ <- wire screwed to top of both aluminum tubes \ / \ / \ / <- 1/2" aluminum tubing \ / \ / _\_/_ |_____| <- 2x4 wood block | | | | | | <- TV-style mast | | It wasn't very big, and a 6-meter version would be even smaller. I used a 1/4 -wave impedance tramsforming piece of 75-ohm RG-59 (since the loop has a nominal 100 -ohm impedance), but you could probably use any old 50-ohm coax and it would work j ust as well. Unfortunately, the band was pretty dead that field day. We worked all the loc al novices, and we got a little bit of short skip. But all in all, it seemed to work pretty well, for its size. Hope that helps. Cheers. Jim DeLoach, WU0I ken brookner wrote: >i've ordered up a ten-tec transverter to build and am now wondering what >types of antennas are being used on 6 meters. i'd prefer to build >something and i don't have room for a big yagi. > >suggestions? > >thanks! > >ken brookner, n5lpi >kenb@metronet.com From Unknown Fri Jan 05 11:42:15 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!harbinger.cc.monash.edu.au!lugb.latrobe.edu.au!ecsclfe From: ecsclfe@lux.latrobe.edu.au (ENRIQUEZ Luke) Newsgroups: rec.radio.amateur.antenna Subject: YAGI QUESTION : Changing Resonance.. Date: 5 Jan 1996 00:02:20 GMT Organization: La Trobe University Lines: 74 Message-ID: <4chpqc$gln@lugb.latrobe.edu.au> NNTP-Posting-Host: lux.latrobe.edu.au X-Newsreader: TIN [version 1.2 PL1] Howdy, I have a 2-meter beam, home made by someone (not by me). It has 5 elements (1 ref, 1 DE, 3 dir) and a gamma match. I am having VSWR problems above 146 Mhz. The antenna has a 1:1 VSWR at 144 Mhz. I do not know much about yagi antennas, but I want to have a VSWR of 1:1 at 147Mhz, not 144Mhz. I decided to ask a few people, and I got 3 different answers : 1.) Adjust the Gamma match. 2.) Make a new beam. 3.) Move the last director closer to the DE (by an inch or two). I then decided that I should simulate the yagi with a program. To get a better picture, I used two programs. YAGIMAX 3.11 and Yagi Optmizer. Yagi Optmizer Results : At 147 Mhz : Forward Gain : 8.56dBd F/B Backlobe : 20.11 dB Input Imped. : 24.1-j19.7 SWR : 1.04SWR This is before the gamma match. At 144 Mhz : Input Imped. : 25.2-j37.5 At 146 Mhz : Input Imped. : 24.5-j26.1 At 148 Mhz : Input Imped. : 23.9-j12.7 From Yagimax 3.0 : At 144 Mhz : Input. Imped. : 23.76-j16.24 At 146 Mhz : Input. Imped. : 23.76-j16.24 At 148 Mhz : Input. Imped. : 24.42-j0.68 Normalized Radiation Resistance at 145.00 Mhz is 45.96 Ohms " " " " 147.00 Mhz is 27.07 Ohms Here are my questions : Is it going to be too hard to make this beam VSWR 1:1 or close at 147 Mhz. As I said, people are telling me all different things but I've concluded all I need to do is adjust the gamma match. I have not tried to adjust or fiddle with the gamma match yet. Some people said if the beam was designed for 144Mhz then it would not be worth playing with the gamma match. From what I can see, the beam is not designed for 144 Mhz. I've concluded this since as the freq. increses, the reactance decreases. However, the Normalized radiation resistance tells me that the beam has been designed for 145 Mhz. Can someone please help me and explain to me, what I can do? Regards, Luke -- --------------------------------------------------------------------------- Luke Enriquez, Dept. Electronic Engineering. LaTrobe University, Aust. "Life is like a pubic hair on a toilet seat. Someone is bound to piss you off" ecsclfe@lux.latrobe.edu.au --------------------------------------------------------------------------- From Unknown Fri Jan 05 11:42:16 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!news.paonline.com!usenet From: VJKunesJr@spacetech.com Newsgroups: rec.radio.amateur.antenna Subject: Re: Equipment ground [sig.txt] (1/1) Date: 5 Jan 1996 04:53:34 GMT Organization: Pennsylvania Online [Usenet News Server for Hire] Lines: 10 Message-ID: <4ciase$7ii@news.paonline.com> References: <4ch69m$ais@damage.usa1.net> NNTP-Posting-Host: 206.25.244.98 X-Newsreader: SPRY News 3.03 (SPRY, Inc.) begin 644 SIG.TXT M(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C M(PT*5F5R;F]N($HN($MU;F5S+"!*"(- M"DUI9&1L97-E>"P@3ED@,30U,#<@("`H8G5T('1H97D@=V]N)W0@;&5T(&AI M;2$I#0IE;6%I;"!A="!V:FMU;F5S:G)` NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I would like to be on your list. Thank you de Aris-5B4JE From Unknown Fri Jan 05 11:42:18 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: Fri, 05 Jan 1996 06:13:35 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 70 Message-ID: <4cifk9$itt@news.azstarnet.com> References: <4c6i7c$olr@chnews.ch.intel.com> <820564809.13886@pinetree.microserve.com> <4ch958$gp9@chnews.ch.intel.com> NNTP-Posting-Host: usr3ip3.azstarnet.com X-Newsreader: Forte Free Agent 1.0.82 cmoore@vegas.ch.intel.com (Cecil A. Moore~) wrote: >In article <820564809.13886@pinetree.microserve.com>, >WB3U wrote: >>Congratulations! Now you can share your stories of melted coax >>and arc'd tuner parts with the rest of us victims. I love QRO!!! >I've already smoked some 6kv disc ceramics. Looks like mica, door- >knobs, or vacuum caps are the way to go with QRO. >>I thought the SB-200/201 series used a toroidal pickup? No? >It uses a small slotted line directional coupler. >>... The 3:1 limitation >>is the result of concerns for the increased voltage at the output >>circuitry of the amplifier, not the matching range of the Pi. >Let's say the amp has a 5k ohm output impedance and the pi-network >matches that 5k ohm impedance. Does the voltage across the first >cap increase as the load deviates up and down from 50 ohms? Or just >as the load deviates up from 50 ohms? If you hang a 100 ohm dummy >load on a properly tuned amp, there are no reflections, yet the >SWR meter reads 2:1. Same for a 25 ohm dummy load. Does the output >voltage increase in both these cases? I don't remember much about >tubes - hard to get a million of them on a chip. :-) Why don't you look at it this way: The function of the pi network is to take the impedance appearing at the output spigot and transform it to a load impedance into which the tube(s) can deliver the design power. (I will not rehash the conjugate match/dynamic operating Z argument here.) Simultaneously, the tank must have an operating (loaded) Q sufficiently high enough to maintain the "flywheel" effect, but not so high as to limit the efficiency from the loaded to unloaded Q ratio. Stray tube capacitance, etc. can put limits on realizable Q. If you plot a 3:1 SWR circle on a Smith chart, you can easily see that the value of the real (resistive) part of the load can range from 16.67 to 150 ohm. Knowing the specified output power (more-or-less) of the amplifier, the peak voltage across this resistance and hence across the output capacitor can be calculated. Obviously, the worst case is at 150 ohm, where if my math is correct, the peak voltage is 548 V at 1 KW output. If the load SWR is truely no greater than 3:1, then this is as bad as it gets. Similarly, if the input side of the network is capable of being adjusted such that it presents the desired resistive (or nearly so) value to the tube(s) then the voltage swing is again easily calculated. (Of course if you know the supply voltage, it's even easier.) Because the input capacitor is again in parallel with this equivalent resistance, its voltage is also known. Note too that this value is independant of the load Z. Thus, I would surmise that the 3:1 limitation is more a function of matching range than of voltage breakdown. The SWR metering circuit is calibrated at 50 ohm, so with a 100 ohm load it correctly displays a 2:1 SWR. Remember that inside the bridge, there is a short segment of 50 ohm line, (or some 50 ohm reference) so there is an internal mismatch. >73, Cecil, KG7BK, OOTC (not speaking for my employer) 73, Wes -- N7WS From Unknown Fri Jan 05 11:42:19 1996 Path: news.epix.net!peach.epix.net!will From: will@epix.net Newsgroups: rec.radio.amateur.antenna Subject: Re: G5RV Reviews? Date: Fri, 5 Jan 1996 08:52:30 -0500 Organization: epix.net Lines: 16 Message-ID: References: <4cgjte$4vc@ixnews4.ix.netcom.com> NNTP-Posting-Host: peach.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4cgjte$4vc@ixnews4.ix.netcom.com> On Thu, 4 Jan 1996 lojack@ix.netcom.com wrote: > I have just been give tne G5RV multi-band dipole as a Christmas gift. > Any reviews on this antenna? Any hints? There's too much snow on the > ground to hang it now...I'm dying to try it out. When I first got my ticket I worked the world with a G5RV and 100w. Good all-bander. I worked a VK7 one AM for 1/2 hour. A caution: the length and/or arrangement of coax feeder affects how well it will load up on different bands. (I assume you know a tuner is needed!) I now have a so-called double-size G5RV so I can work 160, but frankly my LPDA works so great I only use the wire below 20m. will@epix.net - KD3XR - W F Sill, Tunkhannock, PA From Unknown Tue Jan 09 18:19:58 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: stoskopf@tri.NET (Lawrence Stoskopf) Newsgroups: rec.radio.amateur.antenna Subject: "Doty" in new article Date: 9 Jan 96 13:45:57 GMT Organization: ucsd usenet gateway Lines: 53 Message-ID: <199601091344.HAA17524@tri.net> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Just got the Jan 96 Radio Communications (RSGB) and was suprised to see in Technical Topics (my favorite all time column) a lengthy review of VK1BRH's article in Amateur Radio (Australia), Short Vertical Antennas and Ground Systems. Hawker reproduces one of Doty's ground conductivity figures from QST. He also refers to an article I've filed away and nearly forgotten: Using Elevated Radials with Ground Mounted Towers by KB8I in Sept 91, pp 77-82 IEE Trans on Broadcasting. ".. it is possible to use four elevated radials together with a conventional ground-mounted, base-insulated tower for MF broadcasting purposes, and achieve the same level of performance which is normally obtained from a classic 120-buried-radial system." This from NEC simulation. Hawker, who has apparently been around for a long time, and as one of the RSGB ladies at Dayton shared with me last year, has a great fund of knowledge about ham radio, etc. adds: "George Brown, it needs to be stressed, was not adverse to elevated, artificial ground screen. He was, in fact, the inventor of the HF/VHF artificial ground-plane antenna. He once confessed to me over lunch that his original version used only two radials, but to satisfy early police-radio customers this was increased to four radials without significantly increasing radiation efficiency." (My comment...these were way up in the air) Back to the Australian's comments: "Do not place radials on or below the ground unless there is space for some 120 radials and the site has good ground conductivity;(with poor ground conductivity it is useful regularly to water the ground!" Hawker's final comments: "VK1BRH emphasises that simulated results are only as good as the computer program. However he considers that NEC-81 is good at modelling linear antennas close to lossy ground. It has been validated numerous times but, even so, it has failed even more times due to inappropriate use." My wish list: 1. A good review article going back to the original Brown articles. 2. A meta-analysis of data already published. (A technique in which you combine a whole batch of statistically insignificant data to hopefully make it statistically significant) 3. A rework of the Doty model with corrections and field strength measurement s. Meanwhile, thanks to those who have added much reasoned info to this forum. Lawrence E. Stoskopf, M.D. N0UU From Unknown Tue Jan 09 18:19:59 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!yrkpa.kias.com!usenet From: rgraham@yrkpa.kias.com (Richard L. Graham) Newsgroups: rec.radio.amateur.antenna Subject: "No Radial" Verticals? Date: Fri, 05 Jan 1996 23:01:41 GMT Organization: Keystone Information Access Systems Lines: 18 Message-ID: <4ckal8$7o2@yrkpa.kias.com> NNTP-Posting-Host: slip9.kias.com X-Newsreader: Forte Free Agent 1.0.82 Hello all: I am trying to do a comparison on the "No Radial"-type verticals. My situation is that I live in a row home with very little real estate. I am forbidden from the XYL to put a vertical with radials on the ground, etc., so my next best choice is to put something up on the roof. I presently have a 40m sloper and a Bilal 80m antenna, but the Bilal doesnt perform that well, IMHO. I am interested in getting on 80meters, so the R-5,R-7 antennas are out of the picture (Cushcraft, why dont you make an R-8! :) I am trying to compare GAP, Butternet, and the MFJ verticals. If any of you have any of these antennas, let me know how you like it and if you have any other suggestions, I'd appreciate it. 73 DE KA3ESA, Rick From Unknown Tue Jan 09 18:20:00 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!newsrelay.netins.net!news.netins.net!usenet From: crcarlson@netins.net Newsgroups: rec.radio.amateur.antenna Subject: Re: "No Radial" Verticals? Date: 6 Jan 1996 03:12:44 GMT Organization: INS Information Services, Des Moines, IA USA Lines: 32 Message-ID: <0099BF3B.368E3553@netins.net> References: <4ckal8$7o2@yrkpa.kias.com> Reply-To: crcarlson@netins.net NNTP-Posting-Host: ins.netins.net In article <4ckal8$7o2@yrkpa.kias.com>, rgraham@yrkpa.kias.com (Richard L. Gra ham) writes: >Hello all: > >I am trying to do a comparison on the "No Radial"-type verticals. My >situation is that I live in a row home with very little real estate. >I am forbidden from the XYL to put a vertical with radials on the >ground, etc., so my next best choice is to put something up on the >roof. I presently have a 40m sloper and a Bilal 80m antenna, but the >Bilal doesnt perform that well, IMHO. I am interested in getting on >80meters, so the R-5,R-7 antennas are out of the picture (Cushcraft, >why dont you make an R-8! :) > >I am trying to compare GAP, Butternet, and the MFJ verticals. If any >of you have any of these antennas, let me know how you like it and if >you have any other suggestions, I'd appreciate it. > >73 DE KA3ESA, Rick > > Rick: I have used a GAP Challenger for about 3+ years. (Its currently down since I j ust made a move to the country.) If you're looking for 80 meter work I don't think I'd recommend the GAP. I have not personally had any experience with the other GAP line but I haven't heard anything better than lukewarm comments about thier 80 mete r coverage. I had poor results using my antenna on 80. I did have good results w ith it on 40 and 20 and thats what's most GAP users have told me also. I worked a lot of Dx just in the last few years using 3 watts. I too couldn't get any radials out s o I was glad to have an antenna that worked anything! But on 80 its a dud.Maybe so meone who has used the TITAN or the VOYAGER could tell of thier experience. Mine was mechanically very sound in the face of lots of ice. If you can't get some radi als down you may want to consider your other options. Good luck! WB0FDJ From Unknown Tue Jan 09 18:20:01 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: hawley@aries.scs.uiuc.EDU (C. J. Hawley Jr.) Newsgroups: rec.radio.amateur.antenna Subject: (no subject) Date: 6 Jan 96 05:13:39 GMT Organization: University of Illinois, Urbana-Champaign Lines: 1 Message-ID: <30EE0503.F9@aries.scs.uiuc.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu add hawley@aries.scs.uiuc.edu Chuck From Unknown Tue Jan 09 18:20:02 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: Bud Simmons Newsgroups: rec.radio.amateur.antenna Subject: (no subject) Date: 8 Jan 1996 16:10:04 GMT Organization: LATG DSE Lines: 4 Message-ID: <4crfks$b0q@newsgate.sps.mot.com> NNTP-Posting-Host: simmonsmac.sps.mot.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:rec.radio.amateur.antenna Does anyone have any experience with the MFJ multi-band hf antennas? Good or bad? From Unknown Tue Jan 09 18:20:03 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: /PN=Scott.C.Werling/O=wallace/PRMD=iadps/ADMD=attmail/C=us/@safe.ia.GOV Newsgroups: rec.radio.amateur.antenna Subject: (none) Date: 8 Jan 96 16:55:23 GMT Organization: ucsd usenet gateway Lines: 37 Message-ID: <199601081655.KAA08113@outpost.safe.ia.gov> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu >From /PN=Scott.C.Werling/O=wallace/PRMD=iadps/ADMD=attmail/C=us/ Mon Jan 8 11 :00:50 CST 1996 remote from osiint.safe.ia.gov Date: 08 Jan 1996 10:56:55 -0600 X400-Trace: US*ATTMAIL*IADPS arrival 08 Jan 1996 10:56:55 -0600 action Relayed From: /PN=Scott.C.Werling/O=wallace/PRMD=iadps/ADMD=attmail/C=us/@osiint.safe. ia.gov To: "/RFC-822=Ham-Ant(a)UCSD.EDU/OU=OSI-INTERNET/O=WALLACE/PRMD=IADPS/ADMD=ATT MAIL/C=US/"@osiint.safe.ia.gov In-Reply-To: <"\"/RFC-822=199601061230.EAA24761(a)mail.ucsd.edu/OU=OSI-INTERNE T/O=WALLACE/PRMD=IADPS/ADMD=ATTMAIL/C=US/\""@osiint.safe.ia.gov> Subject: Re: Ham-Ant Digest V95 6658 Importance: normal Autoforwarded: FALSE Message-Id: P1-Message-Id: US*ATTMAIL*IADPS;IDPS3550 werl0108105645aa UA-Content-Id: werl0108105645aa P1-Content-Type: P2 Priority: normal Received: from osiint.safe.ia.gov by iadpshub.safe.ia.gov; Mon, 8 Jan 1996 11 :00 CST Content-Type: text Content-Length: 690 > Those antennas don't perform particularly well on 15/10M. Are you > using a balun where the coax connects to the ladder line? > > 73, > Jack WB3U > Hi Jack, being new to building antennas and HF so this has been a real learning experience for me. I don't have a balun in my line. Should I have one there? If so is there any specific kind I should use or look for? Is it something I could build or should I go with a store bought unit? My tech expertise is very limited. My antenna SEEMS to do pretty well on 10/15. Made a 15 m contact on CW Iowa to San Diego CA. But maybe the band was open. Any help appreciated. Scott werling@safe.ia.gov From Unknown Tue Jan 09 18:20:04 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!uhog.mit.edu!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!s169.phxslip4.indirect.com!user From: emeb@indirect.com (Eric Brombaugh) Newsgroups: rec.radio.amateur.antenna Subject: 2-meter Log-Periodics - Why not a TV antenna? Date: Sat, 06 Jan 1996 21:11:12 -0700 Organization: Internet Direct, Inc. Lines: 29 Message-ID: NNTP-Posting-Host: s169.phxslip4.indirect.com Okay, I've got on my asbestos underwear. Why not use a TV antenna for 2-meters? Most conventional TV antennas are Log-Periodic designs that cover both the VHF and UHF bands. VHF TV being from 54 MHz to above 170 MHz, the 2-meter band seems to fall right into that range. Granted: TV antennas are much broader band than you really need for 2-meters, so you might be able to get better performance from a design just for Ham use. and TV systems are usually 75 ohm, not 50. But: TV antennas can be had very cheap. and 75 ohms into a 50 ohm system is only a 1.5:1 VSWR - not bad really. So - why not? Eric Brombaugh KC7GXA ericb@sicom.com (work) emeb@indirect.com (home) -- Eric Brombaugh KC7GXA emeb@indirect.com (home) ericb@sicom.com (work) From Unknown Tue Jan 09 18:20:05 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!news.cerf.net!ni1.ni.net!xband.ni.net!user From: blanton@ni.net (J. L. Blanton) Newsgroups: rec.radio.amateur.antenna Subject: Re: 2-meter Log-Periodics - Why not a TV antenna? Date: Sun, 07 Jan 1996 10:45:32 -0800 Organization: Network Intensive Lines: 15 Message-ID: References: NNTP-Posting-Host: xband.ni.net > In article emeb@indirect.com (Eric Brombaugh) writes: > >Why not use a TV type (Log Periodic) Antenna for 2m? VHF TV is divided into two bands: 54-88 MHz (channels 2-6) and 174-216 MHz (channels 7-13). Some TV antennas utilize dedicated (sometimes interleaved) log-periodic structures for the separate bands. Sometimes a log periodic structure is designed for the lower band and used in its 3rd harmonic mode on the upper band. It is not a given that a TV antenna will provide coverage of the 144-148 MHz band. Some designs may provide marginally acceptable performance while others may not. If you try using a TV antenna for 2m remember that most TV antennas hav a feedpoint impedance of 200-300 ohms and require a 4-to-1 balun to get to 75 ohms. Lee, WA8YBT From Unknown Tue Jan 09 18:20:07 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netcom.com!ghiscox From: ghiscox@netcom.com (George L. Hiscox) Subject: Re: Antenna Simulation Software Message-ID: Sender: ghiscox@netcom16.netcom.com Organization: NETCOM On-line Communication Services (408 261-4700 guest) X-Newsreader: Forte Free Agent 1.0.82 References: Date: Sun, 7 Jan 1996 01:48:31 GMT Lines: 31 cheungw@solomon.sce.carleton.ca (Wendy Wing Chi Cheung) wrote: >Hi! > I have a question about antenna simulation programs in >general. Does anyone here collect information about most of the >antenna simulation programs that exist? Wendy, I went through such a survey this past summer when selecting antenna modeling software for my personal use. I settled upon the EZNEC software written by Roy Lewallen, W7EL, based upon the response I got from my survey here on the Internet. EZNEC is based on NEC-2, as is the antenna modeling software by Brian Beezley, K6STI. Comments from those responding to the survey indicated that EZNEC was much more user friendly and that the customers of the EZNEC/W7EL software received better support from the author. I have found EZNEC to be very flexible and easy to use. The manual is very well written and easy to follow. I recommend it to you without reservation. George | George L. Hiscox | When I die I want to go quietly in | | ghiscox@netcom.com | my sleep like my grandfather, not | | WA6RIK @ WB6YMH | screaming like the people in his car.| From Unknown Tue Jan 09 18:20:08 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.interlog.com!winternet.com!news From: sholisky Newsgroups: rec.radio.amateur.antenna Subject: Re: Attic TV Antenna Date: 6 Jan 1996 05:45:35 GMT Organization: StarNet Communications, Inc Lines: 14 Message-ID: <4cl29v$o37@blackice.winternet.com> References: <4bsbpi$deo@brokaw.comm.mot.com> <4cgvrp$qjm@inet-nntp-gw-1.us.oracle.com> NNTP-Posting-Host: ppp-67-7.dialup.winternet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; 68K) To: ckall@se.oracle.com X-URL: news:4cgvrp$qjm@inet-nntp-gw-1.us.oracle.com Craig - One of my duties at the local public tv station is to answer questions like yours. True enuff a attic antenna is free from some of the effects of weather, but is subject to sever mistuning by way of the many things that are close to it. ( wires, building material,etc...) The advice I give to most all viewers is to put the antenna "on the roof". This may mean a simple installation, but most of all, a location that is in the free and clear of obsticals. Coax and a good tape job are in order as well. Regards - Scott WB0ATR Ps - you might wanna check out "ktca.org" for a few more hints. From Unknown Tue Jan 09 18:20:09 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: 100407.3136@compuserve.com (Alberto Perello) Newsgroups: rec.radio.amateur.antenna Subject: BALUN TELREX Date: Tue, 09 Jan 1996 19:26:25 GMT Organization: CompuServe Incorporated Lines: 13 Message-ID: <4cufg2$1pn@dub-news-svc-1.compuserve.com> NNTP-Posting-Host: ad51-208.compuserve.com X-Newsreader: Forte Free Agent 1.0.82 Hello to all, Any know where I can find the old bud good coaxial balun of Telrex 4K81B?. Or similar?. Thank you in advance. Alberto Perello - Barcelona/Spain EA3CR From Unknown Tue Jan 09 18:20:10 1996 Path: news.epix.net!news.sprintlink.net!news.wwa.com!buffnet2.buffnet.net!usenet From: daveb@buffnet.net (david james) Newsgroups: rec.radio.amateur.antenna Subject: Re: best "penetrating oil"??? Date: 9 Jan 1996 00:32:43 GMT Organization: BuffNET Lines: 5 Message-ID: <4csd3b$57p@buffnet2.buffnet.net> References: <4ck22d$hm2@news.paonline.com> NNTP-Posting-Host: fppp5.buffnet.net X-Newsreader: WinVN 0.92.2 In article <4ck22d$hm2@news.paonline.com>, VJKunesJr@spacetech.com says: > >>AeroKroil is a good product. I use just plain Kroil and it is the best I hav e ever found. Order it by the gallon. > Great .. So where do you get some ? From Unknown Tue Jan 09 18:20:11 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in2.uu.net!in-news.erinet.com!ragnarok.oar.net!malgudi.oar.net!news.rcinet.com!sally.dma.org!millersg From: millersg@dma.org (Steve Miller) Newsgroups: rec.radio.amateur.antenna Subject: Re: Butternut 80/40 Vertical Any Good? Date: 9 Jan 1996 17:49:51 GMT Organization: Dayton Microcomputer Association; Dayton, Ohio, USA Lines: 20 Message-ID: <4cu9rv$6ve@sally.dma.org> References: <4c9df2$t94@newsbf02.news.aol.com> <9601051635.AA28206@mac78.franklin> NNTP-Posting-Host: dmapub.dma.org In article <9601051635.AA28206@mac78.franklin>, Nelson P. Moyer wrote: >I have the HF2V mounted on the ground with an 8 ft. ground rod but no radials . >It's not the best setup but I've worked DXCC on 40 and 80 with it from Iowa. >It's a bit noisy in town, especially on 80. The bandwidth on 80 is only about >50 MHz but the coil is easy to adjust and I have marked the settings for phon e >and cw DX frequencies for rapid changes. The bottom insulator wears and has t o >be replaced in windy areas if you don't guy the antenna. I've replaced mine >every 3-4 years. I like the HF2V better than the 5 to 8 band verticals that >cover 40 and 80. I've used the HF6V and the old HyGain AVQ verticals. If you >don't have room for a proper antenna on 40 or 80, the HF2V is the way to go. > >KU0A You'll be much happier using the HF2V with radials!!! -- Steve Miller WD8IXE millersg@dma.org From Unknown Tue Jan 09 18:20:11 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!homer.alpha.net!usenet From: cardman@newrock.com Newsgroups: rec.radio.amateur.antenna Subject: Diawa Rotor Date: 8 Jan 1996 20:42:05 GMT Organization: Alpha.net -- Milwaukee, WI Lines: 5 Message-ID: <4crvit$mac@homer.alpha.net> NNTP-Posting-Host: port07.cornet.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) A friend of mine has a Diawa Rotorwhich was struck indirectly by lightning. The model number of the rotor is MR-750PE and the controller model is CR-4P. He is looking for a schematic for the controller or is looking to purchase a controller . If anyone has any info on this rotor please let me know at Cardman@newrock.Com . Any help would be appreciated as this seems to be a very limited item..73 ..K en NO9F From Unknown Tue Jan 09 18:20:13 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Difference between Voltage & Current balums Date: 5 Jan 1996 09:30:42 GMT Organization: ELNEC/EZNEC Software Lines: 19 Message-ID: <4cir42$rqu@maureen.teleport.com> References: <4chbcd$q57@chnews.ch.intel.com> NNTP-Posting-Host: ip-pdx02-19.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > tom_boza@ccm.ch.intel.com writes: > What physically makes up the difference in determining if a torriod > balum is a voltage and current type? Is it with the methode used in > winding the wire/coax onto a torrid? If so, what are the two differnet > methods? > > WB7ASR... It's kind of hard to describe without pictures. A 1:1 current balun has only two windings and will show a D.C. open at the input if the output is open. A 1:1 voltage balun has three windings and will show a D.C. short at the input if the output is open. A 4:1 current balun has two windings on each of two cores. A 4:1 voltage balun has three windings on a single core. The differences in what they actually do are explained in "Baluns: What They Do and How They Do It" in the ARRL Antenna Compendium, Vol. 1. Roy Lewallen, W7EL From Unknown Tue Jan 09 18:20:14 1996 Path: news.epix.net!news.sprintlink.net!hookup!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Doty article once ag˙˙˙˙˙ Date: 6 Jan 1996 07:08:55 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 26 Sender: root@newsbf02.news.aol.com Message-ID: <4cloon$ld5@newsbf02.news.aol.com> References: <30ed7d5e.1438317@137.149.3.1> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <30ed7d5e.1438317@137.149.3.1>, seeler@upei.ca (David C. Seeler) writes: >True - but if the article claims to make a significant advance as >opposed to being a "new vertical antenna " construction article, >external review might be considered. The delay may be worth it, if >accuracy is established. In my field, it is not uncommon for it to >take up to 1 year to be published once the paper is submitted. That, >I do not like, but given the alternative, I guess I accept it at this >time. On the other hand, if editors are concerned about getting papers >into the journal - then perhaps there are not too many "piled" up and >the delay would not be too outrageous? Hi David, That is precisely the area that worries me. The "new enlightment" articles that offer a revolutionary theory that is in opposition to established theory, or articles claiming to advance understanding with new insight need careful review. Not articles about building dipoles or operating skills. If it's a constuction article of a small piece of equipment, it certainly could be submitted with the article and tested. It's not every article that needs tough technical review, just the new discoveries! 73 Tom From Unknown Tue Jan 09 18:20:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uchinews!gw2.att.com!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: n2try@ix.netcom.com Newsgroups: rec.radio.amateur.antenna Subject: Emergency 2M/70cm J-Pole 4sale Date: Sun, 07 Jan 1996 19:50:11 GMT Organization: Netcom Lines: 20 Message-ID: <4cp8fi$5fp@ixnews2.ix.netcom.com> NNTP-Posting-Host: ix-lou-ky1-26.ix.netcom.com X-NETCOM-Date: Sun Jan 07 11:55:30 AM PST 1996 X-Newsreader: Forte Agent .99b.112 If you are interested in an emergency J-Pole antenna cut for the 2meter and the 70cm band, I will make one and mail it to you first class mail. The antenna is made of high quality 450ohm ladder wire and is cleverly constructed to be rolled up and put into an emergency bag and hung on a tree or Hotel ceiling. If you are interested in one of my antennas, please send 10.95 plus 3.50 s/h to: N2TRY Dave Evangelista P.O. Box 22384 Louisville, KY 40252 Or if you have questions, please email me at: n2try@ix.netcom.com From Unknown Tue Jan 09 18:20:15 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip36.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: Equipment ground Date: Sun, 7 Jan 1996 20:30:46 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 16 Message-ID: References: <1996Jan5.210448.27234@ke4zv.atl.ga.us> <4coqnb$e72@giga.bga.com> NNTP-Posting-Host: usr4ip36.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4coqnb$e72@giga.bga.com> kk5dr@bga.com writes: >From: kk5dr@bga.com >Subject: Re: Equipment ground >Date: 7 Jan 1996 16:00:43 GMT >> gary@ke4zv.atl.ga.us (Gary Coffman) writes: [A whole bunch of GOOD STUFF deleted] >The SOLE purpose of a station or equipment ground, is for RFI, nothing else. You gotta be kidding! BTW, does "for RFI" mean for generating RFI or preventing it? Just curious. From Unknown Tue Jan 09 18:20:16 1996 Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!zeus.ia.net!kovar From: kovar@zeus.ia.net (Jack Kovar KE0AX) Newsgroups: rec.radio.amateur.antenna Subject: FS: 2 Hygain triband verticles Date: 7 Jan 1996 23:26:35 GMT Organization: InterAccess Networking Lines: 14 Message-ID: <4cpkrb$mr6@hera.ia.net> NNTP-Posting-Host: zeus.ia.net X-Newsreader: TIN [version 1.2 PL2] I have two hygain matching 10,15,20 meter verticles for phased or dipole config, Or independent. If someone would like them and lives in eastern Iowa, I will make a deal you can not refuse. I will be back home monday night. Thanks Jack Kovar Ke0ax kovar@ia.net Toddville, Ia. From Unknown Tue Jan 09 18:20:17 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!news.islandnet.com!salmon!clinton.peebles From: clinton.peebles@saloon.bcbbs.net (Clinton Peebles) Newsgroups: rec.radio.amateur.antenna Subject: G5RV Reviews? Date: Mon, 8 Jan 1996 13:26:00 GMT Message-ID: <9601080536177457@saloon.bcbbs.net> Organization: Salmon Siding Saloon BBS 604-357-9942 Distribution: world References: <4cgjte$4vc@ixnews4.ix.netcom.com> Lines: 15 L>I have just been give tne G5RV multi-band dipole as a Christmas gift. L>Any reviews on this antenna? Any hints? There's too much snow on the L>ground to hang it now...I'm dying to try it out. Get it has high as you possibly can.. ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» ş Clinton Peebles VE7-KNL ş ş SYSOP - Salmon Siding Saloon BBS - 604-357-9942 ş ş Internet: Clinton.Peebles@saloon.bcbbs.net ş ş cpeebles@wimsey.com ş ş Packet Radio: VE7KNL@VE7CW.#SEBC.BC.CAN.NOAM ş ČÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍĽ --- ţ QMPro 1.53 ţ Windows -- the industry substandard. From Unknown Tue Jan 09 18:20:18 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!news.cais.com!cais2.cais.com!builder From: Neil Fox Newsgroups: rec.radio.amateur.antenna Subject: Re: Gain on helicals vs. yagis Date: Fri, 5 Jan 1996 21:45:48 -0500 Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 10 Message-ID: References: <4c91in$rau@solitaire.cv.nrao.edu> NNTP-Posting-Host: cais2.cais.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: builder@cais2.cais.com In-Reply-To: <4c91in$rau@solitaire.cv.nrao.edu> The helix is not well modeled, in general by NEC. There are no accurate simulations available, but as suggested, the IEEE Transactions on Antennas and Propagation has measurement data that can give a good feel. The waveguide behavior of the helix makes it an odd "wire" antenna. Much work has been done since Kraus did his helix work in the late 40's, but not much has been accurate, generally. I have compiled most of the helix articles in QST, IEEE, and IRE from 1949-present. If anyone is interested, just email me. Neil From Unknown Tue Jan 09 18:20:19 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: rpmarkey@nbn.NET (Rick Markey) Newsgroups: rec.radio.amateur.antenna Subject: Re: Ham-Ant Digest V95 #656 Date: 6 Jan 96 23:44:24 GMT Organization: ucsd usenet gateway Lines: 15 Message-ID: <199601062344.PAA14989@UCSD.EDU> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu At 03:45 AM 1/5/96 -0500, you wrote: > Does anyone know what kind of antenna that can be mounted to a >Corvette w/o drilling holes. The 2nd problem is that the heater strips >run vertical on the back window. I am currently using 2 meter and 440. >Thanks, >KE4OFP > >------------------------------ A friend of mine years ago, used a Larsen 3/4" mount through one of the fake air vents on the back deck. On the inside, He used a piece of aluminum for a ground plane and always had good success. de Rick Markey, KN3C From Unknown Tue Jan 09 18:20:20 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!Norway.EU.net!nntp.uio.no!news.kth.se!tybalt.admin.kth.se!celsiustech.se!seunet!news2.swip.net!dos.canit.se!oden.abc.se!news2.transpac.net!news.tripnet.se!news From: Ulf.Lange@tripnet.se (Ulf Lange) Newsgroups: rec.radio.amateur.antenna Subject: Re: HB9CV Info Date: 7 Jan 1996 07:10:31 GMT Organization: Tripnet AB Lines: 12 Message-ID: <4cnrl7$ic@minox.tripnet.se> References: <30EC3273.1CB8@ieee.org> NNTP-Posting-Host: heron8.tripnet.se Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 In article <30EC3273.1CB8@ieee.org>, s.saunders@ieee.org says... > >Can anyone point me towards info on the HB9CV anywhere on the Net or >elsewhere ? Reply by mail please. The book Antennenbuch by Karl Rothammel covers the HB9CV topic very well. Several examples of HB9CV antennas for the 20 m - 70 cm band are given. Try your nearest public library. Ulf SM6FYQ From Unknown Tue Jan 09 18:20:21 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!van-bc!news.mindlink.net!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in2.uu.net!news.ner.bbnplanet.net!usenet.teradyne.com!ttd.teradyne.com!rice From: rice@ttd.teradyne.com (John Rice) Newsgroups: rec.radio.amateur.antenna Subject: Re: Help Tuning 14AVQ Date: 7 Jan 96 14:09:53 CDT Organization: Teradyne Inc., Telecommunications Division Lines: 19 Message-ID: <1996Jan7.140953.1@ttd.teradyne.com> References: <4cc60g$sjj@Titania.wintermute.co.uk> <30E9675E.472E@aol.com> NNTP-Posting-Host: riker1.ttd.teradyne.com In article <30E9675E.472E@aol.com>, Jeff Blumenfeld KB3DX writes: > Dean - > > I have a Hustler 4BTV rather than a 14AVQ, but with virtually all > trap verticals, the order of tuning is the same. Start with the 10 > meter section, and tune by lengthening or shortening the tubing > below the first trap (lengthening makes the antenna resonant at a > higher frequency) to get it resonant on 10. Uhhh. Last time I looked, 'lengthening' an antenna lowered the resonant frequency. -------- John Rice - K9IJ | "I speak for myself, not my employer". k9ij@avsoft.com | Miracles, Magic and Sleight-of-hand done here. k9ij@amsat.org | Licensed since 1959 (708)-438-5065 - (bbs ) | Ex: K8YZR, KH6GHC, WB9CSP, W9MMB, WA1TXV From Unknown Tue Jan 09 18:20:22 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!usenet.eel.ufl.edu!col.hp.com!nntp.coast.net!frankensun.altair.com!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!news.willamette.edu!news.orst.edu!news.PEAK.ORG!billn From: billn@PEAK.ORG (Bill Nelson) Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP! R-7 Problem? Date: 8 Jan 1996 05:12:57 GMT Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA Lines: 19 Message-ID: <4cq94p$i64@odo.PEAK.ORG> References: <4chkv1$lq6@fcnews.fc.hp.com> NNTP-Posting-Host: peak.org X-Newsreader: TIN [version 1.2 PL2] Bret McKee (mckee@fc.hp.com) wrote: : I had a trap die (open) in my R7 this fall. The antenna worked fine on : 10/12/15 meters, but had an infinite SWR on all the lower bands. The 17 : meter trap was to blame, and Cushcraft was very responsive. If your : antenna will not load up on 10 meters, you don't have any open traps, : because the 10 meter element doesn't use any traps, although it still : goes through the mystic black box at the bottom. This doesn't make any sense. The 10 meter section is only the bottom part of the antenna - so all you can find out is if the trap immediately above is shorted. You cannot tell if the trap is open. Now, if it tunes up on 40 meters, then you know all the traps are good. All the above assumes that Cushcraft used traditional trap construction for the antenna. Bill From Unknown Tue Jan 09 18:20:23 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: loading coil conversion problem for 20 meter beam Date: 8 Jan 1996 18:33:58 GMT Organization: Hewlett Packard Corvallis Site Lines: 36 Message-ID: <4cro2m$88c@hpcvsnz.cv.hp.com> References: <00001fea+00001bf7@msn.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Rick Ruhl (Ricker_msn@msn.com) wrote: : Hi gang: : Here's one for the masses. I'm building the short 20 meter yagi as : described in the 1978 Radio Amateur's Handbook. For the loading : coils, it says to use 1-1/8 diameter centers for the coils, however, : I can only find 1-1/16 inch centers. I need to convert the number of : turns on the coil (9 inches X 1-1/8 to 9 inches X 1-1/16th). Just use the formula for coil inductance: L(uH) = (n*r)^2 / (9*r + 10*l) where n is turns, r is radius in inches and l is length in inches. The radius is to the center of the wire, not the form radius, but for your application it may make little difference. If r1 = 0.600" and r2 = 0.569", and l = 9", then n2/n1 = 1.053 In other words, add about 5% to the number of turns on each coil. That formula is not perfect, but it will be quite accurate in giving you the new number of turns if you make a small change in one of the other parameters. Of course, for critical work, there are other factors to consider: distributed capacitance along the coil may be slightly different, and if the coil was accurately designed for a particular element length AND diameter, be sure to stay with the same...the diameter IS important! -- Cheers, Tom tomb@lsid.hp.com From Unknown Tue Jan 09 18:20:24 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!world!mv!wd1v.mv.com!user From: john@wd1v.mv.com (John Seney) Subject: Log Periodic for Icom 706 Message-ID: Organization: MV Communications, Inc. Date: Fri, 5 Jan 1996 22:19:05 GMT X-Nntp-Posting-Host: wd1v.mv.com Lines: 18 I'd be interested in a log periodic design that went from 6 meters down to maybe 20 meters so my 706 could play with some directional gain. Anyone got plans? 73, FYI: The latest version of Digital Scope.FAQ <304> is on my WWW Home Page. (All opinions are my own, including Digital Storage Scope.FAQ) John D. Seney |_|_|_|_| john@wd1v.mv.com 144 Pepperidge Dr. |_| |_| www http://www.mv.com/ipusers/wd1v Manchester, NH 03103-6150 |_|_ _|_| wd1v@wb1dsw.nh.usa.noam LeCroy Sales Engineer | | | | | 800-553-2769 (H) 603-668-1096 (F) 603-627-1623 (P) 800-SKYPAGE #5956779 From Unknown Tue Jan 09 18:20:25 1996 Path: news.epix.net!mango.epix.net!will From: will@epix.net Newsgroups: rec.radio.amateur.antenna Subject: Re: Log Periodic for Icom 706 Date: Sat, 6 Jan 1996 09:57:26 -0500 Organization: epix.net Lines: 15 Message-ID: References: NNTP-Posting-Host: mango.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: On Fri, 5 Jan 1996, John Seney wrote: > I'd be interested in a log periodic design that went > from 6 meters down to maybe 20 meters so my 706 could > play with some directional gain. Anyone got plans? A generic design appears in the ARRL ANTENNA BOOK. Or call Charlie Brainerd KA1PM at 719 395-4100. He makes & sells the TENNADYNE LPDA's. Last I knew he did not offer one from 6 to 20 meteres, but all of his HF models go from 10-20m. will@epix.net - KD3XR - W F Sill, Tunkhannock, PA From Unknown Tue Jan 09 18:20:26 1996 Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!news.enterprise.net!news.enterprise.net!btnet!demon!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: Bud Simmons Newsgroups: rec.radio.amateur.antenna Subject: MFJ HF ANTENNAS? Date: 8 Jan 1996 16:23:40 GMT Organization: LATG DSE Lines: 4 Message-ID: <4crgec$b5s@newsgate.sps.mot.com> NNTP-Posting-Host: simmonsmac.sps.mot.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:rec.radio.amateur.antenna Does anyone have any experience with the MFJ multi-band verticals? How do they compare with Butternut etc. From Unknown Tue Jan 09 18:20:27 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: NEC4 Date: 5 Jan 1996 09:26:29 GMT Organization: ELNEC/EZNEC Software Lines: 16 Message-ID: <4ciqs5$rqu@maureen.teleport.com> References: NNTP-Posting-Host: ip-pdx02-19.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > "Jason R. Rieg" writes: > Can anyone tell me how I can get my grubby little hands on a copy of NEC4? > Thanks. Yep, use those hands to pass $850.00 to the U. of California and it's yours (assuming you're a U.S. citizen). Ordering is done via Jerry Burke at Lawrence Livermore National Labs. I'll get you his address if you're interested. Last time I checked, only source code was available except for the Macintosh. So you'll also have to get a FORTRAN compiler to compile it for other types of machines. Roy Lewallen, W7EL From Unknown Tue Jan 09 18:20:28 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!bcstec!matrix.hv.boeing.com!richesop From: richesop@matrix.hv.boeing.com (Peter Richeson) Subject: Re: NEC4 X-Nntp-Posting-Host: matrix.hv.boeing.com Message-ID: Sender: nntp@bcstec.ca.boeing.com (NNTP News Access) Organization: The Boeing Company References: Date: Fri, 5 Jan 1996 13:24:29 GMT Lines: 14 I do not think it is on the free mkt yet. Try writing to lawrence Livermore National laboratory, don't have there addr. Hope this helps. . ''' . (o o) ___ooO-(_)-Ooo________________________________________________________ Peter D. Richeson | "I don't believe in a no-win | Email: richesop@matrix.hv.boeing.com | scenaro." | Phone (205)461-2603 | - Admiral James T. Kirk | ---------------------------------------------------------------------- I do not speak for any one but me, and some times not even for me. ---------------------------------------------------------------------- From Unknown Tue Jan 09 18:20:29 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!news.onramp.net!zdc!zippo!usenet From: "Jason R. Rieg" Subject: Re: NEC4 Content-Type: text/plain; charset=us-ascii Sender: usenet@news.zippo.com Content-Transfer-Encoding: 7bit Nntp-Posting-Host: jrieg.bpd.harris.com Organization: Harris Corporation Message-ID: References: <4ciqs5$rqu@maureen.teleport.com> X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Mime-Version: 1.0 Date: Mon, 8 Jan 1996 16:30:28 GMT Lines: 27 Please excuse my ignorance, but it is my understanding that software developed at public institutions (such as U.C.) are public domain and a U.S. citizen can on ly be charged a nominal fee for them, much the same as shareware. With this in mind, why is there an $850 charge? w7el@teleport.com (Roy Lewallen) wrote: > >Yep, use those hands to pass $850.00 to the U. of California and it's yours >(assuming you're a U.S. citizen). Ordering is done via Jerry Burke at >Lawrence Livermore National Labs. I'll get you his address if you're >interested. > .. > >Roy Lewallen, W7EL > Thanks, -- | Jason Robert Rieg | "listen: there's a hell of a | ___ __o | | Antenna Electrical Engineer | good universe next door; | ___ _`\<,_ | | Harris Corp. / Broadcast Div. | let's go." | ___ (*)/ (*) | | jrieg@harris.com | - E.E. Cummings | ^^^^^^^^^^^^ | From Unknown Tue Jan 09 18:20:30 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!crl.dec.com!caen!sol.ctr.columbia.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!hkusuc.hku.hk!usenet From: tygleung@hkursc.hku.hk (Tony) Subject: Need help for ( Cushcraft ARX-2B ) X-Nntp-Posting-Host: p78.du.hku.hk Message-ID: Sender: usenet@hkusuc.hku.hk Organization: The University of Hong Kong X-Newsreader: Forte Free Agent 1.0.82 Date: Tue, 9 Jan 1996 02:59:13 GMT Lines: 8 Any ham is using ARX-2B from Cushcraft ...? 1. Manual for ARX-2B or 2. Need help to step by step assemble & fine tune the SWR on that antenna. 73', Tony VR2ZXZ tygleung@hkursc.hku.hk From Unknown Tue Jan 09 18:20:31 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!news1.halcyon.com!coho!gordonm From: gordonm@coho.halcyon.com (Gordon Mitchell) Newsgroups: rec.radio.amateur.antenna Subject: Need UHF DF ideas Date: 7 Jan 1996 20:16:08 GMT Organization: Northwest Nexus Inc. Lines: 9 Message-ID: <4cp9m8$63q@news1.halcyon.com> NNTP-Posting-Host: coho.halcyon.com I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and Adcock array with a doppler scheme for DF. It would be ideal to find one that is hand-held, compact, and doesn't take much power. Generally it will be used in the 130-900 MHz range. Gordon Mitchell K7HCV gordonm@Bug-Killer.com Future Focus, Inc (206) 489-0446 Electronic eavesdropping countermeasures From Unknown Tue Jan 09 18:20:32 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!g1ukq.demon.co.uk From: andy@g1ukq.demon.co.uk (andy) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need UHF DF ideas Date: Tue, 09 Jan 1996 18:35:00 GMT Lines: 30 Message-ID: <30f0be3e.1962605@news.demon.co.uk> References: <4cp9m8$63q@news1.halcyon.com> <4cpd4m$6c4@nnrp1.news.primenet.com> NNTP-Posting-Host: g1ukq.demon.co.uk X-NNTP-Posting-Host: g1ukq.demon.co.uk X-Newsreader: Forte Agent .99d/32.168 Christopher Trask wrote: >Gordon Mitchell wrote: >: I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and >: Adcock array with a doppler scheme for DF. > >: It would be ideal to find one that is hand-held, compact, and doesn't >: take much power. Generally it will be used in the 130-900 MHz range. > >: Gordon Mitchell K7HCV gordonm@Bug-Killer.com >: Future Focus, Inc (206) 489-0446 >: Electronic eavesdropping countermeasures I've just built a doppler DF unit for use on 2m, but it *should* operate well into UHF. It uses a 4001 as a 700Hz oscillator with complimentary outputs. These outputs are fed to g2 on a couple of BF982 dual-gate FETs which act as gated wide band pre-amps. If you want more info I can try and get the schematics scanned. Andy. andy@g1ukq.demon.co.uk magici@cix.compulink.co.uk G1UKQ @ GB7ULV.#14.GBR.EU From Unknown Tue Jan 09 18:20:33 1996 Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@gslink.net (Russ LeBlanc) Newsgroups: rec.radio.amateur.antenna Subject: Re: Noise rejection Date: 7 Jan 1996 16:45:33 GMT Organization: Central FL Listeners Group Lines: 48 Message-ID: <4cotbd$ho6@ddi2.digital.net> References: <820786002snz@bwoodsch.demon.co.uk> <4cijtc$fra@sparky.midwest.net> NNTP-Posting-Host: @204.215.242.169 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 In article <4cijtc$fra@sparky.midwest.net>, gayle@ldd.net says... -> ->Phil Marshall wrote: -> ->>I am interested to know if there is a basic simple antenna type or -technique ->>which will improve the rejection of local man made noise. I have read that ->>1/4 wave verticles are poor in this respect but maybe this is due to their ->>omnidirectional reception properties. Therefore, if this basic type is ->>considered poor, is there a mechanism for noise rejection that I am not -aware ->>of. -> -> -> ->>Can anyone please help or offer any theory on this subject ? ->>-- ->>Phil Marshall -> ->Hello, Phil: -> ->While you don't say what frequencies you are interested in, I assume ->that you are talking about something in the HF spectrum... -> ->Anyway, keep in mind that most man-made noise is vertically polarized. ->By simply going to a horizontal antenna, you will drop the noise by a ->significant amount. Bear in mind that horizontal antennas tend to be vertically polarized off the ends (horizontally broadside). Two noise fighting receiving antennas are the TTFD (terminated tilted folded dipole) which is a wideband antenna, and the other one is a (tuned) phased horizontal loop antenna which is featured in the Sept 95 QST. The latter provides around 4-5 s-units of power line noise rejection and includes some helpful theory on the subject in the article. You could also try the JPS ANC4 antenna phasing unit for noise reduction if you can adequately sample the noise source with the "noise" antenna. There's a homebrew version available ("The Null Steerer Revisited" in July 94 QST) which covers the HF ham bands (the JPS covers the whole HF range). Hope this helps, Russ From Unknown Tue Jan 09 18:20:34 1996 Path: news.epix.net!news.sprintlink.net!news.wwa.com!buffnet2.buffnet.net!usenet From: daveb@buffnet.net (david james) Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-center fed dipole? Date: 9 Jan 1996 00:42:11 GMT Organization: BuffNET Lines: 14 Message-ID: <4csdl3$57p@buffnet2.buffnet.net> References: <4c2cso$8g7@news3.digex.net> <4cenjl$lnl@chnews.ch.intel.com> NNTP-Posting-Host: fppp5.buffnet.net X-Newsreader: WinVN 0.92.2 In article <4cenjl$lnl@chnews.ch.intel.com>, cmoore@vegas.ch.intel.com (Cecil A. Moore~) says: > >Hi Eric, my 102 ft dipole fed with 300 ohm ladder-line is an efficient all- >band HF antenna. On 80m, a parallel cap at about 38 feet kills the reflection s >and drops the impedance to a flat 300 ohms. On 40m, a 6 ft stub at the Xmtr >end does the same thing. A 4:1 balun takes the impedance from 300 ohms to 75 >ohms. I need no antenna tuner on any HF band. The balun sees nothing but So where exactly (38 feet from feed point .. or what) is the cap. Maybe a diagram ?? Thenks daveb@buffnet.net From Unknown Tue Jan 09 18:20:36 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-center fed dipol˙˙˙˙˙ Date: 8 Jan 1996 18:13:43 GMT Organization: Intel Corporation, Chandler, AZ Lines: 27 Distribution: world Message-ID: <4crmsn$1a4j@chnews.ch.intel.com> References: <4cenjl$lnl@chnews.ch.intel.com> <8B863D9.02CF0004A5.uuout@cencore.com> NNTP-Posting-Host: scorpion.ch.intel.com In article <8B863D9.02CF0004A5.uuout@cencore.com>, FORREST GEHRKE wrote: >While I don't disagree with your conclusions, I do take >exception to your belief that "most hams had access to a VTVM >and a grid dip meter" in the 1920's and 1930's. Hi Forrest, I guess I was fortunate. My Elmer was Shorty, W5OLV (SK) and he was the local Madison Co., TX radio/TV repairman. He loaned out his VTVM and grid dip meter to all the local hams. But, as you say, one can make do with a pickup loop with a neon or other kind of bulb. >"The most dangerous persons and groups in our society >are those who do not know that they do not know". Funny thing, W5OLV showed me exactly how to tune up an antenna when I was in junior high school. I memorized the procedure without really knowing what I was doing. Here, almost 50 years later, those memories come pouring back along with the understanding and knowledge of what is actually happening - at least what appears to be happening. :-) After the latest discoveries in quantum physics, I'm not sure waves and particles exist at the sub-atomic level. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Tue Jan 09 18:20:36 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.antenna Subject: Re: Poor Stereo Reception Local? Date: Sun, 07 Jan 96 07:06:18 GMT Lines: 13 Message-ID: <821042133.20329@pinetree.microserve.com> References: NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 joeg@news1.cybernex.net (Joseph Gutstein) wrote: >My Onkyo receiver indicates zero signal strength when I've used the >following: a dipole, a Terk Amplified antenna, no antenna at all. Most Onkyo receivers have a better than average front end. It's unlikely this is an overload problem. Take your receiver to a service center and have the sensitivity checked before spending more money on antennas. 73, Jack WB3U From Unknown Tue Jan 09 18:20:39 1996 Path: news.epix.net!plum.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Sun, 7 Jan 1996 21:08:10 -0500 Organization: epix.net Lines: 91 Message-ID: References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4ceesi$fae@hg.oro.net> NNTP-Posting-Host: plum.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4ceesi$fae@hg.oro.net> On Wed, 3 Jan 1996, Jim Weir wrote: > > All I can do is comment on PVC, nylon, and the rest of the plastics > after doing antenna design and consulting for over 30 years. I > realize that's not very much time (if you are a tree) but I have done > several hundred designs and prototypes, quite a few of which were done > using plastic as the construction medium. Those of you who fly light > aircraft probably recognize some of those designs. > > Anyway, I've used PVC plain old water pipe from below 30 MHz. to above > 2 GHz. and if you allow a SLIGHT fudge factor for some minor > dielectric foreshortening and a SLIGHT fudge factor for some minor > dielectric losses, PVC is by far superior to anything else I've been > able to get my hands on as a construction support for prototypes and > one-off designs (like the ham antennas around the house). > > As a matter of fact, I've just completed the design on a series of VHF > (100-200 MHz.) base loaded monopoles, which are notoriously "goosey" > to local perturbations in the immediate vicinity of the elements. The > antennas are hermetically sealed in 3/4" PVC schedule 80 water pipe > and all that was required was about a 5% pruning factor (over and > above the regular 3-8% w/l factor) for the PVC loading. Measurements > relative to the same monopole in air showed less loss than I can > measure with the HP/Tek antenna range that I do FCC measurements on > (0.1 dB reliably is about the best I can guarantee). > > As to nylon being a bad actor, why do you suppose then that there is a > mil spec and a commercial spec for coil forms built on a nylon-filled > base and tube? Sorry, this one doesn't wash either. > > I am glad to see that somebody used the black ABS stuff and is > reporting good results with it for coil forms. I've never used the > black just because I suspicioned that anything black probably had > dissolved carbon particles in it. Glad to know I can at least start > messing around with it, as it is pretty stout stuff AND I can get > diameters up to 6" in the form of sewer pipe. > > As an aside to particulate conductor matter in the mechanisms, I was > once called upon to make some tests with HF/VHF/UHF antennas installed > inside a thin plywood shell, then the thin wood covered with dacron, > then the dacron impregnated with a paste (dope) made of solvent and > aluminum powder (a Bellanca aircraft wooden wing). We thought the > aluminum dope would play hell with the antennas. Not so. Once again, > we set up two dipoles on the test range and put a wing in between > them. Not a bit of loss. Put the antenna inside the wing. Couldn't > tell the difference. Our guess was that the aluminum powder particles > were each suspended in a small sphere of the solvent and couldn't make > contact to form a continuous sheet. On the other side of that coin, > we got reports that there was a German metallic paint that gave a > gorgeous finish, but that antennas buried inside the foam wing of > various homebuilt airplanes using this paint had the response of a > piece of spaghetti inside a copper septic tank. I doesn't explains > 'em, I just reports 'em. > > Finally, as to the grey stuff (flex conduit) in PVC, I've used it, but > since the white stuff in the form of water pipe is cheaper, I've never > had a reason to mess with it very much. Sorry, I don't buy the > "microwave oven" test for goodness of a material except at 2.4 GHz. or > so. > > Jim > > > > Jim Please explain your thinking on the microwave tests more. I would think that if it passed the test it would be good at most any frequency. However even if it fails I would expect many materials would be suitable for HF use. Are you saying that a material that passes the oven test might still be unsuitable for use at HF? Garry WB0NNO Jim Weir VP Engineering | "We seem to be standing on > RST Engineering | the foreskin of technology." > Grass Valley CA 95945 | (Gen. Chuck Yeager) > voice/fax 916/272-1432 | > rst-engr@oro.net AR Adv WB6BHI CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ > > > From Unknown Tue Jan 09 18:20:40 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!willis.cis.uab.edu!ddsw1!news.mcs.net!usenet From: gmyers@mcs.com (Gary Myers) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Mon, 08 Jan 1996 03:00:10 GMT Organization: MCSNet Internet Services Lines: 31 Message-ID: <4cq1d3$4hk@News1.mcs.net> References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4bc5vo$bvh@ixnews6.ix.netcom.com> <30E43ED4.5FD1@csg.mot.com> <820577250.20688@pinetree.microserve.com> NNTP-Posting-Host: gmyers.pr.mcs.net X-Newsreader: Forte Free Agent 1.0.82 jackl@pinetree.microserve.com (WB3U) wrote: > Paul Moller wrote: >>Black is usually achieved by adding carbon, which is lossy. Other colors >>should be more friendly. PVC in itself is not bad, and certainly not as >>lossy at hf as the rumor of years gone by has indicated. >Paul, have you seen any numbers for this, or other comparative >information? I'm one of those who has stayed away from PVC because >of those rumors. Do you know if PVC is less lossy than the "bad" >plastics like Nylon? >73, >Jack WB3U I have no figures, but I do know that PVC is sufficiently lossy at 27 MHz, that it is the material of choice (in sheet form) for use with rf dielectric sealers. We use 27 MHz sealers at work to seal hazardous materials like radioactively-contaminated waste into PVC pouches; the rf heats the seam at the open end of the pouch and melts the PVC together to form a (an?) hermetic seal. This doesn't work AT ALL with sheet polyethylene, so PVC definitely is more lossy at 27 MHz than PE. I once put a short section of PVC pipe in a microwave oven (along with a cup of water, for the oven's sake), and it got HOT, so it certainly is lossy at 2450 MHz, as well. -- 73, Gary K9CZB From Unknown Tue Jan 09 18:20:41 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK From: Ian White Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Mon, 8 Jan 1996 07:54:07 +0000 Organization: IFW Technical Services Lines: 39 Distribution: world Message-ID: References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4bc5vo$bvh@ixnews6.ix.netcom.com> <30E43ED4.5FD1@csg.mot.com> <820577250.20688@pinetree.microserve.com> <4cq1d3$4hk@News1.mcs.net> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.10 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <4cq1d3$4hk@News1.mcs.net>, Gary Myers wrote: > >I have no figures, but I do know that PVC is sufficiently lossy at 27 >MHz, that it is the material of choice (in sheet form) for use with rf >dielectric sealers. We use 27 MHz sealers at work to seal hazardous >materials like radioactively-contaminated waste into PVC pouches; the >rf heats the seam at the open end of the pouch and melts the PVC >together to form a (an?) hermetic seal. This doesn't work AT ALL with >sheet polyethylene, so PVC definitely is more lossy at 27 MHz than PE. > >I once put a short section of PVC pipe in a microwave oven (along with >a cup of water, for the oven's sake), and it got HOT, so it certainly >is lossy at 2450 MHz, as well. This clearly illustrates what I was trying to say a few days ago: one type of "PVC" can be very different from another. It's impossible to generalize. The soft, transparent grade used for pouches is clearly NOT the same material as the rigid grade used for pipe. They both contain polyvinyl chloride but there the resemblance ends. The soft grade contains lots of plasticizer and is also polymerized differently, with less cross-linking at the molecular level than the rigid grade. The rigid grade also contains colorant and possibly inorganic fillers. If we just say "Huh, it's all PVC," we're only confusing ourselves. Even saying "PVC pipe" is hardly less confusing. Gary found one type that got hot in the microwave oven, while I found one that didn't and another that only got slightly warm. But maybe it wasn't PVC after all - maybe it was ABS pipe? Sorry, but there's simply no substitute for testing the specific material that you are hoping to use. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From Unknown Tue Jan 09 18:20:43 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 7 Jan 1996 17:29:39 GMT Organization: Intel Corporation, Chandler, AZ Lines: 37 Distribution: world Message-ID: <4covu3$1att@chnews.ch.intel.com> References: <4c6i7c$olr@chnews.ch.intel.com> <820564809.13886@pinetree.microserve.com> <4ch958$gp9@chnews.ch.intel.com> <4cifk9$itt@news.azstarnet.com> NNTP-Posting-Host: scorpion.ch.intel.com In article <4cifk9$itt@news.azstarnet.com>, Wes Stewart wrote: >The SWR metering circuit is calibrated at 50 ohm, so with a >100 ohm load it correctly displays a 2:1 SWR. Hi Wes, thanks for the response. I guess the above is what is bothering me. I can set up a system where there is no reflected power from that 100 ohm dummy load so the 2:1 SWR displayed by the 50 ohm metering circuit is in error. Let's say the load line on the SB-201 is 5k ohms and let's say the antenna is a resonant (resistive) 300 ohm folded dipole with no reflections. 5k ohms to 300 ohms is an easy match for a pi- network. And yet a built-in 50 ohm SWR meter might read 6:1 falsely indicating a problem. I'm not an expert on directional couplers. I do know that a toroidal pickup gives a voltage in phase with the current which is vectorally added to the transmission line voltage and adjusted for a null looking into a dummy load. This kind of device will give a reflected power indication when there is no reflected power if the load is not equal to the calibration impedance. The directional coupler in the SB-201 is the type where parallel inductive couplers are close to the transmission line. One wire gives forward current and the other wire gives reverse current. They are indeed calibrated for 50 ohms but it looks like if there are no reflections, there will be no indication of reflected power. It's just that the indicated forward power will be in error if the load is not equal to 50 ohms. So is the parallel wires type directional coupler superior to the toroidal pickup type for the above reasons? thanks and 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Tue Jan 09 18:20:44 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 7 Jan 1996 17:38:24 GMT Organization: Intel Corporation, Chandler, AZ Lines: 10 Distribution: world Message-ID: <4cp0eg$15lv@chnews.ch.intel.com> References: <4ch958$gp9@chnews.ch.intel.com> <4cjpkn$rno@newsbf02.news.aol.com> NNTP-Posting-Host: scorpion.ch.intel.com In article <4cjpkn$rno@newsbf02.news.aol.com>, W8JI Tom wrote: >However it is important to remember the load is conjugately matched to the >loadline of the device, not a real resistor. So that's how we get more than 50% efficiency from a generator? The resistive loadline is not dissipative? Where does the power go? :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From Unknown Tue Jan 09 18:20:45 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!nwfocus.wa.com!news.nas.com!kristina.az.com!andys From: andys@kristina.az.com (Andrew James) Newsgroups: rec.radio.amateur.antenna Subject: TV antenna plans? Date: 9 Jan 96 03:52:26 GMT Organization: Network Access Services, Inc. Lines: 11 Message-ID: NNTP-Posting-Host: kristina.az.com X-Newsreader: NN version 6.5.0 #1 (NOV) Does anyone have plans to make a simple tv antenna that works better than rabbit ears? Thank you. Andrew James andys@az.com -- Andy Web = http://www.az.com/~andys E-mail = andys@az.com From Unknown Tue Jan 09 18:20:46 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!newshost.convex.com!news.dfw.net!news From: David Mclean Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Web Page with MODs, Calls lookup, Ham links, Swap page, and more!! Date: 8 Jan 1996 00:34:53 GMT Organization: Road Kill Cafe! Lines: 17 Message-ID: <4cpord$gok@fnord.dfw.net> NNTP-Posting-Host: dfw.dfw.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.misc:96612 rec.radio.amateur.antenna:18314 rec.radio.amateur.digital.misc:13531 rec.radio.amateur.equipment:23497 rec.radio.amateur.homebrew:12589 rec.radio.amateur.policy:32440 rec.radio.amateur.space:6094 I would like to welcome all of you to my web page. The address of my web page is "http://www.dfw.net/~dmclean". I have many links that you will like. Here is a list of things that I have on my Web page: 1. Swap Page 2. Mods page 3. QRZ call lookup 4. Repeters freqs. 5. Links to F.C.C, A.R.R.L, and many more. Check it out. You will like it. -- David Mclean From The World of Hamradio KC5NNV is Clear! _________________________________________________________________________ ------------------------------------------------------------------------- From Unknown Tue Jan 09 18:20:47 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.nuri.net!usenet From: ykoc2@ocmp.sk.co.kr (Gun Kim) Newsgroups: rec.radio.amateur.antenna Subject: What kind of HF antena using space of apartment's balconi? Date: 9 Jan 1996 03:19:57 GMT Organization: Yukong Oxichemical Lines: 9 Message-ID: <4csmst$ad7@cham.nuri.net> NNTP-Posting-Host: 168.154.151.101 Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Hellow! I'm biginner of amateur radio,in South Korea. I have 2m and HF all band Rig. But I am in a difficulty to construct antena system. I need information for using apartment's balconi. thanks, DE DS1AFL 73~~ From Unknown Tue Jan 09 18:20:47 1996 Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!usenet From: tom_boza@ccm.ch.intel.com Newsgroups: rec.radio.amateur.antenna Subject: Where is earth gnd for antennas? Date: 8 Jan 1996 16:21:09 GMT Organization: Intel Corporation, Chandler, AZ Lines: 9 Distribution: world Message-ID: <4crg9l$1534@chnews.ch.intel.com> NNTP-Posting-Host: tboza.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Depending upon the soil content, where is "true" ground when calculating height above ground for antennas? Since I live in Arizona, where the soil is dry rock and sand, I was told that an antenna at 40 ft above earth (dry/rock/sand) ground is the same as if the antenna was at 60 ft above earth in Florida (wet/top soil) ground. True? WB7ASR... From Unknown Tue Jan 09 18:20:48 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Listserv@ucsd (Mailing List Processor) Newsgroups: rec.radio.amateur.antenna Subject: Re: your LISTSERV request "help tuning 14avq" Date: 8 Jan 96 07:59:18 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601080759.XAA13439@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu The mailing list "tuning" could not be found. You may use the INDEX command to get a listing of available mailing lists. From lwbyppp@epix.net Fri Jan 12 14:05:21 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.antenna Subject: Mobile CB antenna question Date: 3 Jan 96 19:04:00 GMT Organization: ucsd usenet gateway Lines: 18 Message-ID: <01HZKR7COON60054MO@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Mon, 25 Dec 1995 18:35:28 EST From: writes: -I've used the cellular-phone type cb radio antenna, and it really, -didn't work so well...the only good thing was that the antenna cord -didnt have to pass through the window.... You're right, the only good thing about an antenna like that is that the coax doesn't have to go through the window! As far as antennas go they are poor at best. If you want to be able to transmit any distance you really need the quarter wave whip antenna. Kevin, WB5RUE muenzlerk@uthscsa.edu From lwbyppp@epix.net Fri Jan 12 14:05:22 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!uunet!in2.uu.net!news2.new-york.net!buttercup.cybernex.net!joeg From: joeg@news1.cybernex.net (Joseph Gutstein) Subject: Poor Stereo Reception Local? X-Newsreader: TIN [version 1.2 PL2] X-Nntp-Posting-User: joeg Organization: Cybernex Inc. Message-ID: X-Nntp-Posting-Host: buttercup.cybernex.net Date: Wed, 3 Jan 1996 19:51:50 GMT Lines: 15 I moved to a highrise about 7 miles from the World Trade Center (which I can see) and find that my FM reception is now abysmal. My Onkyo receiver indicates zero signal strength when I've used the following: a dipole, a Terk Amplified antenna, no antenna at all. What I've ending up doing is having no antenna connected to the FM terminals and setting the receiver to the FM mono mode. I must be doing something wrong. Any suggestions would be greatly appreciated. Thanks, Joe --------------------------------------------------------- Joseph Gutstein, Cliffside Park, NJ, joeg@bc.cybernex.com Many can bear adversity but few can bear contempt. (anon) --------------------------------------------------------- From lwbyppp@epix.net Fri Jan 12 14:05:24 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!newsserver.jvnc.net!news.cyanamid.com!news From: chideste@xvnews.unconfigured.domain (Dale Chidester) Newsgroups: rec.radio.amateur.antenna Subject: Re: 160 meter trap Date: 3 Jan 1996 21:44:04 GMT Organization: American Cyanamid Company Lines: 21 Message-ID: <4cetb4$id8@igate2.pt.cyanamid.com> References: <4cc9ie$lrb@news01.aud.alcatel.com> Reply-To: chideste@xvnews.unconfigured.domain NNTP-Posting-Host: 141.173.56.12 I think you may be a little confused about traps. Traps, in dipole antennas, are used to make the antenna resonant at higher frequencies than the length of the dipole. For example, an 80 meter dipole can be made to work on 40 by putting resonant traps in approximately where the ends of a 40 meter dipole would be. This makes the antenna "look" like it ends at the traps and therefore is resonant. Likewise 30, 20, 17, 15, 10 and 6 meter traps could be put in... but at some p oint you wind up with more traps than antenna! The only way I know to get an anten na to resonate at a lower frequency is to load it inductively, as through a tuner . 73 dale ------------------------------------------------------------------------ Dale H. Chidester, PhD N3HAL "Against stupidity, even the Cyanamid Agricultural Research Center Gods in vain doth contend." Agricultural Products Research Divison Schiller PO Box 400, Clarksville Rd. Phone: (609) 716-2430 Princeton, NJ 08543-0400 Email: chidesterd@pt.cyanamid.com ------------------------------------------------------------------------ From lwbyppp@epix.net Fri Jan 12 14:05:24 1996 Path: news.epix.net!uunet!in1.uu.net!nntp.earthlink.net!usenet From: JLB@earthlink.net (Joe Bulger) Newsgroups: rec.radio.amateur.antenna Subject: Arrival angles Date: 3 Jan 1996 21:56:49 GMT Organization: Earthlink Network, Inc. Lines: 4 Message-ID: <4ceu31$90l@argentina.it.earthlink.net> NNTP-Posting-Host: jlb.earthlink.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 Does anyone know of an antenna that is used to measure arrival angles of HF signals? I would like to be able to readout arrival angles of signals on 160M. From lwbyppp@epix.net Fri Jan 12 14:05:25 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!lumkes From: lumkes@cae.wisc.edu (John Lumkes) Newsgroups: rec.radio.amateur.antenna Subject: T-match and gamma match? Date: 3 Jan 1996 22:24:13 GMT Organization: College of Engineering, Univ. of Wisconsin--Madison Lines: 12 Message-ID: <4cevmd$tio@news.doit.wisc.edu> NNTP-Posting-Host: hp-27.cae.wisc.edu I have seen several articles refering to using gamma match design parameters in designing a suitable T-match. I have the gamma match computer program from the latest ARRL Antenna book and want to use it to design a T-match for a portable Yagi (9 element) I am working on. If I want 200 ohm from the T-match (so a 4:1 coaxial balun gives 50 ohms) do I design one gamma match for 100, 200, or what input impedance? Any other pointers and / or hints are welcome. Thanks alot in advance ! John Lumkes AA9QP lumkes@cae.wisc.edu From lwbyppp@epix.net Fri Jan 12 14:05:26 1996 Path: news.epix.net!news.sprintlink.net!alpha.sky.net!winternet.com!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!howland.reston.ans.net!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!lade.news.pipex.net!pipex!news.hol.gr!news From: Douglas Braun Newsgroups: rec.radio.amateur.antenna Subject: Re: Weird antenna software? Date: 8 Jan 1996 03:01:04 GMT Organization: Hellas On-Line Lines: 5 Message-ID: <4cq1dg$c97@newsflash.hol.gr> References: NNTP-Posting-Host: @cronos.hol.gr Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; Linux 1.1.76 i586) To: clifto@indep1.chi.il.us X-URL: news:DKKpr2.78u@indep1.chi.il.us Programs like NEC are designed for exactly this sort of problem. NEC also handles large solid bodies, not just wires. Doug Braun (SV/N1OWU) From lwbyppp@epix.net Fri Jan 12 14:05:27 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!xmission!charnel.ecst.csuchico.edu!csusac!csus.edu!news.ucdavis.edu!taco.engr.ucdavis.edu!ctbaker From: ctbaker@taco.engr.ucdavis.edu (shatter) Newsgroups: rec.radio.amateur.antenna Subject: How to build best antenna? Date: 9 Jan 1996 03:02:45 GMT Organization: College of Engineering - University of California - Davis Lines: 11 Message-ID: <4cslsl$1gn@mark.ucdavis.edu> NNTP-Posting-Host: taco.engr.ucdavis.edu X-Newsreader: TIN [version 1.2 PL2] I have an AOR 1000 scanner and a Yaesu FT-51R dual band 2m/440 ham radio and want to put an antenna in the attic that has great receive from 0.5 Mhz to 1300 Mhz and an antenna which receives 2m/440 and transmit 2m/440 up to 60 watts...Where can I find plans to build these antennas? Also they will be placed in my attic so they can not be too big.. (maybe a max height of 7' and a max radius of 4') Thanks Chad / KE6ZTC From lwbyppp@epix.net Fri Jan 12 14:05:28 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 9 Jan 1996 06:47:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 36 Sender: root@newsbf02.news.aol.com Message-ID: <4ctkko$pp8@newsbf02.news.aol.com> References: <4cp0eg$15lv@chnews.ch.intel.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4cp0eg$15lv@chnews.ch.intel.com>, cmoore@scorpion.ch.intel.com (Cecil A. Moore~) writes: > >So that's how we get more than 50% efficiency from a generator? The >resistive loadline is not dissipative? Where does the power go? :-) > >73, Cecil, KG7BK, OOTC (not speaking for my employer) > > Hi Cecil, Wes's description of the parallel stripline is very good. The frequency slope can be compensated for over a wide frequency range. Bird does that in their "slugs".' As to the other question, the E/I of the maximum available fundamental power is what is matched to when we tune a PA like the SB-201 for maximum output. Some call it dynamic resistance (actually we match to the average value of it), some call it impedance, and some apparently don't even realize or won't admit it exists as a measurable effect. If we just "tickle" the PA with an external signal close to the operating frequency we can measure it, and it "looks" exactly like a resistor to the external generator. That is the thing Walt Maxwell refered to that is conjugately matched to. When it is matched to the load the efficiency can be well over 50%, since it is a non-dissipative resistance. If the SWR is 2:1 and you re-adjust the tank for maximum power transfer, once again the load is matched to the average dynamic resistance or "source impedance". If we make this adjustment, everything is conjugately matched and the power goes to the load. 73 Tom From lwbyppp@epix.net Fri Jan 12 14:05:29 1996 Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!netnews.nwnet.net!news.ohsu.edu!steele!ashleyb From: Bradford Ashley Newsgroups: rec.radio.amateur.antenna Subject: Re: HF antenna for Apartment Dweller Date: Tue, 9 Jan 1996 08:43:55 -0800 Organization: Oregon Health Sciences University Lines: 8 Message-ID: References: <199601090258.SAA24945@netcom5.netcom.com> NNTP-Posting-Host: 137.53.1.40 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: ashleyb@steele In-Reply-To: <199601090258.SAA24945@netcom5.netcom.com> Thanks alot for the info. I am currentil limited to a 10m RS HTX-100 with 25w PEP SSB and a small dipole out on my deck parallel to my deck and neighbors. From what you say I consider myself lucky they have said anythig yet. I'll try to put your info to good use. Thanks for your Time Brad WB7TSO From lwbyppp@epix.net Fri Jan 12 14:05:30 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!psgrain!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!usc!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: David Stockton Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Tue, 9 Jan 1996 09:52:40 GMT References: <4ch5ls$jr4@flood.weeg.uiowa.edu> Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland Lines: 27 sabinw@crpl.cedar-rapids.lib.ia.us wrote: : To David Stockton: : Nice to hear your comments, David. Oh, gosh, well, um, er Bill, I believe I saw mention of the low cost Collins 455kHz mech filters in something you wrote, with a figure of $77 nearby. Any chance of some details ? A friend is about to design a transceiver and was contemplating a 455kHz final IF, but was put off by the lack of any CW- appropriate bandwidth in the usual ceramic filters. I suggested that it would be attractice to lay boards out to take either the ceramic cheapies or the current Collins series so that builders would have an upgrade path. With the norm being UK distributors DOUBLING the prices of parts and equipment, he would use his contacts to buy from US sources. (Funnily enough UK manufacturers sell their wares cheaper to US customers than they do to UK customers - comparing before-tax prices. A colleague was interested in a british designed and made DSP card for a PC. He could get it cheaper from the US distributor, including paying import duty and tax on bringing it back into the UK) Cheers, David GM4ZNX From lwbyppp@epix.net Fri Jan 12 14:05:31 1996 Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.antenna Subject: WG: Re: Scanner antenna 26-1300MHz Date: 9 Jan 96 17:44:00 GMT Organization: ucsd usenet gateway Lines: 21 Message-ID: <30F2AA1C@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu ---------- Von: Koellner, Guenter An: owner-ham-ant Betreff: Re: Scanner antenna 26-1300MHz Datum: Donnerstag, 19. Oktober 1995 07:59 Hello, somebody asked for a scanner antenna. I just ordered an antenna from an italian producer: ALAN T-735. This antenna is a discone type but extended to cover 26-1300MHz, with transmission optimization for 28, 144, 220, 432, 900 and 1300MHz. At least, the price is low, abt. $75 here in Germany, where prices normally are 1.5 times higher than stateside. vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) KOELLNER@SCN.DE (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) UO-22, KO-23 & KO-25 (Pacsats) From lwbyppp@epix.net Fri Jan 12 14:05:32 1996 Path: news.epix.net!news.sprintlink.net!vulcan.netdepot.com!europa05.netdepot.com!user From: charlie@netdepot.com (Charlie Fortner) Newsgroups: rec.radio.amateur.antenna Subject: angle of ground plane radials???? Date: Tue, 09 Jan 1996 19:29:27 -0500 Lines: 4 Message-ID: NNTP-Posting-Host: europa05.netdepot.com X-Newsreader: Yet Another NewsWatcher 2.1.3 I've seen plans for 2m using a SO-239 and some copper rods. The instructions say to bend the rods at a 45 degree angle towards the ground. I've seen commercially made 2m antennas that don't have bent radials. What does the angle of the radials do for the signal? From lwbyppp@epix.net Fri Jan 12 14:05:33 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.netins.net!newsrelay.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: Frank Scutch Subject: Any info on Bilal Isotron Antenna? Content-Type: text/plain; charset=us-ascii Organization: Motorola, Inc. Date: Tue, 9 Jan 1996 20:10:49 GMT Message-ID: <1996Jan9.201049.7665@schbbs.mot.com> X-Mailer: Mozilla 1.1 (Macintosh; U; 68K) Mime-Version: 1.0 X-Url: news:rec.radio.amateur.antenna Content-Transfer-Encoding: 7bit Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 145.2.91.88 Lines: 9 Does anyone have any experience with an Isotron antenna? This is the one which looks much like a bird feeder. I was thinking about trying one of these on 160? I noticed someone mentioned on another post that the antenna was a "dog" on 80 meters. I use a KLM 160V 160m vertical now but was looking for another limited space alternative. Frank, WB4AYJ From lwbyppp@epix.net Fri Jan 12 14:05:34 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Poor Stereo Reception Local? Date: 9 Jan 1996 22:04:43 GMT Organization: LI Net (Long Island Network) Lines: 13 Message-ID: <4cuopr$jaf@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] Two things: I checked the current stock at Radio Shack, and they have an adjustable attenuator, but their FM filter * removes * FM frequencies for better TV reception. I guess I remembered wrong... Second, are you sure your desired station comes from the World Trade Center? Maybe it was near your old home, or even on the other side from Manhattan, and you moved further away from it, and now you're too far away. If you get the NYC stations OK, but not your old favorite, maybe that's the problem. Bob Bruhns, WA3WDR, bbruhns@li.net From lwbyppp@epix.net Fri Jan 12 14:05:35 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.antenna Subject: ? Circular Polarisation Date: 9 Jan 96 22:39:00 GMT Organization: ucsd usenet gateway Lines: 24 Message-ID: <30F2EEBC@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hello! I have two questions: 1) If I take two identical antennas, one horizontal, one vertical, mounted without any forward offest mounted about 1 wavelenth parallel to each other, what must be done to make them to produce left- and right-hand circular polarisation? One thing to mention is matching the impedance, and the other is to feed one antenna a quarter wavelenth later. But under which circumstances which rotation direction will happen? 2) If I mount both antennas on the same boom this would not be possible without adding a forward offset (lets say, 2-5cm is possible). What must be done then? I expect the feedlength difference must be corrected, but which value? I think it could not be (2-5cm)*velocitiy_factor, as I expect the wave speed within the antenna directors field is not equal to the speed of light. Please answer with Email as well as to the board. Thanks a lot in advance! vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) DL4MEA@AMSAT.ORG (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) From lwbyppp@epix.net Fri Jan 12 14:05:36 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!usenet.eel.ufl.edu!freenet2.freenet.ufl.edu!afn17891 From: "Thomas W. Castle" Newsgroups: rec.radio.amateur.antenna Subject: Re: angle of ground plane radials???? Date: Wed, 10 Jan 1996 00:31:52 -0500 Lines: 21 Message-ID: References: NNTP-Posting-Host: freenet2.afn.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: afn17891@freenet2.freenet.ufl.edu In-Reply-To: On Tue, 9 Jan 1996, Charlie Fortner wrote: > I've seen plans for 2m using a SO-239 and some copper rods. The > instructions say to bend the rods at a 45 degree angle towards the > ground. I've seen commercially made 2m antennas that don't have bent > radials. What does the angle of the radials do for the signal? The easiest way for me to explain it is: the 45 degree angle is to make the typical home brew 1/4wave antenna come out to around 50ohm impedance. I am sure a lot of other people will come out with other opinions but if: you use an antenna analyzer to check the resistance with the radials straight out as compared to 45 degrees you will see the difference. If the length of the center radial is cut to a given freq. an the radials are of the proper length an angle - you will have a antenna that is resonant at the given freq with 50 ohm impedance an a reasonably good SWR. The commercially made antennas usually have a different length on the horizontal radials in order to get the proper impedance. Hope this helps a little De Tom KD4QHH From lwbyppp@epix.net Fri Jan 12 14:05:37 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.antenna Subject: Re: How to build best antenna? Date: 10 Jan 1996 00:44:39 GMT Organization: SRC Lines: 16 Message-ID: <4cv26a$9sc@news.iii.net> References: <4cslsl$1gn@mark.ucdavis.edu> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: ctbaker@taco.engr.ucdavis.edu Well Chad, Not to rain on your parade but... The first rule of a high performance antenna is: Get it HIGH! If not high, make it BIG, If not high or big, expect less. Sorry, your expectations will not be meet. But now that I've said that, try stuff, like a wire log-periodic in the rafters. Don't give up because I say so, I've been wrong before, (I remember, it was last year... I was mistaken.) Tom WA1RHP From lwbyppp@epix.net Fri Jan 12 14:05:38 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!intac!usenet From: Mark Herson Newsgroups: rec.radio.amateur.antenna Subject: Re: angle of ground plane radials???? Date: 10 Jan 1996 01:35:58 GMT Organization: INTAC Access Corporation - An Internet Service Provider Lines: 20 Message-ID: <4cv55v$3qf@uucp.intac.com> References: NNTP-Posting-Host: hudson.intac.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: charlie@netdepot.com,mherson@intac.com charlie@netdepot.com (Charlie Fortner) wrote: >I've seen plans for 2m using a SO-239 and some copper rods. The >instructions say to bend the rods at a 45 degree angle towards the >ground. I've seen commercially made 2m antennas that don't have bent >radials. What does the angle of the radials do for the signal? Charlie, I don't think the angle of the radials will do anthing for your signal. However, it does give a better match to 50 ohms. With the radials straight out, you're looking at 30ish ohms (similar to a vertical on the ground) and with them straight down, it's 70ish ohms (basically a vertical dipole). Guess the bottom line is to adjust the angle for the best swr. 73, Mark, N2MH From lwbyppp@epix.net Fri Jan 12 14:05:39 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: n3ntjmatt@aol.com (N3NTJMatt) Newsgroups: rec.radio.amateur.antenna Subject: tuner problem Date: 10 Jan 1996 02:08:10 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <4cvokq$jv3@newsbf02.news.aol.com> Reply-To: n3ntjmatt@aol.com (N3NTJMatt) Hi all.. Does anyone know of a Kenwood auto tuner problem? I know of a rig that will draw lots of current when you get to 20 thru 10 m and the AT will not tune for about 5 or 10 min. Then, it is fine. On 40 and 80m there is no problem. Has anyone ever heard of this problem or know what it may be? I am think the tuner but I dunno. Also, any good, fast Kenwood service areas near Cleveland or Pittsburgh? thx and 73s Matt N3NTJ n3ntjmatt@aol.com From lwbyppp@epix.net Fri Jan 12 14:05:40 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!solaris.cc.vt.edu!uunet!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-center fed dipole? Date: 10 Jan 1996 02:32:54 GMT Organization: Intel Corporation, Chandler, AZ Lines: 52 Distribution: world Message-ID: <4cv8gm$11dl@chnews.ch.intel.com> References: <4c2cso$8g7@news3.digex.net> <4cenjl$lnl@chnews.ch.intel.com> <4csdl3$57p@buffnet2.buffnet.net> NNTP-Posting-Host: scorpion.ch.intel.com In article <4csdl3$57p@buffnet2.buffnet.net>, david james wrote: >So where exactly (38 feet from feed point .. or what) is the cap. >Maybe a diagram ?? Hi David, In each half-wavelength of feedline, there are 4 near- magic points where a stub, cap, or inductor can be attached to kill the reflections. Once the reflections are killed at that point, it doesn't matter (within reason) how far it is from that point to the transmitter as the SWR is 1:1 and the line is flat. At the transmitter end, one really cannot tell it from a 300 ohm folded dipole with a 1:1 SWR. My antenna is the G5RV standard dipole length of 102 ft. It is 30 ft. high fed with 300 ohm ladder-line. No two antennas are identical so take the "where exactly" with a grain of salt. Given the 70-j300 ohm impedance of my 102 ft. dipole on 3.7 MHz, a parallel inductor or a shorted stub can be put at 15.8 ft from the antenna to kill the reflections. That point is not convenient for me. So I chose the next possible point which is a parallel 270 pf cap 36.5 ft from the antenna. The third "magic" point is 68.5 ft from the antenna where two 100pf series caps will do the trick. The forth point is at 89 ft from the antenna where two series inductors will work. For 40m, a 6 ft shorted stub placed in parallel at 82 feet from the antenna does the job. Obviously, the 75m caps must be removed for 40m operation and the 40m stub removed for 75m operation. At least I think so - I haven't calculated the effects. Sometimes, Murphey is on vacation and one extra stub will not appreciably affect the overall results especially if one simply removes the jumper from a shorted stub turning it into a high-impedance open stub. I roasted 6kv ceramic caps with 600 watts so use door-knobs, HV micas, or vacuum caps at the higher powers. The flat (both ways) 300 ohm line is brought to a 4:1 balun which drops the impedance to 75 ohms or less giving a maximum SWR of 1.5:1 at 50 ohms which makes either the tuner or the transmitter happy. The tuner is designed to be efficient at those impedances. My SB-201 matches them perfectly and so does my MFJ-949. My signal reports have improved greatly since my tuner is happy. First contact with the tuned 40m system was from AZ to GA using 100w at night with 5x9 reports both ways. My non-resonant length antenna turns in an SWR of less than 1.5:1 on *all* the HF bands without an antenna tuner. How 'bout that, Jack? Enjoy and 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Fri Jan 12 14:05:42 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!portal.gmu.edu!news From: cshelton@gmu.edu (Jeff Shelton) Newsgroups: rec.radio.amateur.antenna Subject: Re: Are Bilal Isotron antennas any good? Date: Wed, 10 Jan 1996 03:08:34 GMT Organization: George Mason University, Fairfax, Virginia, USA Lines: 21 Message-ID: <4cvakr$s34@portal.gmu.edu> References: <4ce267$oqo@newsbf02.news.aol.com> NNTP-Posting-Host: osf1.gmu.edu Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Newsreader: Forte Free Agent 1.0.82 zaax@aol.com (ZaaX) wrote: >I would like to hear from anyone that owns a Bilal Isotron antenna. I've got an Isotron 40, and think well of it as a LIMITED SPACE antenna. It can't compete with a full size dipole or a good vertical (despite ad claims), but I can't put an R7 in my attic. I have found that the Isotron is MUCH better than the various mobile whips, random wires, or tuned rain gutters I've used prior to getting the Isotron. I also got a Isotron 20, but have had little chance to test it out, as when I can get on the radio, 20 has usually shut down for the night. Be aware that setting the resonant point on an Isotron is something of a hassle, especially for 40/80/160. If you can borrow an antenna analyzer or noise bridge, it's a lot easier, though you can do it with just a xcvr and SWR meter -- eventually. Bilal is very good about helping over the phone if you need it. Jeff Shelton KS4TL From lwbyppp@epix.net Fri Jan 12 14:05:44 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new article Date: 10 Jan 1996 06:32:26 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 76 Sender: root@newsbf02.news.aol.com Message-ID: <4d084a$oue@newsbf02.news.aol.com> References: <199601091344.HAA17524@tri.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Lawrence, In article <199601091344.HAA17524@tri.net>, stoskopf@tri.NET (Lawrence Stoskopf) writes: >He also refers to an article I've filed away and nearly forgotten: Using >Elevated Radials with Ground Mounted Towers by KB8I in Sept 91, pp 77-82 IEE >Trans on Broadcasting. ".. it is possible to use four elevated radials >together with a conventional ground-mounted, base-insulated tower for MF >broadcasting purposes, and achieve the same level of performance which is >normally obtained from a classic 120-buried-radial system." This from NEC >simulation. >"Do not place radials on or below the ground unless there is space for some >120 radials and the site has good ground conductivity;(with poor ground >conductivity it is useful regularly to water the ground!" >Hawker's final comments: >"VK1BRH emphasises that simulated results are only as good as the computer >program. However he considers that NEC-81 is good at modelling linear >antennas close to lossy ground. It has been validated numerous times but, >even so, it has failed even more times due to inappropriate use." Wher is the validation at? I can't find any, can anyone else? ALL the data I find tends to ***disprove*** NEC's accuracy with any horizontal wire below .1 WL or so!!!!!!!! >My wish list: >1. A good review article going back to the original Brown articles. >2. A meta-analysis of data already published. (A technique in which you >combine a whole batch of statistically insignificant data to hopefully make >it statistically significant) > >3. A rework of the Doty model with corrections and field strength >measurements. HARD COLD FACTS: 1.) When I actually measured the FS from a 80 meter vertical with four elevated radials, FS was around five dB down from the same antenna with ~60 1/4 wl radials. When I measured ~60 radials elevated or on the ground, there was NO difference between the two systems. 2.) When one of the main supporters of elevated radials actually measured an elevated radial antenna (in crude form) it was a few dB down from predictions. 3.) When a low dipole was actually measured (a full pattern proof done in helicopters) and compared to NEC-2 there was a 4 or 5 dB shortfall from NEC's predictions. 4.) AM BCB station WVNJ has six elevated radials and a full proof revealed the signal is 5 or 6 dB down from NEC models. They are now installing a conventional system. 5.) Other broadcast stations appear to have a similar shortfall in signal when using elevated radials. 6.) When I measure the current taper in a low horizontal wire and compare it to NEC-4 models there is a large error. The actual current tapers much faster than NEC predicts because of ground related losses! The true advantage to elevated radials? Putting up the antenna is a bit easier. ;-) 73 Tom From lwbyppp@epix.net Fri Jan 12 14:05:45 1996 Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci2!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 10 Jan 1996 06:32:46 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 19 Sender: root@newsbf02.news.aol.com Message-ID: <4d084u$oun@newsbf02.news.aol.com> References: <4cuduv$11g5@chnews.ch.intel.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4cuduv$11g5@chnews.ch.intel.com>, cmoore@scorpion.ch.intel.com (Cecil A. Moore~) writes: > >Kurt, I'll bet you $100 that your antenna is not a perfect >circle and that your claim is exaggerated exactly like the >claims of the antenna manufacturers you love to criticize. > > Cecil, You could write him directly, but we all know what happens when you disagree with the person who has his hand on the off-on switch. But I seem to recall a West Coast fellow inviting people to write ole Stuper....errrrr ole Sterba. Or do you fear the response would be another example of "we told you how it is, and so it must be"? 73 Tom From lwbyppp@epix.net Fri Jan 12 14:05:47 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: Paul Moller Subject: Re: ? Circular Polarisation Content-Type: text/plain; charset=us-ascii Organization: MOTOROLA Date: Wed, 10 Jan 1996 09:19:13 -0600 Message-ID: <30F3D8F1.2328@csg.mot.com> To: "Koellner, Guenter" X-Mailer: Mozilla 2.0b3 (Win95; I) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit References: <30F2EEBC@SmtpGate.Oen1.Oen.Siemens.De> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 144.188.36.8 Lines: 59 Koellner, Guenter wrote: > > Hello! > > I have two questions: > > 1) If I take two identical antennas, one horizontal, one vertical, mounted > without any forward offest mounted about 1 wavelenth parallel to each > other, what must be done to make them to produce left- and right-hand > circular polarisation? One thing to mention is matching the impedance, > and the other is to feed one antenna a quarter wavelenth later. But > under which circumstances which rotation direction will happen? > Circular polarization will occur when the phase relationship of the two antennas is 90 degrees offset in the far field. In this case since they are identical antennas, the feed only need be seperated by 90 degrees. In the far field one cannot discern between the two directional antennas placed close to each other but still seperated. Treat them as if they were co-located on the same boom. Now, however, there is a problem! Chances are the antennas do not have the same azmith and elevation patterns, after all few if any yagis do. This is a general statement about co-locating yagis and using them to generate circular polarization, not necessarily about this side by side arrangement. > 2) If I mount both antennas on the same boom this would not be possible > without adding a forward offset (lets say, 2-5cm is possible). What > must be done then? I expect the feedlength difference must be corrected, > but which value? I think it could not be (2-5cm)*velocitiy_factor, as I > expect the wave speed within the antenna directors field is not equal > to the speed of light. > > Please answer with Email as well as to the board. Thanks a lot in advance! > This is another good question. Like I said above, all you need is 90 degrees phase shilft in the far field. I have a similar situation and here is my plan: To construct and install the antennas each with their own feed and cable. Then in the shack I can choose horizontal, vertical, or circular by means of a coax switch arrangement. Horizontal or vertical are easy as all you do is choose one antenna. Circular is also easy as all you do is use a splitter or transformenr to match the impedance, and then feed them with 90 degree phase shift. The question is how to determine when you have 90 degrees. I plan to build a turnstile with a ground plane 1/4 wavelength below it to use as a reference. Since this will be for experimental purposes only, it will be crudely constructed and be near ground mounted only. The "circular" yagis can then be pointed at the turnstile, watching for nearby obstructions, and a line strecher can be inserted in one of the yagi feeds and adjusted to give maximum coupling between the yagis and turnstile. A piece of coax can then be cut and replace the line strecher for a permanent installation. (I will have to borrow the line strecher). Make sure to watch your left and right c.p. on the turnstile, as you could get it backwards if not careful! Good luck. > vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) > DL4MEA@AMSAT.ORG (Internet) > HTTP://WWW.SCN.DE/~KOELLNER (WWW) From lwbyppp@epix.net Fri Jan 12 14:05:48 1996 Path: news.epix.net!news.sprintlink.net!ns.mad.servicom.es!ns.bcn.servicom.es!news From: "Jordi C." Newsgroups: rec.radio.amateur.antenna Subject: test dont't read it. Date: 10 Jan 1996 09:23:26 GMT Organization: SERVICOM Lines: 2 Message-ID: <4d00ie$k19@ns.bcn.servicom.es> NNTP-Posting-Host: ppp_11.bcn.servicom.es Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: news:rec.radio test test test From lwbyppp@epix.net Fri Jan 12 14:05:49 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: Paul Moller Subject: Re: ? Circular Polarisation Content-Type: text/plain; charset=us-ascii Organization: MOTOROLA Date: Wed, 10 Jan 1996 09:36:28 -0600 Message-ID: <30F3DCFC.4259@csg.mot.com> To: "Koellner, Guenter" X-Mailer: Mozilla 2.0b3 (Win95; I) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit References: <30F2EEBC@SmtpGate.Oen1.Oen.Siemens.De> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 144.188.36.8 Lines: 59 Koellner, Guenter wrote: > > Hello! > > I have two questions: > > 1) If I take two identical antennas, one horizontal, one vertical, mounted > without any forward offest mounted about 1 wavelenth parallel to each > other, what must be done to make them to produce left- and right-hand > circular polarisation? One thing to mention is matching the impedance, > and the other is to feed one antenna a quarter wavelenth later. But > under which circumstances which rotation direction will happen? > Circular polarization will occur when the phase relationship of the two antennas is 90 degrees offset in the far field. In this case since they are identical antennas, the feed only need be seperated by 90 degrees. In the far field one cannot discern between the two directional antennas placed close to each other but still seperated. Treat them as if they were co-located on the same boom. Now, however, there is a problem! Chances are the antennas do not have the same azmith and elevation patterns, after all few if any yagis do. This is a general statement about co-locating yagis and using them to generate circular polarization, not necessarily about this side by side arrangement. > 2) If I mount both antennas on the same boom this would not be possible > without adding a forward offset (lets say, 2-5cm is possible). What > must be done then? I expect the feedlength difference must be corrected, > but which value? I think it could not be (2-5cm)*velocitiy_factor, as I > expect the wave speed within the antenna directors field is not equal > to the speed of light. > > Please answer with Email as well as to the board. Thanks a lot in advance! > This is another good question. Like I said above, all you need is 90 degrees phase shilft in the far field. I have a similar situation and here is my plan: To construct and install the antennas each with their own feed and cable. Then in the shack I can choose horizontal, vertical, or circular by means of a coax switch arrangement. Horizontal or vertical are easy as all you do is choose one antenna. Circular is also easy as all you do is use a splitter or transformenr to match the impedance, and then feed them with 90 degree phase shift. The question is how to determine when you have 90 degrees. I plan to build a turnstile with a ground plane 1/4 wavelength below it to use as a reference. Since this will be for experimental purposes only, it will be crudely constructed and be near ground mounted only. The "circular" yagis can then be pointed at the turnstile, watching for nearby obstructions, and a line strecher can be inserted in one of the yagi feeds and adjusted to give maximum coupling between the yagis and turnstile. A piece of coax can then be cut and replace the line strecher for a permanent installation. (I will have to borrow the line strecher). Make sure to watch your left and right c.p. on the turnstile, as you could get it backwards if not careful! Good luck. > vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) > DL4MEA@AMSAT.ORG (Internet) > HTTP://WWW.SCN.DE/~KOELLNER (WWW) From lwbyppp@epix.net Fri Jan 12 14:05:51 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in1.uu.net!nntp.cadence.com!news From: Neil Whiting Subject: (no subject) Content-Type: text/plain; charset=us-ascii Message-ID: <30F3BF98.41C67EA6@cadence.com> Sender: news@Cadence.COM Content-Transfer-Encoding: 7bit Organization: Cadence Spectrum Services Mime-Version: 1.0 Date: Wed, 10 Jan 1996 13:31:04 GMT X-Mailer: Mozilla 2.0b5 (X11; I; SunOS 4.1.3_U1 sun4m) Lines: 40 Tom Bruhns wrote: > > Wendy Wing Chi Cheung (cheungw@solomon.sce.carleton.ca) wrote: > : I have a question about antenna simulation programs in > : general. Does anyone here collect information about most of the > : antenna simulation programs that exist? I am doing a quick > > Have a look in back issues of QST. I think it was sometime in > Spring, 1995, that they published a comparison of EZNEC from Roy > Lewallen and the suite of programs from Brian Beezley (sp?). I > would suggest that you also look at NECWIN -- I think I got it > right this time -- from an outfit in Pennsylvania. It's similar > to EZNEC but windows rather than DOS based. I personally have > a license for EZNEC and find it quite worthwhile. My biggest > wish, I guess, for these programs that wrap a nice human interface > around NEC2 is that they include access to the surface modelling > available in NEC2. As far as I know, they all limit you to > modelling wires; patch antennas are rather difficult. > > 73, K7ITM Tom Bruhns wrote: > > Wendy Wing Chi Cheung (cheungw@solomon.sce.carleton.ca) wrote: > : I have a question about antenna simulation programs in > : general. Does anyone here collect information about most of the > : antenna simulation programs that exist? I am doing a quick > > Have a look in back issues of QST. I think it was sometime in > Spring, 1995, that they published a comparison of EZNEC from Roy > Lewallen and the suite of programs from Brian Beezley (sp?). I > would suggest that you also look at NECWIN -- I think I got it > right this time -- from an outfit in Pennsylvania. It's similar > to EZNEC but windows rather than DOS based. I personally have > a license for EZNEC and find it quite worthwhile. My biggest > wish, I guess, for these programs that wrap a nice human interface > around NEC2 is that they include access to the surface modelling > available in NEC2. As far as I know, they all limit you to > modelling wires; patch antennas are rather difficult. > > 73, K7ITM From lwbyppp@epix.net Fri Jan 12 14:05:52 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!news.cais.com!cais3.cais.com!builder From: Neil Fox Newsgroups: rec.radio.amateur.antenna Subject: Re: Arrival angles Date: Wed, 10 Jan 1996 13:43:49 -0500 Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 9 Message-ID: References: <4ceu31$90l@argentina.it.earthlink.net> NNTP-Posting-Host: cais3.cais.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: builder@cais3.cais.com In-Reply-To: <4ceu31$90l@argentina.it.earthlink.net> Now that's a challange! You may only be able to tell if the signal is generally to the "left" or the "right." As for the type of antenna, a massive beam antenna is ideal, but perhaps not practical. There are loop antennas you may want to consider. They are made for direction finding, and can be constructed for HF. 73 Neil WA4DXC From lwbyppp@epix.net Fri Jan 12 14:05:53 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.antenna Subject: ? Circular Polarisation Date: 10 Jan 96 18:48:00 GMT Organization: ucsd usenet gateway Lines: 37 Message-ID: <01HZUIRIGWKI00949C@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu 9 Jan 96 22:39:00 GMT guenter.koellner@oen.siemens.DE (Koellner, Guenter) writes: -1) If I take two identical antennas, one horizontal, one vertical, mounted - without any forward offest mounted about 1 wavelenth parallel to each - other, what must be done to make them to produce left- and right-hand - circular polarisation? One thing to mention is matching the impedance, - and the other is to feed one antenna a quarter wavelenth later. But - under which circumstances which rotation direction will happen? This will work fine. What you also need is a way to reverse the polarization if you need to do so. The way I've seen this done is by mounting the two antennas on the same boom. You connect a quarter wave (less velocity factor) of RG-11 coax to each yagi. Each of the free ends is connected to a separate T-connector. The other side of each of the T-connectors is connected together with some 95 ohm coax such as RG-133. In other words you come from yagi 1 with RG-11 to one side of T-connector 1, you go from the other side of T-connector 1 with RG-133 to side 1 of T-connector 2. You connect side 2 of T-connector 2 to the other yagi with RG-11. The 50 ohm coax from your rig is connect to one or the other T-connectors depending on whether you want left-hand or right-hand polarization. <2 snipped> If you want true circular polarization you will need to build a helical antenna. These things become prohibitively large at anything below 220MHz. The reflective grid must be 1 wavelength square (6 feet or so at 2 meters.) If you want decent gain you must have six to eight turns, each one wavelength long with a quarter wavelength pitch. Hope this helps Kevin, WB5RUE muenzlerk@uthscsa.edu From lwbyppp@epix.net Fri Jan 12 14:05:54 1996 Path: news.epix.net!news.sprintlink.net!everest.pinn.net!everest!pridgent From: pridgent@pinn.net (Terry Pridgen) Newsgroups: rec.radio.amateur.antenna Subject: 6 mtr Antenna Plans Date: 10 Jan 1996 19:02:35 GMT Organization: Pinnacle Online - Internet access for Hampton Roads, Virginia - 490-4509 Lines: 7 Message-ID: <4d12gb$ko0@everest.pinn.net> NNTP-Posting-Host: everest.pinn.net X-Newsreader: TIN [version 1.2 PL2] Looking for simple construction plans for a 6 meter j-pole and other 6 meter antennas. Please respond to: pridgent@pinn.net 73, KC4YTF -- From lwbyppp@epix.net Fri Jan 12 14:05:55 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: Arrival angles Date: 10 Jan 1996 20:07:21 GMT Organization: Hewlett Packard Corvallis Site Lines: 26 Message-ID: <4d169p$grd@hpcvsnz.cv.hp.com> References: <4cglbk$m5r@newsbf02.news.aol.com> NNTP-Posting-Host: hplsnb.lsid.hp.com W8JI Tom (w8jitom@aol.com) wrote: : In article <4ceu31$90l@argentina.it.earthlink.net>, JLB@earthlink.net (Joe : Bulger) writes: : >Does anyone know of an antenna that is used to measure arrival angles of : >HF signals? I would like to be able to readout arrival angles of signals : >on 160M. : Try a loop or ferrite rod antenna. I'll second that. As a trivial experiment to prove to yourself that it works, tune a broadcast portable radio (with ferrite rod antenna) to a strong station (near the high end of the band). Turn it in both azimuth AND elevation; you should find a null the depth of which depends mainly on how steady you can hold the radio, and the stability of the environment. Don't be surprised if you get a null deeper than 80dB, sensitive to changes of angle of less than a degree. There's a directional ambiguity that can be resolved by using an additional short "whip" antenna, if you need to. (It's possible to use this technique to listen to a weak broadcast station in the presence of a stronger one on the same frequency, if the signals are coming from different enough directions.) -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Fri Jan 12 14:05:56 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,comp.security.unix,de.comp.security Subject: TSCM Counter Surveillance & Technical Security Page Date: Wed, 10 Jan 1996 20:20:24 -0500 Organization: tscm.com Lines: 21 Message-ID: Reply-To: jmatk@tscm.com NNTP-Posting-Host: jmatk.tiac.net Keywords: Counterintelligence Debugging Surviellance Counter-Terrorism X-Newsreader: Yet Another NewsWatcher 2.1.3 Xref: news.epix.net rec.radio.amateur.antenna:18372 rec.radio.amateur.equipment:23619 rec.radio.amateur.misc:96764 comp.security.unix:23372 de.comp.security:3663 We now have over 600 pages of materials on-line, over 200 photographs, hundreds of frequencies... and we're growing rapidly http://www.tscm.com/ Detailed listing of tools Comprehensive reviews of TSCM equipment Huge Publications listing Comments on TSCM training courses =============================================================== James M. Atkinson "...Shaken, not Stirred..." TSCM.COM 127 Eastern Avenue #291 Gloucester, MA 01931-8008 URL: http://www.tscm.com/ E-Mail: jmatk@tscm.com =============================================================== The First, The Largest, The Most Popular, and the Most Complete TSCM Counterintelligence Site on the Internet =============================================================== From lwbyppp@epix.net Fri Jan 12 14:05:57 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hpuerci.atl.hp.com!news From: Rahul Patel Newsgroups: rec.radio.amateur.antenna Subject: Need Mod for TR-7850 Kenwood 2m Date: 10 Jan 1996 20:35:21 GMT Organization: HEWLETT-PACKARD CO. Lines: 7 Distribution: world Message-ID: <4d17u9$lu5@hpuerci.atl.hp.com> NNTP-Posting-Host: f3142rhp.ssr.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) If anyone has any mod's for my Kenwood TR-7850 2m mobile radio, I would be ver y grateful if you can send me a message. Thanking you in advance. 73, Rahul Patel - N4RWZ From lwbyppp@epix.net Fri Jan 12 14:05:58 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!firefly!kf8zn From: kf8zn@prairienet.org Newsgroups: rec.radio.amateur.antenna Subject: Re: Continuous loaded verticals? Date: 10 Jan 1996 22:17:07 GMT Organization: University of Illinois at Urbana Lines: 5 Message-ID: <4d1dt3$iln@vixen.cso.uiuc.edu> NNTP-Posting-Host: firefly.prairienet.org Would like SPECIFIC info from anyone using continuous (helical wind) verticals on 160m. Please describe height, winding spacing, matching network, radial system etc. Your help is appreciated!!! Mike kf8zn From lwbyppp@epix.net Fri Jan 12 14:05:59 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!van-bc!uniserve!news.uniserve.com!usenet From: Jeff Newsgroups: rec.radio.amateur.antenna Subject: Re: What kind of HF antena using space of apartment's balconi? Date: 11 Jan 1996 00:34:32 GMT Organization: UNIServe Lines: 11 Message-ID: <4d1luo$bu5@enigma.uniserve.com> NNTP-Posting-Host: van0111.tvs.net ykoc2@ocmp.sk.co.kr (Gun Kim) writes: > Hellow! > I'm biginner of amateur radio,in South Korea. > I have 2m and HF all band Rig. > But I am in a difficulty to construct antena system. > I need information for using apartment's balconi. > > thanks, > DE DS1AFL 73~~ > From lwbyppp@epix.net Fri Jan 12 14:06:00 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!csulb.edu!drivel.ics.uci.edu!news.service.uci.edu!usenet From: shreeve@meded.med.uci.edu (Steve Shreeve) Newsgroups: rec.radio.amateur.antenna Subject: Antenna for Radio Shack CB? TRC-225 Date: Thu, 11 Jan 1996 00:40:12 -400 Organization: UC Irvine Medical School Lines: 8 Message-ID: <4d2icd$ile@news.service.uci.edu> NNTP-Posting-Host: pal-ts2-037.slip.uci.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NewsReader: QNews v0.9b3 Beta 14 Apr 1994 Evaluation copy. Radio Gurus, I purchased 2 Radio Shack TRC-225 hand-held 5 watt CB's which claim to have a range of several miles (even with the standard flexible antenna). However, when I use the CB's I can scarcely get 100 yards before the transmission is nearly dead. What's the deal? (Yes, I'm using fresh batteries). Is the standard antenna THAT bad, that I need an "extendo"-antenna for any respectable transmission? From lwbyppp@epix.net Fri Jan 12 14:06:01 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: bilbee@aol.com (Bilbee) Newsgroups: rec.radio.amateur.antenna Subject: Bike touring and ham radio? Date: 11 Jan 1996 02:19:16 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <4d2dlk$leg@newsbf02.news.aol.com> Reply-To: bilbee@aol.com (Bilbee) Can one be a ham radio antenna nerd and be into the exciting world of bicycle touring at the same time? A resounding yes. I'm looking for a few good men and women to join the annual bike tour along the Pacific Crest Bicycle Trail this summer, from Lake Tahoe, CA thru Yosemite to Sequoia Nat. Park. A weeklong trip involving rigorous touring with a limit of 10 riders. Everyone is self-supported and there is no charge. Touring hams help keep HT communications between parts of the group and some of us do QRP HF along the way, too. Date not yet set. If interested e-mail me at bilbee@aol.com and supply your postal address and phone number (and callsign) and I'll put you on the mailing list. 73. -- Bil Paul KD6JUI, San Mateo, CA (organizer of author of Trail guidebook) From lwbyppp@epix.net Fri Jan 12 14:06:01 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!milano!news-relay.us.dell.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: s51fu@ljutcp.hamradio.si Newsgroups: rec.radio.amateur.antenna Subject: [Q]: Diffraction loss calculation? Date: 11 Jan 96 03:08:55 GMT Organization: ucsd usenet gateway Lines: 6 Message-ID: <121831@ljutcp.hamradio.si> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Can somebody shoot me the formulas and/or basic algorithms for Diffraction over obstacles and irregular terrain radio path loss calculation? Any relating computer basic program known? Your assistance is much appreciated! Thanks, Danilo + From lwbyppp@epix.net Fri Jan 12 14:06:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!news00.sunet.se!sunic!nntp.coast.net!news.dacom.co.kr!news.netins.net!usenet From: crcarlson@netins.net Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 11 Jan 1996 04:17:25 GMT Organization: INS Information Services, Des Moines, IA USA Lines: 35 Distribution: world Message-ID: <0099C332.160AE597@netins.net> References: <4cuduv$11g5@chnews.ch.intel.com> Reply-To: crcarlson@netins.net NNTP-Posting-Host: ins.netins.net In article <4cuduv$11g5@chnews.ch.intel.com>, cmoore@scorpion.ch.intel.com (Ce cil A. Moore~) writes: >In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna >manufacturers for making outrageous claims and then turns >around and makes an outrageous claim for his own antenna. > >"I fully know that the triangle will be some ... fraction of >a dB down from a square. I myself run mine in the form of a >perfect circle." > >Wow, "a perfect circle". An antenna whose height above ground >does not vary by even an infinitesimal amount and whose diameter >does not vary by even an infinitesimal amount. Sterba must be >the only person in the universe with "a perfect circle" antenna. > *parts removed* >also has perfect wire or else it wouldn't be "a perfect circle". >Dang, the man and everything around him must be perfect. > >Kurt, I'll bet you $100 that your antenna is not a perfect >circle and that your claim is exaggerated exactly like the >claims of the antenna manufacturers you love to criticize. > >73, Cecil, KG7BK, OOTC (not speaking for my employer) I have trouble believing that a guy who writes about tuning up garbage cans, grocery carts and beer can verticals and who rounds all his d.b. figures to th e nearest whole number REALLY believes he operates a "perfect circle" antenna, except to mention it "tongue-in-cheek". This is his writing style: th at of a self-deprecating ironic sarcasm. No offense intended (I mean that!) but you gotta get out of the laboratory and into an English lit course. Peace. From lwbyppp@epix.net Fri Jan 12 14:06:04 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!usenet.ins.cwru.edu!gatech!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!tribune.usask.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03 From: VE4KLM Newsgroups: rec.radio.amateur.antenna Subject: E.J. Sterba Article of July 1931 ? Date: Thu, 11 Jan 1996 10:43:20 -0600 Organization: The University of Manitoba Lines: 17 Message-ID: NNTP-Posting-Host: access.mbnet.mb.ca Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I want to know how I can get hold of an article published by E.J. Sterba in the July 1931 Issue of the Proceedings of the Institute of Radio Engineers (starting page 1184). The article was a detailed description of the Sterba array. Can anyone help me ? Maiko Langelaar VE4KLM, Winnipeg --------------------- | SLM Software Inc. | | slmusr03@SLMSoft.CA | --------------------- From lwbyppp@epix.net Fri Jan 12 14:06:05 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!in-news.erinet.com!imci3!imci2!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: <72527.01012@compuserve.com> Newsgroups: rec.radio.amateur.antenna,rec.radio.cb Subject: Antron 99 ground plane Date: 11 Jan 1996 16:42:01 GMT Organization: CompuServe Incorporated Lines: 38 Message-ID: <4d3ekp$cg3@dub-news-svc-6.compuserve.com> NNTP-Posting-Host: ad70-017.compuserve.com Content-Type: text/plain Keywords: antron antenna Content-length: 1669 X-Newsreader: AIR Mosaic (16-bit) version 4.00.08.32 Xref: news.epix.net rec.radio.amateur.antenna:18373 rec.radio.cb:25535 >I've read in several newsgroups that there is no performance >increase when using the ground plane kit on a Antron 99. I am >still wondering if using the ground plane kit will reduce >interferance with phones and/or TVI at homes that are close to >me? The theory being that the ground plane kit will help radiate >my signal in more of an upward direction and not directly at a TV >ant./phone lines of my neighbors. Does anybody have any thoughts >on this subject that will help? Thanks in advance for your >inputs. >George (thunder) I was hoping that this thread will not start again, but here we go: The Antron 99 is a half wave antenna. A half wave antenna has a high impedance at its base. (about 1000 ohms) There is a much lower antenna current at its base than a 1/4 or 5/8 wave antenna, therefore it has very little use for radials. A 5/8 and 1/4 wave antenna has a lower base impedance thus a higher antenna current at its base. Rf energy will tend to "spill over" the bottom of the antenna on to the mast and anything else touching the mast. The use of radials "de-couples" the antenna and minimizes this effect. While there is still a small amount of RF spilling over the base of a 1/2 wave, it is minimal and the addition of a radial kit will be a waste of money to eliminate what is practically non-existant. Sort of like putting up a seven foot fence to make sure that your six foot neighbor won't be able to see you when a six foot fence will do. (Yeah, I know, what if he stands on his toes?) Use your money for better coax, higher mast, or a TVI filter to fix the problem 73 from Steve, Havertown, PA From lwbyppp@epix.net Fri Jan 12 14:06:06 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom4!faunt From: faunt@netcom4.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: Re:QST Tuner Article In-Reply-To: mack@mails.imed.COM's message of 11 Jan 96 14:29:13 GMT Message-ID: Sender: faunt@netcom4.netcom.com Organization: at home, in Oakland References: <9600118213.AA821378459@mails.imed.com> Date: Thu, 11 Jan 1996 17:15:59 GMT Lines: 59 Xref: news.epix.net rec.radio.amateur.homebrew:12646 rec.radio.amateur.antenna:18376 Does the copyleft protect the authors from someone else using the code in a commercial product, or just specify that all changes, as well as the original source must be made available? The article has got enough information to be useful as it is, both as a kit and as food for thought, and I don't fault the ARRL for publishing it, but it's frustrating that to do anything with that, you'd have to reconstruct the code, instead of being able to build on what's gone before. It looks to me as if the MC68HC811E2 is compatible with the -A1 part used in the article, and has 4 times as much EEPROM for the code. This would give lots of room for additional functions. Also, the PD0 and PD1 asynchronous serial port pins are just connected to each other, and with the addition of an RS-232 converter could perhaps be used to connect to a computer, or other remote controller. I also wonder why, apparently, the unit stops tuning when it gets to a specified level, and doesn't actually continue to find best match. In addition, there seem to be four more A/D ports available, and I wonder if a phase detector or other sensor could be added to make for an even more efficient match hunting algorithm. My preliminary checking indicates that developement hardware and software for these microprocessors are readily available and cheap. Check out "Nuts and Volts" or the 68HC11 microcontroller FAQ. Also, if you just doubled the values of the capacitors and/or the inductors, how much would you trade optimization of match for extended capability on 160M (how much extended capability)? This version doesn't require the code, BTW, just the kit, a couple of capacitors, and some wire. If you were willing to sacrifice some of the indicators (use an external SWR meter, say), or use the async port for control and status, you could, I think, extend the range on 160M, without sacrificing optimization, but this again requires modifying the code. I rather wonder if I'd have paid as much attention to the article if there hadn't been so much controversy about it. 73, doug From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Date: 11 Jan 96 14:29:13 GMT I would encourage authors to incorporate the "copyleft" of the Free Software Foundation. This is a more restrictive copyright. It says that if you modify the software for your personal use and make improvements, you must share those improvements freely with others. This is the spirit of amateur radio at its best, IMHO. BTW, the article was a really neat idea. I may build one similar soon. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Fri Jan 12 14:06:07 1996 Path: news.epix.net!news.sprintlink.net!news.tcd.net!news From: rayc@tcd.net (Ray D. Congdon) Newsgroups: rec.radio.amateur.antenna Subject: Re: G5RV Reviews? Date: Thu, 11 Jan 96 17:44:59 GMT Organization: ISA-USA Lines: 11 Message-ID: References: <4cgjte$4vc@ixnews4.ix.netcom.com> <9601080536177457@saloon.bcbbs.net> NNTP-Posting-Host: slip13.cedar.tcd.net X-Newsreader: Quarterdeck Message Center [1.0] Have used a number of them over the years... Good antenna, Very forgiving. Don't wait! Lay it on the snow and load it up... you will be amazed! (It does work best up high... as do most antennas...) 73's ---- Ray D. Congdon N7HQK ISA-USA 5515 N. 4400 W. Cedar City, Utah 84720 From lwbyppp@epix.net Fri Jan 12 14:06:09 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: SB-201 SWR Message-ID: <1996Jan11.190138.25308@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4cp0eg$15lv@chnews.ch.intel.com> <4ctkko$pp8@newsbf02.news.aol.com> <4d31s5$abk@ns.oar.net> Date: Thu, 11 Jan 1996 19:01:38 GMT Lines: 76 In article <4d31s5$abk@ns.oar.net> jaeschke wri tes: >I have been struggling with the problem of matching, SWR, and >power transfer even since I read an article by Gary Coffman >that said that most outputs don't match the 50 ohm impedance >since that would not be very efficient. I have search through >my college books on SWR and have not found one that deals with >source impedance on the transmission line. They all seem to >deal with load mismatch. Oh, I hope I didn't say *that*. What I said was that the real (dissipative) plate resistance of the tube isn't matched to 50 ohms by the output network. If it were, efficiency couldn't be greater than 50%. In fact, the real dissipative internal tube resistance is *minimized* by the tube manufacturer in order to increase efficiency. That value can be approximated from Epsat/Ipsat for the tube (which is an operating point we'd never use in practice unless we were using the tube as a *switch*). Now the output network is certainly a transformer that transforms a 50 ohm load impedance to a value that corresponds to a point on the *desired* tube loadline (at a particular operating point). In fact the transformed output load *is* the point on the loadline presented to the tube at that operating point, so by *definition* the loadline is matched to the output load by the output network, but that's just ordinary transformer action, it doesn't mean that the loadline is a real tangible power dissipating resistor *in* the tube. That's backwards because the loadline is something we're trying to *present* to the tube by the transformer action of the output network on the output load impedance. All the chatter about "conjugate" matching just confuses the issue. >I am really getting confused now when I ream your comment that >the load line of a tube is non-dissipative. I always thought >that it was. Could you expand on either topic. A tube loadline is just the line whose slope satisfies the expression -delta(Eg1)/delta(Ep) As you can see by inspection, that doesn't describe a resistance. It is just a convienent way to describe the tube transfer characteristic. It is normally presented being superposed on a graph of constant current curves of the tube, and that's where things can become confused if you aren't careful. The tube current (for a tetrode) is in turn defined by Ip = K*(Eg1 + Eg2/us + Ep/up)^3/2 Where K is a factor determined by tube geometry, Eg1 is the control grid voltage, Eg2 is screen voltage, us is the screen amplification factor, Ep is plate voltage, and up is the plate amplification factor. Since Eg2 is typically fixed and up is a fairly large number, Delta Ip is determined almost solely by the product of K and Eg1. In other words, the tube is a current *valve* controlled by control grid voltage. The value of Ep/Ip measured at the tube plate is not intrinsic and doesn't represent a real dissipative resistance inside the tube. It is just a consequence of the external load presented to the tube (as transformed by the output network), and the control grid voltage at any given instant. The reason a tube gets hot is just from the kinetic energy of the electrons bombarding the plate being turned into heat. So plate temperature is a function of Eg1 and the transformed output load impedance (which establish the value of Ip), and Ep which represents the accelerating potential that imparts the kinetic energy to the electrons. Those two functions are *decoupled*, so you can't just naively apply Ep/Ip = Rp. That's misleading at best because you can't say Ip=Ep/Rp since Ip is determined by Eg1 and transformed RL, not by the thermal/kinetic effect of a resistor in the tube plate. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 12 14:06:11 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: BColenso@aol.COM Newsgroups: rec.radio.amateur.antenna Subject: Angle of Ground Plane Radials Date: 12 Jan 96 01:02:39 GMT Organization: ucsd usenet gateway Lines: 27 Message-ID: <960111200237_113718847@mail06.mail.aol.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu In a message dated 96-01-11 10:27:43 EST, you wrote: > >On Tue, 9 Jan 1996, Charlie Fortner wrote: >> I've seen plans for 2m using a SO-239 and some copper rods. The >> instructions say to bend the rods at a 45 degree angle towards the >> ground. I've seen commercially made 2m antennas that don't have bent >> radials. What does the angle of the radials do for the signal? > >The easiest way for me to explain it is: the 45 degree angle is to >make the typical home brew 1/4wave antenna come out to around 50ohm >impedance. I am sure a lot of other people will come out with other I do believe Tom is correct here. With this type of simple 1/4 wave ground plane, the radials are cut about 5% longer than the (radiator?). With a radial angle of 90 degrees, the impedance is around 30 ohms. If the radials were brought straight back (180 degrees), you would have a 1/2 wave dipole (72 ohms). 45 degrees will give you about 50 ohms. The antennas with radials that are not bent are probobly not 1/4 wave antennas. 5/8 wave antennas have a lower radiation angle, and provide more gain than a 1/4 wave antenna. There is no need to bend the radials, since a matching device is already needed. Bending would only add the manufacturing process. Bob KD8WU From lwbyppp@epix.net Fri Jan 12 14:06:11 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!oleane!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: davidst1@aol.com (DavidSt1) Newsgroups: rec.radio.amateur.antenna Subject: Radiation Resistance of end-feed, unbalanced antennas Date: 12 Jan 1996 04:29:56 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 12 Sender: root@newsbf02.news.aol.com Message-ID: <4d59mk$79p@newsbf02.news.aol.com> Reply-To: davidst1@aol.com (DavidSt1) NNTP-Posting-Host: newsbf02.mail.aol.com Tell me if I have this right: Given an end-fed wire tuned to resonance with a series L/C tuner, the radiation resistance is a function of the effective height of the wire above it's ground plane. I'm thinking of aircraft HF antennas here. Given the antenna is tuned to resonance, the wire's effective height above "ground" (the aircraft body) is small so the radiation resistance is, at best, a few ohms. So, given that X is tuned out, that leaves radiation resistance plus ohmonic resistances. Is this correct? Thanks, D. Stinson From lwbyppp@epix.net Fri Jan 12 14:06:13 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 12 Jan 1996 05:25:03 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 77 Sender: root@newsbf02.news.aol.com Message-ID: <4d5ctv$8u8@newsbf02.news.aol.com> References: <4d32e9$abk@ns.oar.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Jim, In article <4d32e9$abk@ns.oar.net>, jaeschke writes: >I am struggling to understand SWR, power transfer, and >matching. This started with I read an article by Gary Coffman >that said that most radio outputs are not matched to 50 ohms >since that would not be efficient. I have checked into my >college text books and they don't deal with different source >impedance only load impedance. It sure is a struggle! There are two conflicting views on this. Let me try to explain my view, let me know if anything doesn't make sense (one topic at a time). The tube is a varying resistance that is completely out of the circuit (in some classes of amplifiers) for some portion of the RF cycle. The efficiency is NOT limited by the value of load impedance (high or low), but rather by the conduction angle of the tube. Maximum efficiency and maximum power transfer occur at the same point in an ideal PA stage (no parasitic losses outside the tube). Power conversion efficiency can approach 100% if an ideal tube is far into class C at the point of maximum power transfer! Look closely at Thevenin's (and Norton's) model descriptions in college reference books. You will find the rules of the models prevent their use in talking about anything that goes on internal to any source, and furtermore rule out their use in non-linear systems. My puzzlement is why some of us try to use the Thevenin model to determine source efficiency in spite of Thevenin's rules saying that can't be done. That is compounded by trying to use it in a non-linear power converter (not a generator) circuit. The tube is not a "source" at all, it is a time varying resistor. Thevenin and Norton only deal with power transfer, not source efficiency or operation. When the circuit's average impedance is matched to the load, power transfer is maximum. It's that simple. We can have no idea what is going on inside the black box source from using these models. Furthermore, Norton states his model directly interchanges with Thevinin's model if the proper values are substituted. Where does that leave the series R model? That substitution (that every textbook indicates can freely occur) would result in maximum efficiency with exactly the opposite load R!!!!!! If you can, do this simple test. Apply a safe amount of drive to a AB, B or C class PA stage. Tune the stage for the absolute maximum power output with that safe fixed drive level. Calculate the efficiency. Change the load impedance up or down and re-calculate the efficiency. In nearly all cases efficiency will exceed 50% when the stage is tuned for maximum output. If the load impedance is varied a large amount, you will see the efficiency and the power output BOTH fall off. The Thevenin model does NOT work to determine efficiency. > I agree with Gary, if you could >use a different, lower, source impedance the power transfer >would be much more efficient. That's incorrect, as doing the above simple test will prove. >Your statement about the load line of a tube being >non-dissapative is also hard for me to understand. I always >thought that a tube had an operating point impedance determined >by the average current and plate voltage. This is certainly >dissapative. It's determined by the maximum available fundamental current and voltage. Let me ask a few questions. If I had a point in a circuit that delivered maximum power at 50 volts and the maximum current was one ampere, what would be the optimum load impedance? If we wanted to connect a transmission line to that point what impedance line would work most efficiently? Why is the PA any different? 73 Tom 73 Tom From lwbyppp@epix.net Fri Jan 12 14:06:14 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 12 Jan 1996 05:25:45 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 15 Sender: root@newsbf02.news.aol.com Message-ID: <4d5cv9$8uq@newsbf02.news.aol.com> References: <4d2h90$7fm@ender.techcenter.paccar.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4d2h90$7fm@ender.techcenter.paccar.com>, kg7hq@paccar.com (Michael A. Sterba) writes: >I think your right here. :) Real world antenna problems are bit harder to >deal with and >a laboratory simulation. >At least this is what this real "Sterba" has found. The only problem with Sterba is he makes mistakes, and doesn't allow anyone to correct them. That makes his column a poor forum for education, because it everything in it is just his opinion. It should be read for entertainment, but not for knowlege enhancement. 73 Tom From lwbyppp@epix.net Fri Jan 12 14:06:15 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!news.uoregon.edu!psgrain!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!btnet!zetnet.co.uk!demon!peer-news.britain.eu.net!EU.net!news.eunet.fi!jjo From: jjo@tekla.fi (Jari Jokiniemi) Newsgroups: rec.radio.amateur.antenna Subject: Re: [Q]: Diffraction loss calculation? Date: 12 Jan 1996 06:23:46 GMT Lines: 9 Message-ID: References: <121831@ljutcp.hamradio.si> NNTP-Posting-Host: ds10.tekla.fi In-reply-to: s51fu@ljutcp.hamradio.si's message of 11 Jan 96 03:08:55 GMT Rather than digging out the formulas I would like give a reference to a book which deals with propagation issues (including diffraction): David Parsons, The Mobile Radio Propagation Channel, Pentech Press, London 1992, ISBN 0-7273-1316-9. -- Jari Jokiniemi, jari.jokiniemi@tekla.fi, OH2MPO, OH3BU Tekla Oy, Koronakatu 1, 02210 Espoo, 90-8879 474 From lwbyppp@epix.net Fri Jan 12 14:06:16 1996 Path: news.epix.net!mango.epix.net!will From: will@epix.net Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Fri, 12 Jan 1996 09:49:37 -0500 Organization: epix.net Lines: 16 Message-ID: References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> NNTP-Posting-Host: mango.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4d5cv9$8uq@newsbf02.news.aol.com> On 12 Jan 1996, W8JI Tom wrote: > The only problem with Sterba is he makes mistakes, and doesn't allow > anyone to correct them. That makes his column a poor forum for education, > because it everything in it is just his opinion. > > It should be read for entertainment, but not for knowlege enhancement. Tom, I wonder of you can provide any facts to back up your claim? As a fan of Sterba's it never occurred to me to consider him inerrant, but as a lifetime subscriber to WORLDRADIO, I have yet to see him fail to admit a mistake. Maybe I have missed something. will@epix.net - KD3XR - W F Sill, Tunkhannock, PA From lwbyppp@epix.net Fri Jan 12 14:06:18 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 12 Jan 1996 10:12:25 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 43 Sender: root@newsbf02.news.aol.com Message-ID: <4d5top$g7j@newsbf02.news.aol.com> References: <4d32e9$abk@ns.oar.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi, We have to be careful what we say here: >The reason a tube gets hot is just from the kinetic energy of the >electrons bombarding the plate being turned into heat. So plate >temperature is a function of Eg1 and the transformed output load >impedance (which establish the value of Ip), and Ep which represents >the accelerating potential that imparts the kinetic energy to the >electrons. Those two functions are *decoupled*, so you can't just >naively apply Ep/Ip = Rp. That's misleading at best because you can't >say Ip=Ep/Rp since Ip is determined by Eg1 and transformed RL, not >by the thermal/kinetic effect of a resistor in the tube plate. The dissipation of a tube at any given instant of time is determined exactly as we would for any dissipating resistance that limits the current and voltage to the value obtained in that particular circuit element. This reminds me of something a guy running a lead-acid battery powered model streetcar at a train show once told me. He was using a bank of large rectifier diodes to reduce the voltage, but complaining about battery life. I suggested he build a switching supply to limit the motor speed, but he retorted that he wasn't dissipating power because the diodes weren't resistors. I asked him why the diodes were on heatsinks then, and why the dissipation of the diodes was determined by E/I in that element of the circuit! He went into a long explaination of what goes on inside the diode. But despite the less than educational retort, the result was the diodes dissipated power and produced heat just like a resistor. The power dissipated was E*I. If we "took a snapshot" of the circuit and looked at the tube's anode dissipation, the power dissipated is a product of E*I at that instant. If the anode current is one ampere, and the anode to cathode voltage is 100 volts at that instant of time, the plate dissipation is exactly 100 watts at that instant of time. I think all of this is a side issue of how the parameters or terms used to describe chariteristics of a tube are defined, and not related to the real question asked. The real issue and cause of the confusion is misuse of models. Maximum power transfer ALWAYS occurs with a conjugate match, and the efficiency can not be determined via Thevenin or Norton. 73 Tom From lwbyppp@epix.net Fri Jan 12 14:06:19 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.antenna Subject: Re: Antenna for Radio Shack CB? TRC-225 Date: 12 Jan 1996 11:05:39 GMT Organization: SRC Lines: 16 Message-ID: <4d5fam$4fd@news.iii.net> References: <4d2icd$ile@news.service.uci.edu> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: shreeve@meded.med.uci.edu Ahhh You've been had by hype... I remember a Motorola spec. for a power device. (IF) you put in under Niagra Fall in January you could get 600 watts... Anyway, the range is IDEA, and you know I bet you DONT live on the top of K-2. So yes, and antenna will extend yuor range. P.S. In about 5 years, if everyone else would shup up, your radio will be able to go around the world. The sun spot cycle is returning! Tom WA1RHP From lwbyppp@epix.net Wed Jan 17 14:22:17 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!in2.uu.net!mercury.near.net!news.ner.bbnplanet.net!llnews.ll.mit.edu!usenet From: kaufmann@ll.mit.edu (John Kaufmann) Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new article Date: Thu, 11 Jan 96 15:24:25 GMT Organization: M.I.T. Lincoln Laboratory Lines: 47 Distribution: world Message-ID: <4d3a39$g1v@llnews.ll.mit.edu> References: <199601091344.HAA17524@tri.net> <4d084a$oue@newsbf02.news.aol.com> X-Newsreader: News Xpress Version 1.0 Beta #2.1 w8jitom@aol.com (W8JI Tom) wrote: >1.) When I actually measured the FS from a 80 meter vertical with four >elevated radials, FS was around five dB down from the same antenna with >~60 1/4 wl radials. When I measured ~60 radials elevated or on the ground, >there was NO difference between the two systems. > >2.) When one of the main supporters of elevated radials actually measured >an elevated radial antenna (in crude form) it was a few dB down from >predictions. > >3.) When a low dipole was actually measured (a full pattern proof done in >helicopters) and compared to NEC-2 there was a 4 or 5 dB shortfall from >NEC's predictions. > >4.) AM BCB station WVNJ has six elevated radials and a full proof revealed >the signal is 5 or 6 dB down from NEC models. They are now installing a >conventional system. > >5.) Other broadcast stations appear to have a similar shortfall in signal >when using elevated radials. > [. . .] >73 Tom Tom, I've used EZNEC (based on NEC-2) to model verticals with raised radials and th e results seem to support your contention. It is claimed that EZNEC can accurately model a ntennas with horizontal wires close to the ground. According to EZNEC, the gain of a qua rter-wave vertical on 80 meters with four quarter-wave raised radials at heights of 10-15 feet ab ove anything other than perfect ground is several dB (3-4 dB if I remember correctly) below that of a ground-mounted vertical with perfect ground beneath it. There is an option in EZNEC to model ground radials over imperfect ground but its accuracy is admitted to be not great unless a large number of radials is used. In the latter case, EZNEC says a ground-mounted vertical with 100+ quarter-wave radials also outperforms the raised-radial vertical by several dB. Adding se veral more raised radials, increasing their length or increasing their height did not change thi s result very much. In fact there was only one way I could get the gain of the raised-radial vertical to e qual the ground-mounted vertical- - -by adding lots of ground radials beneath the raised radials (in w hich case why bother with raised radials at all?) or by assuming perfect ground in the first place. 73, John Kaufmann W1FV kaufmann@ll.mit.edu From lwbyppp@epix.net Wed Jan 17 14:22:19 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!news.internetMCI.com!newsfeed.internetmci.com!info.ucla.edu!agate!holonet!colossus.holonet.net!cencore!forrest.gehrke From: forrest.gehrke@cencore.com (FORREST GEHRKE) Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new article Message-ID: <8B8B27C.02CF000511.uuout@cencore.com> Date: Fri, 12 Jan 96 10:36:00 -0300 Distribution: world Organization: Central Core BBS, 201-575-8991 Reply-To: forrest.gehrke@cencore.com (FORREST GEHRKE) References: <199601091344.HAA17524@tri.net> X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 48 LS> He also refers to an article I've filed away and nearly forgotten: LS> Using Elevated Radials with Ground Mounted Towers by KB8I in Sept LS> 91, pp 77-82 IEE Trans on Broadcasting. ".. it is possible to use LS> four elevated radials together with a conventional ground-mounted, LS> base-insulated tower for MF broadcasting purposes, and achieve the LS> same level of performance which is normally obtained from a classic LS> 120-buried-radial system." This from NEC simulation. In 1989 a real test was granted by the FCC at Newburgh, NY. The vertical was 105 feet long with a 15 foot insulated ground post and 6 1/4 wavelength raised radials at 15 feet. Frequency 1580kHz. Report claims field strength readings equal to 120 1/4 w.l. ground radials. Claim was based on computer modelling using NEC-GS (of which I have no knowledge). Impedance: 14.9 -j 124.8 No actual real comparison to 120 ground mounted radial test was run. I made a calculation of what a 0.17 wavelength vertical with 120 1/4 w.l. ground radials would be but I can't locate it today and haven't the time to re-do it. LS> knowledge about ham radio, etc. adds: "George Brown, it needs to be LS> stressed, was not adverse to elevated, artificial ground screen. He LS> was, in fact, the inventor of the HF/VHF artificial ground-plane LS> antenna. He once confessed to me over lunch that his original LS> version used only two radials, but to satisfy early police-radio LS> customers this was increased to four radials without significantly LS> increasing radiation efficiency." (My comment...these were way up LS> in the air) George Brown refers to this two radial vhf antenna in his memoir. The patent assignment is to Brown, Lewis, & Epstein. The two-radial antenna came about to accommodate its use to tugboats in NY Harbor as they couldn't allow the 2 radials abeam. You have to remember that this application was not aimed at efficiency--only something that was good enough for the purpose. Dr. Lewis tells me that the impedance was nowhere near 36.5 resistive, which his modelling tests with a solid disk showed. Brown, in his memoir, says that this work led to his invention of the turnstile antenna used for TV broadcasting. * RM 1.3 02583 * Is this yours? Your dog left it on my lawn... From lwbyppp@epix.net Wed Jan 17 14:22:20 1996 Path: news.epix.net!news.sprintlink.net!hookup!pravda.aa.msen.com!fu-berlin.de!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new article Date: 12 Jan 1996 08:34:49 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 21 Message-ID: <4d56f9$n4u@info4.rus.uni-stuttgart.de> References: <199601091344.HAA17524@tri.net> <4d084a$oue@newsbf02.news.aol.com> <4d3a39$g1v@llnews.ll.mit.edu> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article <4d3a39$g1v@llnews.ll.mit.edu>, John Kaufmann wrote: >According to EZNEC, the gain of a quarter-wave vertical on 80 meters >with four quarter-wave raised radials at heights of 10-15 feet above >anything other than perfect ground is several dB (3-4 dB if I remember >correctly) below that of a ground-mounted vertical with perfect ground >beneath it. Hi John, Your results are really surprizing, I am sure you are aware of the fact that the idea of raised radials has been proposed on the base of NEC simulations. Although there is no mention of the actual NEC version in the IEEE papers by Christmann, it has been said that he used NEC-4 or some other recent version. Any explanation? 73, Moritz DL5UH From lwbyppp@epix.net Wed Jan 17 14:22:21 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!cencore!forrest.gehrke From: forrest.gehrke@cencore.com (FORREST GEHRKE) Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new articl˙˙˙˙˙ Message-ID: <8B8B326.02CF00052B.uuout@cencore.com> Date: Fri, 12 Jan 96 13:26:00 -0300 Distribution: world Organization: Central Core BBS, 201-575-8991 Reply-To: forrest.gehrke@cencore.com (FORREST GEHRKE) References: <4d084a$oue@newsbf02.news.aol.com> X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 12 WT> The true advantage to elevated radials? Putting up the antenna is a WT> bit easier. ;-) Tom, I agree with every one of your points vis-a-vis raised radials and grounded. But I have trouble visualizing why an 80M vertical, for instance, would be easier to put up with raised radials. I'd rather have those radials lying on the ground than trying to figure out how to keep a bunch of radials raised above ground. * RM 1.3 02583 * If it ain't broke yet, let me have a shot at it.... From lwbyppp@epix.net Wed Jan 17 14:22:22 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.interlog.com!news.dra.com!news.starnet.net!wupost!udel!gatech!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: "Doty" in new articl˙˙˙˙˙ Date: 14 Jan 1996 05:59:46 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 25 Sender: root@newsbf02.news.aol.com Message-ID: <4dann2$kj3@newsbf02.news.aol.com> References: <8B8B326.02CF00052B.uuout@cencore.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <8B8B326.02CF00052B.uuout@cencore.com>, forrest.gehrke@cencore.com (FORREST GEHRKE) writes: >Tom, I agree with every one of your points vis-a-vis raised >radials and grounded. But I have trouble visualizing why >an 80M vertical, for instance, would be easier to put up >with raised radials. I'd rather have those radials lying >on the ground than trying to figure out how to keep a bunch >of radials raised above ground. Hi Forrest, Let's fact it, putting up FOUR elevated radials is a lot less expensive and time consuming than installing 30 radials anywhere. That's my point, the easy way out....convince yourself four in the air are perfect! Heck, better yet, convince yourself two are enough! ;-) I suspect the reason you had trouble visualizing how an elevated system could be easier to install is because you allready KNEW that four radials aren't enough, either on the ground or in the air a few feet. I suspect the picture that flases in your mind is the same as the one I have, a whole bunch of wire in the air or on the ground. And when we use a whole bunch they look like hell in the air and are almost impossible to support! 73 Tom From lwbyppp@epix.net Wed Jan 17 14:22:23 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.isp.net!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.acadia.net!usenet From: "Jeffrey N. Gibbs" Newsgroups: rec.radio.amateur.antenna Subject: (no subject) Date: 14 Jan 1996 01:28:47 GMT Organization: AcadiaNet, Inc. Lines: 12 Message-ID: <4d9m8f$nbs@post.acadia.net> NNTP-Posting-Host: rck3.acadia.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:rec.radio.amateur.antenna Can anyone tell me how to build an high-gain cellular telephone antenna for my cabin, that will allow me to have reliable communications in a very marginal service area? Right now, I am getting less than one bar (of a possible four) on my car-mounted antenna. With such a poor signal I can't get voice calls out very well, let-alone fax/data modem calls. Please e-mail if you know/are willing to offer advice. THANKS! moose@acadia.net From lwbyppp@epix.net Wed Jan 17 14:22:24 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news.cac.psu.edu!usenet From: John Passaneau Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Re: ***Ham WEB page For all people to use! Give it a TRY*** Date: Tue, 16 Jan 1996 15:47:00 -0800 Organization: Penn State University Lines: 20 Message-ID: <30FC38F4.2EEC@leps.phys.psu.edu> References: <4df36s$3lt@fnord.dfw.net> NNTP-Posting-Host: thing-two.phys.psu.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win16; I) Xref: news.epix.net rec.radio.amateur.equipment:23827 rec.radio.amateur.antenna:18501 rec.radio.amateur.digital.misc:13643 rec.radio.amateur.homebrew:12755 rec.radio.amateur.misc:96988 rec.radio.amateur.policy:32577 rec.radio.amateur.space:6142 David Mclean wrote: > > Hello to all: > > Come a take a look at my new web page. I have been working on it for > the last 4 weeks. I have lots of thing that you will like. Some of the > things that I have are: MODs, Swap Shop, Dfw repeter list, comment page, > links to other good ham pages, call looks ups (updated by the sec), radio > pricing, Links to QRZ,FCC,HRO, and many more. If you are a ham and would > like you web page added to my list just send me e-mail. Please tell me > what you like and dislike about the page. I want all types of comments. > Hope you like what I have. > > -- > David Mclean > From The World of Hamradio > KC5NNV is Clear! > _________________________________________________________________________> - ------------------------------------------------------------------------ It might have been nice to put the address in the message. John Passaneau, WB8EIY, State College Pa. From lwbyppp@epix.net Wed Jan 17 14:22:25 1996 From: Vance Campbell Organization: Novell, Inc. X-Mailer: Mozilla 1.1N (Macintosh; I; PPC) MIME-Version: 1.0 Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Re: ***Ham WEB page For all people to use! Give it a TRY*** References: <4df36s$3lt@fnord.dfw.net> X-URL: news:4df36s$3lt@fnord.dfw.net Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii NNTP-Posting-Host: vcmac.mobius.provo.novell.com Message-ID: <30fbc721.0@news.provo.novell.com> Date: 16 Jan 96 15:41:21 GMT Lines: 9 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!news.sfo.com!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!uknet!uel!news.provo.novell.com! Xref: news.epix.net rec.radio.amateur.equipment:23828 rec.radio.amateur.antenna:18502 rec.radio.amateur.digital.misc:13644 rec.radio.amateur.homebrew:12756 rec.radio.amateur.misc:96990 rec.radio.amateur.policy:32578 rec.radio.amateur.space:6143 David Mclean wrote: >Hello to all: > > Come a take a look at my new web page. I have been working on it for >the last 4 weeks. What's the URL? From lwbyppp@epix.net Wed Jan 17 14:22:26 1996 Path: news.epix.net!news.sprintlink.net!usit.net!news From: rwerner@usit.net (Robert Werner, Jr.) Newsgroups: rec.radio.amateur.antenna Subject: 2 meter antenna for Ford Aspire Date: 13 Jan 1996 03:18:19 GMT Organization: US Internet, Inc. Lines: 7 Message-ID: <4d789r$np4@news.usit.net> NNTP-Posting-Host: bway-slip12.dynamic.usit.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 I recently purchase a Ford Aspire hatchback. I have an 2 meter mobile I would like to mount in it. I need a 1/4 wave antenna that does NOT require drilling. Can someone out there suggest an antenna? Thanks, Bob Werner rwerner@usit.net From lwbyppp@epix.net Wed Jan 17 14:22:27 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: Daniel Calzaretta Newsgroups: rec.radio.amateur.antenna Subject: Re: 2 meter antenna for Ford Aspire Date: 13 Jan 1996 16:13:54 GMT Organization: Pacific Crest Community School Lines: 5 Message-ID: <4d8lo2$4vk@maureen.teleport.com> References: <4d789r$np4@news.usit.net> NNTP-Posting-Host: ip-pdx04-22.teleport.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I use a Larson glass mount and it seems to work great. Dan N9BCC/7 From lwbyppp@epix.net Wed Jan 17 14:22:28 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: Daniel Calzaretta Newsgroups: rec.radio.amateur.antenna Subject: Re: 2 meter antenna for Ford Aspire Date: 13 Jan 1996 16:13:34 GMT Organization: Pacific Crest Community School Lines: 5 Message-ID: <4d8lne$4vk@maureen.teleport.com> References: <4d789r$np4@news.usit.net> NNTP-Posting-Host: ip-pdx04-22.teleport.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: rwerner@usit.net I use a Larson glass mount and it seems to work great. Dan N9BCC/7 From lwbyppp@epix.net Wed Jan 17 14:22:29 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!sloth.swcp.com!tesuque.cs.sandia.gov!lynx.unm.edu!news.cs.indiana.edu!news.nstn.ca!coranto.ucs.mun.ca!dsmith From: dsmith@nlnet.nf.ca (David Smith) Newsgroups: rec.radio.amateur.antenna Subject: Re: 2 meter antenna for Ford Aspire Date: 13 Jan 1996 13:42:43 GMT Organization: NLnet Lines: 7 Message-ID: <4d8csj$nou@coranto.ucs.mun.ca> References: <4d789r$np4@news.usit.net> NNTP-Posting-Host: terra.nlnet.nf.ca X-Newsreader: TIN [version 1.2 PL2] A magnetic mount seems to be the answer here. There are lots of manufacturers out there, most making good products. A glass mount of course is the other way to go, but I've only seen them in 1/2 wave formats. Dave Smith, VO1DMS From lwbyppp@epix.net Wed Jan 17 14:22:30 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!fnnews.fnal.gov!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!newsfeed.tip.net!www.cybercity.dk!usenet From: ccc3843@vip.cybercity.dk Newsgroups: rec.radio.amateur.antenna Subject: Re: 6 meter antennas ?? Date: Fri, 12 Jan 1996 15:11:46 GMT Organization: CyberCity of Denmark Lines: 29 Message-ID: <4d5tj5$bgv@vip.cybercity.dk> References: <30EBF0D0.77B4E982@metronet.com> NNTP-Posting-Host: 194.16.56.105 X-Newsreader: Forte Free Agent 1.0.82 ken brookner wrote: >i've ordered up a ten-tec transverter to build and am now wondering what >types of antennas are being used on 6 meters. i'd prefer to build >something and i don't have room for a big yagi. >suggestions? >thanks! >ken brookner, n5lpi >kenb@metronet.com Hi Ken ! I have build a 2 el. Quad antenna.. The boom is very short (0,12 wavwlength) and it works very fine on six meter. The gain is around 7,3 dBd. You can find more info in the book called: All about cubical quad antennas, by William I. Orr, W6SAI & Stuart D.Cowan, W2LX.... Regard OZ1CDE, Jan Andersen. ccc3843@vip.cybercity.dk. From lwbyppp@epix.net Wed Jan 17 14:22:30 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!news.flinet.com!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.antenna Subject: Re: 6 mtr Antenna Plans Date: Thu, 11 Jan 1996 22:01:10 GMT Organization: Inlink Lines: 17 Message-ID: <4d41ht$e7e@news1.inlink.com> References: <4d12gb$ko0@everest.pinn.net> NNTP-Posting-Host: slip18.inlink.com X-Newsreader: Forte Free Agent 1.0.82 pridgent@pinn.net (Terry Pridgen) wrote: >Looking for simple construction plans for a 6 meter j-pole and other 6 >meter antennas. Please respond to: pridgent@pinn.net >73, KC4YTF >-- Check out the Copper Cactus on my web-page at http://www.inlink.com/~raiar It can be built as a mono-bander Gary KG0ZP From lwbyppp@epix.net Wed Jan 17 14:22:31 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!sgigate.sgi.com!news1.best.com!pravda.aa.msen.com!fu-berlin.de!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: 6 mtr Antenna Plans Date: 11 Jan 1996 08:41:05 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 14 Message-ID: <4d2if1$21ca@info4.rus.uni-stuttgart.de> References: <4d12gb$ko0@everest.pinn.net> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article <4d12gb$ko0@everest.pinn.net>, Terry Pridgen wrote: >Looking for simple construction plans for a 6 meter j-pole and other 6 >meter antennas. This reminds me that in the DUBUS magazine there are new designs for 6 meter yagis by DJ9BV. They are optimized by NEC-2. 5.90 meter boom length, 9.4 dB/d 12.90 meter boom length, 11.9 dB/d. Good DX! 73, Moritz DL5UH From lwbyppp@epix.net Wed Jan 17 14:22:32 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!news.uoregon.edu!news.bc.net!news.mindlink.net!van-bc!unixg.ubc.ca!atha!rwa From: rwa@cs.athabascau.ca (Ross Alexander) Newsgroups: rec.radio.amateur.antenna Subject: Re: angle of ground plane radials???? Date: 10 Jan 1996 21:57:08 GMT Organization: Athabasca University Lines: 19 Message-ID: <4d1cnk$bcn@aurora.cs.athabascau.ca> References: NNTP-Posting-Host: aupair.cs.athabascau.ca X-Newsreader: NN version 6.5.0 #10 (NOV) charlie@netdepot.com (Charlie Fortner) writes: >I've seen plans for 2m using a SO-239 and some copper rods. The >instructions say to bend the rods at a 45 degree angle towards the >ground. I've seen commercially made 2m antennas that don't have bent >radials. What does the angle of the radials do for the signal? Nothing in particular; but it raises the feedpoint impedance from around 37 ohms to something pretty close to 50 ie it lowers the SWR. regards, Ross ps: not that it really matters; most handies are very forgiving ditto most mobiles. -- Ross Alexander, ve6pdq -- (403) 675 6311 -- rwa@cs.athabascau.ca From lwbyppp@epix.net Wed Jan 17 14:22:33 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!uwm.edu!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet Newsgroups: rec.radio.amateur.antenna Subject: Re: angle of ground plane radials???? Message-ID: From: Bill Harwood Date: Tue, 16 Jan 1996 20:27:43 GMT Sender: usenet@avalon.chinalake.navy.mil (NAWS news admin) References: Organization: NAWS, China Lake, CA Content-Type: text/plain; charset=us-ascii To: charlie@netdepot.com Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:charlie-0901961929270001@europa05.netdepot.com Lines: 30 charlie@netdepot.com (Charlie Fortner) wrote: >I've seen plans for 2m using a SO-239 and some copper rods. The >instructions say to bend the rods at a 45 degree angle towards the >ground. I've seen commercially made 2m antennas that don't have bent >radials. What does the angle of the radials do for the signal? 1. It brings the characteristic impedance closer to 50 ohm from about 72 ohm for horizontal radials. These are very relative numbers depending on installation and location. The sloped radials provide a better match. 2. Because of item 1. and a little fat wire effect from the four ground wires coupling a little bit and acting like a fat couterpoise, the bandwidth should be wider (broader). 3. Do you get a little radiation from the radials... well maybe. They increase the effective apature a little but not a lot of db improvement for this reason. Good Luck and angle those radials down \------------------------------------------------------/ \ Bill Harwood U play it, I'll dance it / \ AB6DY or / \ I'll play it, U dance it / \----------------------------------------------/ From lwbyppp@epix.net Wed Jan 17 14:22:34 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!howland.reston.ans.net!news.nic.surfnet.nl!news.sara.nl!news.pi.net!news From: kcl@pi.net (Rolf v/d Meulen) Newsgroups: rec.radio.amateur.antenna Subject: Antenna for Ericsson NH238 Date: Mon, 15 Jan 1996 17:54:47 GMT Organization: KCL Foundation Lines: 5 Message-ID: <4de4e0$p7a@neptunus.pi.net> NNTP-Posting-Host: lee43.pi.net X-Newsreader: Forte Free Agent 1.0.82 To improve the working of my handheld mobile phone i am interrested in a 1/2 wave dipole and one director antena for the ATF 3 net (800-900) Mhz. Who has a solution. From lwbyppp@epix.net Wed Jan 17 14:22:35 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!portal.gmu.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!news3.noc.netcom.net!zdc!zippo!usenet From: "Jason R. Rieg" Subject: Re: Antenna Simulation Software Content-Type: text/plain; charset=us-ascii Sender: usenet@news.zippo.com Content-Transfer-Encoding: 7bit Nntp-Posting-Host: jrieg.bpd.harris.com Organization: Harris Corporation Message-ID: References: X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Mime-Version: 1.0 Date: Fri, 12 Jan 1996 15:11:32 GMT Lines: 43 Wendy, I have had the opportunity to test a number of different software packages and have come to the following conclusions: ELNEC Nice little package. Cheap, easy to use, has given us very rel iable data in the past. MININEC based. EZNEC Same format as ELNEC, same author (Roy Lewallen). It is based on NEC2 and has given use some good data, but if we're in doubt, w e check the data against ELNEC and go with ELNEC's results, as we have measured data against ELNEC in the past with accurate results. MININEC The granddaddy of them all. Written in Basic back when dinosau rs ruled the earth. Same code as ELNEC. Not as easy to use, thou gh. MININEC Probably the worst $400 we've ever spent. I was impressed with the PROFESSIONAL brochure. They have some nice options, but a lot of them don't work properly. It's Windows based and the that actually makes it mo re cumbersome than something like EZNEC. It's hase a nice geometr y node transformation that could be useful if we could get good data o ut of the program. I've ran the EXACT same geometry through ELNEC an d MININEC Professional and the MININEC Professional's results are completely wrong, sometimes giving a negative resistance as a r esult. That would be really cool if we could get it to work in real li fe. Overall, I'd say that EZNEC is your best bet at a decent price. It's results haven't always lived up to our expectations, but we are modelling some pretty radical stuff. There was somebody up in Alaska with a package that showed some promise, but f or the life of me I can't remember the name of the guy or the package. He offers a d emo over the net, so you might be able to troll for it on the Web. Good luck and let me know how it goes. -- | Jason Robert Rieg | "listen: there's a hell of a | ___ __o | | Antenna Electrical Engineer | good universe next door; | ___ _`\<,_ | | Harris Corp. / Broadcast Div. | let's go." | ___ (*)/ (*) | | jrieg@harris.com | - E.E. Cummings | ^^^^^^^^^^^^ | From lwbyppp@epix.net Wed Jan 17 14:22:37 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Roger A. Cox <75052.3037@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna Subject: Re: Antenna Simulation Software Date: 12 Jan 1996 18:22:08 GMT Organization: Telex Communications, Inc. Lines: 14 Message-ID: <4d68sg$n36$1@mhafn.production.compuserve.com> References: Wendy, Are you looking for HAM antenna software or Electromagnetics - Professional type? EZNEC, ELNEC, MININEC-3, NEC for Wires, YO, MN, AO are all great for Ham antennas. For greatest flexibility, you need either NEC-2 or NEC-4 from Lawrence Livermore National Labs. These cost about $850, but are worth it if you are designing or analyzing antennas for your job. If you need more info on NEC software, I can point you to the appropriate FTP or WEB site. Roger Cox WB0DGF From lwbyppp@epix.net Wed Jan 17 14:22:37 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!decwrl!tribune.usask.ca!canopus.cc.umanitoba.ca!news From: Terry Calof Newsgroups: rec.radio.amateur.antenna,rec.radio.cb Subject: Re: Antron 99 Ground Plane Date: 12 Jan 1996 18:58:50 GMT Organization: The University of Manitoba Lines: 6 Message-ID: <4d6b1a$fim@canopus.cc.umanitoba.ca> References: <4d3c3r$8su$1@mhafn.production.compuserve.com> NNTP-Posting-Host: dial112.mbnet.mb.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; 68K) To: 103021.3555@CompuServe.COM X-URL: news:4d3c3r$8su$1@mhafn.production.compuserve.com Xref: news.epix.net rec.radio.amateur.antenna:18393 rec.radio.cb:25579 I'm using an A99 on my roof, with ground plane kit. The RFI is still terrible. It gets into the intercom, telephones, and even makes my garage door opener light flash. I wouldn't bother with it. Terry VE4UC From lwbyppp@epix.net Wed Jan 17 14:22:38 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!decwrl!tribune.usask.ca!canopus.cc.umanitoba.ca!news From: Terry Calof Newsgroups: rec.radio.amateur.antenna,rec.radio.cb Subject: Re: Antron 99 Ground Plane Date: 12 Jan 1996 18:59:07 GMT Organization: The University of Manitoba Lines: 6 Message-ID: <4d6b1r$fim@canopus.cc.umanitoba.ca> References: <4d3c3r$8su$1@mhafn.production.compuserve.com> NNTP-Posting-Host: dial112.mbnet.mb.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; 68K) To: 103021.3555@CompuServe.COM X-URL: news:4d3c3r$8su$1@mhafn.production.compuserve.com Xref: news.epix.net rec.radio.amateur.antenna:18394 rec.radio.cb:25580 I'm using an A99 on my roof, with ground plane kit. The RFI is still terrible. It gets into the intercom, telephones, and even makes my garage door opener light flash. I wouldn't bother with it. Terry VE4UC From lwbyppp@epix.net Wed Jan 17 14:22:40 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.ksu.ksu.edu!news.mid.net!news.nde.state.ne.us!esu2.esu2.k12.ne.us!dmull2 From: dmull2@esu2.esu2.k12.ne.us (Dennis Mull2) Newsgroups: rec.radio.amateur.antenna,rec.radio.cb Subject: Re: Antron 99 ground plane Followup-To: rec.radio.amateur.antenna,rec.radio.cb Date: 11 Jan 1996 18:55:54 GMT Organization: Nebraska Dept. of Education Lines: 39 Message-ID: <4d3mfq$mcu@news.nde.state.ne.us> References: <4d3ekp$cg3@dub-news-svc-6.compuserve.com> NNTP-Posting-Host: esu2.esu2.k12.ne.us X-Newsreader: TIN [version 1.2 PL2-E1] Xref: news.epix.net rec.radio.amateur.antenna:18399 rec.radio.cb:25592 72527.01012@compuserve.com wrote: : >I've read in several newsgroups that there is no performance : >increase when using the ground plane kit on a Antron 99. I am : >still wondering if using the ground plane kit will reduce : >interferance with phones and/or TVI at homes that are close to : >me? The theory being that the ground plane kit will help radiate : >my signal in more of an upward direction and not directly at a TV : >ant./phone lines of my neighbors. Does anybody have any thoughts : >on this subject that will help? Thanks in advance for your : >inputs. : >George (thunder) : I was hoping that this thread will not start again, but here we go: : The Antron 99 is a half wave antenna. A half wave antenna has a high : impedance at its base. (about 1000 ohms) There is a much lower antenna : current at its base than a 1/4 or 5/8 wave antenna, therefore it has : very little use for radials. : A 5/8 and 1/4 wave antenna has a lower base impedance thus a higher : antenna current at its base. Rf energy will tend to "spill over" the bottom : of the antenna on to the mast and anything else touching the mast. : The use of radials "de-couples" the antenna and minimizes this effect. : While there is still a small amount of RF spilling over the base of a 1/2 : wave, it is minimal and the addition of a radial kit will be a waste of : money to eliminate what is practically non-existant. Sort of like putting : up a seven foot fence to make sure that your six foot neighbor won't : be able to see you when a six foot fence will do. (Yeah, I know, what : if he stands on his toes?) : Use your money for better coax, higher mast, or a TVI filter to : fix the problem : 73 from Steve, Havertown, PA From lwbyppp@epix.net Wed Jan 17 14:22:40 1996 Path: news.epix.net!news.sprintlink.net!news.inc.net!news.sol.net!uniserve!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: George Harris <103021.3555@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna,rec.radio.cb Subject: Antron 99 Ground Plane Date: 11 Jan 1996 15:58:51 GMT Organization: Amp Inc. / Lytel Division Lines: 14 Message-ID: <4d3c3r$8su$1@mhafn.production.compuserve.com> Xref: news.epix.net rec.radio.amateur.antenna:18404 rec.radio.cb:25596 I've read in several newsgroups that there is no performance increase when using the ground plane kit on a Antron 99. I am still wondering if using the ground plane kit will reduce interferance with phones and/or TVI at homes that are close to me? The theory being that the ground plane kit will help radiate my signal in more of an upward direction and not directly at a TV ant./phone lines of my neighbors. Does anybody have any thoughts on this subject that will help? Thanks in advance for your inputs. George (thunder) -- Don't do anything that I wouldn't, At least don't get CAUGHT!!!! From lwbyppp@epix.net Wed Jan 17 14:22:42 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Arrival angles Date: 13 Jan 1996 17:20:42 GMT Organization: LI Net (Long Island Network) Lines: 36 Message-ID: <4d8pla$865@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] At any given frequency, there are usually several paths a signal can follow from one point to another via the ionosphere. This means that there will usually be not one, but several arrival angles at any given time. This results in multipath wave interference effects, which cause the selective fading which is almost always present on an ionospheric signal path. This multipath problem also causes confusion and errors when trying to determine the direction of a null with low-resolution directional antennas such as loops or loopstick antennas. For this reason, a loopstick can not be trusted to give accurate skywave arrival-angle information. A better solution would be a variable-height antenna over a good ground screen on flat ground. Such an antenna could be directed if necessary, and then adjusted in height, noting the heights of nulls and optimum reception. Signal arrival angles can then be calculated from the antenna lobe angles corresponding to these heights. If necessary, angular resolution can be increased by using a stacked combination antenna. Bear in mind that at 1.8 MHz, such a system might require a tower (or towers) hundreds of feet tall! It might actually be more practical to place the antennas and receivers in remote-controlled model aircraft. If one has enough real estate, money and interest, a big multi-element array could be built, with enough resolution to really separate and identify the azimuth and elevation of the individual incoming components of a signal. This array need not be very high above the ground, but must be large in area compared to the wavelengths of interest, and the individual elements of the array must be fairly close to the nearby elements compared to the wavelength of interest. Adjustable phasing combiners can be used to produce directional patterns favoring different directions and arrival angles, and the information can be tabulated to show the arrival angles of the various signal components. If one really wanted to go all-out, a computerized system could convert the signals from the individual antenna elements into a real-time image. Bob Bruhns, WA3WDR, bbruhns@li.net From lwbyppp@epix.net Wed Jan 17 14:22:43 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!in2p3.fr!univ-lyon1.fr!jussieu.fr!news.forth.gr!news-ath.forthnet.gr!news.compulink.gr!usenet From: zliangas@compulink.gr (Zacharias Liangas) Newsgroups: rec.radio.amateur.antenna Subject: beam ant, project:Yr advice pls Date: Mon, 15 Jan 1996 22:10:53 GMT Organization: ME!!!!! Lines: 62 Sender: zliangas@athena.compulink.gr Distribution: world Expires: 10 days Message-ID: <4desgj$3ln@news.compulink.gr> Reply-To: zliangas@compulink.gr NNTP-Posting-Host: athena.compulink.gr X-Newsreader: Forte Free Agent 1.0.82 Dear friends I have a big doubt so I post this masage here First lemme tell you my system configuration fr the moment before I advise you my problem : I use a SONY ICF 7600D , a Lowe HF150 and a Philips Magnavox 2395 all are digital - wire antennas - of 6m sloped 60 deg paralel to az 120 deg - and a hor wire 13 m [aralel to 15 deg az .Both are TV antenna mast guides -home brewn ATU operating 2- 7 mHz for 20 - 5 dB respectively Palce of Reception ; Thessaloniki 40N 23E Due to my interest in SEA I have the particular interest for listening to the folowing radio stations and under the condidtions as below : - STM / V o Malaysia ( dir 120 dg az) in 15295 at mean levels of 2- 3 with QRMers as R Liberty fgrom 15290 at levels S4-5 ( abt 15-25 dB more) R F I from 15300 at nearly same as R L from varius hand made account-ments I understood that a great amount of signal abt 50-60% is lost due to possible reflexions coming from the city's mountains at an angle of 270-025 deg az -RRI Jakarta in 9680 at mean levels (not always receivable) of S1-2 Only V of Turkey is QRMer at 9675 but not always QRMing due to very low mod - R Singapore in 6000 at mean levels of S2to 3 with Deutschlandfunk in 6005 (S4) as the only QRMer or sometimes Radio Dubai at 6000 but at verylow level I asked the experts of my city for making a common antenna constru ction for these 3 freqs of a antenna individual per band , I also read many boks abt antennas found solutions but most of them are un- suitable for my place ( they were quad - X beam for example) as I have minimal room in the 7 level building and possibly can use only small constructions of no more than 4 x 4 sqm PLease help me , and suggest a good protype fr beam antenna(s) under the above conditions Thank you in advance zliangas@athena.compulink.forthnet.gr PLEASE ADIVSE ME YOUR OPINIONS BY EMAIL ONLY ! ====== test for 8-bit ćá÷áńéáň ëéÜăęáň Zakaria Liang! (namanya untuk kawan sahaja!) From lwbyppp@epix.net Wed Jan 17 14:22:44 1996 Path: news.epix.net!news.sprintlink.net!HiWAAY.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: 101332.2512@compuserve.COM (Jones Stephen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Butternut 80/40 or mfj 1792 or ? for 80/40? Date: 11 Jan 96 00:10:17 GMT Organization: ucsd usenet gateway Lines: 28 Message-ID: <960111001017_101332.2512_GHW34-1@CompuServe.COM> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hi All, I have been reading the mail for a few weeks as am new to internet. I have antennas for 6m and 10m, which are my main bands (6 ele Y 6m and 5 ele Y 10m o n 12 metre tilt over mast). I have a two acre plot with the house at the north west side of what is a rectangle plot. I like 80m dx and am considering buying a Butternut HF2v to put in the middle of the field with radials etc to give me low angle radiation on 80 and 40m. Is this the best solution? I notice that MFJ have brought out a 33 ft 40/80m vertical > has anyone tried one or has it been reviewed or compared with the Butternut? Would I be better putting up a wire antenna, using the 2 acres available? I have thought about putting a pole up a t the south east side of the rectangular plot and running out a one wave length wire for 80m, which I would use for 160,80, 40, 30, 17, and 15m with a tuner. Would the main lobes on 80m (Wire running north north west > south south east) be to the north west (for states) and north east (for VK,JA etc)? I could probably get the wire up about 50ft withou t spending anywhere near the cost of a Butternut HF2v. Other alternatives I have thought about are a 66ft guyed vertical made out of three 20ft alu scaffolding poles with radials in the middle of the field (But we get high win ds here on the Island of Anglesey) or a similar 60ft mast to support a 160m dipol e, or inverted V, and/or 80m slopers (but without any sophisticated switching systems as I am not very technically minded!). Any comments/suggestions would be gratefully received. Happy New Year from Steve GW0GEI 101332.2512@compuserve.com From lwbyppp@epix.net Wed Jan 17 14:22:45 1996 Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!feenix.metronet.com!news From: ken brookner Newsgroups: rec.radio.amateur.antenna Subject: butternut hf9v-x vs. hy-gain dx77 ?? Date: Sun, 14 Jan 1996 09:04:27 -0600 Organization: Texas Metronet, Inc (login info (214/705-2901 - 817/571-0400)) Lines: 24 Message-ID: <30F91B7B.3F644B8B@metronet.com> NNTP-Posting-Host: fw19.metronet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (X11; I; Linux 1.2.13 i486) CC: kenb i'm looking to purchase a multiband vertical and am tentatively down to two choices: the butternut hf9v-x with the CPK counterpoise kit or the hy-gain dx77. i wish that i had room for a radial system, but i live on a very wooded lot with a lot of rockwork around. there's just not enough room to run long radials. i have a storage shed that has some clear space above it so i could roof or mast mount a vertical there. it'd clear the trees by five or six feet on one side. the alternative spot is a grassy area roughly 30 feet by 45 feet, but it's a low spot on the lot and bordered by the house, a wooden fence, and the shed. if i used it, i'd have to ground mount. i realize that multiband verticals tend to be compromise solutions, but long dipoles (although i do have a 40 meter dipole up) are really out of the question. i can't mount them as high as they really out to be. so, i'm looking for experiences with the hf9v-x with the counterpoise kit and also with the dx77. i've just upgraded and am anxious to get under way. all input is appreciated! 73 ken brookner, n5lpi kenb@metronet.com From lwbyppp@epix.net Wed Jan 17 14:22:46 1996 Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!news.tacom.army.mil!ulowell.uml.edu!tribune.meitca.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.acadia.net!usenet From: "Jeffrey N. Gibbs" Newsgroups: rec.radio.amateur.antenna Subject: Cell phone antenna plans? Date: 14 Jan 1996 01:39:15 GMT Organization: AcadiaNet, Inc. Lines: 12 Message-ID: <4d9ms3$nbs@post.acadia.net> NNTP-Posting-Host: rck3.acadia.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:rec.radio.amateur.antenna?ALL Can anyone tell me how to build an high-gain cellular telephone antenna for my cabin, that will allow me to have reliable communications in a very marginal service area? Right now, I am getting less than one bar (of a possible four) on my car-mounted antenna. With such a poor signal I can't get voice calls out very well, let-alone fax/data modem calls. Please e-mail if you know/are willing to offer advice. THANKS! moose@acadia.net From lwbyppp@epix.net Wed Jan 17 14:22:48 1996 Path: news.epix.net!news.sprintlink.net!nwgw.infi.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Extended Double Zepp designs Date: 11 Jan 1996 17:58:15 GMT Organization: Intel Corporation, Chandler, AZ Lines: 24 Distribution: world Message-ID: <4d3j3n$tmj@chnews.ch.intel.com> References: NNTP-Posting-Host: scorpion.ch.intel.com In article , Pete Soper wrote: >Could anybody that has built the EDZ from the Handbook design comment about >whether the feedpoint impedance came out right? Am I missing something about >EZNEC in this situation, or is the model on target? I'd like to avoid >the inductance stub but would also like to plan for it if it's going to be >needed. Hi Pete, you've found the problem with models. No two antennas or locations are exactly alike. How about a procedure instead for perfectly tuning your antenna? Build a 6" piece of ladder-line, shorted on both ends and with a flashlight bulb soldered midpoint of one side. This will give you an indication of where the current nodes are (bright = current maximum). With a longer matching section (start with 80 degrees), load up your antenna as best you can with a tuner. Use the pickup loop to find the current node. Mine is at 72 degrees on my 20m EDZ. Cut the ladder-line a couple of feet longer than the current node. Use a choke on your coax and cut a few inches at a time off the matching section until you achieve minimum SWR at the transmitter. If you are extremely lucky, your SWR will be 9:1 on the ladder- line so the impedance at the end of the matching section will be exactly 50 ohms. In any case, an SWR of below 1.4:1 should easily be achieved. Anything below 2:1 is probably acceptable to your transmitter. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Wed Jan 17 14:22:49 1996 Path: news.epix.net!news.sprintlink.net!news.interport.net!usenet From: Michael Neidich Newsgroups: rec.antiques.marketplace,rec.antiques,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.shortwave,rec.radio.swap,rec.radio.scanner Subject: FS: '34-'35 Radio News Magazines Date: Sat, 13 Jan 1996 15:18:09 -0800 Organization: Interport Communications Corp. Lines: 5 Message-ID: <30F83DB1.423C@interport.net> NNTP-Posting-Host: neidich.port.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) Xref: news.epix.net rec.antiques.marketplace:11511 rec.antiques:32690 rec.radio.amateur.equipment:23732 rec.radio.amateur.misc:96869 rec.radio.amateur.antenna:18431 rec.radio.shortwave:68808 rec.radio.swap:55176 rec.radio.scanner:43738 For sale: 5 issues in perfect condition, "Radio News & Short Wave Radio" Nov. '34, Dec. '34, Jan. '35, Feb. '35, Apr. '35. $25 ea. ppd. First come first served. Enclose s.a.s.e. and I will return your check. See what radio listening was 60 years ago! K2ENN From lwbyppp@epix.net Wed Jan 17 14:22:50 1996 Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news From: {Gary} KF9CM turtle@wwa.com Newsgroups: rec.radio.amateur.antenna Subject: FS: Vhf High Power Duplexer Date: 13 Jan 1996 02:17:20 GMT Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com) Lines: 26 Message-ID: <4d74ng$gsp@kirin.wwa.com> NNTP-Posting-Host: vh1-035.wwa.com X-Newsreader: AIR News 3.X (SPRY, Inc.) I have for sale a Sinclair 4 cavity high power VHF duplexer Model# Q-202GC. T o my knowledge it's never been used. The cavities are inclosed in a steel cabnet w ith (3) three conectors on the side. The frequency tuning range is from 132 to 17 4 Mhz and I have the complete tuning manual. The Electrical Specifications are as follows: INSERTION LOSS= Tx 1.5 db Rx 1.5 db ISOLATION, Tx Noise at Rx frequency = 80 db Tx Frequency at Rx Terminal = 80db MINIMUM ISOLATION Between Tx and Rx Frequencies = 50db MINIMUM SEPARATION = 500Khz This is a top of the line duplexer and lists from Sinclair for $1730.... I wil l take $850 or best offer. This is for local pickup or I can deliver within a 100 mile rad ius of Chicago Il. You can "E" mail me at turtle@wwa.com From lwbyppp@epix.net Wed Jan 17 14:22:51 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: HOPTASV@ix.netcom.com(Scott Hopta ) Newsgroups: rec.radio.amateur.antenna Subject: Gap Antennas Date: 16 Jan 1996 07:11:00 GMT Organization: Netcom Lines: 17 Message-ID: <4dfj24$7rm@ixnews2.ix.netcom.com> NNTP-Posting-Host: als-il1-27.ix.netcom.com X-NETCOM-Date: Mon Jan 15 11:11:00 PM PST 1996 Hello Everyone: I looking at purchasing a vertical antenna and was wondering if anyone has used any of the Gap antennas and if you can tell me how they perform. I saw thier add in the December QST and like the idea of no traps ... etc. It looks like it also has a bigger band width then other verticals. Any thoughts would be appreciated. Thanks Scott Hopta (N0NXY) From lwbyppp@epix.net Wed Jan 17 14:22:51 1996 Path: news.epix.net!news.sprintlink.net!tncnet.com!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!columba.udac.uu.se!sabik!t90jwe From: t90jwe@sabik.tdb.uu.se (Johan Wennerberg) Newsgroups: rec.radio.amateur.antenna Subject: Re: GPS antenna design Date: 15 Jan 1996 15:57:25 GMT Organization: A poorly-installed InterNetNews site Lines: 8 Message-ID: <4ddth5$vdo@columba.udac.uu.se> NNTP-Posting-Host: sabik.tdb.uu.se X-Newsreader: TIN [version 1.2 PL2] I would like some hints on constructing antennas and antenna amplifiers for my Garmin 45 GPS receiver. If anyone have information on where I can get circuit descriptions I would be grateful to know. Johan Wennerberg email: jowe@teknikum.uu.se From lwbyppp@epix.net Wed Jan 17 14:22:52 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!news.pixi.com!usenet From: Pat & Adaire Mason Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: Great circle programs: Internet link Date: Sat, 13 Jan 1996 12:48:34 -1000 Organization: Pacific Information eXchange, Inc. Lines: 33 Message-ID: <30F836C2.52EF@pixi.com> NNTP-Posting-Host: godzilla20.pixi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) CC: billhale@micron.net Xref: news.epix.net rec.radio.shortwave:68831 rec.radio.amateur.antenna:18441 Aloha.... As promised in a former article, here is the info regarding great circle computational programs on the 'Net: Location: Navigation Archive Directory http://www.ronin.com/navigation/archives.html I found a couple of good programs there. One, called "Bearing" has a table full of callsign prefixes (ham) and latlon for many cities worldwide. It does calculate bearing, but seems to not enjoy crossing the date line and gives strange results there. However, it seems OK if you are not crossing the line, and its database of coordinates is a great reference. My favorite is ANSER's "Way2go", in which you type in coordinates, either decimal form or DMS and you can compute the bearing and distance. Or if you know the bearing and distance and the origin, you can get the target coordinates. Anyway, it works the best and gives good results, even over the date line. I generally pull up Bearing and get my coordinates from them and use Way2go for the computation. Both files are shareware and are $7 and $15 respectively. Out here in the Pacific, such programs are well worth it for me, as I do not have a Great Circle Map. If anyone finds these useful, I'd be interested to know. Happy DX.... Patrick Mason National Radio Club Member Mililani, Hawai'i newlife@pixi.com From lwbyppp@epix.net Wed Jan 17 14:22:53 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!news.texas.net!chilesp From: chilesp@intrepid.net (Pat Chiles) Newsgroups: rec.radio.amateur.antenna Subject: HELP WITH BEVERAGE ANTENNA MADE FROM SLINKIES Date: 14 Jan 1996 02:29:20 GMT Organization: Texas Networking, Inc. Lines: 5 Message-ID: <4d9pq0$b6i@news.texas.net> NNTP-Posting-Host: chilesp.intrepid.net X-Newsreader: News Xpress Version 1.0 Beta #3 I would appreciate it if someone could supply me with a magazine reference or information on how to build beverage antennas using toy slinkies. One local ham has given me info on the design he uses for an 80 foot antenna. I am trying to locate additional information. Direct reply can be sent via chilesp@intrepid.net. Pat, AA8NY From lwbyppp@epix.net Wed Jan 17 14:22:54 1996 Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!uunet!in1.uu.net!news.spss.com!uchinews!vixen.cso.uiuc.edu!howland.reston.ans.net!usc!news.cerf.net!ni1.ni.net!xband.ni.net!user From: blanton@ni.net (J. L. Blanton) Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP WITH BEVERAGE ANTENNA MADE FROM SLINKIES Date: Sun, 14 Jan 1996 10:21:04 -0800 Organization: Network Intensive Lines: 17 Message-ID: References: <4d9pq0$b6i@news.texas.net> NNTP-Posting-Host: xband.ni.net In article <4d9pq0$b6i@news.texas.net>, chilesp@intrepid.net (Pat Chiles) wrot e: > I would appreciate it if someone could supply me with a magazine > reference or information on how to build beverage antennas using toy > slinkies. One local ham has given me info on the design he uses for > an 80 foot antenna. I am trying to locate additional information. > Direct reply can be sent via chilesp@intrepid.net. Pat, AA8NY A beverage using slinkies? That doesn't sound right. The beverage antenna is a travelling wave antenna that is essentially a leaky transmission line. It works on different principles than antennas that benefit from inductive loading. An antenna using a slinky might tune up and radiate halfway well but I don't think it would be a true beverage antenna. 73, Lee, WA8YBT/6 From lwbyppp@epix.net Wed Jan 17 14:22:55 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet From: "C. J. Hawley" Newsgroups: rec.radio.amateur.antenna Subject: Re: Help for 450 ohm feed Zeep antenna Date: Sun, 14 Jan 1996 08:33:37 -0600 Organization: University of Illinois at Urbana Lines: 20 Message-ID: <30F91441.4CDA@aries.scs.uiuc.edu> References: <4d2kq1$3o8@horus.mch.sni.de> NNTP-Posting-Host: antwerp-4.slip.uiuc.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) Cecil Moore wrote: > > Frits Jensen writes: > > >I intend to hang up a dipol "as long as possible, ca. 150ft", and feed it w ith > >450 ohm ladderline. The feeder will be about 100ft long. I have a FC901 tun ersnip > I've had a lot of experience with this type of antenna. My present > antenna is the best I've ever had. The secret of it's ease of use > and performance is a few stubs which are switched in automatically > depending on the band. The band info out of my IC-745 is monitored > by some logic and switches in the correct stub automatically. The > stub kills the reflections at the stub connection point and from > there to the balun, the line is flat. No more balun losses, no more > antenna tuner losses. The improvement is amazing. > > 73, Cecil, KG7BK, OOTC This is interesting. I thought that the one you described previously was passi vely switched. Could you tell us more (numbers)? 73, Chuck, KE9UW From lwbyppp@epix.net Wed Jan 17 14:22:56 1996 Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.mch.sni.de!horus.mch.sni.de!news From: frits.jensen@mch.sni.de (Frits Jensen) Newsgroups: rec.radio.amateur.antenna Subject: Help for 450 ohm feed Zeep antenna Date: 11 Jan 1996 09:21:05 GMT Organization: SNI Lines: 10 Message-ID: <4d2kq1$3o8@horus.mch.sni.de> NNTP-Posting-Host: potd1231.mch.sni.de Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.7 I intend to hang up a dipol "as long as possible, ca. 150ft", and feed it with 450 ohm ladderline. The feeder will be about 100ft long. I have a FC901 tuner wich do not accept open wire. What do I do. 6:1 ballun?. What type of core, and how do I wind it up (diagram). Will it handle 1kw? Can I expect decent results on 160M with the antenna 50 ft up in the air? Hpe it was no to many questions HI. Best ´73 de DL4MHU, OZ2Q Frits in Munich From lwbyppp@epix.net Wed Jan 17 14:22:57 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Help for 450 ohm feed Zeep antenna Date: Sun, 14 Jan 96 12:32:19 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 29 Message-ID: References: <4d2kq1$3o8@horus.mch.sni.de> <30F91441.4CDA@aries.scs.uiuc.edu> NNTP-Posting-Host: bos1d.delphi.com X-To: "C. J. Hawley" "C. J. Hawley" writes: >This is interesting. I thought that the one you described previously was pass ively >switched. Could you tell us more (numbers)? Hi Chuck, Passive switching was, as W8JI put it, "a pain". And it's not logical for someone who works for Intel to be satisfied with passive switching. :-) On my 102 ft dipole fed with 300 ohm home-made open feed line, the parallel stub points for 40m and 20m through 10m all fall within a 10 ft section from 75-85 feet from the antenna. I got a 10 ft piece of 1x2 board and mounted the final 300 ohm section rigid on my patio. I interface there to the 4:1 balun and coax. I picked up a bunch of open-frame relays for $3 each suitable for switching my 600w. They have 24vdc coils but I also picked up a $3 transformer at the same surplus place. The feed line is mounted on one side of the 1x2 and the relays and stubs are mounted on the other. A multi-conductor cable runs the length of the 1x2 and carries the 24vdc from the shack to the relays. My IC-745 automatically puts out 1v for 10m, 2v for 12m, ... 8v for 160m. A few comparitors drive 2n2222's to deliver ground for one of the relays at a time. I just got it operational last night and it works great. At the shack, it looks like the antenna is resonant and near- perfectly matched on all the bands - and it is!!! 73, Cecil, KG7BK, OOTC PS: The 75m stub point is 35-40 ft. from the antenna and requires a relay or two mounted at that point so 75m is an exception to the relays on the patio. Same holds true for 30m but I haven't equipped my system for that band. One advantage of this system is one can chose not to use a stub on unfrequently accessed bands and revert to the antenna tuner on those bands. From lwbyppp@epix.net Wed Jan 17 14:22:59 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!van-bc!unixg.ubc.ca!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Help for 450 ohm feed Zeep antenna Date: Sun, 14 Jan 96 21:06:34 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 44 Message-ID: References: <4d2kq1$3o8@horus.mch.sni.de> <4dc518$hnk@gaia.ns.utk.edu> NNTP-Posting-Host: bos1g.delphi.com X-To: wynnt wynnt writes: >Are you switching in closed or open stubs or both? How do you size >the stubs? Are they 450 ohm line as well? One stub required for each >band? How broadbanded are the stubs? How about some ASCII art to >describe the setup? A 1/4 wave stub on 80 meters could get unweildy. >How do you handle the length? Stubs are both closed and open and I also use parallel capacitors instead of open stubs for the lower bands. I size the stubs from a Smith chart, make them longer than necessary, and start chopping while monitoring the 50 ohm SWR. All my transmission lines are 300 ohms, even the #10 and #12 bare copper runs. In general, one stub or cap is required for each band. I define bandwidth as the frequencies between SWR points of 3:1. On 75m it is 200 kc and a little better than that on 40m. On 20m one stub covers the entire band because the 102 ft dipole is resonant there. I'll probably install two sets of parallel caps on 75m. ASCII art is not necessary. Here are the locations and stub lengths for my 102 ft dipole at 30 ft high fed with 300 ohm ladder-line having a VF of 0.80. All locations are measured from the antenna. At about 85 ft, I have a 4:1 balun and then coax the rest of the way to the shack. 75m - parallel 260 pf cap at 36 ft, 40m - 6 ft shorted stub at 82 ft, 30m - 4 ft shorted stub at 54 ft, 20m - 7 ft shorted stub at 77 ft, 17m - 80 pf parallel cap at 79 ft, 15m - 2.2 ft shorted stub at 82 ft, 12m - 6 ft open stub at 77 ft., 10m - 5.5 ft open stub at 81 ft. 102 ft is the standard G5RV length. Many hams have discarded their coax in favor of 300 ohm ladder-line. For those hams, the above figures may be close (but no cigar). For hams with different length dipoles, ELNEC or EZNEC will give a reasonable approximation to the starting points. After installing the stubs or caps, I am no longer at the mercy of the unknown. I know I am getting low losses in my balun and tuner or pi-network. TechnoLogic Concepts (tlcdhconsult@delphi.com) is working on an application note on this subject which should be available in about a month. They will also have available pickup loops and 100w 300 ohm dummy loads. 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Wed Jan 17 14:23:00 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.uoregon.edu!news.orst.edu!news.cs.indiana.edu!mcmcnews.cr.usgs.gov!news.er.usgs.gov!stc06.ctd.ornl.gov!cs.utk.edu!gaia.ns.utk.edu!usenet From: wynnt Newsgroups: rec.radio.amateur.antenna Subject: Re: Help for 450 ohm feed Zeep antenna Date: 14 Jan 1996 23:53:12 GMT Organization: University of Tennessee Lines: 21 Message-ID: <4dc518$hnk@gaia.ns.utk.edu> References: <4d2kq1$3o8@horus.mch.sni.de> NNTP-Posting-Host: tchm02a13.rmt.utk.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Cecil Moore wrote: > >I've had a lot of experience with this type of antenna. My present >antenna is the best I've ever had. The secret of it's ease of use >and performance is a few stubs which are switched in automatically >depending on the band. > >73, Cecil, KG7BK, OOTC Hmmm, unlike some of the other fluster, bluster and blather that goes on here, when *you* say "...the best..." it means something. Please tell us more about this setup. Are you switching in closed or open stubs or both? How do you size the stubs? Are they 450 ohm line as well? One stub required for each band? How broadban ded are the stubs? How about some ASCII art to describe the setup? A 1/4 wave st ub on 80 meters could get unweildy. How do you handle the length? Best regards, wynnt From lwbyppp@epix.net Wed Jan 17 14:23:01 1996 Path: news.epix.net!news.sprintlink.net!news.seanet.com!debenglish.seanet.com!debenglish From: debenglish@debenglish.seanet.com (Dennis E. English) Newsgroups: rec.radio.amateur.antenna Subject: Help to design an AM antenna for remote areas Date: Sat, 13 Jan 1996 23:23:30 GMT Organization: OSD, Inc. Lines: 14 Message-ID: NNTP-Posting-Host: debenglish.seanet.com Summary: I need help designing an antenna for AM listening in remote areas Keywords: Antenna X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Hello everyone, I am new to using news groups so please be patient. I saw an article about 15 years ago that described how to build an AM Band antenna for use in remote areas. The plans told of a homemade coil that had a ground on one end and an antenna on the other. It told the length of the antenna wire, type and gauge. The coil is placed in proximity of an AM radio and it boasts the signal. Does anyone out there know how to design one of these? Or, can you tell me where to look for design data? Thanks, From lwbyppp@epix.net Wed Jan 17 14:23:02 1996 Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!sundog.tiac.net!shore!news From: jjmartin@shore.net (Jim Martin) Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP! R-7 Problem? Date: Tue, 16 Jan 1996 05:36:16 GMT Organization: WK1V Lines: 15 Message-ID: <4df2td$h9v@shore.shore.net> References: <4chkv1$lq6@fcnews.fc.hp.com> <4cq94p$i64@odo.PEAK.ORG> Reply-To: jjmartin@shore.net NNTP-Posting-Host: slip-7-22.shore.net X-Newsreader: Forte Free Agent 1.0.82 >:Bret McKee (mckee@fc.hp.com) wrote: >:: I had a trap die (open) in my R7 this fall. The antenna worked fine on >:: 10/12/15 meters, but had an infinite SWR on all the lower bands. The 17 >:: meter trap was to blame, and Cushcraft was very responsive. If your >:: antenna will not load up on 10 meters, you don't have any open traps, >:: because the 10 meter element doesn't use any traps, although it still >:: goes through the mystic black box at the bottom. Now you know what happens to an R7 when you use a transmatch and operate it on 80 meters....wonder if you told Cushcraft that is what you did...? :) jjm From lwbyppp@epix.net Wed Jan 17 14:23:04 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk From: "Anthony R. Gold" Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP!! Why is it that.... Date: Sat, 13 Jan 96 09:30:24 GMT Organization: Microvest Limited, London Lines: 21 Message-ID: <821525424snz@microvst.demon.co.uk> References: <4d722c$sf5@news1.halcyon.com> Reply-To: tgold@microvst.demon.co.uk X-NNTP-Posting-Host: microvst.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: microvst.demon.co.uk In article <4d722c$sf5@news1.halcyon.com> ki7zd@coho.halcyon.com "Randy Seacat" writes: > Something is wrong, I have a g5RV, and suddenly, its not working correctly. > I have checked all connections, all seem ok. > > Here is the deal. > > When I connect the sheild side of the coax to the tuner, ALLMOST ALL my recv . > goes away. Running just the center of the coax works awsome. > > Whats up here? Check with a VOM for a short between your coax inner and braid. Regards, -- Tony - G3SKR / AA2PM email: tgold@panix.com tgold@microvst.demon.co.uk packet: g3skr@n0ary.#nocal.ca.usa.na From lwbyppp@epix.net Wed Jan 17 14:23:04 1996 Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news1.halcyon.com!coho!ki7zd From: ki7zd@coho.halcyon.com (Randy Seacat) Newsgroups: rec.radio.amateur.antenna Subject: HELP!! Why is it that.... Date: 13 Jan 1996 01:31:56 GMT Organization: Northwest Nexus Inc. Lines: 20 Message-ID: <4d722c$sf5@news1.halcyon.com> NNTP-Posting-Host: coho.halcyon.com Hello, Something is wrong, I have a g5RV, and suddenly, its not working correctly. I have checked all connections, all seem ok. Here is the deal. When I connect the sheild side of the coax to the tuner, ALLMOST ALL my recv. goes away. Running just the center of the coax works awsome. Whats up here? THanks for any and all help -- /-/-/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Amateur Radio Station Inet: ki7zd@halcyon.com | KI7ZD | WWA CN87 73's _._ .. __... __.. _.. "If RST > 519, Reduce Power!" From lwbyppp@epix.net Wed Jan 17 14:23:06 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!raynet.demon.co.uk From: Greg Mossop Newsgroups: rec.radio.amateur.antenna Subject: HELP: Patch Antenna Design. Date: Sat, 13 Jan 96 22:00:07 GMT Organization: West Cheshire RAYNET Lines: 22 Message-ID: <821570407snz@raynet.demon.co.uk> Reply-To: Gregm@raynet.demon.co.uk X-NNTP-Posting-Host: raynet.demon.co.uk X-Newsreader: Demon Internet Simple News v1.30 X-Mail2News-Path: raynet.demon.co.uk Hi, I am trying to make a microstrip patch antenna, initially to be linearly polarised on the 70cm band and then perhaps a little play with circular polarisation. I have had one attempt so far, etching a square patch onto fibre glass PCB. I calculated the velocity factor and made the patch an electrical quarter wavelength square fed with 50 ohm microstrip in the middle of one side. Well ... the SWR is sky high & just to prove the point it doesn't even seem to hear the local repeater :-( Can anyone point me to a reference for the design of patch antennas ? Most of the books I have got analyse the performance of these antennas but are a little short on practical construction data. Tnx. -- +-------------------------------------+--------------------------------------- + | Greg Mossop G0DUB | 'Even logic must give way to physics' | | Internet: Gregm@raynet.demon.co.uk | - Spock - Star Trek VI | +-------------e-mail pgp@raynet.demon.co.uk for PGP2.6i key------------------- + From lwbyppp@epix.net Wed Jan 17 14:23:06 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!gatech!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!news.nas.com!news From: paulb@az.com Newsgroups: rec.radio.amateur.antenna Subject: How high? Date: Sun, 14 Jan 1996 08:09:57 GMT Organization: Network Access Services, Inc. Lines: 5 Message-ID: <4dadnp$9an@barad-dur.nas.com> NNTP-Posting-Host: 204.57.139.114 X-Newsreader: Forte Agent .99c/32.126 I have a TV antenna that is in a wide open cow field but doesn't pick up very good reception. Their aren't any trees blocking the antenna, which is about 3 0 ft. high, but I still wonder if I might pick up some better signals if I raise the antenna up higher. How much will t his help? Thanks, From lwbyppp@epix.net Wed Jan 17 14:23:08 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!degreene From: degreene@heurikon.com (David Greene) Newsgroups: rec.radio.amateur.antenna Subject: HT antennas Date: 15 Jan 96 21:16:13 GMT Organization: Heurikon Corporation Lines: 22 Message-ID: NNTP-Posting-Host: copernicus.heurikon.com Summary: HT antennas Keywords: HT antennas X-Newsreader: NN version 6.5.0 #16 (NOV) Hello, I'm looking for suggestions for a good aftermarket dual band (144 & 440) HT antenna for improved performance over the stock antennas, if that is possible. There are some in the catalogs, but the gain claims seem to be exagerated, so it's difficult to determine what the better one's are. I did see some that are rather large (telescoping). Are there any problems with coneecting these to the smaller HT's (ie. as in breaking the connector). Thanks, Dave AA9BI degreene@heurikon.com -- Dave Greene Heurikon Corp. (800) 356-9602 From lwbyppp@epix.net Wed Jan 17 14:23:09 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!Portugal.EU.net!news.rccn.net!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: I'm looking for info on putting up antennas. Date: 16 Jan 1996 12:05:03 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 19 Message-ID: <4dg49f$3414@info4.rus.uni-stuttgart.de> References: <4df1f9$gt5@cloner3.netcom.com> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >I am wanting to put up a beam antenna for 2m. I was wondering what >information is available on the net concerning this subject >(gudilines, advice, how-to's, etc.) Thanks. No, there is none. And there is no reason for having one, since the general information can be found in many books amd journals, which have as yet not been fully rendered obsolete in cyberspace. However, if you specify your question as follows, someone might be able to help: What do you want to work? FM? SSB? OSCAR? What boom length and height above surrounding obstacles are practical for you? Buy or build? 73, Moritz DL5UH From lwbyppp@epix.net Wed Jan 17 14:23:09 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: travisp@ix.netcom.com (Gerald Phillips) Newsgroups: rec.radio.amateur.antenna Subject: I'm looking for info on putting up antennas. Date: Tue, 16 Jan 1996 02:13:06 GMT Organization: Netcom Lines: 7 Message-ID: <4df1f9$gt5@cloner3.netcom.com> NNTP-Posting-Host: ix-tf3-25.ix.netcom.com X-NETCOM-Date: Mon Jan 15 6:10:49 PM PST 1996 X-Newsreader: Forte Free Agent 1.0.82 I am wanting to put up a beam antenna for 2m. I was wondering what information is available on the net concerning this subject (gudilines, advice, how-to's, etc.) Thanks. KE4MBD From lwbyppp@epix.net Wed Jan 17 14:23:11 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!newserve!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!bill From: bill@alfalfa.pas.rochester.edu (Bill VanRemmen) Subject: Info request on DDRR antenna Message-ID: <1996Jan11.185430.25991@galileo.cc.rochester.edu> Sender: news@galileo.cc.rochester.edu Nntp-Posting-Host: alfalfa.pas.rochester.edu Organization: University of Rochester Computing Center X-Newsreader: TIN [version 1.2 PL0] Date: Thu, 11 Jan 96 18:54:30 GMT Lines: 19 I am thinking of building a DDRR antenna for 10 meters since I live in an apartment with a 'no outside antenna' policy. It looks like the 10m version in the ARRL Antenna Book will just about fit on TOP of the air- conditioner box, with some overhang. I figure, if it doesn't look like an antenna from the ground, maybe no one will complain. Does anyone have any experience with this design? Any idea how it performs versus a dipole? Is the radiation vertical or horizontally polarized? Any problem with putting a 2m ring inside the 10m ring? -- My opinions. No one elses. Get your own! ----------------------------------------------------------------------------- Oh, I'm a sysadmin, and I'm ok. | Bill VanRemmen, KA2WFJ I work all night and I work all day. | bill@pas.rochester.edu I knock back Cokes, I skip my lunch, | http://www.pas.rochester.edu/~bill I'm glued to the VDT! | ----------------------------------------------------------------------------- From lwbyppp@epix.net Wed Jan 17 14:23:11 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip7.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: Info request on DDRR antenna Date: Fri, 12 Jan 1996 21:40:20 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 26 Message-ID: References: <1996Jan11.185430.25991@galileo.cc.rochester.edu> NNTP-Posting-Host: usr4ip7.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <1996Jan11.185430.25991@galileo.cc.rochester.edu> bill@alfalfa.pas. rochester.edu (Bill VanRemmen) writes: >From: bill@alfalfa.pas.rochester.edu (Bill VanRemmen) >Subject: Info request on DDRR antenna >Date: Thu, 11 Jan 96 18:54:30 GMT >I am thinking of building a DDRR antenna for 10 meters since I live in an >apartment with a 'no outside antenna' policy. It looks like the 10m >version in the ARRL Antenna Book will just about fit on TOP of the air- >conditioner box, with some overhang. I figure, if it doesn't look like >an antenna from the ground, maybe no one will complain. >Does anyone have any experience with this design? Any idea how it performs >versus a dipole? Is the radiation vertical or horizontally polarized? >Any problem with putting a 2m ring inside the 10m ring? Bill: The DDRR is really just a (very) short vertical with lots of top loading. Is your A/C wall mounted or do you have roof access? If the latter, I would sure try something else. As to the 2M ant, I'd use a duckie on a mag mount before doing the DDRR. The nearer you are to full size the better. Good Luck Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:23:12 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!msunews!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail From: a313@Lehigh.EDU Newsgroups: rec.radio.amateur.antenna Subject: Re: Info request on DDRR antenna Date: 12 Jan 1996 07:32:24 -0500 Lines: 30 Message-ID: <4d5kco$2sca@ns5-1.CC.Lehigh.EDU> NNTP-Posting-Host: ns5-1.cc.lehigh.edu In article <1996Jan11.185430.25991@galileo.cc.rochester.edu>, bill@alfalfa.pas .r ochester.edu (Bill VanRemmen) writes: >I am thinking of building a DDRR antenna for 10 meters since I live in an >apartment with a 'no outside antenna' policy. It looks like the 10m >version in the ARRL Antenna Book will just about fit on TOP of the air- >conditioner box, with some overhang. I figure, if it doesn't look like >an antenna from the ground, maybe no one will complain. > >Does anyone have any experience with this design? Any idea how it performs >versus a dipole? Is the radiation vertical or horizontally polarized? >Any problem with putting a 2m ring inside the 10m ring? > >-- > > My opinions. No one elses. Get your own! >----------------------------------------------------------------------------- >Oh, I'm a sysadmin, and I'm ok. | Bill VanRemmen, KA2WFJ >I work all night and I work all day. | bill@pas.rochester.edu >I knock back Cokes, I skip my lunch, | http://www.pas.rochester.edu/~bill >I'm glued to the VDT! | >----------------------------------------------------------------------------- > I built one back in the 60's when an article concerning the design appeared in CQ Magazine. The 10 meter version was extremely narrow banded and as a result did not load worth a tinkers dam. The swr was outragous outside od a 5kHz bandwith. I also experienced sever arcing of the capacitor every time the swr went nuts. Also as a result I never made a single qso with it. I hope yours works better than mine did. 73's Dick K8WHA From lwbyppp@epix.net Wed Jan 17 14:23:14 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ecn.bgu.edu!newspump.wustl.edu!news.starnet.net!wupost!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.antenna Subject: Re: J-Pole Date: Sat, 13 Jan 1996 15:32:56 GMT Organization: Inlink Lines: 21 Message-ID: <4d8jie$eec@news1.inlink.com> References: <30f489f4.1451749@news.calon.com> NNTP-Posting-Host: slip11.inlink.com X-Newsreader: Forte Free Agent 1.0.82 wa2ise@netcom.com (Robert Casey) wrote: >In article <30f489f4.1451749@news.calon.com> elewis@dsp.com (Edward Lewis) wr ites: >>I have plans for a 2 meter j-pole constructed from 1/2 inch copper >>pipe. I have a piece of 1 inch pipe I would like to use, if I keep all >>deminsions the same would the antenna tune to the sams frequency as >>the 1/2 antenna. >Make the spacing of the two pipes (the bottom part of the J) twice as wide, >and keep the lengths the same, should work. Expect to do a bit of "fine >tuning" of the location of the feedpoint to get good SWR. If your moving from 1/2 inch all the way up to 1 inch tube, you will have to recalculate the measurements taking into consideration the K factor for the diameter of the pipe. The space between the vertical and the tuning stub remains exactly the same. See Copper Cactus at http://www.inlink.com/~raiar Gary KG0ZP From lwbyppp@epix.net Wed Jan 17 14:23:14 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!else.net!innuendo.tlug.org!telly!lethe!geac!onramp.ca!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: J-Pole Date: 11 Jan 1996 18:49:44 GMT Organization: Hewlett Packard Corvallis Site Lines: 19 Message-ID: <4d3m48$1n9@hpcvsnz.cv.hp.com> References: <30f489f4.1451749@news.calon.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Edward Lewis (elewis@dsp.com) wrote: : I have plans for a 2 meter j-pole constructed from 1/2 inch copper : pipe. I have a piece of 1 inch pipe I would like to use, if I keep all : deminsions the same would the antenna tune to the sams frequency as : the 1/2 antenna. Expect that larger diameter conductors will give lower resonant frequencies, lower impedances (for the "end fed half wave" of the J-pole), and wider SWR bandwidths. The transmission line part should be the same, so you can tune it by adjusting the feedline tap point (up slightly) and the upper section length (slightly shorter) after you build it, to get to lowest SWR. Constructed according to the 1/2" pipe dimensions, assuming they were right, you'd probably find the lowest SWR down at the bottom of the band, and you can make small adjustments to bring things in. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Jan 17 14:23:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netnews From: hoptasv@ix.netcom.com(Scott Hopta ) Newsgroups: rec.radio.amateur.antenna Subject: J-pole or Di-pole Date: 16 Jan 1996 08:01:44 GMT Organization: Netcom Lines: 12 Message-ID: <4dfm18$3js@ixnews7.ix.netcom.com> NNTP-Posting-Host: als-il1-04.ix.netcom.com X-NETCOM-Date: Tue Jan 16 12:01:44 AM PST 1996 He Everyone: Which would be a better antenna to build for 2 meter and/or 440. And also what would be the difference in performance. Would you build a J-pole or a vertical Di-pole. Any info would be appreciate. Thanks Scott Hopta From lwbyppp@epix.net Wed Jan 17 14:23:16 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!crl.dec.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Jan QST Exploring RF Date: 12 Jan 1996 05:15:49 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4d5ccl$8li@newsbf02.news.aol.com> References: <4cifk9$itt@news.azstarnet.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi, I want to get some comments from others on the January Exploring RF that discusses an attenuator computer modeling error. Could someone else please read the article and tell me what they "get out of it"? I've been trying to understand the author's points for a month now, and I fail to understand what the point was, besides he modeled the circuit incorrectly. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:23:18 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: LINEAR TUNING RODS Date: 15 Jan 1996 10:46:14 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 34 Sender: root@newsbf02.news.aol.com Message-ID: <4ddss6$s86@newsbf02.news.aol.com> References: <4dd4t0$1h3@midland.co.nz> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4dd4t0$1h3@midland.co.nz>, John writes: >Can anyone tell me where I can read the design parameters for linear >tuners and the theory of operation? They seem to be increasing in use for >multiband verticals but none of my handbooks have any dope. > > Hi John, "Linear loading" stubs can operate in two modes, one is efficient and the other isn't. The more efficient mode is where it acts as a decoupling stub allowing the antenna to be used on a higher band. In that mode it generally physically appears as a 1/4 wave shorted stub. So it allows use of a long element on a higher frequency band by decoupling the unwanted length of the antenna. One big advantage is a long element can be made without any insulators, and stll be made to work on higher bands. In these cases the stub is usually a 1/4 wl long electrically at the decoupling frequency. The other use is where the linear loading operates like an inductor and makes the antenna look longer. It is not as efficient as a conventional coil loaded antenna, but the bandwidth can be a bit better (mostly due to the additional losses it adds). In these cases the stub length has to calculated like a shorted transmission line to the length required to cancel the antennas capacitive reactance. Sections on transmission lines will give the formulas, such as in Walt Maxwell's book Reflections. But remember, a coil is generally more efficient if you want to load a short antenna. Hope this helps, Tom From lwbyppp@epix.net Wed Jan 17 14:23:19 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.antenna Subject: Re: Log Periodic Transmission Lines Date: 12 Jan 1996 17:05:25 GMT Organization: Hewlett-Packard Lines: 31 Message-ID: <4d64cl$lh@hpscit.sc.hp.com> References: <4d1lp9$dov@tpsun.taranaki.ac.nz> <4d3lk9$1n9@hpcvsnz.cv.hp.com> NNTP-Posting-Host: hpscrj.scd.hp.com In article <4d3lk9$1n9@hpcvsnz.cv.hp.com>, Tom Bruhns wrote : >Graeme Jury (g.jury@taranaki.ac.nz) wrote: >: Can anyone help with the formula for a transmission line made from square >: tubing. I am using this in the construction of an LP antenna and suspect th at >: it will be the same as 2 parallel plate lines but the only formula I can fi nd >: is for round transmission line. Tnx for reading > >From Howard Sams' "Reference Data for Engineers", seventh edition, Pg. 29-20: > >"H. Single [round] wire, square enclosure [wire diameter = d, inside side >length of square enclosure = D] Yes, but what he needs is the Zo of a *square* "wire" over a ground plane. From this, he can get Zo of a pair of square wires (twice as much). This is known as slab line. You might try Mattei, Young and Jones' handbook for this one. If not in the handbook itself, you might find some references to IRE/IEEE Transactions that you can look up. Also look at papers on comb line filters made with square rods. You can deduce Zoo and Zoe from the coupling capacitance tables. From that you can get Zo. As an approximation, you might assume that the Zo of a pair of square wires is the sames as a pair of round wires of equal surface area. Then use Zo = 60 ln D/d. I'll bet that the approximation is very close for high Zo and only deviates significantly below 150 ohms. I wouldn't trust the parallel plate model for square "plates". Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Wed Jan 17 14:23:20 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!else.net!innuendo.tlug.org!telly!lethe!geac!onramp.ca!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: Log Periodic Transmission Lines Date: 11 Jan 1996 18:41:13 GMT Organization: Hewlett Packard Corvallis Site Lines: 34 Message-ID: <4d3lk9$1n9@hpcvsnz.cv.hp.com> References: <4d1lp9$dov@tpsun.taranaki.ac.nz> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Graeme Jury (g.jury@taranaki.ac.nz) wrote: : Can anyone help with the formula for a transmission line made from square : tubing. I am using this in the construction of an LP antenna and suspect tha t : it will be the same as 2 parallel plate lines but the only formula I can fin d : is for round transmission line. Tnx for reading From Howard Sams' "Reference Data for Engineers", seventh edition, Pg. 29-20: "H. Single [round] wire, square enclosure [wire diameter = d, inside side length of square enclosure = D] Zo approx= [138*log10(rho) + 6.48 - 2.34*A - 0.48*B - 0.12*C] * epsilon^0.5 where rho = D/d A = ( 1 + 0.405*rho^-4 ) / ( 1 - 0.405*rho^-4 ) B = ( 1 + 0.163*rho^-8 ) / ( 1 - 0.163*rho^-8 ) C = ( 1 + 0.067*rho^-12 ) / ( 1 - 0.067*rho^-12 ) epsilon = relative dielectric constant of the dielectric " = 1 for air dielectric (Hopefully I haven't made too many [any] typos transcribing this...) -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Jan 17 14:23:21 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet Newsgroups: rec.radio.amateur.antenna Subject: Looking for SG-230 or similar Message-ID: From: Bill Harwood Date: Tue, 16 Jan 1996 20:31:07 GMT Sender: usenet@avalon.chinalake.navy.mil (NAWS news admin) Organization: NAWS, China Lake, CA Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:rec.radio.amateur.antenna Lines: 14 I need to find an SGC-230 feed point tuner. Would prefer a later moidel. I would also consider another manufacturers equivelent tuner. Please reply by e_mail or phone at (619) 446-6927 Thanks \------------------------------------------------------/ \ Bill Harwood U play it, I'll dance it / \ AB6DY or / \ I'll play it, U dance it / \----------------------------------------------/ From lwbyppp@epix.net Wed Jan 17 14:23:21 1996 Path: news.epix.net!news.sprintlink.net!crusher.ici.net!tsmith From: tsmith@ici.net (Tim Smith) Newsgroups: rec.radio.amateur.antenna Subject: MFJ SWR Analyzers - Any users? Date: Sun, 14 Jan 96 16:26:54 GMT Organization: From the home front Lines: 15 Message-ID: <4dbe97$gnt@crusher.ici.net> NNTP-Posting-Host: dialups153 X-Newsreader: News Xpress Version 1.0 Beta #4 I'm thinking about buying one...any pros/con? Does your have the internal resistance (aka impedance) bridge? Is the built in counter worth it? Any success/horror stories in antenna building using these? Better than or does it compliment a dip meter? Are the wide range ones (1.8-170MHz)vernier tuned and stable enough for handheld operation? Thanks, N1BTQ Tim Smith Email: tsmith@ici.com WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html Fax: 508-758-9605 From lwbyppp@epix.net Wed Jan 17 14:23:22 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!news1.digex.net!news.crosslink.net!usenet From: chestert@crosslink.net (Chester Alderman) Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: 15 Jan 1996 12:49:10 GMT Organization: CrossLink Internet Services Lines: 34 Message-ID: <4ddig6$e7k@zeus.crosslink.net> NNTP-Posting-Host: dyn015a.springfield.va.us.crosslink.net X-Newsreader: NeoLogic News for OS/2 [version: 4.2] In message <4dbe97$gnt@crusher.ici.net> - tsmith@ici.net (Tim Smith) writes: :> :>I'm thinking about buying one...any pros/con? Does your have the internal :>resistance (aka impedance) bridge? Is the built in counter worth it? Any :>success/horror stories in antenna building using these? Better than or does :>it compliment a dip meter? Are the wide range ones (1.8-170MHz)vernier tune d :>and stable enough for handheld operation? :> :>Thanks, :> :>N1BTQ :> :>Tim Smith :> : Tim...I've been using the older MFJ-247 for several years now and have found it to be a pretty useful piece of gear. This one has the internal 1-40 MHz sig gen and counter, and it can be battery operated. It is very convenient to carry that out to the antennas rather than the older way's of checking SWR. While the engineering lab accuracy certainly is not there, it certainly is close enough for ham use. The only thing I think is better is probably the AEA SWR analyzer with its graphic LCD readout, and of course it is battery operated also. I do think as soon as I can save up the 'nickles' I'm going to get the AEA unit. All-in-all, I've found the MFJ unit to be satisfactory. Tom/W4BQF chestert@crosslink.net From lwbyppp@epix.net Wed Jan 17 14:23:24 1996 Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!netnews From: drted@ix.netcom.com(Ted Viens) Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: 15 Jan 1996 14:04:43 GMT Organization: Netcom Lines: 33 Message-ID: <4ddmtr$g46@cloner3.netcom.com> References: <4dbe97$gnt@crusher.ici.net> NNTP-Posting-Host: ix-hou6-05.ix.netcom.com X-NETCOM-Date: Mon Jan 15 6:04:43 AM PST 1996 In <4dbe97$gnt@crusher.ici.net> tsmith@ici.net (Tim Smith) writes: > >I'm thinking about buying one...any pros/con? Does your have the internal >resistance (aka impedance) bridge? Is the built in counter worth it? Any >success/horror stories in antenna building using these? Better than or does >it compliment a dip meter? Are the wide range ones (1.8-170MHz)vernier tuned >and stable enough for handheld operation? > >Thanks, > >N1BTQ > >Tim Smith > >Email: tsmith@ici.com >WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html >Fax: 508-758-9605 I bought the MFJ-259 last year with the grid dip coils. I am currently using it to check out the results of a home built Lindenblad antenna to be used for weather sat reception. I am happy with it. The frequency counter is an Optronics OP-10 module and can be used separately through a second connector. The meters are adequate for monitoring dips and impedance swings. My only complaint is the poor linearity in the frequency adjust knob. I am sure they could have specified a more appropriate taper or at least added a small resistor or two to modify the taper of the multiturn pots they are using. Still, I am happy with it. -- Bye... Ted.. Deep in the Heart of the Armpits of Houston, Texas... From lwbyppp@epix.net Wed Jan 17 14:23:25 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger From: gcouger@master.ceat.okstate.edu (COUGER GORDON) Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: 15 Jan 1996 14:41:08 GMT Organization: CEAT at Oklahoma State University, Stillwater Lines: 35 Message-ID: <4ddp24$9or@news.cis.okstate.edu> References: <4ddig6$e7k@zeus.crosslink.net> Reply-To: Gordon Couger NNTP-Posting-Host: master.ceat.okstate.edu >In message <4dbe97$gnt@crusher.ici.net> - tsmith@ici.net (Tim Smith) writes: >:> >:>I'm thinking about buying one...any pros/con? Does your have the internal >:>resistance (aka impedance) bridge? Is the built in counter worth it? Any >:>success/horror stories in antenna building using these? Better than or doe s >:>it compliment a dip meter? Are the wide range ones (1.8-170MHz)vernier tun ed >:>and stable enough for handheld operation? >:> >:>Tim Smith > I have an MFJ with frequency readout and internal resistance meter. I find it a very useful tool. It will handle 90% of my needs. It is not as frequency stable as I would like it to be but it is good enough for antenna work. I also use it as a signal generator on occasion. I have a Booton Impeadence bridge and a noise birdge also. I nearly allways use the MFJ because it is eaiser to use and will almost always do what I need. The only real problem with this type of meter is it can be over loaded by a strong recived signal. But this is also true of the Booton. Another problem I have encountered with it is if there is some crud in the connections of an antenna you may need to load it with some power to establish a good enough connection for it to work. This would be true of any other low power method of antenna measurement. I like the unit very much and I would buy another one. Your milage my vary Gordon AB5DG Gordon Couger Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075 gcouger@master.ceat.okstate.edu 405 744 8392 day 625-2855 evenings From lwbyppp@epix.net Wed Jan 17 14:23:26 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!news.tacom.army.mil!ulowell.uml.edu!wang!news.kei.com!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!Shea From: kevin@TerraCom.Net (Kevin Shea) Newsgroups: rec.radio.amateur.antenna Subject: Mods for Yaesu G 5400 az/el rotator Date: Sun, 14 Jan 96 02:42:31 GMT Organization: N9JKP Lines: 20 Message-ID: <4d9qk9$nsk@homer.alpha.net> NNTP-Posting-Host: 205.213.64.118 X-Newsreader: News Xpress Version 1.0 Beta #4 In another newsgroup someone metioned that there was a mod for the 5400. It was suggested to look for info on a tracking system called "supertrack" developed by Freddy de Guchteneire, ON6UG. The mods apparently replace the 10 turn pots with optical encoders in order to improve the pointing accuracy of the 5400. I've looked all over and have found nothing e.g. oak.oakland.edu's FTP site. Any help would be greatly appreciated! 73, Kevin N9JKP **************************************** * Kevin G. Shea N9JKP * * 4460 Dahmen Pass * * Cross Plains, WI 53528 USA * * 608.789.4326,voice; 608.798.1747,fax * **************************************** From lwbyppp@epix.net Wed Jan 17 14:23:27 1996 Path: news.epix.net!news.sprintlink.net!eskimo!news.pixi.com!usenet From: Pat & Adaire Mason Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: MW antennas, capacitors, DFing etc... Date: Sat, 13 Jan 1996 11:45:53 -1000 Organization: Pacific Information eXchange, Inc. Lines: 71 Message-ID: <30F82811.76FC@pixi.com> References: <4d3or0$mtc@antares.en.com> NNTP-Posting-Host: rodan08.pixi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Xref: news.epix.net rec.radio.shortwave:68822 rec.radio.amateur.antenna:18438 Ron Hardin <9289-11216> 0112110 wrote: > > I use a home-made MW loop antenna that is very successful in pulling > signals out of the noise. It extends Imus in the Morning for about an > hour, listening in Ohio to WFAN 660 NYC > > It costs about $10 to build; I'm not sure what the commercial MW loops > are or how much they cost. > > It's not too useful at night, when signal strength isn't lacking, > but is wonderful in the day, for getting an extra couple hundred miles > or so of reception. > > (It's an 18.75 inch side wooden square (18" plus .75 inch thickness of > the next board), with 14 turns of Radio Shack 22awg hookup wire > wound on it, separating the turns as much as possible on the 2.5" > board width. The ends of the wire are connected to the leads > of the capacitor mounted in an unassembled Radio Shack crystal set kit. > The arrangement tunes from 600kHz to 1660kHz. You put the radio > inside the loop, not connecting it to anything, and it works like > a charm. > > The Radio Shack capacitor is noisy and has intermittent connections, > so if you can get a real broadcast capacitor it would be better. > But the crystal set kit is easy to get and regular variable > capacitors are not. > > Most things attach nicely with duct tape. > > I have tried various sizes of loop and find the 18" baby works > as well as bigger ones with my SRIII and 7600G, and is much > handier. > > To raise the whole frequency range, eliminate turns of the wire; > to lower the whole frequency range, add turns. A larger loop > requires fewer turns.) Yes, this design is excellent and uses inductive coupling to the set's internal ferrite rod. Thus I imagine it will not work with those comm. receivers with no internal antenna, such as the Drake R8; yet I use a 12" homemade loop and inductively couple it to an AOR Active ferrite loop antenna and it works well. The flatter you get the loop (narrow turns, larger circumference, like a pancake) the better it will be for direction finding, which is very useful in determining where stations are. This loop is the same design of the Select-a-Tenna, which runs for about $70 or so. The active Kiwa (a future purchase of mine) is $350 + shipping. Kiwa is on the net and has a nice description of the loop and other products, and pictures. Now my question, does anyone know a good place to order broadcast capacitors -- that cover up to 1700 kHz? I don't think there is any good store in Hawai'i that actually has them. I used to get mine from Electronics Plus in Beltsville, MD when I used to live in the Washington "snow haven" area. Also, as far as DFing goes, I have been looking for a great-circle map centered on Honolulu; if anyone has one that they don't need anymore, please let me know at newlife@pixi.com. Also, I found a couple of great circle computation programs on the net which are good use in DF computation -- next post I will give the site when I find out what it is, that is if there is an interest. I forgot the site but will look for it again. Patrick Mason National Radio Club member Mililani, Hawai'i newlife@pixi.com TP DX nightly... From lwbyppp@epix.net Wed Jan 17 14:23:29 1996 Path: news.epix.net!news.sprintlink.net!gryphon.phoenix.net!usenet From: "Bill Holbert Sr." Newsgroups: rec.radio.amateur.antenna Subject: Re: Need help for ( Cushcraft ARX-2B ) Date: 13 Jan 1996 22:55:43 GMT Lines: 15 Message-ID: <4d9d9f$cq3@gryphon.phoenix.net> References: NNTP-Posting-Host: realbill.breh.phoenix.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: tygleung@hkursc.hku.hk Tony my name is Bill and amateur call is W5BBR located in Brenham, TX. If you will tell me the frequency which you wish to operate the ARX-2B I will provide the correct dimensions for setting up the antenna. There will be three dimensions: First will be from the top of the insulator that the Hairpin mounts into, then from the top of insulation from the mount to the mast to the radiator insulator to the bottom of the insulator which the hairpin mounts into, and then finally the dimension of the hairpin to center of the radiator. You can provide answer by E-Mail or place a post here either way. Regards. Bill, W5BBR From lwbyppp@epix.net Wed Jan 17 14:23:30 1996 Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!news.tcst.com!op.net!uaem!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!news.netins.net!news.dacom.co.kr!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need UHF DF ideas Date: 10 Jan 1996 01:45:08 GMT Organization: Hewlett Packard Corvallis Site Lines: 28 Message-ID: <4cv5n4$btc@hpcvsnz.cv.hp.com> References: <4cp9m8$63q@news1.halcyon.com> NNTP-Posting-Host: hplsnb.lsid.hp.com Gordon Mitchell (gordonm@coho.halcyon.com) wrote: : I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and : Adcock array with a doppler scheme for DF. My understanding is that an Adcock antenna uses time-difference-of-arrival at pairs of antennas (with a two orthogonal crossed pairs) to find direction; this is different than a Doppler. : It would be ideal to find one that is hand-held, compact, and doesn't : take much power. Generally it will be used in the 130-900 MHz range. I long ago built the unit described in May, 1978, QST, a Doppler system. I built it originally for 2 meters, but now have an antenna for 440 as well. The deviation varies directly with diameter of the array and with frequency, so for optimal deviation, you are limited to a modest range of frequencies with a single antenna unit, unless you want to optimize your receiver instead. And to get really good antenna switching over a broad range of frequencies will require a lot of care; my antennas are optimized for specific bands. On the plus side, the 440 antenna is small and easily hand-carried. I've put a receiver in the electronics box, with 8 AA penlight cells, and they last several hours of on-time. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Jan 17 14:23:31 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.av.qnet.com!news.qnet.com!news.widomaker.com!grouper.Exis.Net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!warwick!news.herts.ac.uk!news.herts.ac.uk!not-for-mail From: eleqdml@herts.ac.uk (Lauder) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need UHF DF ideas Followup-To: rec.radio.amateur.antenna Date: 12 Jan 1996 16:54:39 -0000 Organization: University of Hertfordshire Lines: 20 Sender: Dave Lauder Message-ID: <4d63of$jnk@altair.herts.ac.uk> References: <4cp9m8$63q@news1.halcyon.com> NNTP-Posting-Host: altair.herts.ac.uk In article <4cp9m8$63q@news1.halcyon.com> gordonm@coho.halcyon.com (Gordon Mitchell) writes: >I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and >Adcock array with a doppler scheme for DF. > >It would be ideal to find one that is hand-held, compact, and doesn't >take much power. Generally it will be used in the 130-900 MHz range. > > Gordon Mitchell K7HCV gordonm@Bug-Killer.com > Future Focus, Inc (206) 489-0446 > Electronic eavesdropping countermeasures For anyone interested in DF, I recommend the book "Transmitter Hunting, Radio Direction Finding Simplified" published by Tab in the USA in 1987. It covers just about every known type of DF technique and gives construction details and practical DF hints. I think you can buy a copy from ARRL. I got mine from Radio Society of Great Britain recently. Dave Lauder, g0sno D.M.Lauder@herts.ac.uk From lwbyppp@epix.net Wed Jan 17 14:23:32 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Noise rejection Date: 9 Jan 1996 05:38:48 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 29 Sender: root@newsbf02.news.aol.com Message-ID: <4ctgjo$nr5@newsbf02.news.aol.com> References: <4cr13l$2o1@zdi.informatik.uni-stuttgart.de> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4cr13l$2o1@zdi.informatik.uni-stuttgart.de>, gelleric@kafka.informatik.uni-stuttgart.de (Wolfgang Gellerich) writes: >Try a magnetic loop. Most of the man made noise constists purely or mainly >of an electric component, while a megnetic loop will only receive the >magnetic component of an electromagnetic field. The ARRL Antenna Book and the >Antenna Book by K. Rothammel give detailled descriptions of this kind of >antenna. > >73s, Wolfgang DJ3TZ Hi Wolfgang, Handbooks present the wrong idea on this. Noise is NOT of a dominate electrical field just "because it comes from electrical appliances and devices". It is just as likely to be magnetic field dominate. If it is far field (or even approaches far field) the magnetic and electrical field levels are equal. For a small antenna both electrical and magnetic fields are nearly equal much closer than a 1/2 wavelength! It doe not matter the noise starts from a spark, a bolt of lightning, or from a CW oscillator. Noise is an electromagnetic wave exactly like a radio wave. "Shielding the loop" can do nothing to help unless the system is very poorly designed or located. 73, Tom From lwbyppp@epix.net Wed Jan 17 14:23:33 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!howland.reston.ans.net!agate!holonet!colossus.holonet.net!cencore!forrest.gehrke From: forrest.gehrke@cencore.com (FORREST GEHRKE) Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-center fed dipol˙˙˙˙˙ Message-ID: <8B8B29F.02CF000512.uuout@cencore.com> Date: Fri, 12 Jan 96 11:11:00 -0300 Distribution: world Organization: Central Core BBS, 201-575-8991 Reply-To: forrest.gehrke@cencore.com (FORREST GEHRKE) References: <4csmst$ad7@cham.nuri.net> X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 30 CM> Hi Forrest, I guess I was fortunate. My Elmer was Shorty, W5OLV (SK) CM> and he was the local Madison Co., TX radio/TV repairman. He loaned CM> out his VTVM and grid dip meter to all the local hams. But, as you CM> say, one can make do with a pickup loop with a neon or other kind of CM> bulb. You definitely were lucky. The VTVM and the grid dip meter really did not become fairly common until the 1950's. That's about the time I bought an RCA Voltohmyst and the Lafayette Grid Dip meter (the latter made in Japan!). CM> >"The most dangerous persons and groups in our society >are those CM> who do not know that they do not know". Upon re-reading my post, that quote could have been read as applying to you, which I did not mean at all. I threw it in only because it is so true so often. As you may know, George Brown went on into television at RCA. He came up with vestigial sideband transmission and was instrumental in devising the present all-electronic color TV broadcast standard which avoided obsoleting B&W receivers when color was being broadcast. His comment was directed at the FCC for approving a kludge CBS color system standard involving a mechanical whirling color filter! (Much like the Jenkins TV scanner wheel of the early 1930's). The industry considered that approval so ridiculous that nobody adopted it or attempted to build TV receivers for it except CBS. It never went anywhere except in FCC demos. I saw one of those receivers--you can imagine the noise from that filter! * RM 1.3 02583 * If it ain't broke yet, let me have a shot at it.... From lwbyppp@epix.net Wed Jan 17 14:23:34 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!ifwtech.demon.co.uk!G3SEK From: Ian White Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Mon, 15 Jan 1996 07:15:05 +0000 Organization: IFW Technical Services Lines: 29 Distribution: world Message-ID: <$kbczLA57f+wEwdz@ifwtech.demon.co.uk> References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4ceesi$fae@hg.oro.net> <4dbqne$dfj@hg.oro.net> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <4dbqne$dfj@hg.oro.net>, Jim Weir wrote: >> Are you saying that a material that passes the oven test >>might still be unsuitable for use at HF? > >Absopositistinkingtruly. Take a plain old aluminum pie pan [snip] OK, I'll give you that one, Jim! :-) Now, an INSULATING >> Are you saying that ^ material that passes the oven test >>might still be unsuitable for use at HF? By "passes the oven test", I mean "gets little or no warmer than the surrounding air, in the time it takes to boil a glass of water". >Tell me if you also didn't get my email on a slightly different >subject. (Sorry, nothing arrived here.) 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Wed Jan 17 14:23:35 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Re: QST Tuner Article Message-ID: <1996Jan12.182122.207@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <9600118213.AA821378459@mails.imed.com> Date: Fri, 12 Jan 1996 18:21:22 GMT Lines: 32 Xref: news.epix.net rec.radio.amateur.homebrew:12665 rec.radio.amateur.antenna:18398 In article faunt@netcom4.netcom.com ( Doug Faunt N6TQS +1-510-655-8604) writes: >Does the copyleft protect the authors from someone else using the code >in a commercial product, or just specify that all changes, as well as >the original source must be made available? The latter. It also prohibits charging for the code, though a media and distribution charge is allowed. Thus someone can't take your program and go sell it, but they can charge a media and distribution fee to *give* it away. Copyleft is a powerful idea, born of concepts of academic freedom. It encourages development by allowing access to the work of others so you don't have to constantly be reinventing the wheel, but can stand on the shoulders of giants while making your contribution. It also, due to the mandatory source availability, is a powerful teaching tool. It allows anyone to see how things work, and how a particular problem might be addressed by a practitioner in the field. This latter is particularly important to an organization like the ARRL which maintains its tax exempt status by claiming to be an educational organization. If they wish to teach us about *auto* tuners, then they'd better show us how the *auto* part works. Trade secrets have no place in a tax exempt educational organization's lead publication. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:23:37 1996 Path: news.epix.net!news.sprintlink.net!online.magnus1.com!wb3ffv!news.cais.net!zippy.cais.net!news From: jsutton@erols.com Newsgroups: rec.radio.amateur.antenna Subject: Re: QST Tuner Article Date: 17 Jan 1996 02:37:52 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 43 Message-ID: <4dhne0$mam@zippy.cais.net> References: <4dg7m9$f2i@news.rrz.uni-koeln.de> NNTP-Posting-Host: ppp194.erols.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) writes: > Dave Nulton wrote: > > > >The focus of my project at this point is writing a program to draw > >a smith chart and plot impeadance points as I run my algorithym. > >The smith chart is a handy way of looking at impeadance data - > >although it has slowed me down quite a bit. I have already > >written the functions needed to model different algorithyms - just > >need to write the algorithyms. > > >I am also looking for a schematic for a "phase / mag" detector - > >to use instead of the directional voltmeter (or > >what-chu-ma-call-it) used in the QST project. That way the > >program could predict the best match instead of clattering relays > >looking for a match. > > Hi Dave ! > As I understand you effort, you want to measure the komplex impedance > of your antenna at a give frequency (i.e. 60-j80), insert the data in > your computer and than it tells you how to adjust your tuner. > If i understood correctly (please tell if i did not), that should be > fairly easy. i wrote a procedure that gives you all solutions of > c1,l,c2 for a t-filter configuration to match a certain impedance to > 50ohms. that is a long list. now you simply take the solution which > has the highest load capacity (c2=max). This should be the best match > with least loss ! > I think the hard part to it is guessing the complex impedance !!! > If you have suggestions, how that could be accomlished, i would be > thankfull to hear. > 73 thilo dl9kce > > *************************** Use one of the antenna modeling programs to get an idea of what your antenna l ooks like and then get a copy of "TL.zip" a program - transmissions line - from ARRL tha t will do exactly what you are talking about. It will give you component data for T - P i and L configurations. 73/Jim/AC4cz > > >>>> From lwbyppp@epix.net Wed Jan 17 14:23:38 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!pravda.aa.msen.com!fu-berlin.de!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: R7 & DX77 Date: 15 Jan 1996 17:32:17 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 14 Message-ID: <4de331$2hqc@info4.rus.uni-stuttgart.de> References: <30F7D00D.3E0@vol.it> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >I'm going to buy a HF vertical antenna and I'd like to know your >opinions or experiences about these antennas: >R7 by Cushcraft and DX77 by Hy Gain. >Tnx a lot. Well, I feel sorry for you. These no-radial verticals are really poor antennas and are easily outperformed by the simplest wire dipole. The advertizment claims of high efficiency are a downright lie. 73, Moritz Dl5UH From lwbyppp@epix.net Wed Jan 17 14:23:39 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Radiation Resistance of end-feed, unbalanced antennas Date: 12 Jan 1996 10:09:50 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 37 Sender: root@newsbf02.news.aol.com Message-ID: <4d5tju$g60@newsbf02.news.aol.com> References: <4d59mk$79p@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi David, In article <4d59mk$79p@newsbf02.news.aol.com>, davidst1@aol.com (DavidSt1) writes: >Tell me if I have this right: >Given an end-fed wire tuned to resonance with a series L/C >tuner, the radiation resistance is a function of the effective >height of the wire above it's ground plane. Radiation resistance is often a carelessly or mis-used term. In the most useful case, it is the total power radiated divided by the square of the net current causing the radiation. If that definition is used, it is a measure of how "easily" the antenna radiates. Your example fits that definition. The other "definition" is feedpoint resistance due to radiation and other losses. It isn't very useful except in very limited applications. >I'm thinking of aircraft HF antennas here. Given the antenna is >tuned to resonance, the wire's effective height above "ground" >(the aircraft body) is small so the radiation resistance is, >at best, a few ohms. So, given that X is tuned out, that leaves >radiation resistance plus ohmonic resistances. Is this correct? Yes, but that isn't necessarily the value measured at the feed terminals. Look at the case of a vertical 1/2 wave end fed. The radiation resistance may be 80-100 ohms at certain heights above a large groundplane, but the feedpoint impedance (as "seen" at the end) can be anywhere from a few hundred to few thousand ohms (depending largely on element thickness). 73 Tom >Thanks, >D. Stinson > > > From lwbyppp@epix.net Wed Jan 17 14:23:40 1996 Path: news.epix.net!news.sprintlink.net!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Radiation Resistance of end-feed, unbalanced antennas Date: 12 Jan 1996 19:59:09 GMT Organization: ELNEC/EZNEC Software Lines: 33 Message-ID: <4d6eid$ote@maureen.teleport.com> References: <4d59mk$79p@newsbf02.news.aol.com> NNTP-Posting-Host: ip-pdx02-49.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > davidst1@aol.com (DavidSt1) writes: > Tell me if I have this right: > Given an end-fed wire tuned to resonance with a series L/C > tuner, the radiation resistance is a function of the effective > height of the wire above it's ground plane. > > I'm thinking of aircraft HF antennas here. Given the antenna is > tuned to resonance, the wire's effective height above "ground" > (the aircraft body) is small so the radiation resistance is, > at best, a few ohms. So, given that X is tuned out, that leaves > radiation resistance plus ohmonic resistances. Is this correct? > Thanks, > D. Stinson The value of the feedpoint resistance depends highly on the lengths of the antenna and aircraft. I recommend forgetting about "ground" and consider the antenna to be made of two "wires" -- one is the actual wire and the other is the aircraft. The antenna is fed at the junction of the two "wires". Any change to either the aircraft or the actual wire will modify the characteristics of the antenna. Think of it as a dipole with unequal length, unequal diameter legs. Some people will argue that "radiation resistance" should be measured at a current loop. If you use that definition, the radiation resistance may be different from the feedpoint resistance, even if the actual wire is shorter than 1/4 wavelength, because a current loop will occur on the aircraft if it's electrically long enough. Roy Lewallen, W7EL From lwbyppp@epix.net Wed Jan 17 14:23:41 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!news2.net99.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!news.bluesky.net!gatech!usenet.eel.ufl.edu!nntp1.jpl.nasa.gov!news.iag.net!news.new-york.net!earth.njcc.com!usenet From: ahusik@pluto.njcc.com (Adam Husik) Newsgroups: rec.radio.amateur.antenna Subject: Repeater Antennas Date: Sun, 14 Jan 1996 01:02:17 GMT Organization: New Jersey Computer Connection, Lawrenceville, NJ Lines: 17 Message-ID: <4d9d67$83d@earth.njcc.com> NNTP-Posting-Host: husik.njcc.com X-Newsreader: Forte Free Agent 1.0.82 We are currently in the planning stage of setting up a VHF repeater with approximately 30-50 watts. The location will be on the top of a house which is approximately at 300'. The house is located on one of the highest points in Princeton NJ, Great Rd. There are trees in the area, however, I'm not sure how relevant that is due to the fact that we are using VHF. My question is: is there a way to calculate the usable range of this repeater system, given that we use a directional or omnidirection antenna. We don't know a lot about antennas but want to get the maximum range possible with the least power. Any suggestions? Adam Husik KB2UTP From lwbyppp@epix.net Wed Jan 17 14:23:42 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.dacom.co.kr!newsrelay.netins.net!solaris.cc.vt.edu!uunet!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: 12 Jan 1996 03:39:12 GMT Organization: Intel Corporation, Chandler, AZ Lines: 40 Distribution: world Message-ID: <4d4l50$vve@chnews.ch.intel.com> References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: vegas.ch.intel.com In article <4d1c51$83k@news.cc.oberlin.edu>, wrote: >I'm thinking of going to a ladder-line-fed dipole instead of my >coax-fed trap dipole to cut my losses in the coax from the >high SWRs of nonresonant antenna. Hi Bill, my 102 ft dipole fed with ladder-line radiates well on all bands because I kill the reflections before they reach my balun and tuner or amp. I just checked into a 75m net in CA from AZ. Net control said he couldn't give me an accurate 'S' meter reading because it only went up to 40dB over S9. I previously lost a lot of my 100w in the tuner and balun. I'm now getting most of my 600w to the antenna. >I think I might get more rf to the radiator using ladder line. There won't be much difference on bands where the SWR is low. There could be considerable difference on bands where the SWR is high. But to be fair, there's not much difference between the losses in 9913 and 300 ohm TV twin-lead. >A fellow ham advised me against using ladder line, saying it >produces a lot of RFI. Is this true? It's a myth that needs to be debunked. Coax with unbalanced currents will radiate much more potential RFI than ladder-line with balanced currents because the equal/opposite currents cancel the fields surrounding the ladder-line. >If so, would a current >balun at the feedpoint eliminate this alleged RFI? Ideally, anytime the transmission system changes from balanced to unbalanced or visa versa, a balun should be installed to help balance the currents. One will generally get more feedline radiation from feeding a balanced antenna directly with coax than from feeding the same antenna directly with ladder-line and a balun at the coax/ladder-line interface. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Wed Jan 17 14:23:44 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!newsfeed.internetmci.com!mr.net!news.mr.net!medtronic.com!usenet From: david.lipson@medtronic.com (David Lipson) Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: 12 Jan 1996 22:03:36 GMT Organization: Medtronic Corporation Lines: 19 Message-ID: <4d6lro$p2a@gazette.medtronic.com> References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: lpc-176.leads.brady.medtronic.com X-Newsreader: WinVN 0.90.5 In article <4d1c51$83k@news.cc.oberlin.edu>, pruth@ocvaxa.cc.oberlin.edu says: > >I'm thinking of going to a ladder-line-fed dipole instead of my >coax-fed trap dipole to cut my losses in the coax from the >high SWRs of nonresonant antenna. While I have no problems using >the trap dipole, being able to tune it EVERYWHERE, including 160m, >I think I might get more rf to the radiator using ladder line. >A fellow ham advised me against using ladder line, saying it >produces a lot of RFI. Is this true? If so, would a current >balun at the feedpoint eliminate this alleged RFI? I'm using a >50' run of RG8U coax to the trap dipole, by the way, which I'm >wondering might be just fine, and that I might be making >unnecessary work for myself, and that the losses now might not >be as bad as I might think. Thanks for your collective wisdom. >--Bill KB8USZ pruth@alpha.cc.oberlin.edu If you have unbalanced currents in either co-ax or ladder, you'll get TVI. de N9PVF From lwbyppp@epix.net Wed Jan 17 14:23:45 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: Sat, 13 Jan 1996 06:57:25 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 64 Message-ID: <4d7l70$t51@news.azstarnet.com> References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: usr5ip19.azstarnet.com X-Newsreader: Forte Free Agent 1.0.82 pruth@ocvaxa.cc.oberlin.edu wrote: >I'm thinking of going to a ladder-line-fed dipole instead of my >coax-fed trap dipole to cut my losses in the coax from the >high SWRs of nonresonant antenna. While I have no problems using >the trap dipole, being able to tune it EVERYWHERE, including 160m, >I think I might get more rf to the radiator using ladder line. >A fellow ham advised me against using ladder line, saying it >produces a lot of RFI. Is this true? If so, would a current >balun at the feedpoint eliminate this alleged RFI? I'm using a >50' run of RG8U coax to the trap dipole, by the way, which I'm >wondering might be just fine, and that I might be making >unnecessary work for myself, and that the losses now might not >be as bad as I might think. Thanks for your collective wisdom. >--Bill KB8USZ pruth@alpha.cc.oberlin.edu Bill, Please don't do this without careful analysis. A properly made trapped dipole is not the terrible lossy monster it is made out to be. Even at the band edge on 160M, the SWR should be moderate enough to be handled in an efficient manner with a antenna tuner in the shack. The extra loss in your coax due to SWR should be negligible. The ladder-line fed dipole (LLFD) on the other hand can be MORE lossy when the true loss of ladder-line is used, particularly in the case cited by WB6LWS. All of this has been discussed here in recent months, but in a nut shell. The published loss figures for are highly optimistic, especially when the line is wet. I have computed losses of from 7 to 12 dB, depending on whether you include the complex line impedance in the calculations, for an 80 meter dipole fed with 100' of 450 ohm line on 160 meters. This assumes dry line, with no accounting for bends, unbalance, etc. A 1/4 wavelength antenna is NOT a good length. Going to 3/8 makes a large difference in efficiency. In addition to line loss, you must add tuner and balun losses which can be much higher than are normally assumed, particularly when the SWR is >100. The idea that RFI is produced by the transmission line, except in cases of poor connections, etc, is nonsense. There MAY be more line radiation from parallel conductor line, but to say this is a cause of RFI is spurious (no pun intended). If another device is being affected by your transmissions, then either your transmitter is generating spurious signals or the affected device is susceptible to overload. Radiation from the line may be increasing the signal at the affected device, but to say the line is "producing" RFI is wrong. You could do the same thing with a "perfect" transmission line and an antenna located closer to the overloading device or by increasing transmitter power. 73, Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:23:46 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!cs.ubc.ca!unixg.ubc.ca!news.bc.net!news.mindlink.net!sol.ctr.columbia.edu!news.oberlin.edu!ocvaxa.cc.oberlin.edu!PRUTH From: pruth@ocvaxa.cc.oberlin.edu Newsgroups: rec.radio.amateur.antenna Subject: RFI from ladderline? Date: 10 Jan 1996 21:47:13 GMT Organization: Oberlin College, Oberlin, Ohio Lines: 13 Message-ID: <4d1c51$83k@news.cc.oberlin.edu> Reply-To: pruth@ocvaxa.cc.oberlin.edu NNTP-Posting-Host: alpha.cc.oberlin.edu I'm thinking of going to a ladder-line-fed dipole instead of my coax-fed trap dipole to cut my losses in the coax from the high SWRs of nonresonant antenna. While I have no problems using the trap dipole, being able to tune it EVERYWHERE, including 160m, I think I might get more rf to the radiator using ladder line. A fellow ham advised me against using ladder line, saying it produces a lot of RFI. Is this true? If so, would a current balun at the feedpoint eliminate this alleged RFI? I'm using a 50' run of RG8U coax to the trap dipole, by the way, which I'm wondering might be just fine, and that I might be making unnecessary work for myself, and that the losses now might not be as bad as I might think. Thanks for your collective wisdom. --Bill KB8USZ pruth@alpha.cc.oberlin.edu From lwbyppp@epix.net Wed Jan 17 14:23:47 1996 Path: news.epix.net!news.sprintlink.net!ns2.pb.net!news From: bob maickel Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: 13 Jan 1996 02:31:41 GMT Organization: Long Island Internet HQ/Point Blank BBS LTD. Lines: 10 Message-ID: <4d75id$cd6@ns2.pb.net> References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: maickel.pb.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) To: pruth@ocvaxa.cc.oberlin.edu X-URL: news:4d1c51$83k@news.cc.oberlin.edu I've used multi-band ladder line antennas for many years. However, the antenna has to be designed to work with ladder line. I don't think it wise to substitute ladder line for coax in your situation. Ladder line does not cause RFI when used with an antenna designed for ladder line. A balun arrangement would probably complicate the problem. AR 73 de Bob WB2ZHA From lwbyppp@epix.net Wed Jan 17 14:23:48 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!swrinde!howland.reston.ans.net!news1.digex.net!news.crosslink.net!usenet From: chestert@crosslink.net (Chester Alderman) Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: 14 Jan 1996 01:05:35 GMT Organization: CrossLink Internet Services Lines: 38 Message-ID: <4d9ksv$e4i@zeus.crosslink.net> References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: dyn016a.springfield.va.us.crosslink.net X-Newsreader: NeoLogic News for OS/2 [version: 4.2] In message <4d4l50$vve@chnews.ch.intel.com> - cmoore@vegas.ch.intel.com (Cecil A. Moore~) writes: :> :>In article <4d1c51$83k@news.cc.oberlin.edu>, :> wrote: :>>I'm thinking of going to a ladder-line-fed dipole instead of my :>>coax-fed trap dipole to cut my losses in the coax from the :>>high SWRs of nonresonant antenna. :> Thanks for asking tha question about trap dipoles and feedline. Some of the responses certainly shows that ham's THINK they know transmission lines. True...if your feedline is only 50 feet long, your probably not going to gain anything by switching to ladder line. Of spaced transmission line, the so-called 'ladder-line' is the worst choice. PVC covered 'ladder-line' has about the same loss per 100' at 21 MHz as coax does. The currents in ladder-line or open wire feeders are ONLY equal and balanced if each side of the dipole are EXACTLY equal in length. ANY equal sided dipole has maximum voltage (minimum current) at the end of each dipole wire. What a wasted (LOSS) to use a balun in a tuner that is connected to open wire feeders. If you go to the trouble to build open wire feeders, also go to the trouble to build/buy a balanced antenna tuner...such as the old E.F. Johnson Match Box type tuners. Don't ever buy the story of someone being 'more than 40 db over' because they use ladder-line or open wire feeders...the next time the propagation skip is substantially different between those two locations, that same station MAY NOT EVEN BE HEARD! Tom...W4BQF chestert@crosslink.net From lwbyppp@epix.net Wed Jan 17 14:23:49 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!iglou!iglou.com!n4lq From: n4lq@iglou.com (Steve Ellington) Subject: Re: RFI from ladderline? X-Nntp-Posting-Host: iglou Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services (1-800-436-4456) X-Newsreader: TIN [version 1.2 PL2] References: <4d1c51$83k@news.cc.oberlin.edu> <4d5fta$ak4@newsbf02.news.aol.com> Date: Fri, 12 Jan 1996 13:00:51 GMT Lines: 14 These guys are talking about feeding a wire antenna without traps. You are feeding a trap dipole which I assume was designed to operate on several bands. Using open wire line would not be advisable since with coax you have a resonable match already. 50feet of anything isn't going to cause much power loss at HF frequencies! Stick with the coax. It will be much easier to match. Plus, if you go to open line, you will need a balun at the tuner which will introduce more loss than you would ever overcome by changing feeders. If you are really concerned about a little loss, switch to a higher grade of coax. -- Steve Ellington N4LQ@IGLOU.COM Louisville, Ky From lwbyppp@epix.net Wed Jan 17 14:23:50 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsrelay.netins.net!solaris.cc.vt.edu!homer.alpha.net!daily-planet.execpc.com!spool.mu.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: SB-201 SWR Date: 12 Jan 1996 11:30:37 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 77 Sender: root@newsbf02.news.aol.com Message-ID: <4d62bd$hu2@newsbf02.news.aol.com> References: <4d5q24$qq1@ns.oar.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Jim, In article <4d5q24$qq1@ns.oar.net>, jaeschke writes: >Another way of looking at the power transfer that I thought >Gary was refering to, is as follows. If I had a 50 ohm load >and a 50v voltage source, I would get the maximum power to the >load with the lowest source impedance, i.e. 0 ohms. The power >would be V^2/50. If I had a source impedance, 50 ohms, the >power to the load is reduced by 75% since the total power is >reduced by one half and the power is shared between the >impedances. That is fine, but remember the PA is a power limited source (as most sources are). As the resistance of the load is lowered, eventually the finite power available will limit current. The voltage will fall, yet no more current will be available. The problem we have occurs because we are conditioned to have a mindset. The mindset tells us current limiting must come from a "resistor" somewhere that dissipates power. That is an incorrect view. Current, voltage, or power limiting can come from a non-dissipating resistance or impedance. Going back to a more basic circuit may help. For example, consider a generator with perfect (or close to perfect) construction. Assume the shaft is driven by an infinite source of power (or a souce much larger than the load power requires). If field winding current and the internal magnetic field is limited, the power available from generator will also be limited. As generator loading is increased at some point maximum power extraction occurs. Lighter loading will cause the voltage to rise less rapidly than the current decrease, and heavier loading will cause the voltage to drop faster than the load current increases. The generator behaves as if limited by an internal resistance, yet there is no internal heat produced! It is a impedance limited source! That is why generators can be very efficient even when maximum power is being drawn. Maximum efficiency occurs very near the point of maximum power transfer to the load in a well designed generator system. >The maximum power transfer theorem applies to finding a load >that matches the source impedance. Since we have fixed in our >minds that the load is always 50 ohms, we tend to think using >the theorem that the source impedance should be 50 ohms for >maximum power transfer. This is not true. Of course it is. Otherwise the theorem is incorrect. The problem is as I tried to illustrate above. We are conditioned to have a mindset that anything that limits power must dissipate power. That isn't true. Let me give another example using the generator. Consider what would happen if the field winding has unlimited flux, and the shaft is driven by a water wheel. If output loading were increased, the wheel would simply slow down. No heat would be produced. At a certain value of load impedance, maximum power is transferred. The efficiency of the generator can be 99% at this point. Yet it is the point of conjugate match. Let's say this point was 50 volts at one ampere. If we inserted a source in series with the load and wiggled the voltage across the load, we would see the current CHANGE required to wiggle the voltage across the load 1 volt would be .02 amperes. Looking back at the generator, it would look like it was trying to wiggle 50 ohms in the source, even though it's an impedance rather than an actual resistor. >My confusion comes from the effect of SWR when the source >impedance is not 50 ohms. I had assumed that it would have >the same effect at either end. But I am not sure that it would >change the power transfer on a transmission line if the source >is not matched to the line. All we can be sure of is maximum power is transferred to the load. January QST Exploring RF seems to illustrate ( and perhaps re-enforce) this misconception very well. The attenuation of an attenuator is exactly as designed when the load and attenuator have the same design impedance. The source impedance does n From lwbyppp@epix.net Wed Jan 17 14:23:51 1996 Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!news.cyberstore.ca!van-bc!news.mindlink.net!uniserve!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.magi.com!newsadm From: Kilgore Trout Newsgroups: rec.radio.amateur.antenna Subject: Shogun TV Antenna? Date: 15 Jan 1996 19:22:41 GMT Organization: RAMJAC Corporation Lines: 12 Message-ID: <4de9i1$nbs@news.magi.com> NNTP-Posting-Host: magi04p46.magi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Does anyone have any experience with this type of TV antenna? It looks like a tube/rod instead of the typical TV antenna. I was thinking of replacing the on e on my cottage which got hit by a falling tree. Recommendations on TV antennas? Also, does anyone have any recommendations on improving reception? Do any of t he electronic gizmos help or is this strictly related to having a good antenna an d location? Thanks in advance from the Great White North... KT From lwbyppp@epix.net Wed Jan 17 14:23:52 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news-feed.mci.newscorp.com!uunet!in2.uu.net!csn!nntp-xfer-2.csn.net!yuma!usenet From: fiz Newsgroups: rec.radio.amateur.antenna Subject: Source of Al tubing? Date: Tue, 16 Jan 1996 16:39:53 -0700 Organization: Colorado State University, Fort Collins, CO 80523 Lines: 6 Message-ID: <30FC3749.ED3@lamar.colostate.edu> NNTP-Posting-Host: slip228x.slip.colostate.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Hi, I'm looking for a source of Al tubing to build some antennas. Any suggestions? ttfn fiz (KG0YG) From lwbyppp@epix.net Wed Jan 17 14:23:53 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!bdt.com!rmstar.efi.com!nntp-hub.barrnet.net!inet-nntp-gw-1.us.oracle.com!news.internetMCI.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 12 Jan 1996 20:16:16 GMT Organization: ELNEC/EZNEC Software Lines: 30 Message-ID: <4d6fig$ote@maureen.teleport.com> References: <4d3cdj$qh5@chnews.ch.intel.com> NNTP-Posting-Host: ip-pdx02-49.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > cmoore@scorpion.ch.intel.com (Cecil A. Moore~) writes: > In article <4d084u$oun@newsbf02.news.aol.com>, > W8JI Tom wrote: > > >... Or do you fear the response would be another > >example of "we told you how it is, and so it must be"? > > Hi Tom, I have written numerous letters to Sterba and gotten > absolutely no response. Worldradio responds nicely to letters > addressed to the magazine but probably passes letters addressed > to Sterba directly on to Him. . . A letter I wrote a while back was sent both to the editor and to "Sterba". He responded to the letter in his column without printing the letter or naming its writer. Another bit of evidence that he reads them -- In my letter I got on his case about using "S-Units" as a measurement unit (one of my hot buttons) and suggested that if he insists on using a 6-dB unit of measurement, he ought to call it a "Sterby", not an "S-Unit". (This is because the units on receivers' S-meters are seldom 6 dB and may be GREATLY different from 6.) Anyway, a couple of columns ago, there it is. At least he's capable of learning, just not capable of giving credit or acknowledging errors. But he does help sell magazines, just like Uncle Wayne. Roy Lewallen, W7EL From lwbyppp@epix.net Wed Jan 17 14:23:54 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.jersey.net!homer.alpha.net!daily-planet.execpc.com!news.moneng.mei.com!bloom-beacon.mit.edu!news.kei.com!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Sat, 13 Jan 96 01:42:03 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 15 Message-ID: References: <4cuduv$11g5@chnews.ch.intel.com> <0099C332.160AE597@netins.net> NNTP-Posting-Host: bos1d.delphi.com X-To: writes: >I have trouble believing that a guy who writes about tuning up garbage cans, >grocery carts and beer can verticals and who rounds all his d.b. figures to t he >nearest whole number REALLY believes he operates a "perfect circle" >antenna, except to mention it "tongue-in-cheek". This is his writing style: t hat >of a self-deprecating ironic sarcasm. >No offense intended (I mean that!) but you gotta get out of the laboratory >and into an English lit course. No offense taken. I'm just disappointed that you didn't recognize my tongue-in-cheek, self-deprecating ironic sarcasm. ;-) 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Wed Jan 17 14:23:55 1996 Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.kth.se!news.eunet.fi!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore From: cmoore@scorpion.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 11 Jan 1996 16:04:03 GMT Organization: Intel Corporation, Chandler, AZ Lines: 22 Distribution: world Message-ID: <4d3cdj$qh5@chnews.ch.intel.com> References: <4cuduv$11g5@chnews.ch.intel.com> <4d084u$oun@newsbf02.news.aol.com> NNTP-Posting-Host: scorpion.ch.intel.com In article <4d084u$oun@newsbf02.news.aol.com>, W8JI Tom wrote: >... Or do you fear the response would be another >example of "we told you how it is, and so it must be"? Hi Tom, I have written numerous letters to Sterba and gotten absolutely no response. Worldradio responds nicely to letters addressed to the magazine but probably passes letters addressed to Sterba directly on to Him. In a newsgroup posting with another netter, I used the words "as if". Sterba devoted 1/3 of His column the next month to blasting me for the use of those words as being non-scientific. He was trying to hold me to a high standard and that's OK. I just want Him not to be a hypocrite and to hold Himself to the standards that He asks from me and others. Sterba says He has an antenna that is a "perfect circle". Seems that is a more ridiculous statement than my use of "as if". 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Wed Jan 17 14:23:56 1996 Path: news.epix.net!news.sprintlink.net!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!news.bluesky.net!gatech!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!ender.techcenter.paccar.com!news From: kg7hq@paccar.com (Michael A. Sterba) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 11 Jan 1996 08:20:48 GMT Organization: OES Skagit County WA. Lines: 19 Distribution: world Message-ID: <4d2h90$7fm@ender.techcenter.paccar.com> References: <4cuduv$11g5@chnews.ch.intel.com> <0099C332.160AE597@netins.net> NNTP-Posting-Host: kg7hq.paccar.com Mime-Version: 1.0 X-Newsreader: WinVN 0.99.4 Hello Cecil and Group, In article <0099C332.160AE597@netins.net>, crcarlson@netins.net says... (Cecil A. Moore~) writes: >I have trouble believing that a guy who writes about tuning up garbage cans, >grocery carts and beer can verticals and who rounds all his d.b. figures to t he >nearest whole number REALLY believes he operates a "perfect circle" >antenna, except to mention it "tongue-in-cheek". This is his writing style: t hat >of a self-deprecating ironic sarcasm. >No offense intended (I mean that!) but you gotta get out of the laboratory >and into an English lit course. I think your right here. :) Real world antenna problems are bit harder to deal with and a laboratory simulation. At least this is what this real "Sterba" has found. -- "Handcrafted From The Finest ASCII" 73's de KG7HQ From lwbyppp@epix.net Wed Jan 17 14:23:57 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.interlog.com!news.dra.com!news.starnet.net!wupost!udel!gatech!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 14 Jan 1996 05:59:07 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 37 Sender: root@newsbf02.news.aol.com Message-ID: <4danlr$kia@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Will, I wrote: >> The only problem with Sterba is he makes mistakes, and doesn't allow >> anyone to correct them. That makes his column a poor forum for education, >> because it everything in it is just his opinion. >> It should be read for entertainment, but not for knowlege enhancement. You wrote: > >Tom, I wonder of you can provide any facts to back up your claim? Cecil just mentioned a few recent problems. My experience was years ago when I wrote to him about some grave technical errors concerning radiation resistance, ground systems, and verticals. I even included references. His response was to make a few wise comments and out of context half truths about what "some W8" said and go on with the same incorrect information. Unfortunately that was too long ago to recall the specific language he used. >fan of Sterba's it never occurred to me to consider him inerrant, but as >a lifetime subscriber to WORLDRADIO, I have yet to see him fail to admit >a mistake. Maybe I have missed something. Probably you have missed something, hi. How would you know when he made a mistake, if he edits all the responses and extracts little areas that he dances around? Look at it this way......You read his column and trust him to provide the correct data. If he never prints or responds to letters that point out errors, how would you know he ever even made an error? Anyway, I'm sure it's 90% acting just to generate attenation. I just hope anyone trying to get a fair view or to seriously learn how something works keeps that in mind. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:23:59 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.itd.umich.edu!newsxfer2.itd.umich.edu!gatech!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!news.ogitel.net!seikotsi.com!usenet From: jkaplan@seikotsi.com (KG7FU) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Mon, 15 Jan 1996 17:16:38 GMT Organization: Seiko Communications Systems Inc., Beaverton, Oregon, USA. Lines: 53 Message-ID: <4de25m$pgc@news1.seikotsi.com> References: <4cuduv$11g5@chnews.ch.intel.com> NNTP-Posting-Host: 198.3.253.45 X-Newsreader: Forte Free Agent 1.0.82 cmoore@scorpion.ch.intel.com (Cecil A. Moore~) wrote: >In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna >manufacturers for making outrageous claims and then turns >around and makes an outrageous claim for his own antenna. There's not a difference between manufacturing a product for sale, misleading the consumer about it's specifications and making an honest mistake about your hombrew job? >"I fully know that the triangle will be some ... fraction of >a dB down from a square. I myself run mine in the form of a >perfect circle." Try taking it in context. I'm sure he meant a circle as opposed to something less than square or triangular. >Wow, "a perfect circle". An antenna whose height above ground >does not vary by even an infinitesimal amount and whose diameter >does not vary by even an infinitesimal amount. Sterba must be >the only person in the universe with "a perfect circle" antenna. >Of course, he also has perfectly flat ground under his antenna >or else it wouldn't be "a perfect circle". And of course, he >also has perfect wire or else it wouldn't be "a perfect circle". >Dang, the man and everything around him must be perfect. You're putting way too many words into his discription and have missed the point entirely. BTW: what does "perfectly flat ground" have to do with the ability to construct a "perfect" cricle above it? I've installed plenty of horizontal antenna structures with out the benefit of level terrain. >Kurt, I'll bet you $100 that your antenna is not a perfect >circle and that your claim is exaggerated exactly like the >claims of the antenna manufacturers you love to criticize. I'll bet you his "perfect circle" is closer to truth than some advertisements in 73 Magazine vis-a-vis gain specifications. >73, Cecil, KG7BK, OOTC (not speaking for my employer) Being in the broadcast industry I have to question why some amateur product manufacturers make wild claims about their product. If a broadcast antenna manufacturer advertised in a similar fashion there'd be reports with technical back-up in all the trade journals slamming the faux-pas. I'm surprised, actually, that Mr. Sterba doesn't actually let us know the names of these outfits. Ever wonder why QST ads NEVER have gain specs? Why is it o.k. for and amateur oriented manufacturer to do this? I'd rather suffer the consequences without their product than be made to feel stupid. KG7FU From lwbyppp@epix.net Wed Jan 17 14:24:00 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip49.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Mon, 15 Jan 1996 21:32:28 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 50 Message-ID: References: <4cuduv$11g5@chnews.ch.intel.com> <4de25m$pgc@news1.seikotsi.com> NNTP-Posting-Host: usr6ip49.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4de25m$pgc@news1.seikotsi.com> jkaplan@seikotsi.com (KG7FU) writes : >From: jkaplan@seikotsi.com (KG7FU) >Subject: Re: Sterba again >Date: Mon, 15 Jan 1996 17:16:38 GMT >cmoore@scorpion.ch.intel.com (Cecil A. Moore~) wrote: >>In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna >>manufacturers for making outrageous claims and then turns >>around and makes an outrageous claim for his own antenna. >There's not a difference between manufacturing a product for sale, >misleading the consumer about it's specifications and making an honest >mistake about your hombrew job? I don't subscribe to this rag, but I did get a promo copy. I used it to line the bird cage, so I can't refer to it, however, I seem to remember part of the editorial discussing an appeal to the "common non-techie (wo)man." If indeed, the purpose is to educate the beginner, then it is a grave disservice to mislead the newcomer with some of the hair-brained ideas (including this one) offered in this publication. I have made similar complaints to ARRL regarding some of the same kinds of errors published in the New Ham Companion section of QST. In this endeavor, I have been in the company people of the caliber of John Belrose, et al. Neither of these publications seems to be willing to acknowledge any of this in print. In my opinion, the very last place errors should occur is in writings directed to beginners. Those of us in this forum are (mostly) better able to evaluate these things and can have (usually) reasoned discussions about them and separate the wheat from the chaff. >Being in the broadcast industry I have to question why some amateur >product manufacturers make wild claims about their product. If a >broadcast antenna manufacturer advertised in a similar fashion there'd >be reports with technical back-up in all the trade journals slamming >the faux-pas. I'm surprised, actually, that Mr. Sterba doesn't >actually let us know the names of these outfits. Ever wonder why QST >ads NEVER have gain specs? Why is it o.k. for and amateur oriented >manufacturer to do this? I'd rather suffer the consequences without >their product than be made to feel stupid. I know why ARRL claims to not publish manufacturer's antenna gain numbers. Sure they are inflated like auto horsepower ratings, but then take a look at the rest of the ads in QST and see all of the other unproven or misleading superlatives which are unchallenged. That's show biz. >KG7FU Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:24:01 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Tue, 16 Jan 96 22:16:09 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 10 Message-ID: References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> <4dhglb$qrv@news.asu.edu> NNTP-Posting-Host: bos1g.delphi.com X-To: writes: > doubling the power raises three dB. Well, one must raise the > voltage by six times to gain three dB." > Wonder what kind of calculator Sterba uses. Mine says if v2/v1=6 then that's almost 16 dB. 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Wed Jan 17 14:24:02 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.mind.net!news.onramp.net!newshost.convex.com!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!atkes From: atkes@imap1.asu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 17 Jan 1996 00:42:19 GMT Organization: Arizona State University Lines: 13 Message-ID: <4dhglb$qrv@news.asu.edu> References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> NNTP-Posting-Host: general2.asu.edu X-Newsreader: TIN [version 1.2 PL2] armond@delphi.com wrote: : Cecil Moore writes: : : it exactly...... and Cecil, you must be the only one in the world that didn' t : catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get : a copy of MAD magazine....pay someone to explain the gags to you. Kurt had an even better joke in the January 96 Aerials column: "Now we'll get to learning. First, just about all know that doubling the power raises three dB. Well, one must raise the voltage by six times to gain three dB." From lwbyppp@epix.net Wed Jan 17 14:24:03 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!howland.reston.ans.net!news1.digex.net!news.crosslink.net!en.com!usenet From: "Steven M. Evans" Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: SW/MW Antennas evaluations Date: 11 Jan 1996 19:35:58 GMT Organization: Exchange Network Services Lines: 27 Message-ID: <4d3or0$mtc@antares.en.com> NNTP-Posting-Host: l2-1.en.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.shortwave Xref: news.epix.net rec.radio.shortwave:68762 rec.radio.amateur.antenna:18401 At the Grove web site I found the following antennas listed and am wondering if anyone has used these and found them to be useful, or have you seen reviews written about them. Grove Skywire Antenna Outdoor dipole provides worldwide sw reception! Stoner-Dymek Active Antenna The best 50 kHz-30 MHz active, receiving antenna available! Grove Mini-Skywire Short on Yard Space? Select-A-Tenna Medium Wave Loop Antenna Booster Ideal for Apartment Dwellers! Realistic Amplified Shortwave Antenna Active Antenna and A Preselector All-In-One! KIWA MW Air-Core Loop Antenna High Performance! Universal Reel Antenna for Shortwave Portables! Ideal For Apartment Dwellers! Thanks for your help! From lwbyppp@epix.net Wed Jan 17 14:24:04 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: radiomatt@aol.com (Radiomatt) Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: Re: SW/MW Antennas evaluations Date: 13 Jan 1996 07:41:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4d89a0$ift@newsbf02.news.aol.com> References: <4d3or0$mtc@antares.en.com> Reply-To: radiomatt@aol.com (Radiomatt) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: news.epix.net rec.radio.shortwave:68811 rec.radio.amateur.antenna:18432 The KIWA is superb, but only for AM broadcast (540 kHz to 1705 kHz). A longwire, whether by Grove or anybody else is cheapest/best if you can get it up at least 25 feet, and over 35 feet long. Forget the R/S active antenna unless you need one for traveling with a SW radio and want to use it in hotel rooms, etc. I use longwires (plus a KIWA for AM/BC), but for SW I have 3 McKay Dymek DA-100s. I feed them to different receivers and they are as sensitive as the 40-50 foot longwires I have, but a lot smaller and less visibly obtrusive (to my wife). They reach from longwave to 30 MHz andare the best all-around unit you can get. From lwbyppp@epix.net Wed Jan 17 14:24:06 1996 Path: news.epix.net!news.sprintlink.net!usit.net!news From: sfritts@usit.net (Steven Fritts) Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: Re: SW/MW Antennas evaluations Date: Sat, 13 Jan 1996 17:22:38 GMT Organization: United States Internet, Inc. Lines: 34 Message-ID: <4d8pu6$t6n@news.usit.net> References: <4d3or0$mtc@antares.en.com> Reply-To: sfritts@usit.net NNTP-Posting-Host: bway-slip110.dynamic.usit.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.shortwave:68815 rec.radio.amateur.antenna:18435 "Steven M. Evans" wrote: >At the Grove web site I found the following antennas listed and am >wondering if anyone has used these and found them to be useful, or have >you seen reviews written about them. >Grove Skywire Antenna Outdoor dipole provides worldwide sw > reception! >Stoner-Dymek Active Antenna The best 50 kHz-30 MHz active, > receiving antenna available! >Grove Mini-Skywire Short on Yard Space? >Select-A-Tenna Medium Wave Loop Antenna Booster > Ideal for Apartment Dwellers! >Realistic Amplified Shortwave Antenna > Active Antenna and A Preselector > All-In-One! >KIWA MW Air-Core Loop Antenna High Performance! >Universal Reel Antenna for Shortwave Portables! > Ideal For Apartment Dwellers! >Thanks for your help! While it was not listed, I am using among others, the Sony ANT-1 with excellent results. Great little antenna! Steve From lwbyppp@epix.net Wed Jan 17 14:24:07 1996 Path: news.epix.net!usenet From: 71674.16@compuserve.com (Scott Walker) Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna Subject: Re: SW/MW Antennas evaluations Date: 17 Jan 1996 16:23:17 GMT Organization: epix.net Lines: 22 Message-ID: <4dj7pl$fbg@guava.epix.net> References: <4d3or0$mtc@antares.en.com> NNTP-Posting-Host: lwbyppp182.epix.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net rec.radio.shortwave:68959 rec.radio.amateur.antenna:18516 In article <4d3or0$mtc@antares.en.com>, sevans@en.com says... > >At the Grove web site I found the following antennas listed and am >wondering if anyone has used these and found them to be useful, I have a Kiwa for MW. Its great, giving excellent sensitivity PLUS the ability to null-out interfering adjacent signals and/or local noise. I have a McKay-Dymek DA100D active antenna (older version of the one at Grove?) that I use for SW. Its sensitive enough for those of us with no room for longwires, but it is susceptible to locally generated noise, which I have a lot of. Ideally I would have both it AND a longwire, and switch between them based upon my target... -- ************************************************ * Scott Walker * * 71674.16@compuserve.com * * *** * * "Age Quod Agis." - Jerry Brown, 1992 * ************************************************ From lwbyppp@epix.net Wed Jan 17 14:24:08 1996 Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.kth.se!news.eunet.fi!EU.net!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!news.trw.com!news2.trw.com!alpha.nafb.trw.com!sysadmin From: robert.wartburg@trw.com (Bob Wartburg) Newsgroups: rec.radio.amateur.antenna Subject: Tower Specs Date: 11 Jan 1996 19:25:57 GMT Organization: TRW Lines: 8 Message-ID: <4d3o85$jpc@alpha.nafb.trw.com> NNTP-Posting-Host: sp232 Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 Tower specifications state the tower will withstand a 50 MPH wind for a given antenna wind area. If an antenna has 1/2 of this given wind area, can the tower take 100 MPH winds? Thanks Bob K0LLO From lwbyppp@epix.net Wed Jan 17 14:24:08 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!in-news.erinet.com!imci3!imci2!newsfeed.internetmci.com!news.ro.com!usenet From: Jim Kinney Newsgroups: rec.radio.amateur.antenna Subject: Re: Tower Specs Date: Mon, 15 Jan 1996 03:23:18 +0000 Organization: RENAISSANCE INTERNET SERVICES Lines: 18 Message-ID: <30F9C8A6.5B26@ro.com> References: <4d3o85$jpc@alpha.nafb.trw.com> NNTP-Posting-Host: ts4p7.ro.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Bob Wartburg wrote: > > Tower specifications state the tower will withstand a 50 MPH wind for a > given antenna wind area. If an antenna has 1/2 of this given wind area, > can the tower take 100 MPH winds? > > Thanks > > Bob K0LLO If you consider the antenna only the tower could support 1/4 the antenna at twice the wind velocity. The force equation is P=.004V*2. If you consider the tower and the antenna together, the tower may not support itself at 100 mph let alone the tower and an antenna. Hope this helps. 73's Jim WB7ECS From lwbyppp@epix.net Wed Jan 17 14:24:10 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.netzone.com!news.rtd.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!sdd.hp.com!col.hp.com!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger From: gcouger@master.ceat.okstate.edu (COUGER GORDON) Newsgroups: rec.radio.amateur.antenna Subject: Re: Tower Specs Date: 12 Jan 1996 01:53:38 GMT Organization: CEAT at Oklahoma State University, Stillwater Lines: 15 Message-ID: <4d4ev2$4do@news.cis.okstate.edu> References: <4d3o85$jpc@alpha.nafb.trw.com> Reply-To: Gordon Couger NNTP-Posting-Host: master.ceat.okstate.edu In article <4d3o85$jpc@alpha.nafb.trw.com>, Bob Wartburg wrote: >Tower specifications state the tower will withstand a 50 MPH wind for a >given antenna wind area. If an antenna has 1/2 of this given wind area, >can the tower take 100 MPH winds? > The drag (wind load of the antenna) is proportional to the velocity squared. So wind load on an anttena with half the wind load area will produce a good deal more than twice the wind load if the wind speed is doubled. Gordon AB5DG Gordon Couger Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075 gcouger@master.ceat.okstate.edu 405 744 8392 day 625-2855 evenings From lwbyppp@epix.net Wed Jan 17 14:24:10 1996 Path: news.epix.net!news.sprintlink.net!news.socketis.net!op014 From: jmleveron@socketis.net (jmleveron) Newsgroups: rec.radio.amateur.antenna Subject: Transportable Antenna? Date: Mon, 15 Jan 96 02:12:36 GMT Organization: SOCKET Internet Services Lines: 8 Message-ID: <4dcicr$gm1@news.socketis.net> NNTP-Posting-Host: 205.242.94.64 X-Newsreader: News Xpress Version 1.0 Beta #4 I would like to get some opinions on a good, back-packable (or readily vehicle transportable) omnidirectional and/or dir. antenna for 2m. I'm looking for something with high gain. J-pole, di Zepp, dipole, 5/8; whatever works is great! FM phone is only mode needed. Will be powering this from a 5 watt handheld. Thanks for your replies! 73 de John From lwbyppp@epix.net Wed Jan 17 14:24:11 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet Newsgroups: rec.radio.amateur.antenna Subject: Re: Transportable Antenna? Message-ID: From: Bill Harwood Date: Tue, 16 Jan 1996 20:17:26 GMT Sender: usenet@avalon.chinalake.navy.mil (NAWS news admin) References: <4dcicr$gm1@news.socketis.net> Organization: NAWS, China Lake, CA Content-Type: text/plain; charset=us-ascii To: jmleveron@socketis.net Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:4dcicr$gm1@news.socketis.net Lines: 15 Try the Antennas West roll up J-pole or if you are a builder build one. Use ladder line and make a j-pole antenna. Some COAX to a BNC on the bottom and a place to hook a fishing line on the top. The fishing line goes over something high and you hois up the ladder line and hook to your HT. Good Luck \------------------------------------------------------/ \ Bill Harwood U play it, I'll dance it / \ AB6DY or / \ I'll play it, U dance it / \----------------------------------------------/ From lwbyppp@epix.net Wed Jan 17 14:24:13 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!news.fibr.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail From: mchasse@primenet.com Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF Log Periodic Date: 13 Jan 1996 06:31:01 -0700 Organization: Primenet Services for the Internet Lines: 12 Sender: root@primenet.com Message-ID: <4d8c6l$bmr@nnrp1.news.primenet.com> References: <4c3it8$2gis@lamar.ColoState.EDU> <4d69k7$n36$2@mhafn.production.compuserve.com> Reply-To: mchasse@primenet.com X-Posted-By: ip157.fhu.primenet.com X-Newsreader: IBM NewsReader/2 v1.03 In <4d69k7$n36$2@mhafn.production.compuserve.com>, Roger A. Cox <75052.3037@Co mpuServe.COM> writes: >I have written a DOS program that can be used to design or >analyze LPDA antennas. Look for LPCAD.EXE or LPCAD.ZIP on >CompuServe's HAMNET Library or at ftp.nic.funet.fi in the Ham >antenna area. LPCAD ver. 2 has a few more graphics than ver. >1.37 but is essentially the same. > >73, Roger WB0DGF Does the program work for HF Log Periodics also 73, Mike From lwbyppp@epix.net Wed Jan 17 14:24:14 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!uunet!in2.uu.net!news.spss.com!uchinews!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Roger A. Cox <75052.3037@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF Log Periodic Date: 12 Jan 1996 18:34:47 GMT Organization: Telex Communications, Inc. Lines: 7 Message-ID: <4d69k7$n36$2@mhafn.production.compuserve.com> References: <4c3it8$2gis@lamar.ColoState.EDU> I have written a DOS program that can be used to design or analyze LPDA antennas. Look for LPCAD.EXE or LPCAD.ZIP on CompuServe's HAMNET Library or at ftp.nic.funet.fi in the Ham antenna area. LPCAD ver. 2 has a few more graphics than ver. 1.37 but is essentially the same. 73, Roger WB0DGF From lwbyppp@epix.net Wed Jan 17 14:24:14 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!grumpy.insinc.net!news.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!nctuccca.edu.tw!news.cc.nctu.edu.tw!ccnews.ncku.edu.tw!sparc12!n2683244 From: n2683244@sparc12.cc.ncku.edu.tw () Newsgroups: rec.radio.amateur.antenna Subject: Wanted: Smith Chart on PC Date: 12 Jan 1996 13:14:30 GMT Organization: Computer Center, NCKU, Tainan, Taiwan, R.O.C. Lines: 19 Message-ID: <4d5mrm$4iv@ccnews.ncku.edu.tw> NNTP-Posting-Host: sparc12.cc.ncku.edu.tw X-Newsreader: TIN [version 1.2 PL2] ubject: Wanted: Smith Chart on PC Newsgroups: sci.electronics.design Summary: Keywords: Hi there : I am in urgent need of a PC software which can help me to draw Smith Chart on PC and even process the Chart on PC .... I wonder if there is any free-shared software to help. If you know please let me know.... Thank in advance ! Clifford From lwbyppp@epix.net Wed Jan 17 14:24:15 1996 Path: news.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!crl.dec.com!caen!sol.ctr.columbia.edu!news.mindlink.net!van-bc!uniserve!news.uniserve.com!usenet From: Jeff Newsgroups: rec.radio.amateur.antenna Subject: Re: What kind of HF antena using space of apartment's balconi? Date: 11 Jan 1996 00:37:43 GMT Organization: UNIServe Lines: 14 Message-ID: <4d1m4n$bu5@enigma.uniserve.com> NNTP-Posting-Host: van0111.tvs.net ykoc2@ocmp.sk.co.kr (Gun Kim) writes: > Hellow! > I'm biginner of amateur radio,in South Korea. > I have 2m and HF all band Rig. > But I am in a difficulty to construct antena system. > I need information for using apartment's balconi. > > thanks, > DE DS1AFL 73~~ > try using a Antron 99 laying horizontal. Spoke with ham in the east that had been using one for several years and has had nothing but success. With good swr from 14 mhz through 30 mhz. Good Luck From lwbyppp@epix.net Wed Jan 17 14:24:16 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.ro.com!usenet From: "John D. Farr" Newsgroups: rec.radio.amateur.antenna Subject: Re: Wind Load Date: Sun, 14 Jan 1996 01:44:16 -0600 Organization: RENAISSANCE INTERNET SERVICES Lines: 21 Message-ID: <30F8B450.DE9@ro.com> References: <4da9jg$fgk@newsbf02.news.aol.com> NNTP-Posting-Host: ts1p1.ro.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4 (Win95; I) To: W2FOE W2FOE wrote: > > I'm trying to design an antenna support. How does one convert wind > velocity to force in pounds per square foot? > > Thanks, Merv try: p = 0.004 v^2 where p is peak pressure (lb/ft^2) and v is the mean wind speed (mi/h). this is from "Physical Design of Yagi Antennas" by David B. Leeson, W6QHS. It is sold by the ARRL and is an excellent reference for any antenna design. 73 John KC4ZXX From lwbyppp@epix.net Wed Jan 17 14:24:17 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w2foe@aol.com (W2FOE) Newsgroups: rec.radio.amateur.antenna Subject: Wind Load Date: 14 Jan 1996 01:58:56 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 4 Sender: root@newsbf02.news.aol.com Message-ID: <4da9jg$fgk@newsbf02.news.aol.com> X-Newsreader: AOL Offline Reader I'm trying to design an antenna support. How does one convert wind velocity to force in pounds per square foot? Thanks, Merv From lwbyppp@epix.net Wed Jan 17 14:24:18 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!ind-000-236-49 From: mai@iquest.net (Patrick Croft) Subject: WTB: ROHN 45/55 TOWERS!!! X-Nntp-Posting-Host: ind-000-236-49.iquest.net Message-ID: Keywords: TOWERS Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 Date: Sat, 13 Jan 1996 16:47:36 GMT Lines: 12 I'm hunting sections of Rohn 45 and/or 55 towers, and the various hardware acc essories that go with them. Additionally, I'm interested in buying a RTS (Dick Weber) rotating tower sy stem or parts for Rohn 25,45,55. PLEASE EMAIL ME WHAT YOU HAVE - EVEN A SINGLE SECTION OF TOWER CONSIDERED ! With all the swap nets, corners of garages holding 'spares', and plans that ge t changed, keep this WTB in mind when you hear someone looking to sell! Somebody's got to have some somewhere! Thanks! WB9IQI - Patrick Croft Daytime Tel:(317)257-6811 Fax:(317)257-1590 email:mai@iquest.net From lwbyppp@epix.net Wed Jan 17 14:24:19 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!usenet.seri.re.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WTB: ROHN 45/55 TOWERS!!! Date: 14 Jan 1996 21:17:06 GMT Organization: Texas A&M University, College Station, TX Lines: 29 Message-ID: <4dbrsi$sos@news.tamu.edu> References: Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In , mai@iquest.net (Patrick Croft) writes: >I'm hunting sections of Rohn 45 and/or 55 towers, and the various hardware ac cessories that go with them. > Additionally, I'm interested in buying a RTS (Dick Weber) rotating tower s ystem or parts for Rohn 25,45,55. > PLEASE EMAIL ME WHAT YOU HAVE - EVEN A SINGLE SECTION OF TOWER CONSIDERE D! >With all the swap nets, corners of garages holding 'spares', and plans that g et changed, keep this WTB in mind >when you hear someone looking to sell! Somebody's got to have some somewhere ! > >Thanks! WB9IQI - Patrick Croft > Daytime Tel:(317)257-6811 > Fax:(317)257-1590 > email:mai@iquest.net > > Gerald Williams, the proprieter of Texas Towers in Plano, TX, stocks the entire stuff for Weber's systems. At least a month ago, he told me he was going to go back and re-stock it. When Weber first started putting out the hardware, Gerald stocked it, then gave up on it for a while. However, when I expresesed interest in finally going through with the idea down here, he told me that he was going back into holding the stuff. It isn't a small project...... :) Mike Luther W5WQN as a guest at leviathan.tamu.edu From lwbyppp@epix.net Wed Jan 17 14:24:20 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: Frank Scutch Subject: WTD: Design for 17 meter Quad Content-Type: text/plain; charset=us-ascii Organization: Motorola, Inc. Date: Mon, 15 Jan 1996 15:45:23 GMT Message-ID: <1996Jan15.154523.9257@schbbs.mot.com> X-Mailer: Mozilla 1.1 (Macintosh; U; 68K) Mime-Version: 1.0 X-Url: news:rec.radio.amateur.antenna Content-Transfer-Encoding: 7bit Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 145.2.91.88 Lines: 12 Hello Fellas: I am not an experienced antenna builder but am wondering if someone could suggest or has the plans for a easy to build 2 element 17 meter quad. I am looking to experiment and am hoping to find something I can easily get parts for and can put together w/o much trouble. I would prefer something with a smaller boom no more than 8ft or so. Any suggestions? Frank, WB4AYJ From lwbyppp@epix.net Mon Jan 22 19:53:22 1996 Path: news.epix.net!usenet From: amsoft@epix.net Newsgroups: rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna Subject: !!! HOT High Tech WWW Site !!! Date: Thu, 18 Jan 96 22:20:53 PDT Organization: epix.net Lines: 12 Message-ID: NNTP-Posting-Host: lwbyppp69.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Xref: news.epix.net rec.radio.amateur.space:6150 rec.radio.amateur.policy:32618 rec.radio.amateur.misc:97067 rec.radio.amateur.homebrew:12801 rec.radio.amateur.equipment:23890 rec.radio.amateur.digital.misc:13664 rec.radio.amateur.antenna:18548 Covering Amateur Radio, Electronics, Engineering, Space, Scanners Shortwave, and many more interesting Technical Areas. Includes 0ver 400 WWW links, and a link to our September 95 CD-ROM archive with over 23,000 files online. Very HOT High Tech WWW Site http://hamster.business.uwo.ca/~amsoft/ Surf The High Tech World from here today! From lwbyppp@epix.net Mon Jan 22 19:53:23 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!reeve.research.aa.wl.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: bj@gin.or.JP (kazumasa kawase) Newsgroups: rec.radio.amateur.antenna Subject: (none) Date: 16 Jan 96 13:20:13 GMT Organization: ucsd usenet gateway Lines: 2 Message-ID: <9601161320.AA00005@bj.gin.or.jp> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu subscribe From lwbyppp@epix.net Mon Jan 22 19:53:24 1996 Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: 100 MHz Noise Cancel Ant? Date: 16 Jan 1996 20:31:47 GMT Organization: Hewlett Packard Corvallis Site Lines: 19 Message-ID: <4dh1vj$1r2@hpcvsnz.cv.hp.com> References: <960116175031_73517.3652_HHB54-1@CompuServe.COM> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Greg Prior (73517.3652@compuserve.COM) wrote: : I have been looking for an antenna for my FM (broadcast band) radio. The : challenge is: I want to use it in my work building which has LOTS of PCs nea rby. : Most of what I hear on the radio is computer buz. Does anyone know of a sma ll : (I have a Sony ICF-2001 in a cubicle) antenna that can be purchased or built (I : like to build) for this situation? Or maybe the answere is filtering? If you are constrained to keep the antenna inside, I'm afraid the answer is filtering alright. Filtering on each PC that's emitting noise. Undoubtedly the noise is being "transmitted" by the PCs on the frequencies you want to listen to, and unless you get your antenna away from the noise or the noise away from the antenna, you are going to have problems. Polarization of the antenna or directionality of the sort you can reasonably get indoors is unlikely to help. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Mon Jan 22 19:53:25 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!csulb.edu!drivel.ics.uci.edu!news.service.uci.edu!usenet From: dbwillia@uci.edu (Brian Williams) Newsgroups: rec.radio.amateur.antenna Subject: Re: 2 meter antenna for Ford Aspire Date: 17 Jan 1996 20:40:07 GMT Organization: UCI Medical Center Lines: 19 Message-ID: <4djmr7$h43@news.service.uci.edu> References: <4d789r$np4@news.usit.net> NNTP-Posting-Host: dialin9110.slip.uci.edu Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4d789r$np4@news.usit.net>, rwerner@usit.net says... >I need a 1/4 wave antenna that does NOT require drilling. Can someone >out there suggest an antenna? >Bob Werner Bob, If you would like a stealth antenna, and don't care about AM reception, you could also install a coupler that allows you to replace your am/fm antenna on the cars fender and replace it with a 1/4 wave 2 meter ant. With the coupler attached, you can still receive fm and 2 meter at the same time without danger of blowing out your am/fm radio when you transmitter. If you wish I can find out what the power capability is and approx. prices. I did this to my company car, and when it was time to turn it in, it took me about 20 minutes to return it to normal. I'm currently using on my '67 mustang and it works pretty well. Radiation pattern isn't as good as an antenna in the middle of the roof, but no damage to paint and it seems to do a better job (INHO) than when I was using a glass mount (but it is more expensive). Good luck, Brian N6ZAU From lwbyppp@epix.net Mon Jan 22 19:53:27 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.connect.com.au!yarrina.connect.com.au!diablo.OntheNet.com.au!news From: Jon Jenkins Newsgroups: rec.radio.amateur.antenna Subject: Announce: New RF Design sw for Windows Date: 17 Jan 1996 20:42:48 GMT Organization: Academic Technologies Lines: 94 Message-ID: <4djn08$ro4@diablo.OntheNet.com.au> NNTP-Posting-Host: ts-gc-3-p2.onthenet.com.au Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) RF: The Analog Analysis Program by Academic Technologies RF is a new inexpensive circuit simulation sw package for Windows, Windows 95 and Windows NT. It is primarily intended for Radio Frequency design but is applicable to all frequencies. Come and have a look, visit out Web site at: http://www.onthenet.com.au/~academic/Welcome.htm or download the readme.txt and rfdemo.zip demo version from: ftp.onthenet.com.au in /pub/acdemic/ or mail us at: academic@onthenet.com.au Briefly RF has the following functions: Tools Convert between S,Y,Z and ABCD two port parameters Design Butterworth and Chebichev Filters Design and analyse coil and wire inductors Sophisticated Microstrip design and analysis Design parallel, series resonators and LC filters Complex/Polar calculator Compnents Capacitors (includes parasitics) Resistors (includes parasitics) Inductors (Q included ) Curve fitted S parameter devices and whole circuits (fit types: rational, polynomial, spline, ls, linear) OpAmps Transmission Lines (ideal and lossy, open and shorted) Transformers (ideal and non ideal, leakage inductances and resistances) FETS (all parasitics) Tapped Inductors (Q and parasitics) Beta controlled current sources (all parasitics) VCCS Mutual inductors (all parasitics) Source and Loads DC source Analysis Facilities Swept frequency (Full and Nodal) Single frequency component tolerance Swept frequency component tolerance DC bias point analysis Pulse analysis (Fourier simulated) Text Output Transducer gain Linvil c stability Stern k stability Input impedance Output impedance Input admittance Output admittance Voltage gain S11, S12, S21, S22 S parameters Input reflection coefficient Output reflection coefficient Maximum transducer gain possible Source admittance/impedance to obtain Gtmax Load admittance/impedance to obtain Gtmax Graphical Output Voltage Gain Transducer gain Input impedance Output impedance S11, S12, S21, S22 S parameters Input reflection coefficient Output reflection coefficient Pulse time trace Multiple "tagged" plots Autoscaling or manual scale Auto cursor tracking (warps to and displays the nearest points) or absolute Points or line traces --------------------------------------------------------- Name: Academic Technologies Bongaree Rd, Voice/Fax: 61-7-55-905-008/013 Terranora, Inet: academic@onthenet.com.au NSW, AUSTRALIA 2486 ---------------------------------------------------------- From lwbyppp@epix.net Mon Jan 22 19:53:28 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: joelukas@ix.netcom.com(Joe Lukas ) Newsgroups: rec.radio.amateur.antenna Subject: ANRENNA, 114' PORTABLE, WHERE TO ADVERTISE Date: 17 Jan 1996 02:15:58 GMT Organization: Netcom Lines: 37 Message-ID: <4dhm4u$m4j@ixnews8.ix.netcom.com> NNTP-Posting-Host: ix-tf5-17.ix.netcom.com X-NETCOM-Date: Tue Jan 16 6:15:59 PM PST 1996 PORTABLE 114 ' ANTENNA MASTS Mobile 114' antenna manufactured by TRI-EX Tower Corp. for US Military at a cost of $193,779 ea. The antenna is a seven section, telescoping mast designed to support three four foot diameter dishes. Each dish can be in dividually controlled in it's tilt axis. The system is powered by two 10kw diesel generators driving electric over hydraulic motors operating cables to hoist the mast. The unit includes hydraulic controls for the above a nd for stabilizers, a power distribution box and an aluminum trailer with pintle hitch. This unit is ideal for a government's emergency program to set up com links in case of a natural disaster, for a large remote construction project or unit could also be used to mount high tech video equipment for peaking over tree tops. Overall Dimensions are: 352" L x 98"W x 98" H. Total weight is approximately 15,600 Lbs. NSN : 5895-01-156-0572. Units have under 10 hours running time. Price Ea. $35,000 US. Contact: Joe Lukas Federal Resource Corp. 2201 Barren Hill Road Conshohocken, Pa. 19412 Ph. 610.828.3500. X 118 Fax 610. 828.2362 From lwbyppp@epix.net Mon Jan 22 19:53:29 1996 Path: news.epix.net!uunet!in2.uu.net!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!gumby!newspump.wustl.edu!news.starnet.net!wupost!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.antenna Subject: Re: Apartment Antenna Selection? Date: Sat, 20 Jan 1996 16:12:11 GMT Organization: Inlink Lines: 39 Message-ID: <4dr4h8$fmc@news1.inlink.com> References: <4dndam$gui@brickbat.mindspring.com> NNTP-Posting-Host: slip30.inlink.com X-Newsreader: Forte Free Agent 1.0.82 gtomlin@mindspring.com (GFT) wrote: >I just moved into an apartment which obviously limits my selection of >suitable antennas for VHF/UHF. I primarily work 2m and 70cm and would >like any input from others who are in a similar situation. I want to >use an indoor antenna and am located on the highest floor of the >building which is about halfway up a small hill which may hamper my >line of sight to the local repeater. >Any help would be appreciated! >Grant >KF4FTL Hi Grant I lived in apartments for many years and found numerous ways to get around the antenna problems. The most unique was building a multi-band J-Pole, 4 inches in diameter at the base and mounting it in a terra cotta clay flower pot. The coax was hidden inside a garden hose and a dummy (gutted) faucet was glued to the wall for the input to the shack. The antenna sat right out in the open on the balcony. If you have a tree closeby, you could also build a ribbon J-Pole and hang it in the tree or let it hang out your window while you are on the air. It could also be made right on the window using copper or aluminum foil tape. J-Pole dimensions and plans can be found on my web-page, including K-Factor tables for larger diameter tubing. http://www.inlink.com/~raiar TTUL - 73+ de Gary - KG0ZP From lwbyppp@epix.net Mon Jan 22 19:53:30 1996 Path: news.epix.net!news.sprintlink.net!cyberspace.com!imci2!newsfeed.internetmci.com!news.cfa.org!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.antenna Subject: Continuous loaded Verticals?? Date: Sun, 14 Jan 1996 20:37:08 -0600 Organization: Olivet Nazarene University Lines: 7 Message-ID: NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Anyone who is using a continuously loaded vertical on 160m, please send me data!!! Include length, wire size and winding pitch, matching network and feed specifics, please! Thanks in advance. KF8ZN Mike From lwbyppp@epix.net Mon Jan 22 19:53:31 1996 Path: news.epix.net!uunet!in1.uu.net!news.net99.net!news.burgoyne.com!news.aros.net!usenet From: mfp@aros.net (MFP - KB7YJJ) Newsgroups: rec.radio.amateur.antenna Subject: CQ: All HF remote base users.............. Date: 21 Jan 1996 17:32:06 GMT Organization: ArosNet Lines: 15 Message-ID: <4dttam$otu@news.aros.net> NNTP-Posting-Host: anp9.aros.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Attention all other REMOTE HF group operators: We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller) at our rptr site...... I would be very happy to hear what antennas you guys are using... We tried an R7 and it was noisy, BUT would snap under our icing - windloading at our site..... Our next bet might be a dipole... how bought the Gap Challenger 80-6 meter antenna, any more rugged or less-rugged than the R&!!! From lwbyppp@epix.net Mon Jan 22 19:53:32 1996 Path: news.epix.net!news.sprintlink.net!news.genesis.net!news.atlantic.net!netaxs.com!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail From: c002@Lehigh.EDU Newsgroups: rec.radio.amateur.antenna Subject: Crossbanding antenna Dip or Duplexer? Date: 15 Jan 1996 19:06:33 -0500 Lines: 15 Message-ID: <4deq69$2tcr@ns4-1.CC.Lehigh.EDU> NNTP-Posting-Host: ns4-1.cc.lehigh.edu Hello, i would like to run my dual band rig crossbanding into ONE antenna now, do i need to get one of those small duplexers for 30-40$ or a multi hundred cavitiy? thanks private replys would be nicer David |-----------------------------------------------------------------------| | David Roseman | c002@lehigh.edu OUTTA ORDER! | | Saucon Valley Sen. HS | | | SysOp of NODE 3 BBS | The Flying HAm - BBS | | | Running OBV/2 Software | Technomage - BBS | | | | N3SQE/1 - HAm V | | | N3SQE@Nxxxx.FNxxxx.PA.USA.NA - Packet | From lwbyppp@epix.net Mon Jan 22 19:53:33 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!news.sfo.com!news.zeitgeist.net!wizard.pn.com!mozo.cc.purdue.edu!purdue!ames!agate!news.mindlink.net!van-bc!news.cyberstore.ca!news From: disaac@silk.net (Donovan Isaac) Newsgroups: rec.radio.amateur.antenna Subject: Dipole optimized for 55.25MHz and 77.25MHz Date: Sun, 14 Jan 1996 05:13:10 GMT Organization: Cyberstore Systems, Inc. Lines: 47 Message-ID: <4da3mt$hn@sulla.cyberstore.ca> NNTP-Posting-Host: 204.244.77.22 X-Newsreader: Forte Free Agent 1.0.82 Yeah, I know. It's the TV Band. Specifically Ch2 and 5. Here's my problem. I built a dipole antenna optimized for those two channels. The first night that I had excellent reception. The next day, let's just say that the reception was less than desirable. The dipole antenna is made from 300ohm twin lead and is 195.2 cm long (76.85") The formula I used to calculate the langth of the dipole is as follows: (Which I recieved from my communications systems professor) 1. Geometric Mean of the 2 carrier frequencies. Square_root of (55.25MHz x 77.25MHz) = 65.33MHz 2. Calculate the Wavelength WaveLgth = c / f = 4.592m (180.8") 3. Calculate half of the wavelength = 2.296m (90.39") 4. Take 85% of that value = 1.952m (76.85") I originally suspected that the 50-ohm coax cable was at fault. (Yes, I am using a matching transformer) Not so. I highly suspect that it is the fault of the stucco (aka, chicken wire) apartment building that sits between me and the transmission station on Knox Mtn. (I also live in an apartment building) Tonight (The next night) I could drag in BCTV but not CHBC. The weather was cloudy. I figure that CHBC transmitts from knox mountain, roughly NNW of me. The dipole was facing SW. I believe that it was clear yesterday. I assume that the weather is also playing a large factor. Does anyone have any suggestions? Mounting the antenna higher is _not_ an option here. I would like to mount the antenna on the roof, but its against strata rules. I was thinking of putting up a reflector in behind and then another one quarter wavelength antenna in front of the half wave dipole. If I do this, would the sensitivity increase? What If I built a section that was 1 wavelength long? please e-mail dissac@silk.net and/or post here. any help would be greatly appreciated. From lwbyppp@epix.net Mon Jan 22 19:53:34 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!news.cyberstore.ca!math.ohio-state.edu!cs.utexas.edu!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) Newsgroups: rec.radio.amateur.antenna Subject: Dipole using #26 gage wire. Date: 15 Jan 1996 17:03:32 GMT Organization: Netcom Lines: 19 Message-ID: <4de1d4$em6@ixnews2.ix.netcom.com> References: <4da3mt$hn@sulla.cyberstore.ca> NNTP-Posting-Host: ix-pon-mi3-06.ix.netcom.com X-NETCOM-Date: Mon Jan 15 9:03:32 AM PST 1996 Travelling alot I wanted a super light dipole for 40m. I have tried many portable designs but prefer the dipole. I don't like using a tuner unless nessesary and work 40m cw only. The question is how does the gage of wire used affect the antenna? Your comments are welcome on the following: a.) I assume the higher gage wire would have lower velocity factor and need to be longer. b.) Does the higher resistance wire cause the antenna to be any sharper or more broadband in respect to SWR? c.) Any limits on wire size? Thanks to all who can share something. Tim, ka8ddz From lwbyppp@epix.net Mon Jan 22 19:53:35 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: 73517.3652@compuserve.COM (Greg Prior) Newsgroups: rec.radio.amateur.antenna Subject: Folded Log Periodic Date: 17 Jan 96 06:48:53 GMT Organization: ucsd usenet gateway Lines: 15 Message-ID: <960117064852_73517.3652_HHB22-2@CompuServe.COM> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I just ran across an article on a Log Periodic Array with a twist. The elemen ts are folded into half-wave delta loops. I found the article in the "ARRL Anten na Compendium", page 48 called "A Wide-Band, Low-Z Antenna - New Thoughts on Smal l Antennas". There is only a sketch of the antenna, no building info. The sket ch looks promising. It covers 20-30 MHz and is 8' wide and 12' 4" long. A 14-30 MHz Antenna would be more interesting to me. So: 1. Are there any other construction articles on this antenna? 2. Has anyone built this antenna? 3. Has anyone modeled this antenna? I would be interested in any and all comments. Thanks, Greg - AC6IY From lwbyppp@epix.net Mon Jan 22 19:53:36 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!xara.net!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: G5RV Reviews? Date: 14 Jan 1996 01:55:01 GMT Organization: Intel Corporation, Chandler, AZ Lines: 14 Distribution: world Message-ID: <4d9npl$1imv@chnews.ch.intel.com> References: <4cgjte$4vc@ixnews4.ix.netcom.com> <9601080536177457@saloon.bcbbs.net> NNTP-Posting-Host: vegas.ch.intel.com In an article, Scott N0XZY wrote: >As for sigs, made some 10m phone contacts during the recent contest, >to a PQ station, LU... Mine is configured for east and west signals. Hi Scott, if your antenna is the 100-105 ft class of G5RV, your radiation pattern on 10m is not east/west. When the length of a dipole in feet exceeds 1170/freq, the pattern is multi-lobed with almost no broadside radiation. On 10m your pattern will be somewhat NNE/SSE/NNW/SSW. For a 102 ft. G5RV, a cloverleaf pattern starts at about 12 MHz. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Mon Jan 22 19:53:37 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!news.netins.net!usenet From: crcarlson@netins.net Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Antennas Date: 17 Jan 1996 03:19:24 GMT Organization: INS Information Services, Des Moines, IA USA Lines: 40 Message-ID: <0099C7E0.FCA54A7B@netins.net> References: <4dfj24$7rm@ixnews2.ix.netcom.com> Reply-To: crcarlson@netins.net NNTP-Posting-Host: ins.netins.net In article <4dfj24$7rm@ixnews2.ix.netcom.com>, HOPTASV@ix.netcom.com(Scott Hop ta ) writes: >Hello Everyone: > >I looking at purchasing a vertical antenna and was wondering if anyone >has used any of the Gap antennas and if you can tell me how they >perform. > >I saw thier add in the December QST and like the idea of no traps ... >etc. > >It looks like it also has a bigger band width then other verticals. > >Any thoughts would be appreciated. > >Thanks > >Scott Hopta (N0NXY) > Scott: I know someone will come along and roast me for any kind of support for GAP an tennas but I've used one for about 3 or more years. I will *briefly* tell you what my fee lings are on them. I used the Challenger DX-VIII. Reason: I needed something to survive ice storm s in Northern Iowa, I wanted something that was multi-band, I couldn't get any kind of radia l system up and stay married and I didn't really have room for a dipole (which is about the be st "simple" antenna that I have used). In actual usage I used it running about 50% QRP@ 3 watts and 50% 100 watts. All c.w. Even when the spots were no where near as good as at t he peak, i.e. 3 years ago, I could work UA's and other dx with 3 watts, and get 559 reports. This was mostly on 20 and 15 meters. On 40 meters I worked okay to pretty good . On 80 it was terrible. There are, to be sure, better antennas. You will need to decide what you can d o. If you can get a decent radial system out then I wouldn't necessarily recommend this antenna. IF you can get some decent wire antenna up, i.e. dipoles at good heighth, loop s, etc. then I'd go that way. These are not "yagi at 70 ft" that I rather have but wit h good operating technique they work. Oh they are kind of pricey. A large loop fed wi th a tuner would be about 1/8th the cost and probably more efficient. Thats my $.02 worth. (I am now putting on my asbestos underwear.) 8-) From lwbyppp@epix.net Mon Jan 22 19:53:38 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lille1.fr!ciril.fr!news.imag.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Antennas Date: 17 Jan 1996 14:32:00 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 19 Message-ID: <4dj190$27ve@info4.rus.uni-stuttgart.de> References: <4dfj24$7rm@ixnews2.ix.netcom.com> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >I looking at purchasing a vertical antenna and was wondering if anyone >has used any of the Gap antennas and if you can tell me how they >perform. Hello Scott, It has been stated several times that all no-radial verticals are very poor performers and that they are easily beat by a simple dipole. Even in a recent product review over here the author admitted that its signal was 1 - 2 S-points low compared with a simple dipole at the same height. And this although product revievs are generally heavily biased towards the product reviewed! One thing is sure, that GAP's claim of 95% efficiency is a blatant lie and that 5% would be more realistic. There are "satisfied" users of such antennas, but OTOH it is hard to admit that an antenna is poor if you have paid a lot for it. 73, Moritz DL5UH From lwbyppp@epix.net Mon Jan 22 19:53:39 1996 Path: news.epix.net!uunet!in2.uu.net!news.accessone.com!news From: vbook@vbook.com (Ed Mitchell) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna,rec.radio.scanner,rec.radio.shortwave,rec.radio.amateur.equipment Subject: Ham Radio Online Magazine Has a Whole New Look! Date: 21 Jan 1996 18:50:50 GMT Organization: Virtual Publishing Co. Lines: 17 Message-ID: <4du1ua$7c0@news.accessone.com> NNTP-Posting-Host: vbook.accessone.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Xref: news.epix.net rec.radio.amateur.misc:97084 rec.radio.amateur.policy:32629 rec.radio.amateur.digital.misc:13683 rec.radio.amateur.antenna:18566 rec.radio.scanner:44064 rec.radio.shortwave:69066 rec.radio.amateur.equipment:23910 Check out our new layout at Ham Radio Online magazine. As always, its free and free of ads. The coolest and classiest Ham Radio site on the web. Check out th e new articles this week - Reviews of HF propagation prediction software, an article on a proposal to reinstate the low power Class D commercial broadcast FM license and much more! We are not just pointers to cyberspace - we've got content - real stories on everything having to do with radio telecommunications! http://www.accessone.com/~vbook/hronline.htm ------------------------ personal email to vbook@vbook.com Visit Ham Radio Online, it's free, at http://www.accessone.com/~vbook/hronline.htm From lwbyppp@epix.net Mon Jan 22 19:53:40 1996 Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: NATOLI@bnlarp.bnl.GOV (Tony Natoli, 516-282-3976) Newsgroups: rec.radio.amateur.antenna Subject: RE: Ham-Ant Digest V96 #12 Date: 17 Jan 96 00:15:47 GMT Organization: ucsd usenet gateway Lines: 1 Message-ID: <960116191547.20c00adb@bnlarp.bnl.gov> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu unsubssribe ham-ant From lwbyppp@epix.net Mon Jan 22 19:53:41 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.u.washington.edu!news.alt.net!news.net99.net!news.localnet.com!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!wizard.pn.com!brighton.openmarket.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: NATOLI@bnlarp.bnl.GOV (Tony Natoli, 516-282-3976) Newsgroups: rec.radio.amateur.antenna Subject: RE: Ham-Ant Digest V96 #12 Date: 17 Jan 96 00:16:18 GMT Organization: ucsd usenet gateway Lines: 1 Message-ID: <960116191618.20c00adb@bnlarp.bnl.gov> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu unsubscribe ham-ant From lwbyppp@epix.net Mon Jan 22 19:53:42 1996 Path: news.epix.net!news.sprintlink.net!mercury.galstar.com!usenet From: Dan Sitterley Newsgroups: rec.radio.amateur.antenna Subject: HELP:What did I buy?? Date: Wed, 17 Jan 1996 20:07:14 -0800 Organization: Galaxy Star - Northeastern Oklahoma Internet Lines: 17 Message-ID: <30FDC772.3F44@galstar.com> NNTP-Posting-Host: star159.galstar.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) I recently purchased 5 sections of what I thought was ROHN 45 tower only to find out that it is smaller than ROHN 45 (which has an 18" face) and larger than ROHN 25 (which has a 12" face). This tower has a 15" face and has the same Z bracing as ROHN. I took a section to our club meeting and no-one had seen anything like it. I need to find a top section for it and don't know where to start looking. I believe that the legs are 1.25" in diameter and is made of very heavy zinc coated metal. Any help would be appeciated. -- Thanks, Daniel M. Sitterley - MCNE KA3GRJ Tulsa, OK dsitter@galstar.com From lwbyppp@epix.net Mon Jan 22 19:53:43 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!msunews!news.gmi.edu!zombie.ncsc.mil!nntp.coast.net!howland.reston.ans.net!newsxfer.itd.umich.edu!qiclab.scn.rain.com!gasco!nntp.teleport.com!usenet From: Daniel Calzaretta Newsgroups: rec.radio.amateur.antenna Subject: Info Needed on Butternut HF9VX Date: 21 Jan 1996 18:36:17 GMT Organization: Pacific Crest Community School Lines: 8 Message-ID: <4du131$n60@maureen.teleport.com> NNTP-Posting-Host: ip-pdx09-21.teleport.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I am looking at buying the Butternut HF9VX with counterpoise. Does anyone have experience with this antenna? I would appreciate any and all comments. Thanks, Dan N9BCC/7 From lwbyppp@epix.net Mon Jan 22 19:53:44 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!news.worldlinx.com!news From: "Marc J. Hemphill" Newsgroups: rec.radio.amateur.antenna Subject: Re: Info request on DDRR antenna Date: Wed, 17 Jan 1996 17:14:04 -0400 Organization: WorldLinx Telecommunications Inc. Lines: 56 Message-ID: <30FD669C.4B51@ra.isisnet.com> References: <1996Jan11.185430.25991@galileo.cc.rochester.edu> NNTP-Posting-Host: hemphill.bio.ns.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win16; I) Bill VanRemmen wrote: > > I am thinking of building a DDRR antenna for 10 meters > > blah blah blah > > Does anyone have any experience with this design? Any idea how it performs > versus a dipole? Is the radiation vertical or horizontally polarized? > Any problem with putting a 2m ring inside the 10m ring? > > --Several years ago I built a 20 Meter DDRR that was mounted under a truss style roof. It was a 'dipole' DDRR (ie it had both a top and bottom ring. It was made of 1/2 copper pipe. the 'vertical' section of the ring was about 12 or 14 inches high. the feed to this vertical section was through 50 ohm coax from a 1:1 balun using a delta arrangement. I didn't use a tuning capacitor at all. Instead I varied the distance between the ends of the ring by attaching fishing line to it and a Rube Goldberg screw driven arm. A few inches difference 'rubbered' the tuning point across a large portion of the band. ( can't remember if it was the whole band or not). The bandwidth was narrow with 3 db points of maybe 15 Khz. Can't remember exactly but it was close to the theoretical value. That's good for two reasons: 1) It rejects adjacent signals and broadband noise wonderfully, 2) It must have been fairly efficient or the BW would have been flatter due to the lower Q from the losses. I had no problems working/hearing stations but then I don't typically do the DX thing. Take off angle should be low if you build the dipole version or are working against an excellent ground. It is vertically polarized. The Gotchas: The whole thing has to be very low loss, after all the antenna is effectively a foot high. Forget about versions using using muffler pipes working against a poor ground. Might as well get a tuner and load the bed springs. It has to be very stable mechanically or it will go out of tune when a mouse sneezes. You can tune on background noise to get it close but my receiver AGC makes that difficult. I can now disable my AGC. A noise bridge is handy for adjusting the Delta feed. There are a lot of variables to contend with and lot of calulating involved. There was a 2 part article by the inventor in either Ham Radio or 73 many years ago. All the theory and practical data is there. He called it a Directly Driven Ring Radiator. It was designed for military use and he won an award for it. I'll dig into my archives and try to get the details for the mag and issue. Unfortunately, I moved to a new house not long after I put it up. Because it was assembled 'around' the roof trusses, it was disassembled with a tubing cutter and never put back into service. From lwbyppp@epix.net Mon Jan 22 19:53:45 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip22.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.antenna Subject: Re: Info request on DDRR antenna Date: Wed, 17 Jan 1996 20:56:01 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 20 Message-ID: References: <1996Jan11.185430.25991@galileo.cc.rochester.edu> <30FD669C.4B51@ra.isisnet.com> NNTP-Posting-Host: usr4ip22.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <30FD669C.4B51@ra.isisnet.com> "Marc J. Hemphill" writes: >From: "Marc J. Hemphill" >Subject: Re: Info request on DDRR antenna >Date: Wed, 17 Jan 1996 17:14:04 -0400 [snip] >There was a 2 part article by the inventor in either Ham Radio >or 73 many years ago. All the theory and practical data is >there. He called it a Directly Driven Ring Radiator. It >was designed for military use and he won an award for it. I'll >dig into my archives and try to get the details for the mag >and issue. If it will help in your search, the inventor was Joe Boyer, W6UYH. I also have the articles somewhere, but apparently not where I remember. 73, Wes -- N7WS From lwbyppp@epix.net Mon Jan 22 19:53:46 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!news From: jscott@maroon.us.dell.com (John Scott) Newsgroups: rec.radio.amateur.antenna Subject: J-Pole calculations Date: Wed, 17 Jan 1996 19:09:23 GMT Organization: Dell Computer Corporation Lines: 7 Message-ID: <4djhhn$5lv@uudell.us.dell.com> NNTP-Posting-Host: jscott.us.dell.com X-Newsreader: Forte Free Agent 1.0.82 Does anybody know where I could get the actual calculations needed for J-Pole design. I am interested in playing around with different diameters of pipe etc. Thanks ahead of time From lwbyppp@epix.net Mon Jan 22 19:53:47 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!fury.berkshire.net!op.net!agis!frankensun.altair.com!newsserver.pixel.kodak.com!newsserver.rdcs.Kodak.COM!usenet From: jeutter@kodak.com (Andy Jeutter) Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: Thu, 18 Jan 1996 06:33:17 GMT Organization: Eastman Kodak Company Lines: 36 Message-ID: <4dkpgd$8cc@kodak.rdcs.Kodak.COM> References: <4dbe97$gnt@crusher.ici.net> NNTP-Posting-Host: mgpc3.ag01.kodak.com X-Newsreader: Forte Free Agent 1.0.82 tsmith@ici.net (Tim Smith) wrote: >I'm thinking about buying one...any pros/con? Does your have the internal >resistance (aka impedance) bridge? Is the built in counter worth it? Any >success/horror stories in antenna building using these? Better than or does >it compliment a dip meter? Are the wide range ones (1.8-170MHz)vernier tuned >and stable enough for handheld operation? >Thanks, >N1BTQ >Tim Smith >Email: tsmith@ici.com >WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html >Fax: 508-758-9605 Tim, the MFJ 259 consists of a resistive Wheatstone-Bridge that is feed by a RF osciallator. The rectified bridge voltage is shown on the instrument. A similar design is shown in QST December 1967 p. 39 (the R. T. Hart noise bridge, also US Patent 3531717). Thus you can use the MFJ 259 for all the jobs you can use a noise bridge. Get the free manual from MFJ to see how useful it can be for an antenna experimenter. Also the designer of the device is here on the net. You can ask him if you have any specific questions. Once he answered mine very kindly. 73 Andy, DL4SEI From lwbyppp@epix.net Mon Jan 22 19:53:48 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!cs.umd.edu!zombie.ncsc.mil!paladin.american.edu!gatech!newsfeed.internetmci.com!uwm.edu!news.inap.net!news.enteract.com!delta.misha.net!news From: rsellers@misha.net (Roger W Sellers) Newsgroups: rec.radio.amateur.antenna Subject: need APRS setup help Date: 22 Jan 1996 04:31:04 GMT Organization: Midwest Information Super Highway Access Group, Inc. Lines: 9 Message-ID: <4dv3u8$57n@delta.misha.net> NNTP-Posting-Host: dial02.misha.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 I need assistance in getting an ICOM Z1A HT configured to my Kantronics KPC-3 and laptop computer. I'm anew HAM and don't understand some of the configuration requirements like UNPROTO. Some guys here are trying to help, bu t no one is yet shall we say an expert with it yet. Thanks in advance, 73. Roger KB9LBU From lwbyppp@epix.net Mon Jan 22 19:53:49 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!news.fibr.net!nntp.news.primenet.com!news.primenet.com!stanl From: Stanley Lalli Newsgroups: rec.radio.amateur.antenna Subject: Need mod for GE Masterpro (repeater) Date: 16 Jan 1996 21:48:01 -0700 Organization: Primenet Services for the Internet Lines: 12 Sender: root@primenet.com Message-ID: <4dhv21$f9l@nnrp1.news.primenet.com> X-Posted-By: stanl@usr1.primenet.com I am looking for any mods regarding the GE Masterpro. I want to convert one for repeater use. I know it can be done. I just can't seem to find any schematics, diagrams, or information about this radio. I have also heard it is simular to the Motorola Micor. If anyone has any info, please reply... Thanks. -- \`O.o' =(_ _)= U stanl@primenet.com From lwbyppp@epix.net Mon Jan 22 19:53:50 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!pipeline!news From: dsantoro@pipeline.com (Dave Santoro) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Needed: Eggbeater Plans Date: Tue, 16 Jan 1996 16:33:50 GMT Organization: JRP Securities, Inc. Lines: 12 Message-ID: <4dgk1d$see@news.nyc.pipeline.com> Reply-To: dsantoro@pipeline.com NNTP-Posting-Host: dsantoro.nyc.pipeline.com Xref: news.epix.net rec.radio.amateur.homebrew:12784 rec.radio.amateur.antenna:18522 Am looking to homebrew an Eggbeater Antenna dor Sarex/Mir operation. Can anyone point me to a site or file with plans? Thanks, & 73, _______________________________________________________________________ David H. Santoro | dsantoro@pipeline.com | Amateur Radio Systems Analyst | dsantoro@compuserve.com | Callsign JRP Securities, Inc. | dsantoro@msn.net | N2VYP ----------------------------------------------------------------------- ** From lwbyppp@epix.net Mon Jan 22 19:53:51 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet Newsgroups: rec.radio.amateur.antenna Subject: Re: Repeater Antennas Message-ID: From: Bill Harwood Date: Thu, 18 Jan 1996 18:57:19 GMT Sender: usenet@avalon.chinalake.navy.mil (NAWS news admin) References: <4d9d67$83d@earth.njcc.com> Organization: NAWS, China Lake, CA Content-Type: text/plain; charset=us-ascii To: ahusik@pluto.njcc.com Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:4d9d67$83d@earth.njcc.com Lines: 77 ahusik@pluto.njcc.com (Adam Husik) wrote: > >We are currently in the planning stage of setting up a VHF repeater >with approximately 30-50 watts. The location will be on the top of a >house which is approximately at 300'. The house is located on one of >the highest points in Princeton NJ, Great Rd. There are trees in the >area, however, I'm not sure how relevant that is due to the fact that >we are using VHF. My question is: is there a way to calculate the >usable range of this repeater system, given that we use a directional >or omnidirection antenna. We don't know a lot about antennas but want >to get the maximum range possible with the least power. > >Any suggestions? > >Adam Husik >KB2UTP > > Since you are not getting an overwhelming response, I will try. First, you are embarking on a journey to build a repeater so you will do a lot of learning and make a lot of mistakes and will have to redo many things. Don't give up and keep plugging. When someone tells you how dumb you are for doing something remember they probably made the same dumb mistake when they started. Given that; read the repeater antenna sections of ARRL Handbook and the ARRL Antenna Book. For a repeater you probably want a more durrable antenna than you might use at home. The repeater does provide a service to the amateur community. 1. What kind of winds do you face? Remember hurricanes, noreasters and such. The long fiberglass claimed highgain antennas from dimond and comet don't do so well. 2. What kind of cold weather, ice and snow loading do you face? 3. What kind of tower mounting and how much tower space can you use up? You are probably a guest or low cost user so mke sure you are considerate in this area. 4. What is your coverage area? Is it omni directional or figure eight or cartoid in nature. Use an antenna or antennas which have patterns which match the coverage area. This maximises your signal in areas where people are and minimises them where people arn't. It also minimises the conflict and overlapping with neighboring repeaters on the same or close frequencies. Remember you need less RF over water than land in a coastal situation. Also remember that very high gain verticals tend to put lots of RF at the horrison but may have nulls under the antenna. ie a mobil on the horrizon may be full quieting while a handie talkie a couple of miles away can't get into the repeater. All this said here are some sugggestions. A two, four or eight bay dipole or folded dipole set. These tend to be durrable and can be easily set up to optimise coverage area. They also can be placed on tower legs to conserve space. Station Master Commercial verticals. They are rugged. If your coverage area is cartoid or hemispherical a lazy beam may work well. That is a two or three element beam with good front to back characteristics but pretty poor forward directional pattern. Look to your local commercial two way radio shops for ideas. They will know a lot about successful repeater installations for your area. Good COAX is must. Leakey or lossy coax leads to desensitization. Lose RF fromr your transmitter is near your recieve frequncy sos use 99-100% shielded transmission line such as hardline or 9913 type coax to reduce headaches. Good Luck and don't get discouraged!!!!! \------------------------------------------------------/ \ Bill Harwood U play it, I'll dance it / \ AB6DY or / \ I'll play it, U dance it / \----------------------------------------------/ From lwbyppp@epix.net Mon Jan 22 19:53:52 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: Paul Moller Subject: Re: REPEATER ANTENNAS Content-Type: text/plain; charset=us-ascii Organization: MOTOROLA Date: Thu, 18 Jan 1996 12:06:54 -0600 Message-ID: <30FE8C3E.182F@csg.mot.com> X-Mailer: Mozilla 2.0b3 (Win95; I) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit References: <4dhia8$7cl@chleuasme.francenet.fr> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 144.188.36.8 Lines: 36 It would not be fare to say that the trees do not make any difference. A dB of loss is a dB no matter how high above average terrain it is. Second. In this application you may want to use a high gain omni antenna. That many times seems to be the rule, but is not always the best choice. An example of when it is not a good choice is where you may be limited in overall height due to mechanical or other reasons. Then you want to use an antenna which balances getting your center of radiation up the highest with antenna gain. In one case there was a limit of 70ft total height. The better choice was to use a 6dB gain 7ft. tall antenna rather than a 9dB gain 15 ft tall antenna. As far as actual coverage predictions go, I have used the curves in the ARRL antenna handbook for path loss and found them to be pretty good. Lastly, everybody should have your problem of having a 300ft site!! moncef wrote: > > ahusik@pluto.njcc.com (Adam Husik) writes: > > > > We are currently in the planning stage of setting up a VHF repeater > > with approximately 30-50 watts. The location will be on the top of a > > house which is approximately at 300'. The house is located on one of > > the highest points in Princeton NJ, Great Rd. There are trees in the > > area, however, I'm not sure how relevant that is due to the fact that > > we are using VHF. My question is: is there a way to calculate the > > usable range of this repeater system, given that we use a directional > > or omnidirection antenna. We don't know a lot about antennas but want > > to get the maximum range possible with the least power. > > > > Any suggestions? > > > > Adam Husik > > KB2UTP From lwbyppp@epix.net Mon Jan 22 19:53:54 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: ir003432@interramp.com Newsgroups: rec.radio.amateur.antenna Subject: Re: RFI from ladderline? Date: Tue, 16 Jan 96 22:32:24 est Organization: PSI Public Usenet Link Lines: 57 Message-ID: References: <4d1c51$83k@news.cc.oberlin.edu> NNTP-Posting-Host: 38.12.1.169 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In Article<4d1c51$83k@news.cc.oberlin.edu>, writ e: > Path: interramp.com!interramp.com!psinntp!psinntp!howland.reston.ans.net!gat ech!newsfeed.internetmci.com!news.msfc.nasa.gov!sol.ctr.columbia.edu!news.ober lin.edu!ocvaxa.cc.oberlin.edu!PRUTH > From: pruth@ocvaxa.cc.oberlin.edu > Newsgroups: rec.radio.amateur.antenna > Subject: RFI from ladderline? > Date: 10 Jan 1996 21:47:13 GMT > Organization: Oberlin College, Oberlin, Ohio > Lines: 13 > Message-ID: <4d1c51$83k@news.cc.oberlin.edu> > Reply-To: pruth@ocvaxa.cc.oberlin.edu > NNTP-Posting-Host: alpha.cc.oberlin.edu > > I'm thinking of going to a ladder-line-fed dipole instead of my > coax-fed trap dipole to cut my losses in the coax from the > high SWRs of nonresonant antenna. While I have no problems using > the trap dipole, being able to tune it EVERYWHERE, including 160m, > I think I might get more rf to the radiator using ladder line. > A fellow ham advised me against using ladder line, saying it > produces a lot of RFI. Is this true? If so, would a current > balun at the feedpoint eliminate this alleged RFI? I'm using a > 50' run of RG8U coax to the trap dipole, by the way, which I'm > wondering might be just fine, and that I might be making > unnecessary work for myself, and that the losses now might not > be as bad as I might think. Thanks for your collective wisdom. > --Bill KB8USZ pruth@alpha.cc.oberlin.edu Use the ladder line. Here is my experience. Licensed since 1958, I have tried it all but I never used ladder line because of all the propaganda about how you have to keep it away from metal, run it straight, etc., etc. In Oct 93 I moved into 1.5 acre lot with 70' trees all over. Only clear area is the house and a 100 x 150 foot area for septic drain field. I put up 135 feet of wire feed in center with ladder line. My shack is in the basement. I drilled a 3/8" hole through the concrete block wall of the basement and enlarged it with a chisel so the ladder ine runs through it. Stuffed some insulation around it to keep out the wind and the critters. The ladder line runs up the side of the house (aluminum siding) across the roof, the straight up to the center of the antenna. The only precaution I took was to mount a piece of pressure treated 2 x 2 on the deck to hold the lineout from the house siding. I feed it through a MFJ-989C (their big tuner). It works like a champ. I do a lot of QRP work and I work anything I hear and I hear a lot. My only regret is that I did not go to ladder line 38 years ago. Right now, the ladder line is buried in two feet of snow on the roof. That just makes the tuner tune a little different. I just worked a 9G, a 6V, and a FN on 80 meter CW running 3 watts. Call the guy at Radio Works in Chesapeake, VA. Get him to send you the ready-made all-band antenna, 135 foot of wire with 100 feet of ladder line. Also, order a line-lock. It's a neat plastic device that clamps onto the line and the wire. Problem with ladder line is that, because of twisting i the wind, it will break at the soldered connection about once a year. The ladder lock prevents that. Get a couple of 200 foot lengths of nylon rope and start pulling it up. The higher the better. Keep everything straight. From lwbyppp@epix.net Mon Jan 22 19:53:55 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!inet.d48.lilly.com!evax01.d51.lilly.com!ga19989 Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Message-ID: <1996Jan18.122757.1@evax01.d51.lilly.com> From: ga19989@evax01.d51.lilly.com Date: 18 Jan 96 12:27:57 EST References: <4dkpo5$l5g@news-2.csn.net> Distribution: world Nntp-Posting-Host: evax01.d51.lilly.com Lines: 24 In article <4dkpo5$l5g@news-2.csn.net>, Bill Kleronomos writes: > So, to summarize my REAL question! At an elevation of 50 or 60 feet, how well might a one to two > wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 160 meters? Would > ground losses and reflections negate the benefits of using this type of antenna at a low height in > terms of wavelength? Anyone tried same? > > Bill, KD0HG > Lyons, Colo. It's been decades (really) since I had a long wire, but (according to the ARRL antenna books of the day) a long wire or rhombic is not as sensitive to elevation as dipoles ... in fact, I was running a 250 footer at 25' with some pretty fair results.... the books were a little vague as to long wire and rhombic performance on 80 and 160, but I'd guess if there was space, give it a try.... be sure to point it where you want the signal to go, as it sure won't be omnidirectional.... mel KJ9C From lwbyppp@epix.net Mon Jan 22 19:53:57 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!hookup!gatech!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!news-2.csn.net!usenet From: Bill Kleronomos Newsgroups: rec.radio.amateur.antenna Subject: Rhombics at Low Heights? Date: 18 Jan 1996 06:35:49 GMT Organization: Supernet, Inc. Lines: 19 Message-ID: <4dkpo5$l5g@news-2.csn.net> NNTP-Posting-Host: 199.117.100.5 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) On the lower frequencies such as on 80 and 160, very low horizontally polarize d antennas work pretty poorly, even at relatively close distances where they ought to have a f air high angle of radiation-- Moxon's RSGB antenna book suggests that this is due to the earth a cting as a good lossy attenuator for an antenna in close proximity....The extreme case of this being a dipole lying on the ground. I'm looking for any insight as to whether a reasonably low long-wire antenna o r a variant (vee-beam, rhombic) would suffer from the effects of lossy earth as much as a simple dipole. In this case, the extreme example might be how well a Beverage might work out in transmitting, but I'm thinking in terms of 50 feet elevation or so. So, to summarize my REAL question! At an elevation of 50 or 60 feet, how well might a one to two wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 16 0 meters? Would ground losses and reflections negate the benefits of using this type of antenn a at a low height in terms of wavelength? Anyone tried same? Bill, KD0HG Lyons, Colo. From lwbyppp@epix.net Mon Jan 22 19:53:58 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!hookup!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!news-2.csn.net!usenet From: Bill Kleronomos Newsgroups: rec.radio.amateur.antenna Subject: Rhombics at Low Heights? Date: 18 Jan 1996 06:35:22 GMT Organization: Supernet, Inc. Lines: 19 Message-ID: <4dkpnb$kuk@news-2.csn.net> NNTP-Posting-Host: 199.117.100.5 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) On the lower frequencies such as on 80 and 160, very low horizontally polarize d antennas work pretty poorly, even at relatively close distances where they ought to have a f air high angle of radiation-- Moxon's RSGB antenna book suggests that this is due to the earth a cting as a good lossy attenuator for an antenna in close proximity....The extreme case of this being a dipole lying on the ground. I'm looking for any insight as to whether a reasonably low long-wire antenna o r a variant (vee-beam, rhombic) would suffer from the effects of lossy earth as much as a simple dipole. In this case, the extreme example might be how well a Beverage might work out in transmitting, but I'm thinking in terms of 50 feet elevation or so. So, to summarize my REAL question! At an elevation of 50 or 60 feet, how well might a one to two wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 16 0 meters? Would ground losses and reflections negate the benefits of using this type of antenn a at a low height in terms of wavelength? Anyone tried same? Bill, KD0HG Lyons, Colo. From lwbyppp@epix.net Mon Jan 22 19:53:59 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!psgrain!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Date: 18 Jan 1996 09:30:58 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 42 Sender: root@newsbf02.news.aol.com Message-ID: <4dllj2$bin@newsbf02.news.aol.com> References: <4dkpo5$l5g@news-2.csn.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4dkpo5$l5g@news-2.csn.net>, Bill Kleronomos writes: > >On the lower frequencies such as on 80 and 160, very low horizontally >polarized antennas work pretty poorly, even at relatively close distances where they >ought to have a fair high angle of radiation-- Moxon's RSGB antenna book suggests >that this is due to the earth acting as a good lossy attenuator for an antenna in close >proximity....The extreme case of this being a dipole lying on the ground. > >I'm looking for any insight as to whether a reasonably low long-wire antenna >or a variant (vee-beam, rhombic) would suffer from the effects of lossy earth as much >as a simple dipole. In this case, the extreme example might be how well a Beverage >might work out in transmitting, but I'm thinking in terms of 50 feet elevation or so. > >So, to summarize my REAL question! At an elevation of 50 or 60 feet, how >well might a one to two wavelength per leg rhombic or vee-beam be expected to >perform on 80 oand/or 160 meters? Would ground losses and reflections negate the >benefits of using this type of antenna at a low height in terms of wavelength? Anyone >tried same? Hi Bill, Data from others and my own experience confirms what you read in Moxon's article. In a Beverage seven feet above earth, I measured 6 dB of current loss at a distance of ~1 wavelength from the fedpoint. That indicates adding wire would make little or no improvement in performance. John Kueclin published data on V's and Rhombic taken from actual field tests. His data indicated LW antennas need to be 1/3 of their length above ground to minimize losses. Antennas longer than 3.3-3.9 wl (when 1.1-1.3 wl high) actually had a slight gain decrease in gain. Very long low wires do radiate on 160. When I compared 500 foot longwires at 100 feet to a 1/4 wl vertical on 160 the vertical always won. On 80 the longwire was a bit better (in the favored direction) than a vertical, but barely better. They were much better for receiving, just not transmitting. 73 Tom From lwbyppp@epix.net Mon Jan 22 19:54:00 1996 Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!swrinde!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Date: 19 Jan 1996 00:27:07 GMT Organization: Hewlett-Packard Lines: 27 Message-ID: <4dmogr$1g7@hpscit.sc.hp.com> References: <4dkpnb$kuk@news-2.csn.net> NNTP-Posting-Host: hpscrj.scd.hp.com In article <4dkpnb$kuk@news-2.csn.net>, Bill Kleronomos wrote: >On the lower frequencies such as on 80 and 160, very low horizontally polariz ed antennas work >pretty poorly, even at relatively close distances where they ought to have a fair high angle of > >So, to summarize my REAL question! At an elevation of 50 or 60 feet, how wel l might a one to two >wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 1 60 meters? Would >ground losses and reflections negate the benefits of using this type of anten na at a low height in >terms of wavelength? Anyone tried same? > >Bill, KD0HG >Lyons, Colo. FWIW: I used to have a full sized (130 feet long) 80 meter dipole at 55 feet. For distances up to 1000 miles, it was outstanding. Transmitting from Norther n Calif., I would often be told I was the loudest signal on the band in Southern Calif. or VE7, etc. For DX, it wasn't worth a tinker's damn. I was just barely able to work JA's on CW running a KW. I also put up a quarter wave vertical with 2 elevated quarter wave radials. Listening to DX signals, the two antennas we re virtually identical. However, the vertical was 10 to 15 dB. down vs the dipol e on the 1000 mile paths where I had gotten great reports on the dipole. I don't claim any great insight in antenna theory here; I am just relating my experiences. BTW, the dipole was end fed as a Zepp, but that's another dis cussion. Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Mon Jan 22 19:54:01 1996 Path: news.epix.net!news.sprintlink.net!sparky.midwest.net!usenet From: martya@ldd.net (Marty Albert) Newsgroups: rec.radio.amateur.antenna Subject: Re: Source of Al tubing? Date: Thu, 18 Jan 1996 05:36:27 GMT Organization: Midwest Internet Lines: 16 Message-ID: <4dkm3v$dpr@sparky.midwest.net> References: <30FC3749.ED3@lamar.colostate.edu> Reply-To: martya@ldd.net NNTP-Posting-Host: dial4-27.midwest.net X-Newsreader: Forte Free Agent 1.0.82 fiz wrote: >Hi, >I'm looking for a source of Al tubing to build some antennas. Any >suggestions? >ttfn fiz (KG0YG) Texas Towers in Plano, TX sells AL tube in many sizes. See details in QST/CQ/73 mags. Marty Albert (Amatuer Radio Station KC6UFM) Fredericktown, MO USA From lwbyppp@epix.net Mon Jan 22 19:54:02 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!ns.etri.re.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Tue, 16 Jan 96 21:51:25 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 13 Message-ID: References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> NNTP-Posting-Host: bos1b.delphi.com X-To: writes: >it exactly...... and Cecil, you must be the only one in the world that didn't >catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get Hi again Armond, there are at least three people who even thought my posting was serious. Hope to teach Sterba a lesson with that one. Some young, vulnerable, naive people don't know when he's kidding. What I did was assume the persona of Sterba and blasted Sterba just like Sterba would have. What goes around comes around. And Armond, an EDZ *is* a dipole - ask W7EL. :-) 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Mon Jan 22 19:54:03 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!usc!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 17 Jan 1996 10:40:46 GMT Organization: ELNEC/EZNEC Software Lines: 19 Message-ID: <4dijne$j5q@maureen.teleport.com> References: NNTP-Posting-Host: ip-pdx01-34.teleport.com ; Cecil Moore writes: ; writes: ; > doubling the power raises three dB. Well, one must raise the ; > voltage by six times to gain three dB." ; > ; Wonder what kind of calculator Sterba uses. Mine says if v2/v1=6 then ; that's almost 16 dB. ; 73, Cecil, KG7BK, OOTC He must have meant Sterbys, not dB. At 6 dB per Sterby, a voltage ratio of 6 is 2.59 Sterbys (Sterbies?), or 3 in round numbers. We all make mistakes. Roy Lewallen, W7EL, OF From lwbyppp@epix.net Mon Jan 22 19:54:04 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!uunet!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet From: armond@delphi.com Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Mon, 15 Jan 96 23:53:18 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 12 Message-ID: References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> NNTP-Posting-Host: bos1b.delphi.com X-To: Cecil Moore Cecil Moore writes: >hangs on two thirty foot supports like my 88 ft dipole. He hasn't come up Cecil: so you are back to thumping that drum again, huh, Ask W7EL and he will explain this to you. Your "dipole"is NOT a dipole. A dipole is two poles. :di" state and are creating more "poles" Your antenna has moved beyond that of a dipole , it is an EDZ or something. I threw away the message that was a relay to you so can not quote it exactly...... and Cecil, you must be the only one in the world that didn't catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get a copy of MAD magazine....pay someone to explain the gags to you. From lwbyppp@epix.net Mon Jan 22 19:54:05 1996 Path: news.epix.net!uunet!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 21 Jan 1996 18:06:34 GMT Organization: Intel Corporation, Chandler, AZ Lines: 22 Distribution: world Message-ID: <4dtvba$18ak@chnews.ch.intel.com> References: <4do8h9$hci@newsbf02.news.aol.com> NNTP-Posting-Host: vegas.ch.intel.com In article <4do8h9$hci@newsbf02.news.aol.com>, W8JI Tom wrote: > >Definition's I found indicate your dipole ANTENNA is a dipole ANTENNA on >every band where the antenna is "primarily" a broadside radiator. But the >def excludes that name where the antenna goes into a non-broadside primary >pattern mode. So my 88ft EDZ centerfed *is* a "dipole" on 20m because of the two broadside major nodes but not a "dipole" on 17m where it has a 4-lobbed clover-leaf pattern? The confusing part for me is during receive. The antenna doesn't know what frequency the receiver is tuned to or even if the receiver is powered up or not. How does it know whether to be a dipole or not during non-transmitting times? If I'm not home and you drive by my house, would you say I had a dipole or not? I can buy how using it during transmit can change its definition. I have trouble accepting that thinking about it can change its definition. If only that worked with girlfriends. :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Mon Jan 22 19:54:06 1996 Path: news.epix.net!news.sprintlink.net!news.ICSI.Net!news From: kjones@sun-link.com (Ken Jones & Martha McLemore) Newsgroups: rec.radio.amateur.antenna Subject: Re: tower install options? Date: Thu, 18 Jan 1996 02:53:00 GMT Organization: McLemore/Jones, Hanover PA USA Tel/Fax:717-633-1939 Lines: 19 Message-ID: <30fdb5aa.2776525@news.netrax.net> References: NNTP-Posting-Host: 205.231.169.55 X-Newsreader: Forte Agent .99c/16.141 Once upon a time, aa7wd@primenet.com (Chris Terwilliger) wrote: >I am thinking about installing a tower and wonder if the following idea has >any serious flaws... <> >Is this structurally sound? > >73 >Chris Terwilliger, AA7WD >aa7wd@primenet.com I think you'll find that Rohn's tilt-over base is built on this idea. Ask fer a catalog. They have some good engineering ideas. Cheers, Ken Jones (kjones@sun-link.com) [Amateur Radio callsign KB3JA] McLemore/Jones -- Hanover PA USA Tel/Fax +1-717-633-1939 From lwbyppp@epix.net Mon Jan 22 19:54:07 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.dpc.net!novia!nntp.inc.net!news.inc.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: n4jvp@ix.netcom.com (n4jvp) Newsgroups: rec.radio.amateur.antenna Subject: VK parasol in 73 Magazine(Oct 83) Date: Tue, 16 Jan 1996 17:21:21 GMT Organization: Netcom Lines: 8 Message-ID: <30fbdd64.1304855@ixnews2.ix.netcom.com> NNTP-Posting-Host: ix-nas-nh1-02.ix.netcom.com X-NETCOM-Date: Tue Jan 16 9:23:22 AM PST 1996 X-Newsreader: Forte Agent .99c/16.141 I am looking for a copy of the October 1983 issue of 73 Magazine. This issue had an article on constructing a VK parasol, an inexpensive 2 element wire beam. I have built several versions of this antenna but in my travels I have misplaced/lost that issue. I would like to build another but I need the fomulae from the article. I am looking for either a copy of that issue or a photocopy of the article. 73 de N4JVP/NH From lwbyppp@epix.net Mon Jan 22 19:54:08 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!van-bc!news.mindlink.net!news From: Jim_pestell@mindlink.bc.ca (jim pestell) Newsgroups: rec.radio.amateur.antenna Subject: wefax stations Date: Tue, 16 Jan 1996 09:20:24 GMT Organization: MIND LINK! - British Columbia, Canada Lines: 6 Message-ID: <4dfqmo$nha@fountain.mindlink.net> NNTP-Posting-Host: line045.nwm.mindlink.net X-Newsreader: Forte Free Agent 1.0.82 Just wondering if anyone knows of any good wefax stations and where to find them? Also other things that can be see with a fax program? thanks. From lwbyppp@epix.net Mon Jan 22 19:54:09 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news.cac.psu.edu!usenet From: John Passaneau Newsgroups: rec.radio.amateur.antenna Subject: Re: what is the theory behind the R- Date: Thu, 18 Jan 1996 08:18:04 -0800 Organization: Penn State University Lines: 20 Message-ID: <30FE72BC.7013@leps.phys.psu.edu> References: <4dkngk$qv4@oskgw.osk.sony.co.jp> NNTP-Posting-Host: thing-two.phys.psu.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win16; I) Peter Shintani wrote: > > Help > I would like to find out more of the theory of how the R-5 and R-7 a ntennas work. > I understand that they are half wave antennas, so that the input impedance i s > very high, so I assume that there is a 1:x ratio unun plus perhaps a balun > inside the black box. Ie, use a 1:4 or so unun to bring the input impedance of the > vertical+ radials acting as a vertical windom > down to 50 or so ohms, then use a balun to feed the coax. Is that correct ? > > Any technical info would be appreciated. > VE7CQA in JA land I talked to one of the guys that designed that antenna a Datyon Hamvention one year. He told me that they made the antenna slightly shorter than a 1/2 wave. This was to lower the impedance just a bit to make it easier to match. In the Black box is a matching unit to bring the impedace down to 50 ohms. This is followed by a 1 to 1 balun to prevent feedline radation. Its mostly straight foward stuff. John Passaneau, WB8EIY, State College Pa. From lwbyppp@epix.net Mon Jan 22 19:54:10 1996 Path: news.epix.net!news.sprintlink.net!news.Edu.TW!newsserver.jvnc.net!news.caren.net!news.join.ad.jp!wnoc-tyo-news!news.sinfony.ad.jp!sonygw2!oskgw!news From: Peter Shintani Newsgroups: rec.radio.amateur.antenna Subject: what is the theory behind the R- Date: 18 Jan 1996 05:57:40 GMT Organization: Sony Japan Lines: 12 Message-ID: <4dkngk$qv4@oskgw.osk.sony.co.jp> NNTP-Posting-Host: 43.2.3.17 Mime-Version: 1.0 Content-Type: text/plain; charset=iso-2022-jp Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.antenna Help I would like to find out more of the theory of how the R-5 and R-7 antennas w ork. I understand that they are half wave antennas, so that the input impedance is very high, so I assume that there is a 1:x ratio unun plus perhaps a balun inside the black box. Ie, use a 1:4 or so unun to bring the input impedance of the vertical+ radials acting as a vertical windom down to 50 or so ohms, then use a balun to feed the coax. Is that correct ? Any technical info would be appreciated. VE7CQA in JA land From lwbyppp@epix.net Mon Jan 22 19:54:11 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Listserv@ucsd (Mailing List Processor) Newsgroups: rec.radio.amateur.antenna Subject: Re: your LISTSERV request "help with beverage antenna made from slinkies" Date: 15 Jan 96 23:13:27 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601152313.PAA17975@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu The mailing list "with" could not be found. You may use the INDEX command to get a listing of available mailing lists. From lwbyppp@epix.net Mon Jan 22 19:54:12 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!news.sol.net!daily-planet.execpc.com!earth!whiteboy From: whiteboy@earth.execpc.com (Ryan Dunham) Newsgroups: rec.radio.amateur.antenna Subject: ~~~~ WHAT IS THE BEST GROUNDING SYSTEM? ~~~~ Date: 19 Jan 1996 19:53:57 GMT Organization: Exec-PC Lines: 5 Message-ID: <4dossl$kv1@daily-planet.execpc.com> NNTP-Posting-Host: earth.execpc.com X-Newsreader: TIN [version 1.2 PL2] I have a 3 ft tripod and a 5 ft mast on that and a antron99 on that and its on my roof, what is a cheap but effective way to ground it? E-mail me thanks From lwbyppp@epix.net Fri Jan 26 13:39:21 1996 Path: news.epix.net!uunet!in2.uu.net!news.texoma.com!usenet From: Gary Stone Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew. Subject: 72 ohm twin lead ?? Date: 21 Jan 1996 22:17:10 GMT Organization: Internet Texoma, Inc. Lines: 23 Message-ID: <4due16$h5i@venus.texoma.com> NNTP-Posting-Host: ppp109.texoma.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Greetings, My brother-n-law (KI7XQ) is trying to locate a source for a few feet of 72 ohm twin lead for an antenna project. I am not sure of the details of the project, but I believe he needs only about 3 feet. He is making a balun from the twin lead and the plans call for 72 ohm. Any ideas? Please e-mail with any response, as I cannot always have access to the usenets. Thanks and 73, Gary (N5PHT) -- /\__/\ Gary and Karen Stone (Gary N5PHT) 0 0 E-Mail: garystone@texoma.com @ or karenstone@texoma.com (_/\_) Http://home.texoma.com/personal/garystone/ ~~ From lwbyppp@epix.net Fri Jan 26 13:39:22 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!swrinde!news.uh.edu!lurch.sccsi.com!news.sccsi.com!tattoo.sccsi.com!nuchat!ganymede From: ganymede@newpop.sccsi.com (Greg R. Broderick) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew. Subject: Re: 72 ohm twin lead ?? Date: Mon, 22 Jan 96 05:53:35 GMT Organization: The UseNet global cabal Lines: 25 Message-ID: <4dv8ov$g0_002@tattoo.sccsi.com> References: <4due16$h5i@venus.texoma.com> NNTP-Posting-Host: tty25.com2.houston.net X-Newsreader: News Xpress Version 1.0 Beta #4 In article <4due16$h5i@venus.texoma.com>, Gary Stone wrote: >Greetings, > >My brother-n-law (KI7XQ) is trying to locate a source for a few feet of >72 ohm twin lead for an antenna project. I am not sure of the details of >the project, but I believe he needs only about 3 feet. He is making a >balun from the twin lead and the plans call for 72 ohm. Somebody please correct me if I'm incorrect, but I believe that zip cord has a characteristic impedance of 72 ohms. [posted and emailed] Greg R. Broderick (no call sign yet) -- ============================================================================ Greg R. Broderick And it came to pass that in the hands of the ignorant, the words of the Bible were used to beat plowshares into swords. greg@qrd.org -- Alan Watts ganymede@sccsi.com 70142.620@compuserve.com ============================================================================ From lwbyppp@epix.net Fri Jan 26 13:39:23 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet From: Tom Pfaffenbach Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew. Subject: Re: 72 ohm twin lead ?? Date: 24 Jan 1996 18:26:40 GMT Organization: Delco Electronics Lines: 9 Distribution: usa Message-ID: <4e5tl0$otg@kocrsv08.delcoelect.com> References: <4due16$h5i@venus.texoma.com> <4dv8ov$g0_002@tattoo.sccsi.com> NNTP-Posting-Host: koprpc05.delcoelect.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (Windows; I; 16bit) To: ganymede@newpop.sccsi.com I tested several brands of zip cord recently with a Tektronix time-domain refl ectometer. I started with some really nice looking clear insulation oxygen-free copper spea ker cord that Sam's Club was selling for $8.50/100ft. My thought was to run balanced feed fr om a toroid balun and keep the balun accessible, rather than 60ft in the air. All brands measure d between 100 and 123 ohms. Apparently modern diameters and line spacing have made the 72 ohm ru le of thumb obsolete! 73 K9JDU From lwbyppp@epix.net Fri Jan 26 13:39:24 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!newsserv.freeway.net!dave From: dave@freeway.net (Dave Wright) Newsgroups: rec.radio.amateur.antenna Subject: 88 ft dipole antenna. Was: Re: Sterba again Date: 21 Jan 1996 05:17:23 GMT Organization: "Freeway (TM) - America's Public Information Network" Lines: 23 Message-ID: <4dsi93$9p5@onramp.freeway.net> References: <4d2h90$7fm@ender.techcenter.paccar.com> <4d5cv9$8uq@newsbf02.news.aol.com> NNTP-Posting-Host: onramp.freeway.net X-Newsreader: NN version 6.5.0 #9 (NOV) armond@delphi.com writes: >Cecil Moore writes: > >>hangs on two thirty foot supports like my 88 ft dipole. He hasn't come up > >Cecil: so you are back to thumping that drum again, huh, Ask W7EL and he will >explain this to you. Your "dipole"is NOT a dipole. A dipole is two poles. > :di" state and are creating >more "poles" Your antenna has moved beyond that of a dipole , it is an EDZ or >something. I threw away the message that was a relay to you so can not quote An "88 ft dipole" is a correct discription of Cecil's antenna. It describes t he physical properties; two 44 ft conductors with a center feed point. Armond, i f you said that you had a "5/2 wavelength dipole" then that would not be correct because you are then describing the electrial properties, not physical. Armond, is my 120 ft, 80m monopole a dipole? hmmmmmm dave -- david wright - n8it dave@freeway.net From lwbyppp@epix.net Fri Jan 26 13:39:25 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!news.columbia.edu!sol.ctr.columbia.edu!spool.mu.edu!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet From: a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) Newsgroups: rec.radio.amateur.antenna Subject: Re: ?impedance of longwire? Date: Tue, 23 Jan 1996 17:13:23 GMT Organization: Regional Computing Center, University of Cologne Lines: 15 Message-ID: <4e34va$fsc@news.rrz.uni-koeln.de> References: <4dg7m7$f2i@news.rrz.uni-koeln.de> <4dqdho$h8i@ixnews7.ix.netcom.com> NNTP-Posting-Host: annexr2-6.slip.uni-koeln.de X-Newsreader: Forte Free Agent 1.0.82 stubstad@ix.netcom.com(Jim Stubstad ) wrote: Thanks for the advice, jim, however thats what i knew allready. I was interested in HOW (!!!) high the capacitance would be. thats what they do not say in the books! what about the real parts ? are they low ? and if how low ? 1 ohm, five or 1000? what changes if fed in the middle ? I have done exactly as you proposed and fed it allright, but it would be necessary to predict the behavier in advance to setting the thing up. if you can provide more details, i would be thankfull 73 thilo dl9kce From lwbyppp@epix.net Fri Jan 26 13:39:26 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet From: a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) Newsgroups: rec.radio.amateur.antenna Subject: Re: ?impedance of longwire? Date: Thu, 25 Jan 1996 01:04:39 GMT Organization: Regional Computing Center, University of Cologne Lines: 5 Message-ID: <4e6ktc$fje@news.rrz.uni-koeln.de> References: <4dg7m7$f2i@news.rrz.uni-koeln.de> <4dqdho$h8i@ixnews7.ix.netcom.com> <4e34va$fsc@news.rrz.uni-koeln.de> NNTP-Posting-Host: annexr2-9.slip.uni-koeln.de X-Newsreader: Forte Free Agent 1.0.82 Thanks to all who helped me. Question was answerd sufficiently. 73 thilo From lwbyppp@epix.net Fri Jan 26 13:39:27 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!news-relay.us.dell.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.antenna Subject: angle of ground plane radials???? Date: 23 Jan 96 13:38:00 GMT Organization: ucsd usenet gateway Lines: 19 Message-ID: <01I0CDS9B336000LN2@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu charlie@netdepot.com (Charlie Fortner) wrote: >I've seen plans for 2m using a SO-239 and some copper rods. The >instructions say to bend the rods at a 45 degree angle towards the >ground. I've seen commercially made 2m antennas that don't have bent >radials. What does the angle of the radials do for the signal? The feedpoint impedance of a groundplane with horizontal radials is around 36 ohms. In order to get an impedance of 50 ohms you need to bend the radials down about 45 degrees. This reduces the capacitive reactance a bit. If you need to have the radials at horizontal you can compensate for this be reducing the length of the radiator by about 5 percent. This has the same effect of reducing the capacitive reactance a bit. Kevin, WB5RUE muenzlerk@uthscsa.edu From lwbyppp@epix.net Fri Jan 26 13:39:28 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!haven.umd.edu!ames!lll-winken.llnl.gov!sol.ctr.columbia.edu!news.mindlink.net!uniserve!usenet From: Jeff Newsgroups: rec.radio.amateur.antenna Subject: Re: apartment Ant. Date: 20 Jan 1996 23:22:30 GMT Organization: UNIServe Online Lines: 4 Distribution: world Message-ID: <4drtfm$qv0@atlas.uniserve.com> NNTP-Posting-Host: van0119.tvs.net I know a ham in Ontario Canada that has been using an Antron 99 antenna laying horizontal on his balcony. It works great. He talks all over the world with it. But it won`t help on the lower bands. The Antron is good from 14 through 28 megs. From lwbyppp@epix.net Fri Jan 26 13:39:29 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!sierra.net!imci3!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!ames!waikato!auckland.ac.nz!news From: Mitchell Rodda Newsgroups: rec.radio.amateur.antenna Subject: Best HF Vertical Antenna? Date: 24 Jan 1996 23:35:07 GMT Organization: School of Engineering, University of Auckland Lines: 23 Message-ID: <4e6fnb$rkg@net.auckland.ac.nz> NNTP-Posting-Host: ead-64-33.ead.auckland.ac.nz Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: mjr@auckland.ac.nz Hi Folks, The amateur radio club here at the university is thinking of putting up a vertical HF antenna. We were wondering what the best brands were and if any one model or brand was particularly (un)effective or easy (hard) to tune. Ideally we want coverage of all bands from 80-10m though 80 could be sacrificed if necessary. We hear a lot about the G5RV design - what is it? Are they available in commercial kits? Any info appreciated. If you have an HF vertical please let me know your experiences with it - ewven if only briefly. T.I.A., Mitchell Rodda (ZL1BAT or mjr@auckland.ac.nz) Secretary - Auckland University Amateur Radio Club. From lwbyppp@epix.net Fri Jan 26 13:39:30 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!usenet From: Joe Fitter BV/N0IAT Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna Subject: Re: CB to Ham Transformation. Date: 26 Jan 1996 06:23:08 GMT Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C. Lines: 22 Message-ID: <4e9s0c$lbj@tilde.csc.ti.com> References: <4e8bj0$qoe@reader2.ix.netcom.com> <4e8nji$hob@newsbf02.news.aol.com> <4e9rsj$lbj@tilde.csc.ti.com> NNTP-Posting-Host: 137.167.36.115 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.misc:97248 rec.radio.amateur.antenna:18657 Anyone out here in Rec.Radio land able to help Alex? How about anyone in the NYC area? Please email to the below address, not the one in the top of this message (it was posted elsewhere). Thanks in advance to any elmer who helps. Joe ---------------------------------------- alex948739@aol.com (Alex948739) wrote: The reason I did not get my licence is because I am only 15. When I have time to study and learn stuff, I will get a licence. I was wondering, can you transform portable CB radio that I have from GE to Ham? How did you transformed it?Is it a good ham or a bad ham? Also, on cb since i live in NY i hear alot of spanish itallian people speaking in other languages on most channels and there is alot of profanity. I am wondering is there anythink like that on HAm? Please send me plans on how to transform. Thank You ------------------------------------------ From lwbyppp@epix.net Fri Jan 26 13:39:31 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!bigboote.WPI.EDU!news3.near.net!news.ner.bbnplanet.net!llnews.ll.mit.edu!usenet From: jataylor@ll.mit.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: Cell phone antenna plans? Date: Thu, 18 Jan 1996 10:40:18 Organization: MIT Lincoln Laboratory Lines: 22 Message-ID: References: <4d9ms3$nbs@post.acadia.net> X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] >Can anyone tell me how to build an high-gain cellular telephone antenna >for my cabin, that will allow me to have reliable communications in a >very marginal service area? Right now, I am getting less than one bar >(of a possible four) on my car-mounted antenna. With such a poor signal >I can't get voice calls out very well, let-alone fax/data modem calls. >Please e-mail if you know/are willing to offer advice. Jeffrey, You might look at the article "Portable Helix for 435 MHz," in ARRL Antenna Book (16th edition, p. 19-30). You'd want to scale most dimensions down by a factor of about 2, for the antenna to operate properly at cellular frequencies. Although this antenna provides circular polarization rather than linear vertical, I think you'd find it fairly forgiving to precision of construction. My guess that a good antenna that's pointed correctly at the nearest cellular tower will indeed allow you to work when you should be relaxing! John Taylor, V73JT Kwajalein Atoll From lwbyppp@epix.net Fri Jan 26 13:39:32 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!newshost.comco.com!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: CQ: All HF remote base users.............. Date: 23 Jan 1996 05:26:39 GMT Organization: Texas A&M University, College Station, TX Lines: 39 Message-ID: <4e1rif$p14@news.tamu.edu> References: <4dttam$otu@news.aros.net> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In <4dttam$otu@news.aros.net>, mfp@aros.net (MFP - KB7YJJ) writes: >Attention all other REMOTE HF group operators: > >We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller) >at our rptr site...... > >I would be very happy to hear what antennas you guys are using... > >We tried an R7 and it was noisy, BUT would snap under our icing - >windloading at our site..... > >Our next bet might be a dipole... > >how bought the Gap Challenger 80-6 meter antenna, any more rugged or >less-rugged than the R&!!! > Probably the most reliable single pole multiband vertical antenna is the old and expensive Hy-Gain - AVQ deal. It is a stub segment multi-band job that goes in a nice safe block of concrete. It has a feed line at the base that ca n take advantage of a nice safe set of radials at ground level to be used for a really needed lightning p[rotection scheme. Your feed line goes away from it, assuming you are smart, at or below ground level. It will come away from the tower into a nice safe single point entry into the remote base hut, if you are also smart. At about 60 feet hight it is no stick it in the ground and jump start the pony deal, but, the years will go by. You rig will be as safe as you could ask, assuming the proper lightning protection has been done at the hut end and you will be thankful you didn't try a loading coil version of anything. If you are lucky, you may be even able to go up to the top of it with a neat little 440 beam towar the direction of an RF control link ito the site and, with a little padding of the feed to the tower and the feed line inside the deal, get your link up high enough to be line of site to the control point. Mike W5WQN as a guest at leviathan.tamu.edu From lwbyppp@epix.net Fri Jan 26 13:39:33 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!news.dfn.de!scsing.switch.ch!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!gatech!usenet.eel.ufl.edu!freenet2.freenet.ufl.edu!afn17891 From: "Thomas W. Castle" Newsgroups: rec.radio.amateur.antenna Subject: Re: CQ: All HF remote base users.............. Date: Tue, 23 Jan 1996 01:11:37 -0500 Lines: 32 Message-ID: References: <4dttam$otu@news.aros.net> NNTP-Posting-Host: freenet2.afn.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: afn17891@freenet2.freenet.ufl.edu In-Reply-To: <4dttam$otu@news.aros.net> On 21 Jan 1996, MFP - KB7YJJ wrote: > Attention all other REMOTE HF group operators: > We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller) > at our rptr site...... > I would be very happy to hear what antennas you guys are using... > > Our next bet might be a dipole... > Not sure on how far your trying to spread the freq; but how about a multi-band trapped antenna mounted in a vertical manor with fiberglass stand-offs at 3 points...? We used this method a year ago on field day an it worked pretty good. It was mounted using 3 fiberglass poles <2 1/2" dia. by 8' long>, one at the top half end, one at the center and 1 at the bottom end. I believe the antenna was a B&W 10 - 80 mtr band trapped antenna. Even without readjusting any of the traps or lengths, we were able to use the tuner of a Kenwood TS50 an matching tuner and get a acceptable SWR. We Were Able to work all the bands of the antenna, with less than 1.5 SWR. Bear in mind that the antenna was previously tuned an set up, elseware in a conventional manner and had been tweaked in at "that" time. If nothing else its simple to try an someone in your group may have an antenna to work with to try it out...? BTW> have you considered the AEA Isoloop Antenna.? Hope this helps De Tom From lwbyppp@epix.net Fri Jan 26 13:39:34 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Chris Boone <72732.2610@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna Subject: Re: CQ: All HF remote base users.............. Date: 22 Jan 1996 01:06:04 GMT Organization: ENTERGY/Gulf States Utilities Lines: 24 Message-ID: <4dunts$gqk$1@mhade.production.compuserve.com> References: <4dttam$otu@news.aros.net> I am using the following set up on my HF remote base: Kenwood TS680 with allmode squelch mod ACC SM100 Shackmaster Full duplex 420 Mhz link to my rptr site 5 miles south and also have dial up via the SM100 phone line Full wave 80 m loop with apex at 100ft and bottom at 20ft off ground (in triangle shape) fed with 75 ohm coax at top of apex. Works great on all bands from 80-10 and even 6! (SWR looks good anyway)....hope to put a 160 mtr full wave loop up and then use a 10mtr and 6 mtr verticals for those bands (with relay switching handling the selection).....next on the list is a TS690s (the rcvr in the 680 stinks sometimes!) 73 Chris -- Senior Telecommunications Technician 72732.2610@CompuServe.com ENTERGY/Gulf States Utilities 1:106/4267 FIDOnet WB5ITT - Advanced Class BBS- 409-447-4267 (WBBS) PG-9-5322 FCC Commercial 409-525-2001 PhoneMail 24hr From lwbyppp@epix.net Fri Jan 26 13:39:35 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!netnews.upenn.edu!dsinc!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!usc!news.service.uci.edu!usenet From: dbwillia@uci.edu (Brian Williams) Newsgroups: rec.radio.amateur.antenna Subject: Re: Crossbanding antenna Dip or Duplexer? Date: 19 Jan 1996 23:29:04 GMT Organization: UCI Medical Center Lines: 20 Message-ID: <4dp9g0$rdo@news.service.uci.edu> References: <4deq69$2tcr@ns4-1.CC.Lehigh.EDU> NNTP-Posting-Host: dialin9125.slip.uci.edu Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 In article <4deq69$2tcr@ns4-1.CC.Lehigh.EDU>, c002@Lehigh.EDU says... > >Hello, i would like to run my dual band rig crossbanding into ONE antenna >now, do i need to get one of those small duplexers for 30-40$ or >a multi hundred cavitiy? >thanks >David David, Duplexors are not required when on different bands, and in fact, the small duplexors that I think you're speaking of would require you to use two of them (at the dual band antenna and at the radio). That would involve more losses and expense than it is worth. If you're not running a power amplifier, your radio has enough isolation built in to use it for crossbanding. Be careful of tone encoding and decoding or use DTMF coding to prevent other signals from tripping your radio. Brian N6ZAU From lwbyppp@epix.net Fri Jan 26 13:39:37 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!news.uni-mainz.de!news.th-darmstadt.de!uni-erlangen.de!rznews.rrze.uni-erlangen.de!news From: Richard Hieber Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: European archive site? Date: 25 Jan 1996 16:00:42 GMT Organization: RRZE Lines: 21 Message-ID: <4e89fa$41o@rznews.rrze.uni-erlangen.de> NNTP-Posting-Host: miraculix.rrze.uni-erlangen.de Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.antenna:18654 rec.radio.amateur.homebrew:12921 Hi all, as I tend to use my Usenet browser quite unregulary, I'd prefer to retrieve the traffic of the last few months or so at an archive site. I know the official archive site of r.r.a.antenna and of r.r.a.homebrew somewhere at a stateside location, but the slowness of my access takes the fun out of it. I'd like to know an archive site for the rec.radio.amateur.* newsgroups somewhere in Europe. I don't need an FTP site for programms or stuff, just archived Usenet traffic. Do you know any, over here in the Old World? Vy 73, Richard -- Richard Hieber, DL8MFQ/AA8CP EMAIL: Richard.Hieber@rrze.uni-erlangen.de From lwbyppp@epix.net Fri Jan 26 13:39:37 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Y.K.Chan <76742.13@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna Subject: Re: Extremely narrow-band antennas? Date: 22 Jan 1996 01:07:56 GMT Organization: CompuServe, Inc. (1-800-689-0736) Lines: 26 Message-ID: <4duo1c$su8$1@mhadg.production.compuserve.com> References: <4d729b$qp@hpscit.sc.hp.com> Hi Paul, I am a bit confused with your comments and wonder if you can help me understand some of the details. /I disagree with the part about the efficiency going down. Can you elaborate the term efficiency use in here. /The radiation resistance does go down. That makes it more /challenging to keep the ohmic losses low. I cannot agree with you more.:-) /An indication of low efficiency in a small antenna is bandwidth (what bandwidth?) that is larger than expected (expected what bandwidth?). /In the case of the orginal poster, he wanted a low bandwidth. /So he has good reason to do everything possible to have high /efficiency. Can you give us examples for high efficiency? YK -- Y.K.Chan B.C.Canada 76742.13@Compuserve.com From lwbyppp@epix.net Fri Jan 26 13:39:38 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!howland.reston.ans.net!usc!newshub.csu.net!ssu-2en173.sonoma.edu!user From: butler@sonoma.edu (Bob Butler) Newsgroups: rec.radio.amateur.antenna Subject: Feed Line - Ethernet Coax Date: Tue, 23 Jan 1996 18:12:52 -0800 Organization: Sonoma State University, Information Technology Lines: 12 Message-ID: NNTP-Posting-Host: ssu-2en173.sonoma.edu I think this has been discussed in the past, but does anyone know how well IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line compared to something like RG-8U? Are they fairly comparable as far as signal loss goes in the 2m band? It definitely has to be better the RG-58U I'm using now, which is about 5db loss/100' @ 146mhz. Thanks for any info or comments. -Bob KE6EHO -- From lwbyppp@epix.net Fri Jan 26 13:39:39 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!usenet From: John Passaneau Newsgroups: rec.radio.amateur.antenna Subject: Re: Feed Line - Ethernet Coax Date: Wed, 24 Jan 1996 09:51:27 -0800 Organization: Penn State University Lines: 15 Message-ID: <3106719F.6DA7@leps.phys.psu.edu> References: NNTP-Posting-Host: thing-two.phys.psu.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win16; I) To: Bob Butler Bob Butler wrote: > > I think this has been discussed in the past, but does anyone know how well > IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line > compared to something like RG-8U? Are they fairly comparable as far as sign al > loss goes in the 2m band? It definitely has to be better the RG-58U I'm > using now, which is about 5db loss/100' @ 146mhz. Thanks for any info or > comments. > > -Bob > KE6EHO > > -- > Its the same as RG-8 type cable, just a different jacket. John Passaneau, WB8EIY, State College Pa. From lwbyppp@epix.net Fri Jan 26 13:39:40 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail From: n7tcf@primenet.com Newsgroups: rec.radio.amateur.antenna Subject: Re: Feed Line - Ethernet Coax Date: 26 Jan 1996 06:03:01 -0700 Organization: Primenet Services for the Internet Lines: 10 Sender: root@primenet.com Message-ID: <4eaje5$mbp@nnrp1.news.primenet.com> References: Reply-To: n7tcf@primenet.com X-Posted-By: ip089.phx.primenet.com X-Newsreader: IBM NewsReader/2 v1.2.5 Take a sample and compare it with some good quality coax. I used to work in commercial office buildings as building operator. I supervi sed tenant improvments and had access to all the salvage coax I wanted. The bad news is the 50 stuff often had only token shielding. I would guess about 50%! I did aquire a couple hundred feet of RG-62 (~100 ohms) which I hav e used for impeadance transforms. Look for brand names, plenum-grade has a fire-resistant jacket. None have uv protection. Jim N7TCF From lwbyppp@epix.net Fri Jan 26 13:39:41 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netnews From: stubstad@ix.netcom.com(Jim Stubstad ) Newsgroups: rec.radio.amateur.antenna Subject: Re: G-Line Feeders Date: 21 Jan 1996 01:01:11 GMT Organization: Netcom Lines: 31 Message-ID: <4ds38n$dn7@ixnews8.ix.netcom.com> References: <4dop1b$ei8@sparky.midwest.net> NNTP-Posting-Host: ix-sj21-13.ix.netcom.com X-NETCOM-Date: Sat Jan 20 5:01:11 PM PST 1996 In blanton@ni.net (J. L. Blanton) writes: > >In article <4dop1b$ei8@sparky.midwest.net>, martya@ldd.net wrote: > >> I have for years read little tid-bits about the G-Line feeder. This a >> single wire, very low loss (even at SHF+) feeder system developed by >> some fellow whose last name starts (started? it has been around a long >> time) with G. ... > >One limitation of G-line is that it doesn't tolerate sharp bends very well >or close proximity to other objects (especially metallic ones). > >Lee, WA8YBT/6 I agree, the launchers are a bitch, and even the droop of the wire can be a problem, to be serious you need tensioned rods or solid copperclad steel, plain copper creeps, and stranded increases losses. My vote is for open wire line, it tolerates all but sharp bends, and it is easier to transition to. I'd rather build a balanced line with half the loss by using more air, less plastic between to minimize dielectric and wet dirt losses, and bigger wires spaced farther apart to minimize skin effect losses than build launchers and align G line. If it's really microwave, you should have an up/down converter or at least a PA/LNA up at the antenna feed with a coax drop anyway. The (french?) inventor was named Gobau, hence "Gobau line." Jim From lwbyppp@epix.net Fri Jan 26 13:39:42 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: Jeff Blumenfeld KB3DX Newsgroups: rec.radio.amateur.antenna Subject: GAP Titan Date: Mon, 22 Jan 1996 15:36:20 +0000 Organization: CompuServe Incorporated Lines: 3 Message-ID: <3103AEF4.4023@aol.com> NNTP-Posting-Host: hd57-006.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4 (Macintosh; I; 68K) I have an R5, which is great, and just purchase a GAP Titan (still in the box) because I wanted 40 and 80. What does anyone think about the GAP? Should I buy an R7 instead? From lwbyppp@epix.net Fri Jan 26 13:39:43 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!wave.news.pipex.net!pipex!soap.news.pipex.net!pipex!usenet From: M Biddiscombe Newsgroups: rec.radio.amateur.antenna Subject: GAP Titan DX Vertical Antenna Date: 22 Jan 1996 21:35:59 GMT Organization: UnipalmPIPEX server (post doesn't reflect views of UnipalmPIPEX) Lines: 3 Message-ID: <4e0vvv$g8c@soap.news.pipex.net> NNTP-Posting-Host: an088.du.pipex.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (Windows; I; 16bit) Can anyone please advise me on the best method of mounting the GAP Titan antenna eg, at ground level or on a mounting pole? From lwbyppp@epix.net Fri Jan 26 13:39:43 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: Jeff Blumenfeld KB3DX Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Vertical Antenna Date: Tue, 23 Jan 1996 13:55:17 +0000 Organization: CompuServe Incorporated Lines: 5 Message-ID: <3104E8C5.1290@aol.com> References: <4e0vvv$g8c@soap.news.pipex.net> NNTP-Posting-Host: hd25-040.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4 (Macintosh; I; 68K) I just bought one of those myself, but haven't put it up yet, due to the weather. The GAP folks (as I guess you know) say you can mount it either about 8' off the ground on a metal pipe, or at rooftop, with no difference in performance. I'd be interested in hearing your experience with its performance. From lwbyppp@epix.net Fri Jan 26 13:39:45 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lille1.fr!ciril.fr!news.imag.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: Jeff Blumenfeld KB3DX Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Vertical Antenna Date: Wed, 24 Jan 1996 10:34:38 +0000 Organization: CompuServe Incorporated Lines: 83 Message-ID: <31060B3E.DA2@aol.com> References: <4e0vvv$g8c@soap.news.pipex.net> <3104E8C5.1290@aol.com> NNTP-Posting-Host: hd78-139.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4 (Macintosh; I; 68K) Subj: Re: GAP Titan DX Vertical Antenna Date: Wed, Jan 24, 1996 4:32 AM EDT From: pmarkham@sun.lssu.edu X-From: pmarkham@sun.lssu.edu (Peter C. Markham) To: jeffreyblu@aol.com >I just bought one of those myself, but haven't put it up yet, due to >the weather. The GAP folks (as I guess you know) say you can mount >it either about 8' off the ground on a metal pipe, or at rooftop, >with no difference in performance. I'd be interested in hearing >your experience with its performance. I made the mistake of purchasing the Titan, after seeing it at the Dayton, 94 hamfest. I mounted it on a the roof of a single story wood frame building with the counterpoise? 36" above the peak of the roof, 22 ft. above ground. I used my FT-890, the Titan switched direct, and the 80m dipole, straight, at 33ft with balanced feed switched through an MFJ-949B tuner, for the following observations. Only on 40m did it perform better than my 80m dipole at 33ft, at low angles, < 10 degrees, in most directions. 40m at >10 degrees it was consistently down in all directions except a small sector off the ends of the dipole, where it was 1 to 2 S units better. On 30m it was down by 2 S units, compared to the dipole in the directions of least difference between the two antennas. On 7, 14, 18, 21, 24 and 28 mhz it was down > 1/2 S unit at all az and el angles with very few exceptions. On 80m the performance was down 1 to 2 S units, in general, but given the antenna's space requirements and physical length, I consider its performance acceptable. I used an MFJ-202 noise bridge to get an idea of ant Q, resonance and band width. On 30m the resonance was 400khz high. On the other bands, it was sufficiently close that operating environment/assembly, may have been responsible for the errors noted. The Q was quite high and narrow on the high end of 80m, exactly where it should have been for the capacitor used and required on that band. As a general observation the other bands had an antenna Q quite low and broad, which troubled me, bringing to mind the characteristics of a dummy load. In the Fall of 94, a front passed through with winds gusting 50 to 60 mph for a full day. The antenna was bent over some 20 degrees in a gentle curve in the area a few feet above the "counterpoise". The decoupling/tuning rods were all askew because of the twisting force generated when the antenna flexes in the wind. I then removed the antenna from the roof, disassembled it, straightened it, reassembled it and mounted it on a mast in the backyard with the counterpoise 8 ft off the ground. I guyed it with 125 lb test nylon net twine, in 90 degree directions just above the "gap". No mechanical problems, since. No noticeable difference in performance, of any consequence, was noted in its new location. During the Summer of 95, a friend brought over, at my request, a high rent, new, Hewlett Packard spectrum analyzer and tracking generator, with which we swept the antenna from 3 to 30 mhz. The results were very consistent with what I had determined with the noise generator, and in general, confirmed my suspicions that the antenna did have bandwidth, resonance and Q characteristics that came dangerously close, on most bands, to emulating those of a dummy load. No signal checks were made in transmit because I can in no way determine the validity of a "signal report" I touched bases with GAP personel on 3 occaisions, over a period of the first 18 months, and was in general, informed that my observations were probably a consequence of operating environment. I submit that the same characteristics exhibited by the antenna at 2 different locations is probably a consequence of design, barring some subtle assembly mistake I made, assembling the antenna twice, with meticulous care, by the book. I accept that my empirical methods may not hold up under the scrutiny of perfectionists. I have no doubt of the general differences in operating characteristics of the 2 antennas compared. I have no doubt about the general antenna characteristics observed with the noise bridge and spectrum analyzer. I have made my way through life as a generally competent electronic technician who thinks about what he does, and despises wild a-- guesses. For the better part of the last 9 months, I have been using it with a Comet duplexer as an BCB/SW antenna for listening only, and as a 2 meter antenna for local work. SWR on 146 is 1.6:1 Yes, I have buyer's remorse. :-) Pete, wa4hei From lwbyppp@epix.net Fri Jan 26 13:39:47 1996 Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!howland.reston.ans.net!nntp.crl.com!crl7.crl.com!not-for-mail From: theinric@crl.com (Tim Heinrichs) Newsgroups: rec.radio.amateur.antenna Subject: Glen 326G for sale Date: 21 Jan 1996 15:17:14 -0800 Organization: CRL Dialup Internet Access (415) 705-6060 [Login: guest] Lines: 82 Message-ID: <4duhhq$2qt@crl7.crl.com> NNTP-Posting-Host: crl7.crl.com X-Newsreader: TIN [version 1.2 PL2] GREEN SHEET from theinric@crl.com For Sale: Glen 326-G Digital Controller manufactured by Glen Manufacturing in Stockton, CA "Congratulations, you have just purchased a very unique and precision instrument. This unit contains a VFO, Digital Computer, Frequency Counter, and a 5 digit LED display. Its function is to generate a stable variable frequency, compute and display the resultant transmit or receive frequency. Technical Specifications: VFO Frequency Range--7 to 25 MHz on fundamentals, 14 to 50 MHz on 2nd harmonic. Tuning Ratio---------10 : 1 vernier on Coarse, and Fine controls. 500 KHz may be tuned on any band. High/Low switch------Shifts any selected frequency up 400 KHz, allowing coverage of any band of 900 KHz. Display--------------MC or KC gives a choice of either 1KHz, or .1KHz resolution on display. Accuracy-------------1KHz in MC position, .1KHz in KC position. Counter Range--------5KHz to 50MHz, fully programmable on 5 digits. X1 or X2 multiplier for harmonics. Power, Base model----117 Volts AC @ .1 Amps @ 60 Hz Power, Mobile model--10 to 20 Volts DC negative or positive gnd. Either lead may be reversed with out regard to polarity. Note: Novice band, business band, or citizen band is not permitted the use of a VFO to transmit with. Only crystal controlled transmissions are authorized by the FCC on these bands. If the purpose of the VFO is to monitor the various bands previously mentioned, and a transceiver is used, then the transmitter should be dis-abled or the microphone removed to prevent the possibility of transmitting. Face description: Has five digit readout High/Low switch Fine tune pot Coarse tune pot on/stby switch on/off power switch Back description: KC/MC display switch X2/X1 multiplier switch frequency set adjustment 1/2/3/4/5/6 band selector switch asking $150.00 all offers considered email for more information---- Tim Heinrichs Marietta, Georgia U.S.A. Internet: theinric@crl.com If you would like to be put on my mailing list, send email. I periodically send out green sheets on mainly electronics, new and used, several unusual items. From lwbyppp@epix.net Fri Jan 26 13:39:47 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!s81.phxslip4.indirect.com!tracker From: tracker@indirect.com (Mark Saunders) Newsgroups: rec.radio.amateur.antenna Subject: GPS antenna designs needed Date: Mon, 22 Jan 1996 18:34:35 UNDEFINED Organization: Amateur Radio Station KJ7BS Lines: 9 Message-ID: References: NNTP-Posting-Host: s81.phxslip4.indirect.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1] Hello and thanks for reading this message. Does anyone have antenna designs for a GPS receiver, Garman 45 to be specific? From lwbyppp@epix.net Fri Jan 26 13:39:48 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!s81.phxslip4.indirect.com!tracker From: tracker@indirect.com (Mark Saunders) Newsgroups: rec.radio.amateur.antenna Subject: GPS antenna designs needed Date: Mon, 22 Jan 1996 18:24:24 UNDEFINED Organization: Amateur Radio Station KJ7BS Lines: 5 Message-ID: NNTP-Posting-Host: s81.phxslip4.indirect.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1] Hello and thanks for reading this message. Does anyone have antenna designs for a GPS receiver, Garman 45 to be specific? From lwbyppp@epix.net Fri Jan 26 13:39:49 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!News.MO.NET!opus.anet-stl.com!news.anet-dfw.com!imci2!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.hol.gr!news From: Douglas Braun Newsgroups: rec.radio.amateur.antenna Subject: Re: GPS antenna designs needed Date: 23 Jan 1996 08:09:34 GMT Organization: Hellas On-Line Lines: 8 Message-ID: <4e253u$ebp@newsflash.hol.gr> References: NNTP-Posting-Host: dbraun@slip1.hol.gr Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; Linux 1.1.76 i586) To: tracker@indirect.com X-URL: news:tracker.27.0054DA31@indirect.com I've been looking for a couple of years for a GPS auxillary antenna project, and the best I've seen was a patch antenna in last October's QST. It was a very good article, but I haven't had a change to build it... Douig Braun SV/N1OWU From lwbyppp@epix.net Fri Jan 26 13:39:50 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!freenet3.freenet.ufl.edu!afn17891 From: "Thomas W. Castle" Newsgroups: rec.radio.amateur.antenna Subject: Ground Radials...? Date: Thu, 25 Jan 1996 02:34:42 -0500 Lines: 40 Message-ID: NNTP-Posting-Host: freenet3.afn.org Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: afn17891@freenet3.freenet.ufl.edu Hi Tom here: I am sure this subject has been gone over here, many times before; but I am just now getting into Vertical Antennas'... I would like to take an area that I have, 150' x 150' that is in the clear; an put a Vertical antenna in the center of it. The center of this strip of land is about 100' from the back of my Ham shack. There are no trees' or anything in this area period... I have read that the more radials you use the better... I have also been told to put multiple radials in the same trench. The figures I was given was 33', 65' & 130': splitting those figures in half at the intersecting point of 9 sets of these. At the intersecting point they would be cut an soldered to a 6" ring on copper wire, which would be positioned symmetrically around a 1 & 1/2" pipe mounted in the ground, that would hold your vertical antenna. This would give you a total of 27 wires attached to the ring; which in turn would be used to connect to your antenna. I was also told to put grounding rods at the end of each wire and bond them together. To me this seems like over kill...? Not to mention a lot of digging. I can see the idea of using part of a wave length to figure in the ground wire length. The Question is : Do you need to figure them for 20, 40 & 80 like that for each band? If so how about 15 & 10 mtrs as well? Not to mention the WARC bands..? The type of vertical I want to use is Cushcraft, Butternut or whatever; I just want to put down the best, most effective & most reasonable ground system that I can... "I only want to do it "once"..... I would like to keep it simple, if at all possible..? I want to put up either a 5 or a 8 band vertical. What type an size of one "Size Fits All" ground system should I build? I live in N. Fla. an have reasonabley good soil conditions. Had friend from F.P.L. check the ground conductivity with a "Meggar". A 20' ground rod gave a .5 ohm ground <1" solid brass rod x 20'>... Thanks ahead of time for any assistance, on this project of mine... De KD4QHH a.k.a. Tom. From lwbyppp@epix.net Fri Jan 26 13:39:52 1996 Path: news.epix.net!uunet!in1.uu.net!tcsi.tcs.com!agate!holonet!colossus.holonet.net!woodybbs!1-106-4267-0!chris.boone From: Chris.Boone@f4267.n106.z1.fidonet.org (Chris Boone) Date: 20 Jan 96 07:56:33 Newsgroups: rec.radio.amateur.antenna Subject: HELP:What did I buy?? Message-ID: X-FTN-To: Dan Sitterley Organization: WoodyWare Software, Inc. Lines: 37 5*** Quoting Dan Sitterley to All dated 01-17-96 *** > From: Dan Sitterley > Subject: HELP:What did I buy?? > Organization: Galaxy Star - Northeastern Oklahoma Internet > > I recently purchased 5 sections of what I thought was ROHN 45 tower > only > to find out that it is smaller than ROHN 45 (which has an 18" face) and > > larger than ROHN 25 (which has a 12" face). This tower has a 15" face > and > has the same Z bracing as ROHN. I took a section to our club meeting > and > no-one had seen anything like it. I need to find a top section for it > and > don't know where to start looking. I believe that the legs are 1.25" in > > diameter and is made of very heavy zinc coated metal. > > Any help would be appeciated. > sounds like what you got is the Motorola special....ROHN makes a special size for the Big M inbetween 25 and 45....(they MAY call it 35 but Ive never seen it in the ROHN catalogs)... Call ROHN and ask them.... 73 Chris WB5ITT -- |Fidonet: Chris Boone 1:106/4267 |Internet: Chris.Boone@f4267.n106.z1.fidonet.org | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:39:53 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.bu.edu!news3.near.net!bigboote.WPI.EDU!news.ultranet.com!zombie.ncsc.mil!admaix.sunydutchess.edu!ub!news.kei.com!newsfeed.internetmci.com!in2.uu.net!ncrgw2.ncr.com!ncrhub6!daynews!ranger!cn2935.DaytonOH.attgis.COM!john.ackermann From: john.ackermann@daytonOH.ncr.com (John Ackermann) Subject: Re: HELP:What did I buy?? X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com Message-ID: Lines: 16 Sender: news@ranger.daytonoh.attgis.com (News Administrative Login) Organization: AT&T Global Information Solutions X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7] References: <30FDC772.3F44@galstar.com> Date: Thu, 18 Jan 1996 10:03:22 GMT In article <30FDC772.3F44@galstar.com> Dan Sitterley wri tes: >I recently purchased 5 sections of what I thought was ROHN 45 tower only >to find out that it is smaller than ROHN 45 (which has an 18" face) and >larger than ROHN 25 (which has a 12" face). This tower has a 15" face and >has the same Z bracing as ROHN. I took a section to our club meeting and >no-one had seen anything like it. I need to find a top section for it and >don't know where to start looking. I believe that the legs are 1.25" in >diameter and is made of very heavy zinc coated metal. Going from an old recollection here, but I think that Motorola used to sell a tower that was manufactured for them by Rohn, and that was intermediate in size between 25G and 45G -- it may even have been called 35G. John AG9V From lwbyppp@epix.net Fri Jan 26 13:39:54 1996 Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news From: lenrev@wwa.com (Len Revelle) Newsgroups: rec.radio.amateur.antenna Subject: Re: HELP:What did I buy?? Date: Wed, 24 Jan 1996 04:03:05 GMT Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com) Lines: 27 Message-ID: <4e4b7j$8d@kirin.wwa.com> References: <30FDC772.3F44@galstar.com> NNTP-Posting-Host: vh2-001.wwa.com X-Newsreader: Forte Free Agent 1.0.82 john.ackermann@daytonOH.ncr.com (John Ackermann) wrote: >In article <30FDC772.3F44@galstar.com> Dan Sitterley wr ites: >>I recently purchased 5 sections of what I thought was ROHN 45 tower only >>to find out that it is smaller than ROHN 45 (which has an 18" face) and >>larger than ROHN 25 (which has a 12" face). This tower has a 15" face and >>has the same Z bracing as ROHN. I took a section to our club meeting and >>no-one had seen anything like it. I need to find a top section for it and >>don't know where to start looking. I believe that the legs are 1.25" in >>diameter and is made of very heavy zinc coated metal. >Going from an old recollection here, but I think that Motorola used to sell a >tower that was manufactured for them by Rohn, and that was intermediate in >size between 25G and 45G -- it may even have been called 35G. >John AG9V I used to have a tower similar in diminsions to Rohn 25G but was made in Racine, Wisc.. It was made by a "Universal Tower Company" which was not the aluninum tower people. This one was only 1/2" or so wider than 25G and had vertically oriented bolts going thru angle steel welded to the outside of the tower legs. The may have made a larger version as well. From lwbyppp@epix.net Fri Jan 26 13:39:56 1996 Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!news.orst.edu!news.PEAK.ORG!billn From: billn@PEAK.ORG (Bill Nelson) Newsgroups: rec.radio.amateur.antenna Subject: Re: HF DF antenna Date: 22 Jan 1996 08:06:42 GMT Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA Lines: 9 Message-ID: <4dvgii$bsf@odo.PEAK.ORG> References: <4dub5j$r5e@irk.zetnet.co.uk> NNTP-Posting-Host: peak.org X-Newsreader: TIN [version 1.2 PL2] Laurence Jamieson (laurence.jamieson@zetnet.co.uk) wrote: : Does anybody know where I can find details on HF direction finding : antennae? I am looking for any information, e.g. ready made hardware, : designs, books containing the theory, sources of any of these. I don't know about recent Radio Amateur's Handbooks, but those of the 70s contained DF information and construction details. Bill From lwbyppp@epix.net Fri Jan 26 13:39:57 1996 Path: news.epix.net!uunet!in1.uu.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!zetnet.co.uk!usenet From: laurence.jamieson@zetnet.co.uk (Laurence Jamieson) Newsgroups: rec.radio.amateur.antenna Subject: HF DF antenna Date: Sun, 21 Jan 1996 21:37:23 GMT Lines: 12 Message-ID: <4dub5j$r5e@irk.zetnet.co.uk> NNTP-Posting-Host: foula.zetnet.co.uk Does anybody know where I can find details on HF direction finding antennae? I am looking for any information, e.g. ready made hardware, designs, books containing the theory, sources of any of these. Thanks in advance -- Laurence Jamieson laurence.jamieson@zetnet.co.uk Shetland Islands Scotland U.K. From lwbyppp@epix.net Fri Jan 26 13:39:58 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!news2.net99.net!news.cais.net!news.supernet.net!news.cyberport.com!news.chatlink.com!news.internetMCI.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!uknet!florence.scotnet.co.uk!usenet From: GW0ACH@lordjohn.celtic.co.uk (Lord John) Newsgroups: rec.radio.amateur.antenna Subject: Hygain TH7DX Mast Clamp and Parts needed? Date: Sun, 21 Jan 1996 21:43:31 GMT Organization: The Scottish Internet Supplier Lines: 9 Message-ID: <4dub0e$12t@florence.scotnet.co.uk> NNTP-Posting-Host: dynamic33-hobbit.celtic.co.uk X-Newsreader: Forte Free Agent 1.0.82 My TH7DX is in need of repair and with the Spring drawing near I am looking for a source of parts. In particular I need a boom to mast clamp. Do you have any idea of the cost? Many thank de LordJohn GW0ACH From lwbyppp@epix.net Fri Jan 26 13:39:58 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!ind-008-237-73 From: mai@iquest.net (Patrick Croft) Subject: Re: Hygain TH7DX Mast Clamp and Parts needed? X-Nntp-Posting-Host: ind-008-237-73.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: <4dub0e$12t@florence.scotnet.co.uk> Date: Tue, 23 Jan 1996 15:36:31 GMT Lines: 16 GW0ACH@lordjohn.celtic.co.uk (Lord John) wrote: >My TH7DX is in need of repair and with the Spring drawing near I am >looking for a source of parts. In particular I need a boom to mast >clamp. Do you have any idea of the cost? > >Many thank > >de LordJohn >GW0ACH > HyGain sells these items and will accept charge cards. The pricing will not b e cheap. ($50+ range I think) You may wish to post a want to buy note to source someone p[arting out a yagi with the parts you need . Buty replacement STAINLESS STEEL bolts and associated hardware local - MUCH ch eaper than HyGain! Shipping to GW land will be a little hassle, but UPS and FedEx gets packages t here everyday. 73 Patrick WB9IQI From lwbyppp@epix.net Fri Jan 26 13:39:59 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news.utdallas.edu!news.starnet.net!wupost!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.antenna Subject: Re: J-Pole calculations Date: Sun, 21 Jan 1996 18:21:39 GMT Organization: Inlink Lines: 18 Message-ID: <4du0fn$46s@news1.inlink.com> References: <4djhhn$5lv@uudell.us.dell.com> NNTP-Posting-Host: slip86.inlink.com X-Newsreader: Forte Free Agent 1.0.82 jscott@maroon.us.dell.com (John Scott) wrote: >Does anybody know where I could get the actual calculations needed for >J-Pole design. I am interested in playing around with different >diameters of pipe etc. >Thanks ahead of time Check out my web page, K-Factoring charts and several J-Pole designs already calculated for you. To change pipe sizes, just change the K-Factor multiplier for the pipe diameter. http://www.inlink.com/~raiar TTUL - 73+ de Gary - KG0ZP From lwbyppp@epix.net Fri Jan 26 13:40:00 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: J-Pole gain Date: 22 Jan 1996 17:59:02 GMT Organization: Hewlett Packard Corvallis Site Lines: 31 Message-ID: <4e0j96$50g@hpcvsnz.cv.hp.com> References: <31011b48.745661@news.calon.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Edward Lewis (elewis@dsp.com) wrote: : I would like to know what the gain of a 2 meter j-pole would be, also : is a j-pole dirrectional, and if so to what side. I recently I'll choose to disagree slightly with Roy's post on this one... The simulations I've done indicate that, because of antenna current on the 1/4 wave matching section, the gain is slightly less than that of a simple half-wave in the same place as the half-wave part of the J-Pole. It's a fraction of a dB. This was true for freespace as well as for a-few-feet- above-ground simulations. On the other hand, end-feeding a half-wave against four quarter-wave radials resulted in a fraction of a dB _more_ gain than a center-fed half-wave... I'd say in practice none of this matters compared to other factors. Roy's comment about decoupling the feedline is important, and it is ALSO important to not simply attach the J-pole to a mast, if you want to know about your pattern. That is, if the mast, including the length of the quarter wave matching section, is resonant on your operating frequency, the small antenna current at the top of the matching section can become a much larger current odd quarter waves down the mast. Similarly, the simulations indicated that the J-Pole is slightly directional in the horizontal plane, but it's a small fraction of a dB with the matching-section dimensions that hams typically use. If the matching section is, for example, 1" diameter pipe on 3" centers, the effect will be greater than if it's twinlead with 1/2" spacing. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Fri Jan 26 13:40:01 1996 Path: news.epix.net!news.sprintlink.net!news.cwi.net!localhost.hkt.net!ibridge.iohk.com!news.hklink.net!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!news.wco.com!news From: elewis@dsp.com (Edward Lewis) Newsgroups: rec.radio.amateur.antenna Subject: J-Pole gain Date: Sat, 20 Jan 1996 16:51:13 GMT Organization: West Coast Online's News Server - Not responsible for content Lines: 8 Message-ID: <31011b48.745661@news.calon.com> NNTP-Posting-Host: dsp228.dsp.com X-Newsreader: Forte Agent .99c/16.141 I would like to know what the gain of a 2 meter j-pole would be, also is a j-pole dirrectional, and if so to what side. I recently constructed a 2 meter j-pole with much help from readers of the newsgroup, and it seems to work very well. I optamized the frequency to our local aprs frequency 145.010 mhz by cutting the antenna 1/4 inch shorter than my plans. Than I added couplers to the ends and adjusted the lenth for the lowest swr which was 1.1. 73 From lwbyppp@epix.net Fri Jan 26 13:40:03 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!wetware!wsrcc.com!news.orst.edu!news.PEAK.ORG!billn From: billn@PEAK.ORG (Bill Nelson) Newsgroups: rec.radio.amateur.antenna Subject: Re: Looking for info on legal cases involving commercial antenna-tower construction Date: 26 Jan 1996 05:24:35 GMT Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA Lines: 15 Distribution: world Message-ID: <4e9oij$83i@odo.PEAK.ORG> References: <4dk20l$e0a@news.milwaukee.tec.wi.us> <4dq9b5$qja@ray.atw.fullfeed.com> NNTP-Posting-Host: peak.org X-Newsreader: TIN [version 1.2 PL2] bigd@mail.atw.fullfeed.com wrote: : I may be wrong, but I don't think it's under local jurisdiction. : If you get approval from the FCC and the FAA, that's all you need, : unless they are trying to claim a zoning problem. Check with the : FCC office in Washington D.C. on this. Nope. The FCC has ruled that local government must make "reasonable allowances" for antennas. The ruling dealt with Amateur Radio Stations, if I remember correctly. However, they did not say that local agencies had no say - not the "reasonable". Basically, it means that antennas cannot be prohibited by local governments - but they can still limit the size of the antennas and towers. Bill From lwbyppp@epix.net Fri Jan 26 13:40:04 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!news From: dborders@holli.com (Doug Borders) Subject: loop antenna again X-Nntp-Posting-Host: rus-ts0-26.holli.com Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Internet, Inc. X-Newsreader: Forte Free Agent 1.0.82 Date: Tue, 23 Jan 1996 07:35:24 GMT Lines: 32 At the request of the one response I have gotten so far I will give more detail as to why I am using a loop antenna. I need the radiation pattern characteristics of the loop so that I will be able to tell when a car crosses the start/finish line. My plan is to have a transmitter in each car that is transmitting a carrier frequency of 49.9 MHz. This carrier is then modulated with a different frequency for each car(ie. car #1=1KHz, car #2=2KHz, etc.) The loop antenna would then be placed under the surface of the track at the start/finish line. The start/finish line would bisect the center of the loop. Using this technique the antenna would pick up the signal as it passes the first edge of the loop, the signal would then null out at the center of the loop and then rise again as it passes over the other edge. By using circuitry I would be able to detect this null point and thus have the exact time when the car passes the line!!!! This project at this point is not trying to go to production with all of the bugs worked out, but instead just trying to prove this idea would work on a small scale. Any help on constructing loop antennas(material, size to receive 49MHz, equations, etc.) would be much appreciated. Don't hold back, tell me what you think!!!! later, Doug Borders From lwbyppp@epix.net Fri Jan 26 13:40:05 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.antenna Subject: Re: Loop Antenna Question Date: Mon, 22 Jan 1996 21:16:29 -0600 Organization: Olivet Nazarene University Lines: 51 Message-ID: References: NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Doug; loop can be made of any kind of wire, copper preffered, the larger formule for a single turn, untuned loop is 1005/freq in mhz=feet, for your application, assuming you desire a fairly limited range (15-20 feet or so), I would use a small, (6in diam or so) multi-turn loop tuned to resonance with a plain old air variable capacitor (100pf or so), however, these smaal loops are rather directional (bi-directional). Hop I have been helpful. Mike KF8ZN On Mon, 22 Jan 1996, Doug Borders wrote: > > Hello, > > I am looking for any information on how to build a loop antenna that > can receive 49.9MHz. I am working on my senior design project and am > building a timing and scoring system for race cars that will use this > loop antenna to receive signals transmitted from each car. I used > 49.9 MHz because of the availability of transmitter and receiver IC's > for this frequency. > > My question is what should I make it out of? > > How big should it be? > > Are there simple equations to figure out the size vs. frequency? > > Should I just construct a loop and then tune it with a capacitor or > varactor diode? > > What is the best way to construct a loop? What size wire? Should I > use coil dope or somthing to mash the turns together? > > How does the number of turns in a loop change it's characteristics? > > Are loops generally wide ban receiving antennas? > > I know, I know....too many questions right? I am not a big RF guy > and am trying to find the best way to get this section of the project > done. Any help would be greatly appreciated. If anyone has any help > please e-mail me at dborders@holli.com. I don't frequent this board > very often and don't want to miss out on good information. > > Thanks!!!! > > Doug Borders > > > From lwbyppp@epix.net Fri Jan 26 13:40:06 1996 Path: news.epix.net!news.sprintlink.net!castle.nando.net!news From: geo@nando.net (George McCrary) Newsgroups: rec.radio.amateur.antenna Subject: Material for Vertical Date: Tue, 23 Jan 1996 22:07:30 GMT Organization: News & Observer Public Access Lines: 16 Message-ID: <4e3m7m$gcg@castle.nando.net> NNTP-Posting-Host: grail1015.nando.net X-Newsreader: Forte Agent .99a.107 Hello, I'm planning on consturcting a 40M 1/4 wave vertical in the woods behind my house. I have a wire vertical already and would like to make this one self-supporting (or at least not supported from above). Any suggestions for materials? Aluminium tubing is available in 6 foot lengths and can be nested. What would the minimum size to use be? What about TV mast? Conduit? Any suggestions would be appreciated. 73 DE KQ4QM (George) Please E-mail direct, my news server misses a lot of posts! From lwbyppp@epix.net Fri Jan 26 13:40:07 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!usenet From: Joe Fitter BV/N0IAT Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: 26 Jan 1996 06:36:52 GMT Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C. Lines: 25 Message-ID: <4e9sq4$lbj@tilde.csc.ti.com> References: <4dbe97$gnt@crusher.ici.net> <4dkpgd$8cc@kodak.rdcs.Kodak.COM> <1197cc$112a1c.14@luzskru.cpcnet.com> NNTP-Posting-Host: 137.167.36.115 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Saw this post on the MFJ analyzers and couldn't resist a comment! I've had one of the original models (MFJ-247 comes to mind). It has the built in freq counter, covers 160 thru 10 meters etc. I have found this little gadget to be the absolute most worthwile $150 investment in my ham radio career. I use it ALL the time. I originally bought it to help tune up a bugcatcher mobile antenna. After using it about a half dozen times the first time I had it out of the box, I realized MFJ had a winner here. I guess the new models are even "fancier". I enjoy antenna experimenting and it's really neat to try some different wire configurations and get a quick and easy "swr curve" chart, know the rough Q of the system, and know other possible points of resonance (or near resonance). It is also useful when testing runs of coax cable, and even decent as a signal generator. Only disappointment is that the input RF required to get the freq counter to measure an over-the-air signal is too high. Some kind of preamp is needed to boost sensitivity for over-air readings. regards, Joe BV/N0IAT in Taipei TAIWAN From lwbyppp@epix.net Fri Jan 26 13:40:08 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in1.uu.net!world!blanket.mitre.org!linus.mitre.org!usenet From: Al Wong Newsgroups: rec.radio.amateur.antenna Subject: need info: 5/8 wave 2m/70cm antenna Date: 23 Jan 1996 21:47:00 GMT Organization: The MITRE Corp. Lines: 13 Message-ID: <4e3l0k$pri@linus.mitre.org> NNTP-Posting-Host: m24837-pc.mitre.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 32bit) Has anyone any recommendations for a good 5/8 wave 2m/70cm mobile antenna? Only one stumping block....The car is corvette, thus mag/trunk mounts are out of the picture. Is my only other choice a window mount antenna? 73, DE NF4GDD From lwbyppp@epix.net Fri Jan 26 13:40:09 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: jastorm@ix.netcom.com (Jim Storm) Newsgroups: rec.radio.amateur.antenna Subject: Re: need info: 5/8 wave 2m/70cm antenna Date: Thu, 25 Jan 1996 08:58:37 GMT Organization: ix.netcom.com Lines: 21 Message-ID: <4e7gnr$ab0@ixnews7.ix.netcom.com> References: <4e3l0k$pri@linus.mitre.org> NNTP-Posting-Host: ix-smx-ca1-02.ix.netcom.com X-NETCOM-Date: Thu Jan 25 12:58:35 AM PST 1996 X-Newsreader: Forte Free Agent 1.0.82 Al Wong wrote: >Has anyone any recommendations for a good 5/8 wave 2m/70cm >mobile antenna? >Only one stumping block....The car is corvette, thus mag/trunk >mounts are out of the picture. >Is my only other choice a window mount antenna? >73, DE NF4GDD I use the Larsen glass mount and it works quite well. The Larsen has a very large footprint which makes for good coupling and Physical strength. 73, Jim WB6LWS From lwbyppp@epix.net Fri Jan 26 13:40:09 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.service.uci.edu!usenet From: dbwillia@uci.edu (Brian Williams) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need mod for GE Masterpro (repeater) Date: 19 Jan 1996 23:34:10 GMT Organization: UCI Medical Center Lines: 9 Message-ID: <4dp9pi$rdo@news.service.uci.edu> References: <4dhv21$f9l@nnrp1.news.primenet.com> NNTP-Posting-Host: dialin9125.slip.uci.edu Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 In article <4dhv21$f9l@nnrp1.news.primenet.com>, stanl@primenet.com says... > >I am looking for any mods regarding the GE Masterpro. I have schematics for the GE MASTRII but not for the Masterpro. I am looking for mods for it. If I locate Masterpro schematics, I'll let you know. Brian N6ZAU From lwbyppp@epix.net Fri Jan 26 13:40:11 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need V-Beam advice Date: 20 Jan 1996 07:09:17 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 29 Sender: root@newsbf02.news.aol.com Message-ID: <4dqm1d$jcp@newsbf02.news.aol.com> References: <4dp24d$rp8@spectator.cris.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Bob, In article <4dp24d$rp8@spectator.cris.com>, bratcher@cris.com (Robert M. Bratcher Jr.) writes: >I'm thinking about replacing my 2 Rhombics next summer with a pair of >V-beams of the same length as the Rhombics one a quarter wavelength >behind the other with ladder line between them. I know they become >unidirectional depending on which antenna the feedline hooks up to. >Should I just change the feed at the antenna manually or can I run >feedline from both antennas into the shack without affecting >directivity? Here's where you may have difficulty. The phase must be shifted the proper amount and the power properly distributed to each antenna to get a good uni-directional pattern. The length of the antennas and feedlines complicates this. The idea works well on paper, but is a real hassle in the world. I can suggest some methods to use if you want to use this method. The second method is to run the antennas exactly 180 degrees out of phase. This relaxes some of the problems, but not all of them. If you use this method, feed the antennas with a common short section of open wire line. Each conductor of that short line should connect to opposite feedpoint sides of each V. Connect the feeder from the house to the exact middle of that line. The pattern will be sorta bi-directional, losses in the antenna will make the pattern favor the direction away from the feedpoint by a few dB. From lwbyppp@epix.net Fri Jan 26 13:40:12 1996 Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!hookup!nntp-hub2.barrnet.net!pacbell.com!gw2.att.com!gw1.att.com!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!NewsWatcher!user From: hbaker@netcom.com (Henry Baker) Subject: Re: New Book about TESLA Message-ID: Sender: hbaker@netcom10.netcom.com Organization: nil organization References: <96020.132745U60082@uicvm.uic.edu> Date: Sun, 21 Jan 1996 02:12:38 GMT Lines: 25 Xref: news.epix.net rec.radio.amateur.digital.misc:13729 rec.radio.amateur.antenna:18622 In article <96020.132745U60082@uicvm.uic.edu>, wrote: > We have translated the book: Tesla's Correspondence with Relatives in > ENGLESH. It contains more than 200 pages and we recommend that it gets > wide distribution in the scholastic community and elsewhere. It contains > a Preface by Dr. A.S. Marincic, Introduction by Dr. Nenad V. Mandich, > Tesla's relative and translated by Nicholas Kosanovich. > > TESLA MEMORIAL SOCIETY, Inc. http://www.neuronet.pitt.edu/~bogdan/tesla > 453 Martin Road > Lackawanna, NY 14218 http://www.eskimo.com/~billb/tesla/telsa.html ^^^ This looks interesting, but you'll probably get more visitors if you spell the URL correctly: http://www.eskimo.com/~billb/tesla/tesla.html ^^^ -- www/ftp directory: ftp://ftp.netcom.com/pub/hb/hbaker/home.html Copyright (c) 1996 by Henry G. Baker. All rights reserved. ** Warning: Due to its censorship, CompuServe and its subscribers ** ** are expressly prohibited from storing or copying this document ** ** in any form. ** From lwbyppp@epix.net Fri Jan 26 13:40:13 1996 Path: news.epix.net!uunet!in1.uu.net!sunrise.gv.ssi1.com!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.antenna Subject: Re: PVC for Antennas Date: Sun, 21 Jan 1996 22:36:29 GMT Organization: RST Engineering Lines: 36 Message-ID: <4duf5n$jna@hg.oro.net> References: <4b9jgi$1gjs@msunews.cl.msu.edu> <4bc3e4$1kuk@usenetp1.news.prodigy.com> <4ceesi$fae@hg.oro.net> <4dbqne$dfj@hg.oro.net> <821696128snz@microvst.demon.co.uk> NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 "Anthony R. Gold" wrote: >In article <4dbqne$dfj@hg.oro.net> rst-engr@oro.net "Jim Weir" writes: >> > Are you saying that a material that passes the oven test >Do you have any example for a material which appears to be an >insulator to a VOM? An example of a near-perfect conductor may be >amusing but it is not a serious or useful answer to the question. [snip in consideration of bandwidth] I'm glad you have set yourself up as the arbiter of what is serious and useful. I was taught that useful was what pointed out something you didn't know and serious was anything you didn't do with a red bulb on your nose. Sure, how about carbon impregnated synthetic cloth (carbon fiber and the generic kevlar/carbon series). How about certain metallic paints and wet wood. Concrete with rebar in it. Bandwidth limits the rest of the examples. My original point, sir. You are using a VOM to measure, the other guy was using a microwave. Two ends of the RF spectrum -- DC and uW. Neither of which have a damned thing to do with what a material does at HF. If you're gonna use it at 30 MHz. MEASURE IT at 30 MHz.. Jim Jim Weir VP Engineering | "We seem to be standing on RST Engineering | the foreskin of technology." Grass Valley CA 95945 | (Gen. Chuck Yeager) voice/fax 916/272-1432 | rst-engr@oro.net AR Adv WB6BHI CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ From lwbyppp@epix.net Fri Jan 26 13:40:14 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: Q: HT antenna design Date: 26 Jan 1996 07:59:35 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 21 Message-ID: <4ea1l7$2854@info4.rus.uni-stuttgart.de> References: NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article , wrote: >Hello all! > >I would like to wind an antenna for an HT to be used at 446 MHz. My objectiv >is to make the antenna as short as possible. Jason, Many years ago, when I still thought that a HT is a usefull thing to have, I built such an "antenna" (for two meters). You take a plastic rod with the diameter of RG58 cable (I happned to have some teflon) drill from one end a 1 mm hole through the center 3/4" or so deep, and a hole from the side to meet the central bore. Than you feed a 7" (or longer) copper wire through the bore, solder a BNC center pin to one end and wind the other end round the rod. When you mount this thing in a BNC plug and enclose it in heat shrink you are done. Of course it helps to adjust the length and winding pitch with a SWR meter. 73, Moritz DL5UH From lwbyppp@epix.net Fri Jan 26 13:40:15 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!news1.isp.net!news.isp.net!news.slip.net!not-for-mail From: Ron Giuntini Newsgroups: rec.radio.amateur.antenna Subject: QRP Tuner Date: 25 Jan 1996 06:59:45 GMT Lines: 12 Message-ID: <4e79p1$odf@slip.net> NNTP-Posting-Host: sf-pm9-3.slip.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-NEWS-ADMIN: newsadmin@slip.net X-Mailer: Mozilla 1.2 (Windows; U; 16bit) Anyone have any suggestions on the best tuner for a 2 watt CW QRP rig? I am looking for something small, efficient and reasonable in price. I have looked at the MFJ catalogue but am unable to figure out which is best for this purpose. I would like to hear from any satisfied users. I have always been a little bit shy about using a tuner since my thought was that it would be another power robbing device in the line. Now that I am going to be using QRP power levels I am concerned about this even more. Does anyone think using one is a bad idea? Maybe some article in QST would solve my problem. I could build it if I knew which issue might have one in it. E mail me at rong@slip.net or reply here. Thanks for reading this message. From lwbyppp@epix.net Fri Jan 26 13:40:17 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!despina.neptune.com!news.jsums.edu!gatech!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!leon.d..zetekoff From: Leon.D..Zetekoff%1:2619/211.9 (Leon D. Zetekoff%1:2619/211.9) Date: 21 Jan 96 08:44:38 Newsgroups: rec.radio.amateur.antenna Subject: Re: R-7 problems Message-ID: Organization: WoodyWare Software, Inc. Lines: 46 To: Leon D. Zetekoff%1:2619/211.9%12:320/100.666 From: leonz@ibm.net (Leon D. Zetekoff) Subject: Re: R-7 problems Organization: Z&K Enterprises In message <4dtft7$3ccu@news-s01.ny.us.ibm.net> - leonz@ibm.net (Leon D. Zetek o ff) writes: :> :>I just recently put an R-7 up (after almost 10 years with a tower and beam. :>Because my counterpoise is only a few feet off my roof (which slopes) (it's :>also about 12 feet above the ground ona steel pipe) my SWR charts are all :>over the place. I faxed Cushcraft and they gave me some pointers. Anyone els e :>have any pointers on what to try when retuning the antenna? :> :>40m it seems to resonant way below the bottom edge of the band and even ther e :>is is 3.0:1; 15m seems to resonant above the top of the band; 20 resonants i n :>the CW band. 10m resonants around 28.9; the rest seem to resonant around the :>center of their band segments. On other item, I homebuilt a common mode choke to try and keep RF out. On 10m I can not run full power (100w using borrowed FT-890) as I get RF all over the place. Leon D. Zetekoff, N.C.E. Z&K Enterprises 1338 SW 3 Street Boca Raton, FL 33486 E-mail: leonz@ibm.net CompuServe: 74015,674 AMPRnet: wa4zlw@wa4zlw.#bcr.fl.us.na, wa4zlw@wa4zlw.ampr.org # Origin: Usenet:Z&K Enterprises (1:2619/211.9) # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666) -- |Fidonet: Leon D. Zetekoff%1:2619/211.9 2:301/249.666 |Internet: Leon.D..Zetekoff%1:2619/211.9 | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:40:17 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.cais.net!zippy.cais.net!news From: jsutton@erols.com Newsgroups: rec.radio.amateur.antenna Subject: Relays That Hum Date: 24 Jan 1996 23:28:54 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 10 Message-ID: <4e6fbm$j6v@zippy.cais.net> NNTP-Posting-Host: 205.252.17.229 X-Newsreader: SPRY News 3.03 (SPRY, Inc.) I have several 115 V AC relays that are at times produce an objectinal hum. D oes anyone have experience in opeating such relays on DC. The DC resistance is 75 to 85 ohms and the coil wire looks about # 28 to 30. Any comments for DC opeation - Voltage likely required - current required etc. Thanks Jim Sutton/AC4CZ jsutton@erols.com From lwbyppp@epix.net Fri Jan 26 13:40:18 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Date: 26 Jan 1996 00:06:15 GMT Organization: Intel Corporation, Chandler, AZ Lines: 12 Distribution: world Message-ID: <4e95tn$ima@chnews.ch.intel.com> References: <4dkpnb$kuk@news-2.csn.net> <4dmogr$1g7@hpscit.sc.hp.com> NNTP-Posting-Host: cmoore.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) rkarlqu@scd.hp.com (Richard Karlquist) wrote: >However, the vertical was 10 to 15 dB. down vs the dipole >on the 1000 mile paths where I had gotten great reports on the dipole. Hi Rick, I just picked up a college text on Electromagnetics by Joseph Edminis ter. Here's a quote: "As the monopole radiates power only in the region above the conducting plane, the total radiated power is one-half that of the correspondi ng dipole." Where does the power go? :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Fri Jan 26 13:40:19 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!Portugal.EU.net!news.rccn.net!scsing.switch.ch!news.rediris.es!power.ci.uv.es!usenet From: Esteban Sanchis Newsgroups: rec.radio.amateur.antenna Subject: Rotor Date: 26 Jan 1996 08:14:44 GMT Organization: Universitat de Valencia, Spain Lines: 14 Message-ID: <4ea2hk$jv7@power.ci.uv.es> NNTP-Posting-Host: dxer.eleinf.uv.es Hello to everybody Could somebody tell me how I have to choose the rotor for my antenna. The antenna I have bought is the TA-53M of Mosley. How do I know the torque I need an the braking torque I require. The fast formula I have used until know is: boomlength squared (ft) x weight (lb) x 0.03252 = torque (lb-in) or boomlength squared (ft) x weight (lb) x 0.03747 = torque (kg-cm) Does somebody know a beter formula and any foemula for the braking torque. 73' Stefan (EA5GMI) From lwbyppp@epix.net Fri Jan 26 13:40:20 1996 Path: news.epix.net!news.sprintlink.net!news.fast.net!dmarra.fast.net!user From: dmarra@fast.net (David M. Marra) Newsgroups: rec.radio.amateur.antenna Subject: Source for "Band Hopper" HF Mobile Ant.? Date: Thu, 25 Jan 1996 16:09:23 -0400 Organization: FASTNET(tm) PA/NJ/DE Internet Lines: 16 Message-ID: NNTP-Posting-Host: dmarra.fast.net Hi Everyone- Does anyone know the source of an HF mobile antenna called the Band-Hopper? It is a "screwdriver" design which has a built-in tuning mechanism to raise and lower the antenna based on transmit frequency. (This is what I was told from someone who has seen one.) Any information would be greatly appreciated! Thanks in advance! DAVE MARRA n3odx From lwbyppp@epix.net Fri Jan 26 13:40:21 1996 Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!purdue!yuma!usenet From: fiz Newsgroups: rec.radio.amateur.antenna Subject: Re: Source of Al tubing? Date: Thu, 18 Jan 1996 08:47:33 -0700 Organization: Colorado State University, Fort Collins, CO 80523 Lines: 29 Message-ID: <30FE6B95.3C43@lamar.colostate.edu> References: <30FC3749.ED3@lamar.colostate.edu> NNTP-Posting-Host: ts3311.slip.colostate.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Joe Mack wrote: > > In article ae517@FreeNet.Carleton.CA (Russ Renaud) writes: > > > >fiz (fiz@lamar.colostate.edu) writes: > >> Hi, > >> > >> I'm looking for a source of Al tubing to build some antennas. Any > >> suggestions? > >> > >> ttfn fiz (KG0YG) > > > > Dillsburg Aeroplane Works, Dillsburg PA, Charles Vogelsong propietor > (717)-432-4589. Very pleased with them. Remember if you want 12' This place is great. Thanks to all who recommended it. As it happens I not only want to build antennas, I want to build an airplane (full size) and didn't know about this company so it was a good lead there too. The tubing for a 12 element, 2 meter yagi (with lots of excess) is on its way :) Someone replying to this asked(?) whether there was a FAQ. I haven't seen one listed for a long time. Does anyone know where it is? Maybe its location should be posted now and then. BTW, I finally passed the 20 wpm code last night on the 4th try in 11 months. Already had credit for 4B that was due to expire 2/13 :) ttfn fiz (KG0YG) From lwbyppp@epix.net Fri Jan 26 13:40:23 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!psgrain!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: Sat, 20 Jan 96 12:36:31 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 12 Message-ID: References: <4cuduv$11g5@chnews.ch.intel.com> <4de25m$pgc@news1.seikotsi.com> <4dqjqv$2b0@ender.techcenter.paccar.com> NNTP-Posting-Host: bos1d.delphi.com X-To: Michael A. Sterba >Shouldn't one refer to author in these rags by their full pen name. I hate >getting tagged for sombody elses opinions since I am a real "Sterba". :) >KG7FU Sorry Michael, nothing personal, we're just nitpicking a nitpicker. He's right a lot but it wouldn't make sense to nitpick him when he's right. From now on let's everyone use KNSerba or KNS. 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Fri Jan 26 13:40:24 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!woodybbs!1-106-4267-0!chris.boone From: Chris.Boone@f4267.n106.z1.fidonet.org (Chris Boone) Date: 19 Jan 96 20:00:47 Newsgroups: rec.radio.amateur.antenna Subject: T2FD (Tilted Terminated Folded Dipole), any exp. ? Message-ID: X-FTN-To: Gert Carlsson Organization: WoodyWare Software, Inc. Lines: 38 5*** Quoting Gert Carlsson to All dated 01-16-96 *** > From: d91gerca@ida.liu.se (Gert Carlsson) > Subject: T2FD (Tilted Terminated Folded Dipole), any exp. ? > Organization: CIS Dept, Linkoping University, Sweden > > Does anybody have any experience with T2FD antennas? > I believe that Barker and Williamson makes a commercial version of this > antenna. > > I know that it is a compromise but I just don't have the space for more > than > one antenna. This antenna seems to be an interesting compromise. > > How do I feed it? I came across an article which suggested a 9:1 balun > and > coax feed. The terminating resistor should be around 390 Ohm in this > case. > So far, I have not been able to find a formula for calculating the > terminating > resistor. Does anyone know about this? I need an antenna that covers > 10-30 MHz The B&W antenna is a very compromised antenna....the balun is 16:1 not 9:1...the resistor "balance" section is 600 ohm non inductive.... Below 10 Mhz, the B&W antenna is outperformed by a 1/2wave dipole at the same freq as much as 10 db!!! 73 Chris WB5ITT (a B&W AC3-30 owner) -- |Fidonet: Chris Boone 1:106/4267 |Internet: Chris.Boone@f4267.n106.z1.fidonet.org | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:40:25 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!swrinde!sgigate.sgi.com!sgiblab!news.spies.com!genmagic!bug.rahul.net!a2i!kaiwan.kaiwan.com!not-for-mail From: alf@kaiwan.com (Alfred Lee) Newsgroups: rec.radio.amateur.antenna Subject: Testing co-axial filter Date: 24 Jan 1996 09:56:47 -0800 Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338) Lines: 23 Sender: alf@kaiwan009.kaiwan.com Message-ID: NNTP-Posting-Host: kaiwan009.kaiwan.com Greetings. Many hams living in the metropolitans are having inter-mod problem with outside antenna in the VHF and UHF bands. I am wondering if anyone has tried using filter made from l/4 lines to filter strong out of band signals. What I have in mind is to insert two open l/4 (electrical length) transmission line stubs in series to the centre conductor and the shield. Then parallel two shorted l/4 stubs from the centre conductor to the shield at both end of the first two stubs. I wonder what kind of insertion loss would result and what kind of attenuation can be achieved, say 154 MHz for 2 meter band. Also how may we test for insertion loss and attenuation using average hams' equipment. 73, --- Alfred Lee alf@kaiwan.co m KE6KGV 'The answer is (e^iă + 1) ? "No" : "Yes"' From lwbyppp@epix.net Fri Jan 26 13:40:26 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: gmfoster@cpcnet.com (Garry Foster) Subject: Transformer for Screwdriver type antenna Message-ID: <1187cc$62d0.2a9@luzskru.cpcnet.com> Date: Wed, 24 Jan 1996 11:47:41 GMT Reply-To: gmfoster@cpcnet.com X-Newsreader: Forte Free Agent 1.0.82 Lines: 9 I hear that Don Johnson and others are now recomending a matchinng transformer at the base of this antenna instead of the matching capicators. Does anyone have the details on this transformer. Just guessing I would assume about a 3-1 balun for 80 and 40. However it seems that would harm 20 through 10. Does any one have any ideas on this? Thanks Garry WB0NNO From lwbyppp@epix.net Fri Jan 26 13:40:27 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.pitt.edu!bb3.andrew.cmu.edu!casaba.srv.cs.cmu.edu!fore.com!forebarrel.fore.com!reh From: reh@fore.com (Russ Hoffman) Newsgroups: rec.radio.amateur.antenna Subject: Re: Transportable Antenna? Date: 22 Jan 1996 04:21:23 GMT Organization: FORE Systems, Inc. Lines: 32 Message-ID: <4dv3c3$1vh@shell.fore.com> References: <4dcicr$gm1@news.socketis.net> NNTP-Posting-Host: forebarrel.fore.com X-Newsreader: TIN [version 1.2 PL2] jmleveron (jmleveron@socketis.net) wrote: : I would like to get some opinions on a good, back-packable : (or readily vehicle transportable) omnidirectional and/or : dir. antenna for 2m. I constructed a 2m J-pole from 300 ohm twin-lead, housed inside a length of 3/4" O.D. PVC pipe. On each end, I cemented a threaded pipe cap receptacle. Then, I threaded a pipe cap on the top, and for the bottom constructed a removable spike with which to plant the assembly in the ground. To constrcut the removable spike, take a 3/4" threaded pipe cap, drill a hole in the center large enough to accomodate a 12" long aluminum spike, like those use to secure aluminum rain gutters to houses. Save the drill shavings. Poke the spike thru the hole in the pipe cap, then drop the PVC shavings in on top the spike, and fill with PVC cement. The PVC cement will melt the shavings, and when it solidifies, creates a very rigid fixture. When you want to go out in the field, simply pund the spike into the ground, thread on the antenna, connect the coax, and you're on the air! You can also create other threaded mounts using pipe caps, so you have a modular antenna system. I have a roof mount that I'm working on that allows me to use the same J-pole at home as I use in the field. 73, Russ Hoffman reh@fore.com N3WDZ From lwbyppp@epix.net Fri Jan 26 13:40:28 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!ornews.intel.com!news From: Collier_Chun@ccm.hf.intel.com (Collier Chun) Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF disguise antenna for Mobile use Date: Thu, 25 Jan 96 06:58:56 PST Organization: Intel Corporation Lines: 15 Message-ID: <4e85ua$1jv@ornews.intel.com> References: NNTP-Posting-Host: cchun.intel.com Mime-Version: 1.0 X-Newsreader: WinVN 0.93.8 In article , Anaylor@inetnebr.com says... >A friend and I were discussing the possiblites of combining the AM/FM >antenna in a car with an antenna for VHF and or UHF use. I have heard of >some sort of matching circuts but have been unable to find any plans.. Any >help would be greatly appreciated.. Thanks in advance I've done two installations where I put my wideband Kenwood receiver/scanner i nto Toyota's. Quick-testing revealed that the coax that Toyota uses between the b roadcast radio in the car to the antenna is almost useless above 150 MHz. I use a VHF/ UHF duplexer to feed the scanner so that the standard broadcast antenna is used for below 1 50 MHz and a separate glass-mounted 440 MHz antenna covers the rest. I don't know if other auto antenna coax has this same characteristics, but thi s is a caveat. From lwbyppp@epix.net Fri Jan 26 13:40:29 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Roger A. Cox <75052.3037@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF Log Periodic Date: 24 Jan 1996 01:21:28 GMT Organization: Telex Communications, Inc. Lines: 10 Message-ID: <4e41io$n98$1@mhafn.production.compuserve.com> References: <4d8c6l$bmr@nnrp1.news.primenet.com> Mike, Yes, LPCAD will work with HF logs also, however the program only works with cylindrical elements. So, to analyze an existing antenna, you will need to use the average element OD. To create a new design, the average element OD should be converted into equivalent tapered sections. This will get you close. The rest is up to you. 73, Roger WB0DGF From lwbyppp@epix.net Fri Jan 26 13:40:30 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!news.net99.net!news.vbc.net!news.cais.net!xara.net!SoNet!rmplc!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: Fri, 19 Jan 96 20:33:12 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 5 Message-ID: References: <4dkiob$po3@atlas.uniserve.com> NNTP-Posting-Host: bos1d.delphi.com X-To: Jeff According to Sterba, "A square is always better than a dipole". So a square laying on the ground should be better than a dipole at 100 ft. :-) 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Fri Jan 26 13:40:31 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!atlantis.utmb.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 23 Jan 1996 05:50:32 GMT Organization: Texas A&M University, College Station, TX Lines: 80 Message-ID: <4e1sv8$p14@news.tamu.edu> References: <4dkiob$po3@atlas.uniserve.com> <4dpt7f$4pn@news.tamu.edu> <4e0ok3$hkv@hpscit.sc.hp.com> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In <4e0ok3$hkv@hpscit.sc.hp.com>, rkarlqu@scd.hp.com (Richard Karlquist) write s: >In article <4dpt7f$4pn@news.tamu.edu>, wrote: > >>About the only one's you can get to do a nice job with your feet still on th e >>ground most of the time are the vertical arrays. My 4 Rohn 25G 66 foot >>self supporting towers in a 4 square with a cubic yard of concrete each >>didn't grow there by themselves, but they do work. >> >>Mike W5WQN as a guest at leviathan.tamu.edu >> > >Now that raises some eyebrows! Rohn 25G is only supposed to be self supporti ng >to 30 feet. Can you explain what you're doing in more detail? > >Rick Karlquist N6RK >rkarlqu@scd.hp.com Simple. Check the book again. I think the wind load you are looking at is for a tower with an antenna at the top! These are six sections of Rohn 25G, the lowest one sunk 3 feet into a cubic yard of concrete each. There is a 1 + inch section of galvanized 10 ft. EMT stinger at the top strapped to each tower for some 6-7 feet more top height with a slug of stainless steel hose clamps, safetied, for reasonance. The array has all the radials bonded to the bases. Of course the tower sections are solid grounded. Ufer ground style into the blocks with direct connections to the radial field sort of solves the lightning problem. :) Each tower section is fed with about a 30 odd foot gamma match section of matching section made from TV twin lead stand-off insulators. The top of the gamma match line joins the tower itself at a 45 degree angle from the top stand off and bonded to the tower just above one of the joints. The bottom of the gamma match section is reasonated for a forced match at each tower base by four ARC-13 surplus silver plated brass tuning variable caps with about at two foot section of RG-8 coax uses in parallel with them to bring the rand of the caps in line. Cheap at most ham fests... Whole array is fed with DX Engineering phase box a-la Collins style. Tune each tower to exactly the same format with an MFJ combo SWR and impedance bridge. They all are perfect matches size wise tower for tower. Hook up the phase delay lines, hook up the line to the shack. By itself, a vertical fed this way can be brought down to where the needle wil l not move off the zero mark, but your total array SWR will not be that good. I can change the exit impedance with an antenna tuner at the dummy load port on the phase box and see the F/B ration null, but each lobe is never perfect. Performance on the 40 meter one is about text book. 6 or so DB forward gain with anywhere from 25-30+ F/B, however, you will find that the F/B is really variable depending on the arrival angle of the sigs. The array can be optimized for F/B by adjust the spacing and phasing minutely to favor a higher or lower angle by playing around with MNC by W6TI, which I use, and really do like and use HEAVILY, paid for, and all, although I HATE HATE HATE his copy protection that has caused me a LOT of misery and grief as I change hardware like clothes. The array just took another round of 70 mph gusts this weekend here in tornado alley. The towers move a bit, but there is no spurious reasonance (mechanically) in the stingers. They just sulk there. I've seen more than 70 mph gusts so far, zero deflection, no guys at all...... You'd be wise to be SURE where you puch the holes for the concrete. If you miss, it hurts. I played with a 40 meter version of this for a while, solid grounded poles with elevated grounded bonded radials up 9 feet before I got up enough guts to hand dig the holes and pour the concrete..... Nice neat clean array any girl friend can appreciate too... Mmmmm... :) Mike as a guest at leviathan.tamu.edu From lwbyppp@epix.net Fri Jan 26 13:40:33 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 23 Jan 1996 11:48:51 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 18 Sender: root@newsbf02.news.aol.com Message-ID: <4e33hj$jo0@newsbf02.news.aol.com> References: <4e0j96$50g@hpcvsnz.cv.hp.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , rohrwerk@netcom.com (John Seboldt) writes: >The half square is a PAIR OF VERTICALS! Actually a pair of phased >verticals independent of ground. The radials of an *excellent* vertical >will have some effect in helping ground conductivity near the antenna, of >course, but you will not have the ground losses of a less-than-perfect >radial system with the half square. I suspect the half square still has appreciable losses. The flat top wire radiates in directions other than the desired direction (that certainly causes losses), and the radiating fields induce current in the lossy ground below the antenna. There are no radials to "shield" the antenna from the lossy earth. I bet these losses are significant. 73 Tom From lwbyppp@epix.net Fri Jan 26 13:40:33 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: marktaint@aol.com (MARKTAINT) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 22 Jan 1996 01:16:52 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <4dva4k$od4@newsbf02.news.aol.com> References: <4drt9p$qv0@atlas.uniserve.com> Reply-To: marktaint@aol.com (MARKTAINT) NNTP-Posting-Host: newsbf02.mail.aol.com Do you have any high supports? Like a couple 70 foot trees about 140 feet apart? If so my vote would be for a halfsquare antenna. It's a pair of qtr. wave vertical wires in phase 1/2 wavelength apart. you feed it in one of the corners. It works great if it's pointing the direction you want! Good luck! Mark, N0YRW From lwbyppp@epix.net Fri Jan 26 13:40:34 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news.infinet.com!imci3!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 24 Jan 1996 09:27:26 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 19 Sender: root@newsbf02.news.aol.com Message-ID: <4e5fke$sgi@newsbf02.news.aol.com> References: <4e4n45$agg@news.tamu.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4e4n45$agg@news.tamu.edu>, mluther@tamu.edu writes: > >That lead to my plea for help on what to do in some way to somehow tune >it out of inferometrence, to coin a word here. > > We corrected this type of problem all the time at BC stations. The correct way to detune the tower is to put a capacitor across a vertical area of the tower, and adjust it for minimum current in the tower above or below the trap. You may need multiple traps along the tower, but it's a lot easier than moving the tower. I use that method here at the present time, and I used that system on hundreds of BC towers and structures like power poles that were causing pattern distortion when I was doing BC antenna work. 73 Tom From lwbyppp@epix.net Fri Jan 26 13:40:36 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 24 Jan 1996 07:29:09 GMT Organization: Texas A&M University, College Station, TX Lines: 59 Message-ID: <4e4n45$agg@news.tamu.edu> References: <4dpt7f$4pn@news.tamu.edu> <4e3hhk$q1s@newsbf02.news.aol.com> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In <4e3hhk$q1s@newsbf02.news.aol.com>, w2foe@aol.com (W2FOE) writes: >I agree with Mike 80 Meter DX antennas are work. l too have a 4square >array and while the dollar cost was relatively cheap, I estimate that I >have about 400 hours in it. However, it does work and I'm not worried >about wind and ice taking it down. Mike is right on another count too - >they take a lot of space. The four square with its radials takes up >approximately 1 acre (roughly 200' by 200' and if I were doing it again I >would increase the spacing). Everything interacts with it. I once >thought I wwas being very clever and put up a 160 meter inverted L in the >middle of the 4 square and tied it to the same ground system. Seemed like >a great idea at the time, but the 4square never worked again until I took >it down. > >Good luck, and if you find one that's easy let us all know. > >Regards, Merv Despite my anger at 6STI for the copy protection, I really DO use the product and depend on it. You are right BIG time on the damage to the pattern of the array by chunking something in the middle of it. I, very wrongly, thought instinctively that in the middle was the safest place to put a 200 foot tower. Instinct is what a skunk does under your house when you run one under there and shoot it there too because you didn't do the job right out in the fairway the first time! I lost a nice girl friend in high school doing that, however her dad couldn't say much. He is the one who insisted I use his 22 instead of my shotgun, even furnished the shells from his pocket that night. It died right under the ir coat closet at the front porch where all their fur coats were hanging. :) That fiasco, on the screen of course, lead me to plunking the tower all over creation trying to get rid of the pattern distortion. Gee, on 80, if you hav e about 600 feet to spare in separation, the pattern settles down somewhat. That lead to my plea for help on what to do in some way to somehow tune it out of inferometrence, to coin a word here. Frank Donovan W3LPL, came to my aid here in the group, suggesting a forced reasonance of the higher tower with a mid point long wire, somewhat like your errant 160 meter inverted L, but with a devious plot in mind, pun intended. I'm toying with the plots when I can wrench time away from all the other work, with MNC, to see exactly how to detune this glorious propsed new 200 foot rotating tower nighmare. Plus, if I ever can muster up the funds for a full sized 4 square transmitting array on 160, you can bet I won't place it ANYWHERE, except in the back forty, after watching MNC make fun of my instincts. :) Mike W5WQN as a guest at leviathan.tamu.edu From lwbyppp@epix.net Fri Jan 26 13:40:37 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 26 Jan 1996 06:43:07 GMT Organization: Texas A&M University, College Station, TX Lines: 54 Message-ID: <4e9t5r$slr@news.tamu.edu> References: <4e76fb$od1@news.tamu.edu> <4e8l64$gb7@newsbf02.news.aol.com> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In <4e8l64$gb7@newsbf02.news.aol.com>, w8jitom@aol.com (W8JI Tom) writes: >In article <4e76fb$od1@news.tamu.edu>, mluther@tamu.edu writes: > > >I'm a bit puzzled by all that. If the horiz wire is 1/2 wave long , any >effect of tying it to the center will be minimized and highly dependent on >the reesonant frequency and L/D ratio of the wire. Think about it, it is a >very high impedance end fed wire that has a large impedance variation >around resonance. No, his suggestion was to conside the distance to the botom ** or ** to the top, including the horizontal stub wire as the 1/2 wave length, not just the length to the tiew point. That, per his suggestion, forces the tower out of the picture as a tuned complete unit outside the range of problems! > >On the other hand, a 1/4 wave wire will have a more gradual impedance >variation less dependent on L/D ratio, and a much lower impedance at the >tie point! I think I understand this. >If the proper design de-tuning system is employed, the BW is reasonable >and it is not readily detuned. BW becomes poor if too small a capacitor is >used, or if a large area of the pole is tuned. Better to tune two or three >small areas! I did installations that remained in tune for years, and even >Big Bird from Sesame St wouldn't bother em. I never tried multiple segments. I can see where that would help. I do understand that a reasonable balance between L and C is required to make the system work well. >Now if I wanted a real "broad-band" de-tuning here's what I would do. I'd >run out and buy a gross split ferrite cores, and clamp a stack of 'em >around the legs at every tower section junction. I'd use a core that had >as much impedance as I could find within the limitation of maintaining a >reasonable Q at the operating frequency, certainly Q>5. Now THAT is a novel idea! > >More on the rest later. > Please do, if you will! Mike as a guest at leviathan.tamu.edu From lwbyppp@epix.net Fri Jan 26 13:40:38 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!news.new-york.net!uunet!in1.uu.net!newsfeed.internetmci.com!EU.net!Belgium.EU.net!ping.be!news From: Geert.Pirens@ping.be (Geert Pirens) Newsgroups: rec.radio.amateur.antenna Subject: WANTED schematic of a IF-100 interface Date: Thu, 25 Jan 1996 00:53:22 GMT Organization: PING Belgium Lines: 8 Message-ID: <4e6k85$qp0@ping1.ping.be> NNTP-Posting-Host: dialup37.hasselt.eunet.be X-Newsreader: Forte Free Agent 1.0.82 Can someone help me on a schematic of an IF-100 interface ? All information is welkom ! Geert Pirens,ONL2057 From lwbyppp@epix.net Fri Jan 26 13:40:39 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!ddsw1!news.mcs.net!usenet From: gmyers@mcs.com (Gary Myers) Newsgroups: rec.radio.amateur.antenna Subject: Re: Why is man-made RFI vertically polarized? Date: Fri, 26 Jan 1996 00:51:33 GMT Organization: Self Lines: 25 Message-ID: <4e98jh$2t4@Jupiter.mcs.net> References: <4e8qfj$ntn@fidoii.cc.lehigh.edu> NNTP-Posting-Host: gmyers.pr.mcs.net X-Newsreader: Forte Free Agent 1.0.82 lusgr@chili.CC.Lehigh.EDU (Stephen G. Roseman) wrote: > In the ARRL General Class study guide (and I've seen it other places) >is a statement the "man-made interference is usually vertically polarized". > In 25 words or less, anyone know why? >Thanks, >Steve, N3WHW >---------------------------------------------------------------------------- >Steve Roseman >Lehigh University Computing Center >lusgr@chili.CC.Lehigh.Edu Gauss' law requires that the electric field must always be perpendicular to a conductor. Since manmade rfi usually arrives by ground wave (as opposed to skip), the electric field is perpendicular to the conducting earth, i.e., vertically polarized. Ok, ok, that's more than 25 words... Gary K9CZB gmyers@mcs.com From lwbyppp@epix.net Fri Jan 26 13:40:41 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: wire antenna impedances Date: 23 Jan 1996 19:25:27 GMT Organization: Intel Corporation, Chandler, AZ Lines: 39 Distribution: world Message-ID: <4e3cn7$1fn5@chnews.ch.intel.com> NNTP-Posting-Host: vegas.ch.intel.com Many people have asked how to estimate the impedance of a center-fed wire antenna without antenna modeling software. I don't know if anybody else has posted anything on that subject, but here is what I found based on a 10MHz half- wavelength dipole, 46.8 ft long, 30 ft high, fed with 300 ohm ladder-line. The following Smith chart is normalized to 300 ohms so multiply every point by 300 to get an approximate antenna impedance. The data points were generated using ELNEC. Get a Smith Chart. Draw a circle centered at 1.4-j0.2 and passing through 0.33+j0. Label the 0.33+j0 point as odd- half-wavelengths. Label the 14.0+j0 point as even-half- wavelengths. Draw an arc centered at 1.6-j0.6 from 0.33+j0 down to the boundary at 0-j1.4. Draw a line straight down from the center 1.0+j0 to 0-j1.0 and label point 0.1-j1.0 as the 3/8 wavelength point. From an odd-half-wavelength, increasing the length will take you in a clockwise direction, i.e. inductive. Decreasing the length will take you in a counter-clockwise direction, i.e. capacitive. This is a conceptual aid, not a very accurate representation. All odd-half-wavelength values come out at 100 ohms resistive. All even-half-wavelength values come out at 4200 ohms resistive. _These are only approximations_ and will indicate approximately what your balun and antenna tuner are up against for center- fed wire antennas. Remember, the impedance values read from the chart are for the antenna and are transformed by the length of the 300 ohm ladder-line which I have measured at a velocity factor of 0.8 Note that half way around the above chart is a half-wavelength which is different from a normal Smith chart. In general, we want our baluns and antenna tuners to see values on the left-central side of the chart, rather than on the far right, far top, far bottom, or far left. Hope this is helpful. 73, Cecil, KG7BK, OOTC (Not speaking for my employer) From lwbyppp@epix.net Fri Jan 26 13:40:41 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.iadfw.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!nntp-trd.UNINETT.no!telepost.no!statoil!fou.tr.statoil.no!trm From: trm@fou.tr.statoil.no Subject: Wizard antenna for 80m Message-ID: Keywords: Cramped space solution. Sender: usenet@statoil.no Nntp-Posting-Host: 143.97.83.112 Organization: Statoil R&D, Trondheim, Norway. X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Date: Tue, 23 Jan 1996 14:39:15 GMT Lines: 4 I have 21m free horizontal space available. You clever guys out there figure out an optimum antenna design for 80m DX-ing. I supply 100w costly HF power. Good luck! LA7WWJA Tormod Hals From lwbyppp@epix.net Fri Jan 26 13:40:43 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: Wizard antenna for 80m Date: 24 Jan 1996 07:39:59 GMT Organization: Texas A&M University, College Station, TX Lines: 39 Message-ID: <4e4nof$agg@news.tamu.edu> References: Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In , trm@fou.tr.statoil.no writes: >I have 21m free horizontal space available. You clever guys out there figure >out an optimum antenna design for 80m DX-ing. I supply 100w costly HF power. >Good luck! >LA7WWJA Tormod Hals Use a GIANT coaxial shield vertical, just like a huge expansion of the ones you see in the handbooks for 2 meters. Put about three yards of concrete down to make it self supporting, with no guys. Go up with heavy enough tower to make the self supporting tower. Make your coaxial sleeve on the outside out of a ring of vertical wires, sort of like around bicycle wheels for spacers mounted on spacers on the tower. Minimizes wind loading. You feet the upper active element at the mid point, like the gap. Unlike what I see posted here about the Gap and it not liking 100 MPH winds too well, you can control the project so it will survive whatever. It will get out just fine. About a hundred square feet of land space is all you need. :) Variations on this theme of insanity, etched by the afforability of your pocketbook and your willingness to consume a bit more ground space, such as the conical monopole and the like, will do about as well for you. They say in defensive driving school that humor is the best teacher. To low band DX - on a small lot - with low power... Mike W5WQN as a guest at leviathan.tamu.edu From lwbyppp@epix.net Fri Jan 26 13:40:44 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Wizard antenna for 80m Date: 25 Jan 1996 06:49:42 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 31 Sender: root@newsbf02.news.aol.com Message-ID: <4e7qom$4kh@newsbf02.news.aol.com> References: <4e4nof$agg@news.tamu.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , trm@fou.tr.statoil.no writes: >I have 21m free horizontal space available. You clever guys out there figure >out an optimum antenna design for 80m DX-ing. I supply 100w costly HF power. >Good luck! >LA7WWJA Tormod Hals > I recommend a "dipole" antenna as high in the air and as long as it can be. Feed it with open wire line dropped vertically straight down to a tuner. Bring as many radials as you can to the tuner from all directions. If you tie the feeders together and load the antenna as a "T" against ground on 80 and 160, it will be a top loaded vertical. If you connect the antenna in a normal dipole configuration it will work well on the higher bands. Use a good ground system with plenty of straight radials. Make the radials as long as space allows. The feedline should drop vertically to the ground and be away from other objects. The tuning system should be at the ground connection if possible. I've used a system like this on 160 through 10 meters, and worked a lot of DX. It is inexpensive, serves multiple uses, and works very well on all bands. 73, Tom From lwbyppp@epix.net Fri Jan 26 13:40:45 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!eng.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore From: cmoore@vegas.ch.intel.com (Cecil A. Moore~) Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: 22 Jan 1996 01:49:34 GMT Organization: Intel Corporation, Chandler, AZ Lines: 10 Distribution: world Message-ID: <4duqfe$1h2b@chnews.ch.intel.com> References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> NNTP-Posting-Host: vegas.ch.intel.com In article <4dr03e$n1l@newsbf02.news.aol.com>, W8JI Tom wrote: >1.) A bottle of saltwater for a ground. Run wires from the rig into the >bottle, and throw some pennies in the bottle to improve the ground. Hey Tom, there's nothing wrong with this advice as long as you have a very biiigggg bottle and lots and lots of pennies. :-) 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Fri Jan 26 13:40:45 1996 Path: news.epix.net!news.sprintlink.net!news.mcn.net!blpm01-195 From: vfiscus@mcn.net (Vince Fiscus, KB7ADL) Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: Wed, 24 Jan 96 00:13:58 GMT Organization: Montana Communications Network Lines: 4 Message-ID: <4e3tkn$4me@news.mcn.net> References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> NNTP-Posting-Host: blpm01-195.mcn.net X-Newsreader: News Xpress Version 1.0 Beta #4 A broken coax. Cuts down on neighborhood QRN. ;-) From lwbyppp@epix.net Fri Jan 26 13:40:46 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: 24 Jan 1996 01:35:57 GMT Organization: SRC Lines: 19 Message-ID: <4e42eg$4u6@news.iii.net> References: <4dot60$kv1@daily-planet.execpc.com> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: whiteboy@earth.execpc.com Whats the BEST coax... Try Andrew 4" Heliax with type "N" connectors. Good, but seriously, use the lowest loss coax you can find. 9913 is good, but I've reciently see some other promising stuff. Don't believe the trash about thick wire needing power. On the other hand, a 30 foot run of almost anything is good enough. So, if your looking for that last .1 db savings,,, use real low loss cable, the bigger the better. Tom WA1RHP From lwbyppp@epix.net Fri Jan 26 13:40:47 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: Thu, 25 Jan 96 21:24:48 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 8 Message-ID: References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> NNTP-Posting-Host: bos1d.delphi.com X-To: writes: >that he "gets out better now" since he replaced his mike cable with RG-8. > Hi Terry, could be his old mike cable was shorted out. :-) 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Fri Jan 26 13:40:48 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!imci4!imci5!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: sshumway@ix.netcom.com (Steve Shumway ) Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: 26 Jan 1996 01:37:35 GMT Organization: Netcom Lines: 25 Message-ID: <4e9b8v$15@cloner3.netcom.com> References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> NNTP-Posting-Host: akr-oh3-23.ix.netcom.com X-NETCOM-Date: Thu Jan 25 5:37:36 PM PST 1996 In <4dr03e$n1l@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writes: > >Boy, I'll second that. If you want to learn something the wrong way, learn it from an expert on CB! Some of the neat things I've heard over the years from CB'ers are: > {snip} > >Did I miss anything????? Never put a lead acid battery directly on a cement floor, it will go dead. Always put it on a couple of 2*4's Hot water will freeze before cold water I'm sure there are many more. Might be fun to start a colection. TNX de N8SHP Steve Shumway sshumway@ix.netcom.com From lwbyppp@epix.net Fri Jan 26 13:40:48 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsjunkie.ans.net!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail From: c002@Lehigh.EDU Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: 24 Jan 1996 17:41:10 -0500 Lines: 13 Message-ID: <4e6ci6$1ubq@ns1-1.CC.Lehigh.EDU> NNTP-Posting-Host: ns1-1.cc.lehigh.edu >Try Andrew 4" Heliax with type "N" connectors. right....like a CBer has enough money for that!! :) besides, i beat the reply to him....i said 5" :-P~ DAvid |-----------------------------------------------------------------------| | David Roseman | c002@lehigh.edu OUTTA ORDER! | SysOp of NODE 3 BBS | The Flying HAm - BBS | | | Running OBV/2 Software | Technomage - BBS | | | | N3SQE/1 - HAm V | | | N3SQE@Nxxxx.FNxxxx.PA.USA.NA - Packet | |-----My AWESOME home page :) http://www.lehigh.edu/~c002/c002.html-----| From lwbyppp@epix.net Tue Jan 30 16:13:36 1996 Path: news.epix.net!uunet!in1.uu.net!istar.net!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!Rezonet.net!altitude!Stratus.CAM.ORG!not-for-mail From: jlyons@CAM.ORG (James Lyons) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Re: ***ONE OF THE BEST HAM WEB PAGES ON THE INTERNET. TRY IT OUT!!*** Date: 22 Jan 1996 13:49:59 -0500 Organization: Communications Accessibles Montreal, Quebec Canada Lines: 24 Message-ID: <4e0m8n$gmh@stratus.CAM.ORG> References: <4dk7io$kd1@fnord.dfw.net> <4dlre7$mkr@superb.csc.ti.com> In-Reply-To: <4dlre7$mkr@superb.csc.ti.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Xref: news.epix.net rec.radio.amateur.misc:97408 rec.radio.amateur.antenna:18711 rec.radio.amateur.digital.misc:13825 rec.radio.amateur.equipment:24270 rec.radio.amateur.homebrew:13004 rec.radio.amateur.policy:32834 rec.radio.amateur.space:6217 On 18 Jan 1996, Ken Durham wrote: > In article <4dk7io$kd1@fnord.dfw.net>, dmclean@dfw.net says... > > > >Hello all: > > > > In the last message that I sent over usenet I forgot to include my > >url for my web site. The URL is "http://www.dfw.net/~dmclean". > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ` > I tried this URL yesterday and again this morning with no results. Netscsape > keeps contacting the host forever. Please try your page from another site an d > see if it can be accessed. > > Ken Durham K5MBV mbv@ti.com > > > I had no problem accessing it yesterday (Sunday) afternoon, twice ... once via Netscape and once via Lynx. Jim Lyons From lwbyppp@epix.net Tue Jan 30 16:13:37 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!torn!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Sterba again Date: 22 Jan 1996 16:52:38 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 33 Sender: root@newsbf02.news.aol.com Message-ID: <4e10v6$ilb@newsbf02.news.aol.com> References: <4dtvba$18ak@chnews.ch.intel.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4dtvba$18ak@chnews.ch.intel.com>, cmoore@vegas.ch.intel.com (Cecil A. Moore~) writes: >So my 88ft EDZ centerfed *is* a "dipole" on 20m because of the two >broadside major nodes but not a "dipole" on 17m where it has a >4-lobbed clover-leaf pattern? That is correct it is NOT a 17m dipole antenna. It is a 20m collinear dipole even when used on 17m. Or a 5.3 MHz dipole antenna on all bands, even when you use it on 160 or 2 meters, and for receiving or transmitting. The point is, a dipole antenna does NOT need to have only "two poles", it can have hundreds of electrical poles and still be a dipole antenna if the phase is correct. Unless the IRE's definition of antenna terms and engineering textbooks are incorrect. >The confusing part for me is during receive. The antenna doesn't >know what frequency the receiver is tuned to or even if the >receiver is powered up or not. How does it know whether to be >a dipole or not during non-transmitting times? If I'm not home >and you drive by my house, would you say I had a dipole or not? >I can buy how using it during transmit can change its definition. >I have trouble accepting that thinking about it can change its >definition. If only that worked with girlfriends. :-) Only after a few beers, in both cases! The confusion comes from using the abbreviated name. For instance, I used to date a gal by the name of Cheryl Teagues. If I just called her Cheryl, no one could form a mental picture of who I was talking about. If I used her abbreviated name "Cher", the picture was further confused. It didn't matter if I was speaking of her in terms of receiving or transmitting something, at least not for a week or two. 73 Tom From lwbyppp@epix.net Tue Jan 30 16:13:38 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 22 Jan 1996 19:30:11 GMT Organization: Hewlett-Packard Lines: 15 Message-ID: <4e0ok3$hkv@hpscit.sc.hp.com> References: <4dkiob$po3@atlas.uniserve.com> <4dpt7f$4pn@news.tamu.edu> NNTP-Posting-Host: hpscrj.scd.hp.com In article <4dpt7f$4pn@news.tamu.edu>, wrote: >About the only one's you can get to do a nice job with your feet still on the >ground most of the time are the vertical arrays. My 4 Rohn 25G 66 foot >self supporting towers in a 4 square with a cubic yard of concrete each >didn't grow there by themselves, but they do work. > >Mike W5WQN as a guest at leviathan.tamu.edu > Now that raises some eyebrows! Rohn 25G is only supposed to be self supportin g to 30 feet. Can you explain what you're doing in more detail? Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Tue Jan 30 16:13:39 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!news.uoregon.edu!news.u.washington.edu!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!caen!spool.mu.edu!howland.reston.ans.net!psinntp!psinntp!psinntp!news1.h1.usa.pipeline.com!usenet From: dmalley@usa.pipeline.com(Dave Malley) Newsgroups: rec.radio.amateur.antenna Subject: MOSLEY TA34M Question Date: 24 Jan 1996 00:22:37 GMT Organization: Pipeline USA Lines: 8 Message-ID: <4e3u4d$413@news1.usa.pipeline.com> NNTP-Posting-Host: pipe10.h1.usa.pipeline.com X-PipeUser: dmalley X-PipeHub: usa.pipeline.com X-PipeGCOS: (Dave Malley) X-Newsreader: Pipeline USA v3.4.0 Does anyone have experience with the TA34M and/or TA34XL that would favor one antenna or the other? Any difficulties with erecting the TA34M (a modified TA33) or it's performance? Thx a lot! Dave, K1NYK dmalley@usa.pipeline.com From lwbyppp@epix.net Tue Jan 30 16:13:40 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs From: rs@ham.island.net (Robert Smits) Newsgroups: rec.radio.amateur.antenna Subject: Re: need info: 5/8 wave 2m/70cm antenna Message-ID: <012496212329Rnf0.79b6@ham.island.net> Date: Wed, 24 Jan 1996 21:23:00 PST References: <4e3l0k$pri@linus.mitre.org> Reply-To: rs@ham.island.net Distribution: world Organization: The Curmudgeon's Cottage X-Newsreader: Rnf 0.79b6 Lines: 23 Al Wong writes: >Has anyone any recommendations for a good 5/8 wave 2m/70cm >mobile antenna? > >Only one stumping block....The car is corvette, thus mag/trunk >mounts are out of the picture. > >Is my only other choice a window mount antenna? > Nope. Larsen has a 2m-70cm antenna that uses a half wave element for 2 metres and collinear elements for 70cm - and doesn't need a ground plane, according to Larsen. The NMO-2/70 uses the Motorola style mount (3/4 " hole) and the NLA-2/70 uses the 3/8 " hole mount. I haven't used it myself, although I've been very happy with individual Larsen VHF and UHF mobile antennas. -- rs@ham.island.net (Robert Smits, VE7HS) From lwbyppp@epix.net Tue Jan 30 16:13:41 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet From: a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) Newsgroups: rec.radio.amateur.antenna Subject: Re: ?impedance of longwire? Date: Thu, 25 Jan 1996 01:03:18 GMT Organization: Regional Computing Center, University of Cologne Lines: 5 Message-ID: <4e6kqr$fja@news.rrz.uni-koeln.de> References: <4dg7m7$f2i@news.rrz.uni-koeln.de> <4dqdho$h8i@ixnews7.ix.netcom.com> <4e34va$fsc@news.rrz.uni-koeln.de> NNTP-Posting-Host: annexr2-9.slip.uni-koeln.de X-Newsreader: Forte Free Agent 1.0.82 Thanks to all who helped me. Question was answerd sufficiently. 73 thilo From lwbyppp@epix.net Tue Jan 30 16:13:42 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcomsv!uu3news.netcom.com!netcomsv!uu4news.netcom.com!infosphere.com!usenet From: Norm Hammar Newsgroups: rec.radio.amateur.antenna Subject: hidden antenna Date: Thu, 25 Jan 1996 06:35:49 -0700 Organization: CQG Lines: 3 Message-ID: <31078735.6406@cqg.cqg.com> NNTP-Posting-Host: rofpop19.infosphere.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) I live in a subdivision that prohibits antennas. Does anyone have any plans for an HF (80-10 meter) antenna that would be inobtrusive? EMail to norm@cqg.com From lwbyppp@epix.net Tue Jan 30 16:13:43 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!news.moneng.mei.com!sol.ctr.columbia.edu!news.mindlink.net!van-bc!news.rmii.com!usenet From: kc0rl@rmii.com (Eugene L. Olson) Newsgroups: rec.radio.amateur.antenna Subject: Re: Need 16' vertical; easy breakdown/collapsable Date: Thu, 25 Jan 1996 07:29:35 GMT Organization: Rocky Mountain Internet Inc. Lines: 20 Message-ID: <4e7beq$qd8@natasha.rmii.com> References: <4dmhqr$do@clarknet.clark.net> NNTP-Posting-Host: slip8141.rmii.com X-Newsreader: Forte Free Agent 1.0.82 Why not just use a center fed 20 meter dipole and hang it from a tree in the vertical configuration? kc0rl, "Ole" ------------------------------------------------------------------------------ -------------------- wilder@clark.net (richard l wilder k3di) wrote: >I need a 16' vertical that is easy to break down or can be collapsed. >73, Dick Wilder, K3DI (ZF2OP QRP in ARRL CW contest next month.) ==================================================== Eugene L. Olson, "Ole" - Amateur Radio Call: KC0RL Internet: kc0rl@rmii.com - Packet Radio: KC0RL@W0LKD ==================================================== From lwbyppp@epix.net Tue Jan 30 16:13:44 1996 Path: news.epix.net!uunet!in2.uu.net!cs.utexas.edu!news.ti.com!usenet From: Joseph Fitter BV/N0IAT Newsgroups: rec.radio.amateur.antenna Subject: Re: Source of Al tubing? Date: 25 Jan 1996 09:31:37 GMT Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C. Lines: 19 Message-ID: <4e7ilp$lgh@tilde.csc.ti.com> References: <30FC3749.ED3@lamar.colostate.edu> <4dkm3v$dpr@sparky.midwest.net> NNTP-Posting-Host: 137.167.36.115 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) >>I'm looking for a source of Al tubing to build some antennas. Any >>suggestions? >>ttfn fiz (KG0YG) Texas Towers in Plano, TX sells AL tube in many sizes. See details in >QST/CQ/73 mags. >Marty Albert (Amatuer Radio Station KC6UFM) >Fredericktown, MO USA I might add that the fine folks at Texas Towers shipped me a bunch of Aluminum when I was living in Tokyo, Japan. They worked out all the shipping details etc. Wasn't cheap, but after a typhoon tore heck outta the antenna, it was worth the price to fix it "better than new". 73 Joe BV/N0IAT ex 7J1AOF From lwbyppp@epix.net Tue Jan 30 16:13:44 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!pravda.aa.msen.com!fu-berlin.de!news.dfn.de!news.ruhr-uni-bochum.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Vertical Antenna Date: 25 Jan 1996 10:01:48 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 9 Message-ID: <4e7kec$1vvi@info4.rus.uni-stuttgart.de> References: <4e0vvv$g8c@soap.news.pipex.net> <3104E8C5.1290@aol.com> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >The GAP folks (as I guess you know) say you can mount >it either about 8' off the ground on a metal pipe, or at rooftop, >with no difference in performance. ... and with no difference in performance if you operate it lying in its box just next to your rig. Judging by GAP's claimed efficiency they do not have the faintest clue about antenna performance. 73, Moritz DL5UH From lwbyppp@epix.net Tue Jan 30 16:13:46 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!nntp.net-link.net!news From: "Steven F. Johnson" Newsgroups: rec.radio.amateur.antenna Subject: Safety concerns: Info needed on antenna mooring Date: Thu, 25 Jan 1996 10:44:40 -0500 Organization: NetLink Systems, LLC. Lines: 24 Message-ID: <3107A568.527@net-link.net> References: <4du131$n60@maureen.teleport.com> NNTP-Posting-Host: lorien.net-link.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) A local business now owns a property on which a Rohn (?) 110G antenna was previously erected. This is a 110' antenna, with three sets of 3 guy wires. The owner wants to remove the guy wires and fasten the antenna somehow to his building instead, so he doesn't have to worry about cars or trucks hitting the pylons or wires. He's not using the antenna right now. This seems to me to be pretty unwise - if the guy wires weren't needed, they wouldn't be there. My questions: * Is Rohn the right company? (I heard "Roland" - but it could be Rollan or Rohn) * Is there a resource for information on antenna mooring systems that I can get to on the Net? * What is the approximate replacement cost for a 110' antenna tower? (The neighbors might get together and buy it from him to get him to take it down safely) I don't visit this newsgroup often, so any replies to my e-mail address, steve@net-link.net, would be greatly appreciated. From lwbyppp@epix.net Tue Jan 30 16:13:46 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!netaxs.com!news.cais.net!news.cais.com!cais3.cais.com!gttm From: USCG TELECOMMS Newsgroups: rec.radio.amateur.antenna Subject: W9INN Multi-band dipoles Date: Thu, 25 Jan 1996 13:55:24 -0500 Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 5 Message-ID: NNTP-Posting-Host: cais3.cais.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: gttm@cais3.cais.com Does anyone have experience with the Hi-Performance Dipoles, such as the HPD-3 160-80-40 dipoles? I'm looking for something with low SWR that would not require use of a tuner to cover the three top bands. Thanks. From lwbyppp@epix.net Tue Jan 30 16:13:47 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!news.Stanford.EDU!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 25 Jan 1996 14:10:22 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 24 Sender: root@newsbf02.news.aol.com Message-ID: <4e8kiu$g6f@newsbf02.news.aol.com> References: <4e1sv8$p14@news.tamu.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4e1sv8$p14@news.tamu.edu>, mluther@tamu.edu writes: > >These are six sections of Rohn 25G, the lowest one sunk 3 feet into a >cubic yard of concrete each. There is a 1 + inch section of galvanized 10 >ft. >EMT stinger at the top strapped to each tower for some 6-7 feet more top >height with a slug of stainless steel hose clamps, safetied, for reasonance. > > You probably noticed the "stinger" only makes the most minor change in resonant frequency. I'd like to highlight that point! The change from a large diameter lower section terminating in a small pipe is the root of the problem. With a 100 foot base insulated (series fed) tower on 160, the addition of a 40 foot "stinger" moved the resonant frequency less 40 kHZ!!!! The stinger must be the same capacitance per foot as the tower to have the same height effect as adding the same percentage of tower height. 73 Tom From lwbyppp@epix.net Tue Jan 30 16:13:48 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 25 Jan 1996 14:20:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 50 Sender: root@newsbf02.news.aol.com Message-ID: <4e8l64$gb7@newsbf02.news.aol.com> References: <4e76fb$od1@news.tamu.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4e76fb$od1@news.tamu.edu>, mluther@tamu.edu writes: >Frank suggested another way of doing this that used a multiple of a half >wave wire tied to the center point of the offending pole. He said that >properly chosen as to tap point, so as to split the tower equally, >electrically, >above and below the tap point, it was possible to force the tower out of >the pattern of the other array. He said they do that at the W3LPL site, as >opposed to the traditional capacitor tuning method, because it turns out to >be far broader in frequency range as to the tuning. He says that the use of > >the variable cap to tune a segment of the tower is so narrow in frequency >range that it makes it difficult to protect an antenna for the full 80 meter >band using this method. The other one works better, he claims. > > I'm a bit puzzled by all that. If the horiz wire is 1/2 wave long , any effect of tying it to the center will be minimized and highly dependent on the reesonant frequency and L/D ratio of the wire. Think about it, it is a very high impedance end fed wire that has a large impedance variation around resonance. On the other hand, a 1/4 wave wire will have a more gradual impedance variation less dependent on L/D ratio, and a much lower impedance at the tie point! If the proper design de-tuning system is employed, the BW is reasonable and it is not readily detuned. BW becomes poor if too small a capacitor is used, or if a large area of the pole is tuned. Better to tune two or three small areas! I did installations that remained in tune for years, and even Big Bird from Sesame St wouldn't bother em. Now if I wanted a real "broad-band" de-tuning here's what I would do. I'd run out and buy a gross split ferrite cores, and clamp a stack of 'em around the legs at every tower section junction. I'd use a core that had as much impedance as I could find within the limitation of maintaining a reasonable Q at the operating frequency, certainly Q>5. More on the rest later. 73 Tom From lwbyppp@epix.net Tue Jan 30 16:13:49 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!pacbell.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.oanet.com!usenet From: ve6dvp Newsgroups: rec.radio.amateur.antenna Subject: Re: CQ: All HF remote base users.............. Date: 25 Jan 1996 17:03:36 GMT Organization: YCS Internet Lines: 8 Message-ID: <4e8d58$424@hermes.oanet.com> References: <4dttam$otu@news.aros.net> NNTP-Posting-Host: 204.209.114.52 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: afn17891@afn.org We`re using a Kenwood TS 680 with a GAP antenna, good RX and TX. Tuning was simple and it stands up well to weather conditions here- we have60+mph winds and heavy snow and ice conditions . Control is via DTMF thru a Link-Comm RLC-2with expander board. Only problem is not enough control lines to be able to remotely switch HF-6 meter antennas, however we are in process of setting up remote switching by packet. 73`s Don(VE6DVP) From lwbyppp@epix.net Tue Jan 30 16:13:51 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci4!imci5!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!nntp-trd.UNINETT.no!Norway.EU.net!oslonett.no!sn.no!newsfeed.tip.net!dataphone!news.redshift.com!usenet From: Orrin Winton Newsgroups: rec.radio.amateur.antenna Subject: Rhombic antenna designer for windows Date: Thu, 25 Jan 1996 17:24:39 -0800 Organization: Redshift Online Service Lines: 13 Message-ID: <31082D57.4357@redshift.com> NNTP-Posting-Host: red118.redshift.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b4a (Win16; I) CC: orrin@redshift.com My "rhombic utility" for windows 3.1, version 2.04, is available from my ftp site. See details on my web page listed below. This program will design rhombics for HF and VHF and, among other things, give you dimensions in meters (xyz coordinates in meters) for inputting into an analysis program like EZNEC. -- orrin@redshift.com http://www.redshift.com/~orrin "Our uncle thought he was a chicken, but the family never would take him to the doctor for psychiatric treatment." "Oh, why was that?" "Well, it's cuz they needed the eggs." From lwbyppp@epix.net Tue Jan 30 16:13:52 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!nntp2.cerf.net!news.claremont.edu!drivel.ics.uci.edu!news.service.uci.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: michelwi@pb.COM (William Michels) Newsgroups: rec.radio.amateur.antenna Subject: Re: 72 ohm twin lead Date: 25 Jan 96 18:42:01 GMT Organization: ucsd usenet gateway Lines: 28 Message-ID: <9600258226.AA822606416@smtppc.ct.pb.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu 72 ohm transmitting twin lead was available last year from at least one source in the US. It consists of two No. 13 AWG stranded copper conductors spaced VERY close together and insulated . This is similar to the transmission line specified by G5RV in his original article, "An Effective Multi-Band Aerial of Simple Construction," RSGB Bulletin, July 1958. This is distinct from 72 ohm receiving twin lead, which uses smaller diameter conductors. The transmitting variety has similar loss characteristics to RG-8 at 7 MHz and below. Losses increase above 7 Mhz. The source for this transmission line is The RF Connection in Gaithersburg, MD. They can be reached at 1-301-840-5477 (inquiries) or 1-800-783-2666 (orders). They said it was a revival of the older Belden 8210 transmission line. Disclaimer: I have no affiliation with The RF Connection. Best Regards, Bill Michels michelwi@pb.com From lwbyppp@epix.net Tue Jan 30 16:13:53 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Material for Vertical Date: 25 Jan 1996 19:02:35 GMT Organization: ELNEC/EZNEC Software Lines: 35 Message-ID: <4e8k4b$ib3@maureen.teleport.com> References: <4e3m7m$gcg@castle.nando.net> NNTP-Posting-Host: ip-pdx14-14.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > geo@nando.net (George McCrary) writes: > Hello, > > I'm planning on consturcting a 40M 1/4 wave vertical in the woods > behind my house. I have a wire vertical already and would like to make > this one self-supporting (or at least not supported from above). > > Any suggestions for materials? Aluminium tubing is available in 6 foot > lengths and can be nested. What would the minimum size to use be? What > about TV mast? Conduit? > > Any suggestions would be appreciated. > > 73 DE KQ4QM (George) > > Please E-mail direct, my news server misses a lot of posts! I've had four self-supporting 40 meter verticals in my back yard for over 10 years now, and they've survived a couple of really strong windstorms. They're made from 6061-T6 aluminum tubing of 1-1/4, 1-1/8, and 1" diameter, nested. Our soil is clay, and I drove 8' galvanized steel chain link fence end posts 4' into the ground. Using slices from heavy wall PVC pipe for insulation, the verticals are clamped to the line posts with muffler clamps. My experience is that the aluminum tubing that you buy at home improvement stores is much too flexible for this use. I haven't tried other materials. There have been postings on this newsgroup fairly recently about where to get good aluminum tubing. Good luck! 73, Roy Lewallen, W7EL From lwbyppp@epix.net Tue Jan 30 16:13:54 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!sun4nl!Leiden.NL.net!inter.nl.net!waasdorp From: Coen Waasdorp Subject: Re: GAP Titan DX Vertical Antenna X-Nntp-Posting-Host: ldn98-21.leiden.nl.net Message-ID: <0RmLXBAR2+BxEwSK@inter.nl.net> Sender: news@inter.NL.net (News at newsldn) Organization: NL Net X-Newsreader: Turnpike Version 1.11 References: <4e0vvv$g8c@soap.news.pipex.net> <3104E8C5.1290@aol.com> <4e7kec$1vvi@info4.rus.uni-stuttgart.de> Mime-Version: 1.0 Date: Thu, 25 Jan 1996 20:52:33 GMT Lines: 29 In article <4e7kec$1vvi@info4.rus.uni-stuttgart.de>, moritz@ipers1.e- technik.uni-stuttgart.de writes >>The GAP folks (as I guess you know) say you can mount >>it either about 8' off the ground on a metal pipe, or at rooftop, >>with no difference in performance. > >... and with no difference in performance if you operate it lying in its >box just next to your rig. Judging by GAP's claimed efficiency they do not >have the faintest clue about antenna performance. > >73, Moritz DL5UH Moritz, I cannot completely agree with you. Working from PA country to VK, JA, LU, ZS and getting signal reports which do not greatly vary from the ones I give on 20 mtrs and higher to those operating two, three element quads, mono beams etc, does seem to indicate that some radiation is taking place. With the limited amount of space the GAP Titan DX is using, which for some of us is of great importance, I have not yet found a better working alternative. 73 -- Coen Waasdorp PA0COE From lwbyppp@epix.net Tue Jan 30 16:13:55 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 26 Jan 1996 06:56:35 GMT Organization: Texas A&M University, College Station, TX Lines: 68 Message-ID: <4e9tv3$slr@news.tamu.edu> References: <4e1sv8$p14@news.tamu.edu> <4e8kiu$g6f@newsbf02.news.aol.com> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.219 X-Newsreader: IBM NewsReader/2 v1.2 In <4e8kiu$g6f@newsbf02.news.aol.com>, w8jitom@aol.com (W8JI Tom) writes: >In article <4e1sv8$p14@news.tamu.edu>, mluther@tamu.edu writes: > >> >>These are six sections of Rohn 25G, the lowest one sunk 3 feet into a >>cubic yard of concrete each. There is a 1 + inch section of galvanized >10 >>ft. >>EMT stinger at the top strapped to each tower for some 6-7 feet more top >>height with a slug of stainless steel hose clamps, safetied, for >reasonance. >> >> > >You probably noticed the "stinger" only makes the most minor change in >resonant frequency. I'd like to highlight that point! > >The change from a large diameter lower section terminating in a small pipe >is the root of the problem. With a 100 foot base insulated (series fed) >tower on 160, the addition of a 40 foot "stinger" moved the resonant >frequency less 40 kHZ!!!! The stinger must be the same capacitance per >foot as the tower to have the same height effect as adding the same >percentage of tower height. > I didn't check the case for length vs frequency. It was a case of either thro w another top section up there and trim it to length, or chunk up the stinger. We tried the stinger first. It worked. One of the things that seems to change things markedly is the fact that all my stuff is solid grounded tower stuff. There are no insulated towers at all in any of these systems. Feeding them all by gamma match seems to have a MUCH smoother setup process than insulated tower elements. I realize that feeding them this way doe NOT create a perfect equivalent of a simple element pole. The current profile in the complex element may make the comment you made above not quite as relevant. I don't know enough hard theory and math to debate the issue with anyone. :) The things don't seem to be near as critical for an inch or two here and all that which I saw with insulated versions. Although it would seem that if the bandwidth was very broad for the element, the Q must be horribly low and thus the efficiency ought to be lower also. In practice, I can't tell the difference between the insulated versions and th e shunt fed versions. The shunt fed versions have so many advantages as to lightning protection, bandwidth and ease of tuneup, that I totally gave up on insulated systems years ago. The performance seems to be equal with respect to signal strength, so I don't argue with the poles. At these frequencies and with the available land around me, there isn't going to be much measurement to the 1/4 of a DB and playing with the things either! The QTH is way out in the middle of no where in the country, so the noise problem is greatly reduced from urban sites. For that reason I can't really pass a firm comment on it, but it seems that the shunt fed versions are far quieter for trash noise than the others as well. Mike as a guest at leviathan.tamu.edu From lwbyppp@epix.net Tue Jan 30 16:13:57 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!ns1.aplatform.com!pagesat.net!netserv.com!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!airwaves!rrb From: stobty@pacifier.com (Ty Stober) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.broadcasting,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap Subject: Larsen Antennas Job Posting Followup-To: poster Date: 26 Jan 1996 07:35:11 GMT Organization: Pacifier Internet Server (360) 693-0325 Lines: 38 Approved: rrb@airwaves.chi.il.us Distribution: world Message-ID: <4ea07f$9a7@vixen.cso.uiuc.edu> Reply-To: stobty@pacifier.com NNTP-Posting-Host: clm.aiss.uiuc.edu Originator: rrb@clm.aiss.uiuc.edu Xref: news.epix.net rec.radio.amateur.antenna:18725 rec.radio.amateur.digital.misc:13837 rec.radio.amateur.equipment:24298 rec.radio.amateur.homebrew:13018 rec.radio.amateur.misc:97443 rec.radio.amateur.policy:32853 rec.radio.amateur.space:6220 rec.radio.broadcasting:20257 rec.radio.cb:25972 rec.radio.noncomm:5126 rec.radio.scanner:44621 rec.radio.shortwave:69433 rec.radio.swap:56275 MARKET MANAGER - ANTENNA PRODUCTS Larsen Electronics is an internationally recognized supplier of quality antenna products for two-way communications. We are seeking an experienced Market/Product Manager for Amateur and Commercial antennas. Successful candidates will have in-depth experience in radio related products up to 800 MHz. Direct experience with LMR and Amateur markets is preferred. Bachelor92s degree in Business or Marketing, or extensive related business experience required. Position responsibilities include: Product line management, pricing, sales programs, new products, training, and technical support. This position will also include a competitive compensation, incentive, and benefits plan. Interested candidates may respond by forwarding a resume92 including income history to: Larsen Electronics, Inc. ATT: Human Resources Manager P.O. Box 1799 Vancouver, WA. 98668-1799 FAX: 1-360-944-7556 Pre-employment drug screen required. Larsen Electronics is an Equal Opportunity Employer. -- ------------------------------------------------------------------------- - ---- Pacifier Online Data Service Dialup SLIP/PPP User To register: (360) 693-0325 or telnet pods.pacifier.com ------------------------------------------------------------------------- - ---- From lwbyppp@epix.net Tue Jan 30 16:13:58 1996 Path: news.epix.net!news.sprintlink.net!zilker.net!halley!news.mpd.tandem.com!tandem!UB.com!wetware!wsrcc.com!news.orst.edu!news.cs.indiana.edu!news.nstn.ca!news From: nstn2527@fox.nstn.ca (nstn2527) Newsgroups: rec.radio.amateur.antenna Subject: Battle Creek Special Date: 26 Jan 1996 12:33:15 GMT Organization: NSTN Navigator User Lines: 5 Message-ID: <4eahmb$3mr@news.nstn.ca> Reply-To: nstn2527@fox.nstn.ca NNTP-Posting-Host: lawrencetown-ts-08.nstn.ca Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 I've heard several references to a wire antenna called the "Battle Creek Special". Has anyone any info on this antenna, how its constucted etc.? Les VE1WWH From lwbyppp@epix.net Tue Jan 30 16:13:59 1996 Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.mch.sni.de!Dortmund.Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news.ruhr-uni-bochum.de!news.uni-stuttgart.de!news.belwue.de!scsing.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!mr.net!news.mr.net!medtronic.com!usenet From: david.lipson@medtronic.com (David Lipson) Newsgroups: rec.radio.amateur.antenna Subject: Bazooka Antenna Design Date: 26 Jan 1996 18:26:56 GMT Organization: Medtronic Corporation Lines: 6 Message-ID: <4eb6dg$ske@gazette.medtronic.com> NNTP-Posting-Host: lpc-176.leads.brady.medtronic.com X-Newsreader: WinVN 0.90.5 Does anyone have a design for a Bazooka antenna? I'm told their good on 160 M. Thanks for the assistance. de N9PVF From lwbyppp@epix.net Tue Jan 30 16:14:00 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!uunet!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Why is man-made RFI vertically polarized? Date: 26 Jan 1996 18:48:22 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 27 Sender: root@newsbf02.news.aol.com Message-ID: <4ebp86$nd9@newsbf02.news.aol.com> References: <4e8qfj$ntn@fidoii.cc.lehigh.edu> X-Newsreader: AOL Offline Reader In article <4e8qfj$ntn@fidoii.cc.lehigh.edu>, lusgr@chili.CC.Lehigh.EDU (Stephen G. Roseman) writes: > > In the ARRL General Class study guide (and I've seen it other places) >is a statement the "man-made interference is usually vertically polarized". > > In 25 words or less, anyone know why? > >Thanks, >Steve, N3WHW One reason man-made RF is said to be predominately vertically polarized is because horizontally polarized components are attenuated much more rapidly, and so mostly the vertical components remain. Even though the polarization of sources are random, propagation effects filter out the horizontal components. The second reason is verticals generally accept radiation from all different directions, and have maximum response along the ground. Horizontal antennas have a null along the horizon and off the ends. So a vertical is an ideal collector of random local noise sources. 73 Tom From lwbyppp@epix.net Tue Jan 30 16:14:01 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!visi.com!news3.mr.net!mr.net!imci2!newsfeed.internetmci.com!howland.reston.ans.net!usc!newshub.csu.net!news.Cerritos.edu!news.Arizona.EDU!nemo.as.arizona.edu!hlester From: hlester@nemo.as.arizona.edu (Howard Lester) Newsgroups: rec.radio.amateur.antenna Subject: Re: Battle Creek Special Date: 26 Jan 1996 18:59:51 GMT Organization: University of Arizona, Tucson, AZ Lines: 12 Message-ID: <4eb8b7$fi2@news.ccit.arizona.edu> References: <4eahmb$3mr@news.nstn.ca> NNTP-Posting-Host: nemo.as.arizona.edu In article <4eahmb$3mr@news.nstn.ca> nstn2527@fox.nstn.ca writes: >I've heard several references to a wire antenna called the "Battle Creek >Special". Has anyone any info on this antenna, how its constucted etc.? > >Les VE1WWH > Wasn't that something like installing a loading coil inside a box of Rice Krispies? ;-) From lwbyppp@epix.net Tue Jan 30 16:14:02 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news.ysu.edu!news.cps.udayton.edu!news.engr.udayton.edu!blackbird.afit.af.mil!zombie.ncsc.mil!arlnews!lhc.nlm.nih.gov!crick.sura.net!lamarck.sura.net!newsfeed.internetmci.com!solaris.cc.vt.edu!usenet From: jbmitch@vt.edu (John Mitchell) Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Date: 26 Jan 1996 20:11:33 GMT Organization: Virginia Tech/Blacksburg Electronic Village Lines: 27 Message-ID: <4ebchl$gcv@solaris.cc.vt.edu> References: <4dkpnb$kuk@news-2.csn.net> NNTP-Posting-Host: as2511-11.sl014.cns.vt.edu Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <4dkpnb$kuk@news-2.csn.net>, wkleros@csn.net says... >So, to summarize my REAL question! At an elevation of 50 or 60 feet, how well might a one to two >wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 160 meters? Would >ground losses and reflections negate the benefits of using this type of antenna at a low height in >terms of wavelength? Anyone tried same? Hi Bill, I tried a Rhombic run thru the forest at 25-35 feet, 500 feet on each leg, and was very disappointed. IMHO, you sacrifice any gain developed to ground loss, unless you can get the antenna up out of ground effect (at least 50 feet). I would expect that you would do better with dipoles, inverted vees, wire beams, etc, below 50 feet, but don't expect to develop much gain in any particular direction at that height. I get good results with dipole /inv vees at 50 feet with a reflector directly UNDER them. Although this would appear to direct energy straight up, what I find is that they actually improve radiation overall by reducing ground losses. I space the reflector at about .10 wavelength and have worked a lot of dx with this setup. Works particularly well if your QTH has lossy ground, such as my mountainous terrain. 73, John From lwbyppp@epix.net Tue Jan 30 16:14:02 1996 Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!mn6.swip.net!plug.news.pipex.net!pipex!weld.news.pipex.net!pipex!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Solid dielectric coax Date: 26 Jan 1996 22:07:36 GMT Organization: Intel Corporation, Chandler, AZ Lines: 8 Distribution: world Message-ID: <4ebjb8$m76@chnews.ch.intel.com> NNTP-Posting-Host: cmoore.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Awhile ago someone posted a brand and type of coax that was equivalent to 9913 specs but was solid instead of hollow. I've forgotten what it was. Could some kind soul please repost. I'm looking for something short of hardline that is low loss, relatively low cost, and will stand the Phoenix 120 degree summers. thanks, 73, Cecil, KG7BK, OOTC (not speaking for my employer) actually, I am this tim e. From lwbyppp@epix.net Tue Jan 30 16:14:03 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!news.net99.net!news.burgoyne.com!pv1.burgoyne.com!nv7v From: nv7v@burgoyne.com (Steven Whitehead) Newsgroups: rec.radio.amateur.antenna Subject: Want: Source, flexible dual band ht ant Date: Fri, 26 Jan 1996 23:58:43 Organization: Burgoyne Computers Inc. Lines: 16 Message-ID: NNTP-Posting-Host: pv1.burgoyne.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] I use my HT constantly. Have had many problems with dual band antennas wearing out and breaking. Last ant was an ANLI and it broke off the center connector in the bnc. It took 4 hours to replace the connector because I could not get the old pin out. Does someone make a dual band ht antenna that is flexible all the way down to the connector i. e. does not have the solid plastic matching piece at the bottom. I tried Icom's ant that came on the 24 but the performance was worse than a 440 1/4 wave. Currently I ususally carry a scanner with me so I keep the 440 1/4 wave on the HT and switch it with the 2 mtr helical duckie when I need 2 meters. Thanks, Steve nv7v@burgoyne.com From lwbyppp@epix.net Tue Jan 30 16:14:04 1996 Path: news.epix.net!news.sprintlink.net!news.mcn.net!blpm01-172 From: vfiscus@mcn.net (Vince Fiscus, KB7ADL) Newsgroups: rec.radio.amateur.antenna Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ Date: Sat, 27 Jan 96 00:53:41 GMT Organization: Montana Communications Network Lines: 4 Message-ID: <4ebt3g$fkn@news.mcn.net> References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> NNTP-Posting-Host: blpm01-172.mcn.net X-Newsreader: News Xpress Version 1.0 Beta #4 Best Coax for CB is one that ends in a dummy load. From lwbyppp@epix.net Tue Jan 30 16:14:05 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w2foe@aol.com (W2FOE) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 27 Jan 1996 02:12:28 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 17 Sender: root@newsbf02.news.aol.com Message-ID: <4ecj8s$6ug@newsbf02.news.aol.com> References: <4e76fb$od1@news.tamu.edu> X-Newsreader: AOL Offline Reader Mike, there are two stations here on the east coast that may be able to offer you some help. Bruce, K01F, has a 4square on 80 meters with halfwave elements. At least he started with half waved, however, after a while he concluded that his elevation level was (would you believe) too low. I don't think he is using the array on 160, but I'm sure he has done some playing around with it. Fred, W1FC, has a similar set up which he designed specifically for 160 (1/4 wave elements on 160, with 1/8 wave spacing); and he does use the array extensively on 80 meters as well. I have no idea how he solved the matching problems. I'm sure either would be happy to talk about it. You can find either of them in the 3790 to 3800 window on a regular basis. I'm not on 160 at the moment so I don't know where or when Fred operates there. Regards, Merv From lwbyppp@epix.net Tue Jan 30 16:14:06 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!news.mathworks.com!news.kei.com!sundog.tiac.net!jmatk.tiac.net!user From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc Subject: TSCM Counter Surveillance & Technical Security Page Date: Sat, 27 Jan 1996 02:30:25 -0500 Organization: tscm.com Lines: 32 Message-ID: Reply-To: jmatk@tscm.com NNTP-Posting-Host: jmatk.tiac.net Keywords: Counterintelligence Debugging Surveillance Counter-Terrorism X-Newsreader: Yet Another NewsWatcher 2.1.3 Xref: news.epix.net rec.radio.shortwave:69300 misc.legal.computing:19725 comp.security.unix:24024 rec.radio.amateur.antenna:18676 rec.radio.amateur.equipment:24140 rec.radio.amateur.misc:97300 rec.radio.amateur.digital.misc:13783 Just got posted a new article on the REI OSCOR-5000, an excellent piece of test equipment for the TSCM industry. Also, check out our updated tool list. http://www.tscm.com/ http://www.tscm.com/tmde.html <--- TSCM Test Equipment http://www.tscm.com/tools.html <--- TSCM Hand Tools Coming Online This weekend, Marty Kaisers little black boxes, Winkleman NATO equipment, and borescopes from England. Upcoming Topics to watch for in Feb... Any interest?? Wired Microphones and Pinhole devices... tons of pictures The Computer Audio/Video Threat... tons of pictures Join us for a real world TSCM sweep... On a sweep... Feel free to suggest topics... =============================================================== James M. Atkinson "...Shaken, not Stirred..." TSCM.COM 127 Eastern Avenue #291 Gloucester, MA 01931-8008 URL: http://www.tscm.com/ E-Mail: jmatk@tscm.com =============================================================== The First, The Largest, The Most Popular, and the Most Complete TSCM Counterintelligence Site on the Internet =============================================================== From lwbyppp@epix.net Tue Jan 30 16:14:07 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 27 Jan 1996 09:14:29 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 21 Sender: root@newsbf02.news.aol.com Message-ID: <4edc05$b1f@newsbf02.news.aol.com> References: <4ecj8s$6ug@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com In article <4ecj8s$6ug@newsbf02.news.aol.com>, w2foe@aol.com (W2FOE) writes: > >Mike, there are two stations here on the east coast that may be able to >offer you some help. Bruce, K01F, has a 4square on 80 meters with >halfwave elements. At least he started with half waved, however, after a >while he concluded that his elevation level was (would you believe) too >low. I don't think he is using the array on 160, but I'm sure he has done >some playing around with it. > > I've had that problem on both 160 and 80 also. 1/2 wl verticals stink. I used my 160 tower on 80 by putting a parallel decoupling stub from the base up. I made the stub 1/4 wl on 80. Then the antenna acted like a 1/4 w on both bands. Much like a hygain hitower does. 73 Tom From lwbyppp@epix.net Tue Jan 30 16:14:09 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Ground Radials...? Date: 27 Jan 1996 09:19:03 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 48 Sender: root@newsbf02.news.aol.com Message-ID: <4edc8n$d3f@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Tom, In article , "Thomas W. Castle" writes: >I have read that the more radials you use the better. Untrue. The BC studies by Lewis Brown and Epstein showed the following points where most of the efficiency possible for a given radial length was reached for a 1/4 wl vertical: .137 wl long = 15 radials = 57% eff .274 wl long = 60 radials = 80.5% eff .412 wl long = 113 radials = 95% eff The longer the radials, the more you can use. But no point in going beyond those numbers! >been told to put multiple radials in the same trench. It will do **NO good** to put three different length wires (or even three same length wires) together in one trench. That's bad advice. > I was also told to put grounding rods >at the end of each wire and bond them together. Ground the far end? That will help if the radials are very short on the band you are using, but certainly not where they are more than .1 wl long. >To me this seems like over kill...? Not to mention a lot of digging. >I can see the idea of using part of a wave length to figure in the >ground wire length. The Question is : Do you need to figure them for >20, 40 & 80 like that for each band? If so how about 15 & 10 mtrs as >well? Not to mention the WARC bands..? When a radial is on or in the ground, or even very close to the ground, it is not very "resonant". If you don't believe this, lower your dipole down and lay it on the ground and measure the SWR and bandwidth. Radial resonance is *ONLY* important if the radials are elevated and there are very few radials in the elevated system. Expect the efficiency to be 50% or less if a small elevated resonant system is used. >from F.P.L. check the ground conductivity with a "Meggar". A 20' >ground rod gave a .5 ohm ground <1" solid brass rod x 20'>... That is almost meaningless for the RF performance. 73, Tom From lwbyppp@epix.net Tue Jan 30 16:14:11 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!holmes.sgate.com!jekyll.sgate.com!donovanf From: Frank Donovan Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: Sat, 27 Jan 1996 11:58:08 -0500 Organization: Southgate Internet Host Lines: 50 Message-ID: References: <4e76fb$od1@news.tamu.edu> <4e8l64$gb7@newsbf02.news.aol.com> <4e9t5r$slr@news.tamu.edu> NNTP-Posting-Host: jekyll.sgate.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4e9t5r$slr@news.tamu.edu> This is a clarification of the method that I successfully use to detune a tower located near (within a wavelength) a vertical antenna. When a tower is in the near field of a vertical antenna, inevitably a parasitic current will be induced into the tower by the vertical antenna. The tower and antenna form a parasitic array, and the intended radiation from the vertical antenna will be distorted, often severely. The approach I use to detune the tower -- by attaching a carefully selected horizontal wire to the tower -- is only one of many available detuning methods. It offers the advantage of wide bandwidth, and therefore non-critical adjustment. I will discuss only the horizontal detuning wire method. This approach cancels the net radiation from the tower by utilizing a horizontal "detuning wire" to force a current minimum at approximately the mid point of the tower height. The parasitic tower currents above and below this mid-point then produce minimal net radiation. First, determine where on the tower a horizontal wire can be attached. If you have horizontally polarized Yagis on the tower, you will want to place the wire well away from the Yagi, at least 1/4 wavelength above and/or below. The length of the detuning wire must be 1/2 wavelength at the operating frequency of the vertical MINUS the distance from the mid-point of the tower to the attachment point of the wire. For example: To minimize parasitic radiation from a 100 foot tower affecting a nearby 160 meter vertical, and the 100 foot tower has a triband beam at the top, you elect to attach a horizontal detuning wire 80 feet up the tower. To determine the required length of the detuning wire, first subtract half the height of the tower (50 feet) from the height of the detuning wire attachment point (80 feet) for a result of 30 feet. The required detuning wire length is 1/2 wavelength (270 feet on 160 meters) minus 30 feet for a required detuning wire length of 240 feet. Now, having said all of this, by far the best way to select the detuning wire length (other than detailed pattern measurement!) is to use an antenna modelling program, such as EZNEC. Model the tower and its attached antennas and metallic guys (if not broken up with insulators), and the nearby vertical antenna. The model will show the pattern distortion affecting the vertical antenna. You can now add the horizontal detuning wire to the model and select the optimum length by minimizing the net pattern distortion. 73! Frank W3LPL From lwbyppp@epix.net Tue Jan 30 16:14:12 1996 Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!goanna.cs.rmit.EDU.AU!news.apana.org.au!panther.apana.org.au!news From: CandyMAN Newsgroups: rec.photo.equipment.medium-format,rec.photo.equipment.misc,rec.photo.film+labs,rec.photo.marketplace,rec.photo.misc,rec.photo.technique.art,rec.photo.technique.misc,rec.photo.technique.nature,rec.photo,technique.people,rec.ponds,rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb Subject: Re: ***KEYBOARD RECORDERS*********************************************** Date: 27 Jan 1996 12:42:27 GMT Organization: AARDVARK Internet - Melbourne Australia Lines: 4 Message-ID: <4ed6jj$e54@panther.apana.org.au> References: <4dmb8v$v6@ixnews8.ix.netcom.com> NNTP-Posting-Host: dialup-15.aardvark.apana.org.au Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: news.epix.net rec.photo.equipment.medium-format:1266 rec.photo.equipment.misc:1067 rec.photo.film+labs:617 rec.photo.marketplace:27166 rec.photo.misc:36722 rec.photo.technique.art:442 rec.photo.technique.misc:525 rec.photo.technique.nature:590 rec.ponds:6513 rec.puzzles:54128 rec.puzzles.crosswords:4946 rec.pyrotechnics:40002 rec.radio.amateur.antenna:18681 rec.radio.amateur.equipment:24151 rec.radio.amateur.misc:97312 rec.radio.amateur.policy:32765 rec.radio.amateur.space:6201 rec.radio.cb:25904 Do we REALLY need to see this type of thing in rec.pyrotechnics?!?!? From lwbyppp@epix.net Tue Jan 30 16:14:13 1996 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: All spammers please read was (Re: WI Hams Please read! Message-ID: <1996Jan27.133555.1413@ke4zv.atl.ga.us> Summary: Use your Distribution attribute properly. Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ecli3$elt@hummin.sol.net> Date: Sat, 27 Jan 1996 13:35:55 GMT Lines: 43 Xref: news.epix.net rec.radio.amateur.antenna:18683 rec.radio.amateur.misc:97319 rec.radio.amateur.policy:32769 In article <4ecli3$elt@hummin.sol.net> garyk9gs@solaria.sol.net (Gary Schwartz ) writes: >If you don't live in Wisconsin, please excuse the bandwidth. There would be no need to ask our pardon if you'd properly set the Distribution header line in your message. The reason the Distribution attribute exists is so that messages of only local interest can be limited in distribution to only the local area. If you leave it blank, as I have in this posting, the default distribution is *world*. But there's no reason to leave it blank if your message is intended for a smaller audience. Each area has its local distribution codes, state codes, regional codes, country codes, and the default of world. If you don't know the proper distribution coding to use, ask your sysop. There's no use wasting the entire world's time with, for example, an announcement of your local BBS number in Los Angeles when a distribution of LA would limit it to only those who might care. Same with notices of exam sites for a locale, IE exam notices for Southern California should have a distribution attribute of SoCAL. And the same goes for the president of my local club who recently spammed the world about an event that should have been limited to an ATL distribution (or at most to a GA distribution). There's no good reason to spam the net when the tool to prevent that is available to you in *every message header*. It's just good nettiquette. In the proximate case, there was enough of non-local interest in your post to justify the "world" distribution (or at least a USA distribution), but because that's true, you needn't beg forgiveness for using the bandwidth. Sorry to seem to be singling you out for this lecture, but yours is just the most recent of a number of posts of this nature. Please everyone, use the Distribution attribute properly for locale specific postings. If you don't know how, ask your provider. If he tells you his system won't permit it, demand he fix his system. Every usenet message has a Distribution attribute in the header, and every system has to have a way to set it to some value. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Jan 30 16:14:14 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: rpmarkey@nbn.NET (Rick Markey) Newsgroups: rec.radio.amateur.antenna Subject: Re: Ham-Ant Digest V96 #29 Date: 27 Jan 96 14:21:06 GMT Organization: ucsd usenet gateway Lines: 16 Message-ID: <199601271421.GAA19642@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu >Date: 23 Jan 1996 16:13:05 GMT >From: nstn2527@fox.nstn.ca (nstn2527) >Subject: Thru Tinted Glass Ants. > >I've heard that thru-glass mobile antennas do not work so well on tinted >automobile windows. Anyone have any info on this? > >Les VE1WWH A regular tinted window is OK. I understand, however, that some forms of tinted windows use some metal in them which would be a problem. Unfortunately, I don't know how to tell the difference. de Rick Markey, KN3C From lwbyppp@epix.net Tue Jan 30 16:14:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: dcimp@aol.com (DCimp) Newsgroups: rec.radio.amateur.antenna Subject: Syntor Manual Date: 27 Jan 1996 14:43:07 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <4edv8b$h8e@newsbf02.news.aol.com> Reply-To: dcimp@aol.com (DCimp) NNTP-Posting-Host: newsbf02.mail.aol.com I need a Syntor Manual for VHF, prefer the 136-150 Split, but any VHF will do, Not the Syntor X, or the Syntor X9000, just plain Syntor thanks DCimp@AOL.Com From lwbyppp@epix.net Tue Jan 30 16:14:17 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!newsrelay.netins.net!news.netins.net!usenet From: crcarlson@netins.net Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Vertical Antenna Date: 27 Jan 1996 18:27:36 GMT Organization: INS Information Services, Des Moines, IA USA Lines: 67 Message-ID: <0099D03B.87646374@netins.net> References: <4e0vvv$g8c@soap.news.pipex.net> <3104E8C5.1290@aol.com> <31060B3E.DA2@aol.com> Reply-To: crcarlson@netins.net NNTP-Posting-Host: ins.netins.net In article <31060B3E.DA2@aol.com>, Jeff Blumenfeld KB3DX writes: >Subj: Re: GAP Titan DX Vertical Antenna >Date: Wed, Jan 24, 1996 4:32 AM EDT >From: pmarkham@sun.lssu.edu >X-From: pmarkham@sun.lssu.edu (Peter C. Markham) >To: jeffreyblu@aol.com > >>I just bought one of those myself, but haven't put it up yet, due to >>the weather. The GAP folks (as I guess you know) say you can mount >>it either about 8' off the ground on a metal pipe, or at rooftop, >>with no difference in performance. I'd be interested in hearing >>your experience with its performance. > > I made the mistake of purchasing the Titan, after seeing it at the Dayton, >94 hamfest. I mounted it on a the roof of a single story wood frame building >with the counterpoise? 36" above the peak of the roof, 22 ft. above ground. > > I used my FT-890, the Titan switched direct, and the 80m dipole, straight, >at 33ft with balanced feed switched through an MFJ-949B tuner, for the >following observations. Only on 40m did it perform better than my 80m dipole >at 33ft, at low angles, < 10 degrees, in most directions. 40m at >10 degrees >it was consistently down in all directions except a small sector off the ends >of the dipole, where it was 1 to 2 S units better. On 30m it was down by 2 S >units, compared to the dipole in the directions of least difference between >the two antennas. On 7, 14, 18, 21, 24 and 28 mhz it was down > 1/2 S unit at >all az and el angles with very few exceptions. On 80m the performance was dow n >1 to 2 S units, in general, but given the antenna's space requirements and >physical length, I consider its performance acceptable. > > I used an MFJ-202 noise bridge to get an idea of ant Q, resonance and band >width. On 30m the resonance was 400khz high. On the other bands, it was >sufficiently close that operating environment/assembly, may have been >responsible for the errors noted. The Q was quite high and narrow on the high >end of 80m, exactly where it should have been for the capacitor used and >required on that band. As a general observation the other bands had an antenn a >Q quite low and broad, which troubled me, bringing to mind the characteristic s >of a dummy load. > > (Lots of stuff edited here to save space) > > I submit that the same characteristics exhibited by the antenna at 2 >different locations is probably a consequence of design, barring some >subtle assembly mistake I made, assembling the antenna twice, with meticulous >care, by the book. I accept that my empirical methods may not hold up under >the scrutiny of perfectionists. I have no doubt of the general differences in >operating characteristics of the 2 antennas compared. I have no doubt about >the general antenna characteristics observed with the noise bridge and >spectrum analyzer. I have made my way through life as a generally competent >electronic technician who thinks about what he does, and despises wild a-- >guesses. > > For the better part of the last 9 months, I have been using it with a Come t >duplexer as an BCB/SW antenna for listening only, and as a 2 meter antenna fo r >local work. SWR on 146 is 1.6:1 > > Yes, I have buyer's remorse. :-) > > Pete, wa4hei Pete: Thanks for one of the rational and cogent posts that I have run across on this newsgroup since I subscribed! The "GAP controversy" has certainly sparked a lo t of comment. Yours is a very acceptable, (IMHO) analysis of the relative merits of this product. You used tools and made observations that the "average ham", mea ning me, can understand and reproduce. Now, can you get your hands on some of the other "radial-less" verticals to ma ke some comparison? ;_) 73 de WB0FDJ. QTH northern Iowa. 40 & 20 c.w./QRP From lwbyppp@epix.net Tue Jan 30 16:14:18 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!brutus.bright.net!chi-news.cic.net!uwm.edu!homer.alpha.net!daily-planet.execpc.com!earth!n9yjz From: n9yjz@earth.execpc.com (Joseph Moschella) Newsgroups: rec.radio.amateur.antenna Subject: WI Hams Please read! Date: 28 Jan 1996 02:52:00 GMT Organization: Exec-PC Lines: 9 Message-ID: <4eeocg$4pk@daily-planet.execpc.com> NNTP-Posting-Host: earth.execpc.com X-Newsreader: TIN [version 1.2 PL2] Just as a footnote to Gary's letter, It's also possible to reach the members of the Legislature by e-mail. I'm not sure how often they check it, but the two lists for the Senators and the Representatives addresses can be found at "http://badger.state.wi.us/agencies/wilis/leginfo/inetmail.html" 73's Joe Moschella, N9YJZ Brookfield, WI 53005 From lwbyppp@epix.net Tue Jan 30 16:14:19 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.orst.edu!engr.orst.edu!rutgers!venus.sun.com!cs.utexas.edu!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack From: mack@ncifcrf.gov (Joe Mack) Subject: Re: Testing co-axial filter Message-ID: Organization: Frederick Cancer Research and Development Center References: Date: Sun, 28 Jan 1996 03:14:34 GMT Lines: 49 In article alf@kaiwan.com (Alfred Lee) writes: > >Greetings. > >Many hams living in the metropolitans are having inter-mod problem with >outside antenna in the VHF and UHF bands. I am wondering if anyone >has tried using filter made from l/4 lines to filter strong out of >band signals. It's done all the time with coaxial cavities, to make duplexers for repeaters for instance where you need to reject a signal 600kc away on 2m. These are overkill for your needs. A single cavity using the design which (I think) is in the ARRL manual is plenty. People dont make filters out of coax cable and I don;t know why. I expect the Q is not very high, but to differentiate between 144 and 154MHz I don';t think you'd need that much Q. > >What I have in mind is to insert two open l/4 (electrical length) >transmission line stubs in series to the centre conductor and the shield. >Then parallel two shorted l/4 stubs from the centre conductor to the >shield at both end of the first two stubs. > >I wonder what kind of insertion loss would result and what kind of >attenuation can be achieved, say 154 MHz for 2 meter band. Also how >may we test for insertion loss and attenuation using average hams' >equipment. I spent a lot of time trying to do this sort of thing and wound up very disheartened. You 've got to do it the same way the professionals do it - with a network analyser. I'm afraid it's very hard to be a pure "amateur" and got a whole lot done. Somethings need more than and SWR meter and a multimeter. Joe NA3T mack@ncifcrf.gov > >73, > >--- >Alfred Lee alf@kaiwan.c om >KE6KGV 'The answer is (e^iă + 1) ? "No" : "Yes"' From lwbyppp@epix.net Tue Jan 30 16:14:20 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: Jack Ray Newsgroups: rec.radio.amateur.antenna Subject: High Quality Dipole Antennas Date: 28 Jan 1996 05:33:32 GMT Organization: MindSpring Enterprises, Inc. Lines: 11 Message-ID: <4ef1rc$11ta@stealth.mindspring.com> NNTP-Posting-Host: k4mzw.mindspring.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) I am Distributor for the Fritzel antenna line from Germany. Fritzel builds very high quality Beams and Dipoles, like nothing else on the m arket. These are available from your favorite dealer or direct: Electronic Switch Company, Inc. 8491 Hospital Drive, Suite 328 Douglasville, GA 30134 USA From lwbyppp@epix.net Tue Jan 30 16:14:21 1996 Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!feenix.metronet.com!news From: ken brookner Newsgroups: rec.radio.amateur.antenna Subject: Re: MFJ SWR Analyzers - Any users? Date: Sun, 28 Jan 1996 09:01:36 -0600 Organization: Texas Metronet, Inc (login info (214/705-2901 - 817/571-0400)) Lines: 23 Message-ID: <310B8FD0.1B376A91@metronet.com> References: <4dbe97$gnt@crusher.ici.net> <4dkpgd$8cc@kodak.rdcs.Kodak.COM> <1197cc$112a1c.14@luzskru.cpcnet.com> NNTP-Posting-Host: fw36.metronet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (X11; I; Linux 1.2.13 i486) Dave Mann wrote: > > RE: MFJ-259 SWR Analyzer ... Our friend K8MFO brought one with him to > VP2E a couple of months ago and is was GREAT! I used it to sort > through all kinds of pieces of damaged and undamaged coax, several > yagi antennas, 3 verticals, discovered my R7 was mistuned, tested and > retuned a 160 meter dipole, and did about 3 or 4 2 meter anteannas. > All in about 4 days. This was terrific help to us, after Hurricane > LUIS managed to blow everything down and around. If I had the money, > you can be SURE I would buy one of the MFJ Analyzers. I had never > used one before, and it took me about 10 seconds to figure out how to > use it. Also, without reading the instructions, figured out how to > test coax with a dummy load at one end, and all kinds of other great > stuff. Hats Off to MFJ! > > best 73's > Dave, VP2EHF > Dorothea, VP2EE > Little Harbour, Anguilla, British West Indies agreed! saves lots of time. kenb, n5lpi From lwbyppp@epix.net Tue Jan 30 16:14:22 1996 Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet From: Hank Blackstock Newsgroups: rec.radio.amateur.antenna Subject: Re: Transformer for Screwdriver type antenna Date: 28 Jan 1996 13:33:08 GMT Organization: IONet Lines: 13 Message-ID: <4eftuk$jad@ionews.ionet.net> References: <1187cc$62d0.2a9@luzskru.cpcnet.com> NNTP-Posting-Host: osip09.ionet.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 32bit) To: gmfoster@cpcnet.com gmfoster@cpcnet.com (Garry Foster) wrote: >I hear that Don Johnson and others are now recomending a matchinng >transformer at the base of this antenna instead of the matching >capicators. I can't imagine what the advantage would be. capacitors, are cheap, simple and effective. I have used them for years on my screwdriver antenna. (my own design with 3.5 inch coil). someone please enlighten me as to the advantage. 73 Hank From lwbyppp@epix.net Tue Jan 30 16:14:23 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.mtu.edu!news.mtu.edu!not-for-mail From: cmlong@mtu.edu (mike) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.antenna Subject: Special Events Station!!! Date: 28 Jan 1996 17:04:14 -0500 Organization: Michigan Technological University Lines: 50 Message-ID: <4egrsu$rmm@techsrv1.tech> NNTP-Posting-Host: techsrv1.tech.mtu.edu X-Newsreader: TIN [version 1.2 PL1] Xref: news.epix.net rec.radio.amateur.equipment:24230 rec.radio.amateur.homebrew:12991 rec.radio.amateur.misc:97371 rec.radio.swap:56161 rec.radio.amateur.digital.misc:13813 rec.radio.amateur.policy:32810 rec.radio.amateur.space:6209 rec.radio.amateur.antenna:18699 Thank-you for reading this. My name is Michael Long (KB8WPE) and I am the Public Relations Manager for the Husky Amateur Radio Club (HARC) whose callsign is W8YY. The club is located on the Michigan Technological University campus. Starting on February 1, 6am EST, and continuing on until February 3, 6am EST, W8YY will be running a Special Events station for Michigan Tech's Winter Carnival '96. The frequencies listed below are the most likely place we will be operating. For this Special Events station we have 8"x11" certificates that would look great on anyones' wall! All you have to do is contact us and then send a QSL with a self addressed stamped envelope to receive the certificate. Here are the frequencies: Band Frequency Mode Time 160m 1.90 MHz LSB 8pm-8am 75m 3.90 MHz LSB 10pm-8am 40m 7.25 MHz LSB 7pm-10pm 20m 14.250 MHz USB majority of the day (8am-7pm) 17m 18.150 MHz USB if open 8am-7pm 15m 21.350 MHz USB if open 8am-7pm 10m 28.40 MHz USB if open 8am-7pm 2m 144.2 MHz USB All the time 146.58 MHz FM All the time 70cm 432.100 MHz USB All the time Again, thank-you for reading this message and all of us here hope to here from you during the Special Events station! For any more info. email me at cmlong@mtu.edu or the Club President, Dave Gillahan, at dmgillah@mtu.edu You can also check out our homepage at http://techsrv1.tech.mtu.edu:8080/harc.html Though it is just beginning it does have a little information on it. Sincerely, Mike Long -KB8WPE- -- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \ Michael Long || Public Relations Manager / / Callsign: KB8WPE || for HARC (W8YY) \ \ Email: cmlong@mtu.edu || Email: harc-l@mtu.edu / / Phone: (906)487-5664 || Majors: EET and EMT \ \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ From lwbyppp@epix.net Tue Jan 30 16:14:24 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!uunet!in1.uu.net!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!cjpratsj From: cjpratsj@aztec.asu.edu (CAMILLE J. PRAT, SJ) Newsgroups: rec.radio.amateur.antenna Subject: covenants and antenna restrictions Date: 28 Jan 1996 20:06:55 GMT Organization: Arizona State University, Tempe, AZ (USA) Lines: 18 Message-ID: <4egl0v$d71@news.asu.edu> Reply-To: cjpratsj@aztec.asu.edu (CAMILLE J. PRAT, SJ) NNTP-Posting-Host: aztec.asu.edu A QST -- Lately, some posters have asked for info about actions regarding antenna restrictions. I know I've seen some specific cases somewhere, but forgot to mark where. (Hope others learn from this mistake!) For the interested, some info is available at this URL: http://www.accessone.com/~vbook/hronline.htm Once you're in, click the "Ham Radio On-Line Library" and look for "Complete Formatted PRB-1 text concerning Antenna Ordinances". This is general information and somewhat heavy reading, but at least it's solid and a start.... Hope this helps ---- Camille Prat KB7LBN cjpratsj@aztec.asu.edu -- From lwbyppp@epix.net Tue Jan 30 16:14:25 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!yuma!holly.ACNS.ColoState.EDU!drranu From: drranu@holly.ACNS.ColoState.EDU (Emarit Ranu) Newsgroups: rec.radio.amateur.antenna Subject: Re: Why is man-made RFI vertically polarized? Date: 28 Jan 1996 21:08:05 GMT Organization: Colorado State University, Fort Collins, CO 80523 Lines: 30 Message-ID: <4egojl$2qki@yuma.ACNS.ColoState.EDU> References: <4e8qfj$ntn@fidoii.cc.lehigh.edu> <4e98jh$2t4@Jupiter.mcs.net> NNTP-Posting-Host: holly.acns.colostate.edu X-Newsreader: TIN [version 1.2 PL2] Gary Myers (gmyers@mcs.com) wrote: : Gauss' law requires that the electric field must always be : perpendicular to a conductor. Since manmade rfi usually arrives by : ground wave (as opposed to skip), the electric field is perpendicular : to the conducting earth, i.e., vertically polarized. Actually Gauss' Law for electric fields states that the electric flux through any close surface equals the charge enclosed (remeber the closed integral around a surface of the scalar product of flux denisty and differential surface is equal to Q enclosed). Conversely Gauss' Law states nearly the same for magnetic quantities except the quanty of the intergal is zero (no such thing as a magnetic charge). Where the electric flux density D is replaced by the magnetic flux density B. Maxwell's equations state the same thing by use of the del operator. : Ok, ok, that's more than 25 words... : Gary K9CZB : gmyers@mcs.com -- -Emarit, KG0CQ 73's drranu@holly.ColoState.EDU Electrical Engineering, Colorado State Univeristy Packet: KG0CQ@KF0UW.#NECO.USA.NOAM All generalizations are bad. Censorship: ###### _._ __. _____ _._. __._ From lwbyppp@epix.net Tue Jan 30 16:14:26 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail From: mbstone@crl.com (Michael Stone) Newsgroups: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy Subject: Re: TSCM Counter Surveillance & Technical Security Page Followup-To: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy Date: 28 Jan 1996 21:13:08 -0800 Organization: CRL Dialup Internet Access Lines: 19 Message-ID: <4ehl14$sep@crl11.crl.com> References: NNTP-Posting-Host: crl11.crl.com X-Newsreader: TIN [version 1.2 PL2] Xref: news.epix.net rec.radio.scanner:44567 rec.radio.shortwave:69400 misc.legal.computing:19838 comp.security.unix:24081 rec.radio.amateur.antenna:18708 rec.radio.amateur.equipment:24256 rec.radio.amateur.misc:97399 rec.radio.amateur.digital.misc:13821 rec.radio.amateur.homebrew:12997 rec.radio.amateur.policy:32827 James M. Atkinson, Communications Engineer (jmatk@tscm.com) wrote: : Here is the current list of frequencies used for bugging, technical : surveillance and similar activities. : Outband Equipment : ANY Television broadcast or Cable TV frequency : ANY FM radio broadcast frequency : ANY Paging or Beeper frequency : ANY Cellular Telephone frequency : Keep in mind that the federal government can use virtually any : frequency between DC and light. : Summary (this will catch 99.99% of all Non-Intell/Diplomatic RF bugs) Gee whiz. From lwbyppp@epix.net Tue Jan 30 16:14:27 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: dickmac@ix.netcom.com (Richard MacDonald) Newsgroups: rec.radio.amateur.antenna Subject: Re: Inverted V or long wire? Date: Sun, 28 Jan 1996 22:06:50 -0700 Organization: Netcom Lines: 24 Message-ID: <4ehkld$buo@ixnews4.ix.netcom.com> References: <1771BA38ES86.TJB94002@UConnVM.UConn.Edu> NNTP-Posting-Host: ix-den6-20.ix.netcom.com X-NETCOM-Date: Sun Jan 28 9:06:53 PM PST 1996 X-Newsreader: Forte Agent .99b.112 On Sat, 27 Jan 96 11:37:50 EST, TJB94002@UConnVM.UConn.Edu wrote: >I don't have my ticket, but I am listening mostly on 80M using a 160' piece >of wire strung from my basement window through the trees about 8' high. I am >considering putting up an inverted V at about 50' then moving to a full dipol e. >Is it worth the effort for listening? The long wire runs east to west. Are th er >there any easy tuner circuits that can improve the long wire performance? I a m >listening on an HW101. >Thanks. I've never had any reason to go from an inverted V to a "full dipole." All of the inverted V's that UI have had were full dipoles but were shaped to match 5 0 ohm coax. I don't believe there is any real advantage to a flat dipole over th e V. A tuner will help a bit but not as much as a higher tuned antenna with some radials. For DX listening a vertical may work well also because of better low angle response. If you want directionality, you could even try a rhombic. Now that would take lots of space and give much improvement in one direction... Actually the last is somewhat kidding but I do wish I had the space for one. Dick - AD0J From lwbyppp@epix.net Tue Jan 30 16:14:29 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: Testing co-axial filter Date: 28 Jan 1996 23:38:22 GMT Organization: Hewlett Packard Corvallis Site Lines: 59 Message-ID: <4eh1de$svn@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Joe Mack (mack@ncifcrf.gov) wrote: : I spent a lot of time trying to do this sort of thing and wound up : very disheartened. You 've got to do it the same way the professionals : do it - with a network analyser. : I'm afraid it's very hard to be a pure "amateur" and got a whole : lot done. Somethings need more than and SWR meter and a multimeter. I'd like to offer a slightly different viewpoint. I have network analyzers available, and yes, they are certainly nice to measure what you have put together and to tune up adjustments. But---if you don't start with a _design_ then you will have a terrible time getting the performance you want. The design part, for me, must include an understanding of several things including the materials and components I'm working with and what happens when you arrange things in different ways. In the case of a filter built from transmission lines, for example, I'd split the problem into parts. For a filter with particular characteristics, I know it can be done with certain "poles" and "zeros", mathematical abstractions if you will, and that I can realize practical poles and zeros with resonators, and that a stub of coaxial cable can be a resonator. Furthermore, I know that in the completed design, the poles will have associated "Q" factors -- loaded Q. And I know that the unloaded Q of each resonator must be higher than the loaded Q, and that the ratio of the loaded to unloaded Q will tell me how much loss the resonator has. And for a given coaxial cable I can pretty easily tell you the unloaded Q when using it as a resonator. I think one of the big problems folk get into when they try to just connect some pieces of transmission line to make a filter is that they end up with very poorly controlled couplings among the resonators, and as a result end up with filters with very strange frequency responses. That's assuming you just toss things together thinking "this will look like a short here or an open here..." You have very little insight into either the loaded or unloaded Q of the resonators. If you don't design your filter before you put it together, you are sure likely to need a network analyzer to get even close to the desired results. But if you design it and assemble it carefully, the analyzer will be needed only as a check or for a small tweak in tuning. OK, so let's take a quick peek at using transmission lines for filtering... Consider a line like foam-RG-8 type with a velocity factor of .8 and an attenuation of 2dB/100 feet. At 2 meters, if I did my math right, the unloaded Q of a resonator made from this line would be about 260. Now why would I want to use a 16" piece of this line to make a resonator with that Q, when I could just as well wind a coil half an inch in diameter and half an inch long and get just as high a Q? Or, by making a helical resonator in a short piece of 1" copper pipe, I can end up with an unloaded Q of about 500, and get half the loss as if I used the transmission line. And if I want bandwidths on the order of 1.5MHz at 150MHz, I'll need loaded Q's of 100 for the simplest filters and quite a bit higher for higher order filters. So the very first step in a _design_ tells me that coaxial cable is probably NOT the way to implement the resonators I'll need. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Tue Jan 30 16:14:31 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet From: mlazaroff@delphi.com Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Antennas Date: Mon, 29 Jan 96 01:15:47 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 12 Message-ID: References: <4dfj24$7rm@ixnews2.ix.netcom.com> NNTP-Posting-Host: bos1g.delphi.com X-To: Kory Hamzeh Hi Scott, I've used the GAP Voyager for a few years (since it first came out). I don't care what the others say. It's a fantastic antenna for 80 and 40. Easily worked the world with it and always received outstanding signal reports. Granted, it's not great on 160 but it is usable there and it was OK for my operation. I'm very happy with it. Only "criticism" is that the factory's guying recommendations are too optimistic - it's not real stable unless you guy it significantly better than the directions tell you. However, the antenna *is* a great performer. 73, Mike KB3RG/CU3LF/CU0WPX From lwbyppp@epix.net Tue Jan 30 16:14:31 1996 Path: news.epix.net!news.sprintlink.net!news.qnetix.ca!usenet From: academie@saglac.qc.ca (Académie du Savoir) Newsgroups: rec.radio.amateur.antenna Subject: Re: Help calculating transmission power Date: Mon, 29 Jan 1996 02:36:21 GMT Organization: Qnetix Networking Group Lines: 23 Message-ID: <4ehf8e$bhl@shadow2.qnetix.ca> NNTP-Posting-Host: 204.19.37.63 X-Newsreader: Forte Free Agent 1.0.82 |----(-------------------------------------------------------------10 km------ --------------------------------------------->)----| | | | frequency=10 Ghz | | | | | | | ___ ___ Transmitting Receiving Gain= 10db Gain=40 db What is the transmitting power if the signal is recieved at -80 dBm? Please give me an answer in dBm and in Watts Thanks is advance, an answer would be very welcomed P.S. If you could answer before monday 29 4 p.m. it would be great Brad Wilson Canada From lwbyppp@epix.net Tue Jan 30 16:14:32 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!chi-news.cic.net!newsfeed.internetmci.com!uwm.edu!newsspool.doit.wisc.edu!news.wisc.edu!lumkes From: lumkes@cae.wisc.edu (John Lumkes) Newsgroups: rec.radio.amateur.antenna Subject: Yagi design and tuning ?'s Date: 29 Jan 1996 03:16:34 GMT Organization: College of Engineering, Univ. of Wisconsin--Madison Lines: 17 Message-ID: <4ehe6i$25f2@news.doit.wisc.edu> NNTP-Posting-Host: hp-27.cae.wisc.edu I just built a Yagi using the design software packaged with the latest antenna handbook. Question is this: I design it for a center frequency of 146 but when I tune it I get a perfect match at 144 MHz. I built a T-match with a 4:1 coaxial balun. (6-ele). I started shortening the driven element but the perfect match seemed to still occur around 144. Before I shorten the DE more, what is the correlation between the surrounding element lengths as far as tuning freq. is concerned? Should I just keep shortening the DE and a assume the design software is correct for the other element lengths or will shortening the DE not produce the desired effect. Do I need to shorten all the elements to produce a good match at a slightly higher frequency? (Non-conducting boom, 3/8" dia alum. ele) Welcome any hints and insights, Thanks alot, John Lumkes AA9QP lumkes@cae.wisc.edu From lwbyppp@epix.net Tue Jan 30 16:14:34 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!news.uwa.edu.au!newsman.murdoch.edu.au!usenet From: howse@cleo.murdoch.edu.au (Walter Howse) Newsgroups: rec.radio.amateur.antenna Subject: Re: GPS antenna designs needed Date: 29 Jan 1996 03:41:26 GMT Lines: 24 Message-ID: <4ehfl6$gqj@newsman.murdoch.edu.au> References: <4e253u$ebp@newsflash.hol.gr> NNTP-Posting-Host: cleo.murdoch.edu.au Mime-Version: 1.0 X-Newsreader: WinVN 0.99.2 In article <4e253u$ebp@newsflash.hol.gr>, douglasbraun@hol.gr says... > >I've been looking for a couple of years for a GPS auxillary antenna >project, and the best I've seen was a patch antenna in last October's QST. >It was a very good article, but I haven't had a change to build it... I have built two of them for my Magellan Trailblazer and am delighted with the results. 73 Wal -- ========================================================================= = Dr Walter J Howse | howse@cleo.murdoch.edu.au 4 Renton St | Phone + 61 9 317 2967 Melville | Fax + 61 9 317 3113 WA Australia 6156 | Amateur Radio Station VK6KZ located OF77vw Local time UTC + 8 ========================================================================= = From lwbyppp@epix.net Tue Jan 30 16:14:34 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: aa4nu@raider.raider.NET (Bill W. Cox [AA4NU]) Newsgroups: rec.radio.amateur.antenna Subject: Feedback on Sommer XP-series Yagis ??? Date: 29 Jan 96 05:44:13 GMT Organization: ucsd usenet gateway Lines: 21 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Interested in some "real-world" feedback regarding Sommer (DJ2UT) antennas. Is this a popular antenna in the EU market ? Best features are ? How well do they perform as compared to the Cushcraft/Hygain/KLM/Mosley styled "xxxxx-banders" ? Best bands ? Worst bands ? Any interaction problems with other nearby antennas ? Reliable mechanically and electrically ? Problem areas ? Product reviews been written ? Customer support ? Anyone run this thru EZNEC or similar ? Please respond here so all interested may learn, or via my 'address' if you wish for your comments to remain private .... 73 es TU ! de Bill AA4NU (aa4nu@raider.raider.net) From lwbyppp@epix.net Tue Jan 30 16:14:35 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsxfer2.itd.umich.edu!chi-news.cic.net!usc!math.ohio-state.edu!cs.utexas.edu!news.ti.com!usenet From: Joe Fitter BV/N0IAT Newsgroups: rec.radio.amateur.antenna Subject: Re: need info: 5/8 wave 2m/70cm antenna Date: 29 Jan 1996 10:32:24 GMT Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C. Lines: 14 Message-ID: <4ei7no$7dm@tilde.csc.ti.com> References: <4e3l0k$pri@linus.mitre.org> <4e7gnr$ab0@ixnews7.ix.netcom.com> NNTP-Posting-Host: 137.167.36.115 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) COMET AND DIAMOND BOTH MAKE 1/2 WAVE ANTENNAS FOR VHF AND UHF (DUAL BAND CONFIGURATION IN SOME CASES). Oops...sorry for the caps. The 1/2 wave design requires no ground plane, since the body of your 'vette is likely fiberglass. They make a low profile type antenna that can handle about 75 watts of FM rf, uses a standard PO mount etc. I have seen this antenna mounted on a small bracket that protrudes out from underneath the bumper of the car. The antenna bracket is made from stock 1/8 inch aluminum and is bolted to underside of the car. No need for adequate grounding, since it's a 1/2 wave antenna. Joe From lwbyppp@epix.net Tue Jan 30 16:14:36 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Antennas Date: 29 Jan 1996 11:18:30 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 9 Message-ID: <4eiae6$2fj0@info4.rus.uni-stuttgart.de> References: <4dfj24$7rm@ixnews2.ix.netcom.com> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >However, the antenna *is* a great performer. Mike, your success is more the result of your operating procedures than of the antenna performance. Comparisions have shown that it is beat by 1 - 2 S-points by a simple dipole at the same height. 73, Moritz DL5UH From lwbyppp@epix.net Tue Jan 30 16:14:37 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.mindspring.com!sco.mindspring.com!sco From: sco@mindspring.com Newsgroups: rec.radio.amateur.antenna Subject: HELP: Longwire Ant for FT-840 Date: Mon, 29 Jan 1996 12:17:42 -0400 Organization: MindSpring Enterprises, Inc. Lines: 6 Message-ID: References: NNTP-Posting-Host: sco.mindspring.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B] >I want to run a long wire antenna for my Yaesu FT-840 to cover the SWL and HA M >bands. Do I need a tuner with the wire? Can I make the wire any length that i s >practical. From lwbyppp@epix.net Tue Jan 30 16:14:38 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!mr.net!news.mr.net!dawn.mmm.com!news From: grhosler@mmm.com (Gary Hosler - KN0Z) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Subject: Re: All spammers please read was (Re: WI Hams Please read! Date: Mon, 29 Jan 1996 13:25:52 +0000 Organization: 3M - St. Paul, MN 55144-1000 US Lines: 25 Message-ID: <310CCAE0.D0E@mmm.com> References: <4ecli3$elt@hummin.sol.net> <1996Jan27.133555.1413@ke4zv.atl.ga.us> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (WinNT; I) Xref: news.epix.net rec.radio.amateur.antenna:18720 rec.radio.amateur.misc:97435 rec.radio.amateur.policy:32841 Gary Coffman wrote: > > In article <4ecli3$elt@hummin.sol.net> garyk9gs@solaria.sol.net (Gary Schwar tz) writes: > >If you don't live in Wisconsin, please excuse the bandwidth. > > There would be no need to ask our pardon if you'd properly set the > Distribution header line in your message. The reason the Distribution > attribute exists is so that messages of only local interest can be > limited in distribution to only the local area. If you leave it blank, > as I have in this posting, the default distribution is *world*. But there's > no reason to leave it blank if your message is intended for a smaller > audience. > -------SNIP------ > > Sorry to seem to be singling you out for this lecture, but yours > is just the most recent of a number of posts of this nature.-------SNIP----- - I think you missed the mark on this one Gary. While the target audience was t he Ham community of WI, many others are interested in this issue. I presently live i n MN and thus have no vote in WI, but I do own lake properity in WI and plan to put up a tower this year. I might also add that this information is at least worthy of the b andwidth it occupies. One doesn't have to look very far to see the *(&$#%^ postings fr om folks like K1OIK, KF4DDM, that have little good to offer the Ham community. There i s less and less information of worth posted in the USENET Groups and it is becomming wors e on a daily basis. Lets not flame posts that actually offer some information of wor th. Opinions expressed herein are my own and may not represent those of 3M. From lwbyppp@epix.net Tue Jan 30 16:14:39 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Listserv@ucsd (Mailing List Processor) Newsgroups: rec.radio.amateur.antenna Subject: Re: your LISTSERV request "help calculating transmission power" Date: 29 Jan 96 16:24:44 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601291624.IAA10087@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu The mailing list "calculating" could not be found. You may use the INDEX command to get a listing of available mailing lists. From lwbyppp@epix.net Tue Jan 30 16:14:40 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!msunews!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf From: dgf@netcom.com (David Feldman) Subject: dBi of 1/4 wave vertical? Message-ID: Organization: Organization? Me? Date: Mon, 29 Jan 1996 17:19:02 GMT Lines: 4 Sender: dgf@netcom15.netcom.com Pls advise dBi gain (loss...) of your basic 1/4 wave vertical over a groundplane? 73 Dave WB0GAZ dgf@netcom.com From lwbyppp@epix.net Tue Jan 30 16:14:41 1996 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: All spammers please read was (Re: WI Hams Please read! Message-ID: <1996Jan29.184553.14613@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: Date: Mon, 29 Jan 1996 18:45:53 GMT Lines: 53 Xref: news.epix.net rec.radio.amateur.antenna:18727 rec.radio.amateur.misc:97454 rec.radio.amateur.policy:32861 In article Gary Watts writes: >Jim, > >I believe Gary is accessing the news-groups via a ham radio gateway/bbs >Since being able to distro a message to a specific area can be done >in ham packet radio. I also checked with my provider and that is not >a function that can be done with what we have here.. > >I have seen many post from Gary in the past ALL of which was >very informative. I guess that he was having a bad >hair day when he fired up his flame thrower > >Gary.... this is internet not ham packet radio ! No my boy, this is *usenet*, not internet or packet radio. As a fully participating usenet site for many many years, I tell you now that netnews articles have a header, and that header has a Distribution line. If your lame software *hides* that header from you, that's a problem you need to address with your software provider and your site manager. If your lame software hides the header, I'll reproduce the one for this message here in the body text so you can see it. Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur .policy Subject: Re: All spammers please read was (Re: WI Hams Please read! Summary: Expires: References: Sender: Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Followup-To: Distribution: Organization: Destructive Testing Systems Keywords: Now *that's* what a netnews header looks like. Every article generates one. See that line labeled "Distribution:" up there? That's your distribution line. If you leave it blank, the default is "world", but if you put a local or regional code in there, the distribution will be limited to that area. It matters not one whit whether usenet is carried over internet, uucp, packet radio, or two tin cans and a string. The *news* software requires that header, and it's on every message. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Jan 30 16:14:42 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: Rhombics at Low Heights? Date: 29 Jan 1996 19:09:36 GMT Organization: ELNEC/EZNEC Software Lines: 24 Message-ID: <4ej61g$3sr@maureen.teleport.com> References: <4e95tn$ima@chnews.ch.intel.com> NNTP-Posting-Host: ip-pdx06-04.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > Cecil Moore writes: > rkarlqu@scd.hp.com (Richard Karlquist) wrote: > >However, the vertical was 10 to 15 dB. down vs the dipole > >on the 1000 mile paths where I had gotten great reports on the dipole. > Hi Rick, I just picked up a college text on Electromagnetics by Joseph Edmi nister. > Here's a quote: "As the monopole radiates power only in the region above th e > conducting plane, the total radiated power is one-half that of the correspo nding > dipole." Where does the power go? :-) > 73, Cecil, KG7BK, OOTC (not speaking for my employer) Let's ask where the power comes FROM. If we apply the same POWER to the monopole and the dipole, the radiated powers are the same (assuming a lossless situation for both). If we apply the same VOLTAGE to both antennas, the monopole will radiate twice the power as the dipole (because it will have twice the power applied). If we apply the same CURRENT to both antennas, the monopole will radiate half the power as the dipole (because it will have half the power applied). I presume this is the condition assumed in the textbook. If not, we have a question for Dr. Edminister. Roy Lewallen, W7EL From lwbyppp@epix.net Tue Jan 30 16:14:43 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!chnews!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Testing co-axial filter Date: 29 Jan 1996 19:43:23 GMT Organization: Intel Corporation, Chandler, AZ Lines: 13 Distribution: world Message-ID: <4ej80r$tsp@chnews.ch.intel.com> References: <4eh1de$svn@hpcvsnz.cv.hp.com> NNTP-Posting-Host: cmoore.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) tomb@lsid.hp.com (Tom Bruhns) wrote: >the unloaded Q of a resonator made from this line would be about 260. Now >why would I want to use a 16" piece of this line to make a resonator with >that Q, when I could just as well wind a coil half an inch in diameter and >half an inch long and get just as high a Q? Hi Tom, What's your opinion about shorted ladder-line stubs for HF vs say, toroidal inductors? thanks and 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Tue Jan 30 16:14:44 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!miwok!news.wco.com!news From: acopac@hope.netwizards.net Newsgroups: rec.radio.amateur.antenna Subject: Re: Why is man-made RFI vertically polarized? Date: Tue, 30 Jan 1996 01:01:52 GMT Organization: West Coast Online's News Server - Not responsible for content Lines: 7 Message-ID: <4ejqm1$27s@news.wco.com> References: <4e8qfj$ntn@fidoii.cc.lehigh.edu> NNTP-Posting-Host: 206.99.115.44 X-Newsreader: Forte Free Agent 1.0.82 If your talking about things that ride ont he power lines - remember that power lines have ground returns down the poles. Trying to find a source - place an AM radio near the ground wire . The ground is an excellent 40+ ft antenna... The other responses had valid points as well. Good Luck Noland WB6CKT From lwbyppp@epix.net Tue Jan 30 16:14:45 1996 Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!usenet From: billsohl@planet.net (Bill Sohl) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Subject: Re: All spammers please read was (Re: WI Hams Please read! Date: Tue, 30 Jan 1996 01:13:49 GMT Organization: Planet Access Networks - Stanhope, NJ Lines: 71 Message-ID: <4ejrb1$qnu@jupiter.planet.net> References: <4ecli3$elt@hummin.sol.net> <1996Jan27.133555.1413@ke4zv.atl.ga.us> NNTP-Posting-Host: stan21.planet.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.antenna:18726 rec.radio.amateur.misc:97451 rec.radio.amateur.policy:32859 gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >In article <4ecli3$elt@hummin.sol.net> garyk9gs@solaria.sol.net (Gary Schwart z) writes: >>If you don't live in Wisconsin, please excuse the bandwidth. >There would be no need to ask our pardon if you'd properly set the >Distribution header line in your message. The reason the Distribution >attribute exists is so that messages of only local interest can be >limited in distribution to only the local area. If you leave it blank, >as I have in this posting, the default distribution is *world*. But there's >no reason to leave it blank if your message is intended for a smaller >audience. >Each area has its local distribution codes, state codes, regional codes, >country codes, and the default of world. If you don't know the proper >distribution coding to use, ask your sysop. There's no use wasting >the entire world's time with, for example, an announcement of your >local BBS number in Los Angeles when a distribution of LA would limit >it to only those who might care. Same with notices of exam sites for >a locale, IE exam notices for Southern California should have a distribution >attribute of SoCAL. And the same goes for the president of my local club who >recently spammed the world about an event that should have been limited >to an ATL distribution (or at most to a GA distribution). There's no good >reason to spam the net when the tool to prevent that is available to you >in *every message header*. It's just good nettiquette. Actually, many people in any local area might miss postings with limited distributions because their access is via an entity that has a non-local site address. Many examples come to mind such as all those on AOL, Prodigy, Compuserve, etc. There is but one local internet reference for prodigy.com and yet (wherever that may be) prodigy.com serves users throughout the USA (world?). Likewise many other providers, be they actual Internet Providers or perhaps a major corporation (eg. say ibm.com) will be identifiable as a single site location (a single gateway to that domain) yet there may be users anywhere in the world. Not meant as a flame, just a clarification. Additionally, many people travel a great deal and may like to know that a hamfest will be going on when they visit a particular area, so if I were sending a post announcing such an event, I sure wouldn't limit distribution to anything less than USA, for the reasons just stated. Bill Sohl K2UNK >In the proximate case, there was enough of non-local interest in >your post to justify the "world" distribution (or at least a >USA distribution), but because that's true, you needn't beg >forgiveness for using the bandwidth. >Sorry to seem to be singling you out for this lecture, but yours >is just the most recent of a number of posts of this nature. Please >everyone, use the Distribution attribute properly for locale specific >postings. If you don't know how, ask your provider. If he tells you >his system won't permit it, demand he fix his system. Every usenet >message has a Distribution attribute in the header, and every system >has to have a way to set it to some value. >Gary >-- >Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary >Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary >534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us >Lawrenceville, GA 30244 | | Bill Sohl K2UNK ARRL Local Gov't Liason, Mt. Olive Township, NJ From lwbyppp@epix.net Tue Jan 30 16:14:47 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!comp.vuw.ac.nz!usenet From: Richard Hulse Newsgroups: rec.radio.amateur.antenna Subject: CCD antennas..how do I scale them (dowm!) ??? Date: 30 Jan 1996 01:42:22 GMT Organization: Radio New Zealand Lines: 14 Message-ID: <4ejt1u$faj@st-james.comp.vuw.ac.nz> NNTP-Posting-Host: kgill.dialup.netlink.co.nz Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Some years ago an antenna called the CCD (Constant Current Distribution) was presented in, i think, 73 magazine. It utilised sections of wire broken with equal spaced, equal value capacitors and had to be build for a full wave on the lowest frequency of interest. Mine was 80m long! Does anyone know how to scale these antennas to be a more manageable size.? Thanks. Richard Hulse ZL2AJC From lwbyppp@epix.net Tue Jan 30 16:14:48 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!news-adm From: kd4hrt@gate.net (Doug Yarnold) Newsgroups: rec.radio.amateur.antenna Subject: Need HF Vertical Date: Tue, 30 Jan 1996 03:28:50 GMT Organization: CyberGate, Inc. Lines: 4 Message-ID: <4ek269$1e3c@news.gate.net> NNTP-Posting-Host: wpbfl3-14.gate.net X-Newsreader: Forte Free Agent 1.0.82 I'm looking for a good multi-band HF Vertical that I can mount on a Radio Shack push -up pole. Any ideas? Please respond to kd4hrt@gate.net From lwbyppp@epix.net Tue Jan 30 16:14:49 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!news From: adam@libertynet.org (Adam O'Donnell) Newsgroups: rec.radio.amateur.antenna Subject: Re: Best Ant for Packet & Satellite Date: Tue, 30 Jan 1996 03:42:31 GMT Organization: University of Pennsylvania Lines: 14 Message-ID: <4ek3uu$d3g@netnews.upenn.edu> References: <01BAEE3C.0E9E1700@lamar96.mv.com> NNTP-Posting-Host: ts10-61.upenn.edu X-Newsreader: Forte Free Agent 1.0.82 > I do have a Hustler collinear that I bought used a couple of years = >ago & have used on a piece of sheet metal with a mag mount in the attic = >for packet - but is an eggbeater (or something similar) a wiser choice = >to put up on the tower for my intended dual usage? What kind of sats? If you want to try the LEO packet birds, then defintily go with the eggbeather. If you want to do P3 birds, then you are going to have to put up an entire array consisting of two cross polarized antennas, one for 2m and another for 70cm. Oh yeah, don't forget the computer controlled dual axis rotators. Have fun! From lwbyppp@epix.net Tue Jan 30 16:14:50 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!grouper.Exis.Net!usenet From: username@exis.net (Your Real Name) Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk Subject: Re: R7100 Modification Date: 30 Jan 1996 03:58:40 GMT Organization: Exchange Information Systems Networks Lines: 67 Message-ID: <4ek51g$chl@grouper.Exis.Net> References: <4ejqb8$6e5@news.ios.com> NNTP-Posting-Host: 38.exis.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 Xref: news.epix.net uk.radio.amateur:10377 rec.radio.shortwave:69439 rec.radio.amateur.antenna:18730 rec.radio.amateur.equipment:24304 rec.radio.amateur.misc:97458 rec.radio.scanner:44635 alt.radio.scanner:26989 alt.radio.scanner.uk:2057 In article <4ejqb8$6e5@news.ios.com>, . says... > >Ever since ICOM decided to delete the 800 - 900 MHZ coverage from its IC-R710 0 >receiver, >older R7100's demand premium prices on the used market. ICOM insisted that th e >R7100 was >now made in two versions, one for the general public and another (with 800-90 0 >coverage) for >government and law enforcement agencies. The extended coverage version also s ells >for $200-$300 more! Per discussions with ICOM there were very clear that this was >done to comply with >legal requirements that prohibit new scanners from be capable of receiving >cellular telephone >transmissions. My opposition has always been why we should be penalized if we want >to listen to >local law enforcement agencies within the 800 MHz band. Personally, I have no >interest in >listening to cell phones when a receiver as competent as the R7100 opens up a lmost >2 ghz of >spectrum. > >I recently noticed that Grove now offers the R7100 with "restored" coverage s o I >set out to find >out how it was done. Performing the following procedure will allow you to lis ten >to local law >enforcement with the 800-900 mHz portion of the spectrum. Remove the screws t hat >hold the top >cover and disconnect the speaker. Next, remove the two flat head screws that hold >the metal >shield covering the rear of the front panel.. On the rear apron, remove the t wo >screws that hold >the upper chassis to the lower chassis. Finally, remove the antenna cable tha t is >connected to the >circuit board assembly in the rear right corner of the R7100. Referring to th e >owners manual, >CAREFULLY separate the upper half of the receiver, inverting it, setting it b eside >the radio as >illustrated in the owners manual. Be careful not to pull on the cables that >connect the upper >portion to the lower half of the radio. In the front of the owners manual the re is >a small paragraph >that explains the various jumper options for the R7100's CI-V interface optio ns. >It's on this board >that the modification is done. The board is located behind the "M-SET" switch . The >jumpers are >actually circular pads, split vertically. A drop of solder constitutes a jump er - >no solder = no >jumper. > >Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll see a >small ball of >solder. Using solder wick, CAREFULLY remove the solder, exposing the split >circular pad >beneath. The space between the pads is very small so be sure to remove all th e >solder. Reassemble >the radio and you're done! > >Blackshadow > Many thanks my friend who ever you are. I am curious to know who "Grove" i s that you mention. Could you comment on this? I am in the Two-way radio service bu siness and have need of this blocked range of frequencies to monitor for interference . I thought for a while I was going to have to resort to a R9000 which is awfully expensive. Again many thanks. I would like to hear from you here or on my E- Mail chinkle@exis.net From lwbyppp@epix.net Tue Jan 30 16:14:51 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!wb3ffv!ppp48.bcpl.lib.md.us!dbaker From: dbaker@mail.bcpl.lib.md.us (Donald I. Baker) Subject: Re: 82 Repeater in Kansas City Sender: usenet@abs.net Message-ID: Date: Tue, 30 Jan 1996 10:21:39 GMT X-Nntp-Posting-Host: ppp48.bcpl.lib.md.us References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Organization: Reville Engineering Services X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Lines: 47 Xref: news.epix.net rec.radio.amateur.policy:32876 rec.radio.amateur.antenna:18735 rec.radio.amateur.equipment:24320 rec.radio.amateur.homebrew:13023 rec.radio.amateur.digital.misc:13847 In article rob@pe1chl.ampr.org (Rob Janssen) writ es: >From: rob@pe1chl.ampr.org (Rob Janssen) >Subject: Re: 82 Repeater in Kansas City >Date: Tue, 30 Jan 1996 09:24:14 GMT >In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray writ es: >> On the 146.85 repeater here in Central NY we had trouble with one user also . He made it that >>no one would even monitor the reapeater anymore. The club voted to ban him a nd we did. The >>reapeater is a great place to be again. >How do you manage to effectively ban malicious users from a repeater? >Of course this problem is known all over the world, but at least over >here we have not yet found an effective way of stopping them. How do >you do that? >Rob >-- >+------------------------------------+--------------------------------------+ >| Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | >| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | >+------------------------------------+--------------------------------------+ Technical solutions do exist. Using a "TX-ID" board, which uniquely fingerprints each transmitter and a PC one can "slectively" include or preclude individual users. The board was not meant for that purpose, but with just a little Basic of C codes, it workd just fine. It is especially easy if you have a single or limited number of receive site. Good luck and Have fun. Don Donald I. Baker Reville Engineering Services 4619 Schenley Road Baltimore, MD 21210-2525 (410) 467-7163 Custon Harsh Environment Computers and RF Products "Where no PC has gone before..." From lwbyppp@epix.net Tue Jan 30 16:14:53 1996 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: All spammers please read was (Re: WI Hams Please read! Message-ID: <1996Jan30.150921.18430@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ecli3$elt@hummin.sol.net> <1996Jan27.133555.1413@ke4zv.atl.ga.us> <310CCAE0.D0E@mmm.com> Date: Tue, 30 Jan 1996 15:09:21 GMT Lines: 52 Xref: news.epix.net rec.radio.amateur.antenna:18734 rec.radio.amateur.misc:97477 rec.radio.amateur.policy:32875 In article <310CCAE0.D0E@mmm.com> grhosler@mmm.com (Gary Hosler - KN0Z) writes : >Gary Coffman wrote: >> >> In article <4ecli3$elt@hummin.sol.net> garyk9gs@solaria.sol.net (Gary Schwa rtz) writes: >> >If you don't live in Wisconsin, please excuse the bandwidth. >> >> There would be no need to ask our pardon if you'd properly set the >> Distribution header line in your message. The reason the Distribution >> attribute exists is so that messages of only local interest can be >> limited in distribution to only the local area. If you leave it blank, >> as I have in this posting, the default distribution is *world*. But there's >> no reason to leave it blank if your message is intended for a smaller >> audience. >> -------SNIP------ >> >> Sorry to seem to be singling you out for this lecture, but yours >> is just the most recent of a number of posts of this nature.-------SNIP---- -- > >I think you missed the mark on this one Gary. While the target audience was the Ham >community of WI, many others are interested in this issue. I presently live in MN and >thus have no vote in WI, but I do own lake properity in WI and plan to put up a tower >this year. I might also add that this information is at least worthy of the bandwidth >it occupies. One doesn't have to look very far to see the *(&$#%^ postings f rom folks >like K1OIK, KF4DDM, that have little good to offer the Ham community. There is less and >less information of worth posted in the USENET Groups and it is becomming wor se on a >daily basis. Lets not flame posts that actually offer some information of wo rth. >Opinions expressed herein are my own and may not represent those of 3M. If you'd have done a bit less creative snipping and a little more reading, you'd have noted the following in the message you partially quote. [I wrote] >In the proximate case, there was enough of non-local interest in >your post to justify the "world" distribution (or at least a >USA distribution), but because that's true, you needn't beg >forgiveness for using the bandwidth. Now that doesn't look like I'm telling him to restrict distribution on his note now does it? Makes your complaint look a little foolish, doesn't it? (And BTW while I'm in the mood, try to use a linefeed at intervals of less than 80 characters when you post. It'll make the quoted text format *so* much better.) Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Mon Feb 05 21:18:54 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dchamber@mail.orion.ORG (Dennis Chambers) Newsgroups: rec.radio.amateur.antenna Subject: Re: Ham-Ant Digest V96 #29 Date: 25 Jan 96 21:15:47 GMT Organization: ucsd usenet gateway Lines: 22 Message-ID: <199601260015.SAA01499@orions0> Reply-To: dchamber@mail.orion.org (Dennis Chambers) NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Date: Tue, 23 Jan 1996 18:12:52 -0800 From: butler@sonoma.edu (Bob Butler) Subject: Feed Line - Ethernet Coax I think this has been discussed in the past, but does anyone know how well IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line compared to something like RG-8U? Are they fairly comparable as far as signal loss goes in the 2m band? It definitely has to be better the RG-58U I'm using now, which is about 5db loss/100' @ 146mhz. Thanks for any info or comments. I don't see a problem in using it. On every network I have setup the coax inc luded was either RG-58U or RG-8. Infact my 440 antennae is using leftover coax from a job I did. I get a kick out of it because I am the only Ham in my area that I know of using Yellow RG-8! :) 73's ! Dennis Chambers E-mail: dchamber@mail.orion.org Callsign: N0UDZ From lwbyppp@epix.net Mon Feb 05 21:18:55 1996 Path: news.epix.net!uunet!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Feed Line - Ethernet Coax Date: Thu, 25 Jan 96 21:20:59 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 5 Message-ID: References: NNTP-Posting-Host: bos1d.delphi.com X-To: Bob Butler The specs are the same as RG-8F (foam) which is better than RG-8. Unfortunately, it is not UV protected and will fall apart yearly in Arizona. 73, Cecil, KG7BK, OOTC From lwbyppp@epix.net Mon Feb 05 21:18:56 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: mannd@candw.com.ai (Dave Mann) Subject: Re: MFJ SWR Analyzers - Any users? Message-ID: <1197cc$112a1c.14@luzskru.cpcnet.com> Date: Thu, 25 Jan 1996 22:44:13 GMT Reply-To: mannd@candw.com.ai References: <4dbe97$gnt@crusher.ici.net> <4dkpgd$8cc@kodak.rdcs.Kodak.COM> X-Newsreader: Forte Free Agent 1.0.82 Lines: 19 RE: MFJ-259 SWR Analyzer ... Our friend K8MFO brought one with him to VP2E a couple of months ago and is was GREAT! I used it to sort through all kinds of pieces of damaged and undamaged coax, several yagi antennas, 3 verticals, discovered my R7 was mistuned, tested and retuned a 160 meter dipole, and did about 3 or 4 2 meter anteannas. All in about 4 days. This was terrific help to us, after Hurricane LUIS managed to blow everything down and around. If I had the money, you can be SURE I would buy one of the MFJ Analyzers. I had never used one before, and it took me about 10 seconds to figure out how to use it. Also, without reading the instructions, figured out how to test coax with a dummy load at one end, and all kinds of other great stuff. Hats Off to MFJ! best 73's Dave, VP2EHF Dorothea, VP2EE Little Harbour, Anguilla, British West Indies From lwbyppp@epix.net Mon Feb 05 21:18:57 1996 Path: news.epix.net!uunet!in2.uu.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!news.sprintlink.net!hermes.is.co.za!news.pix.za!usenet From: Danie Brynard Newsgroups: rec.radio.amateur.antenna Subject: design for rotary dipole 40m Date: 26 Jan 1996 08:49:32 GMT Organization: PiX - Proxima information X-change Lines: 19 Message-ID: <4ea4is$dj@hawk.pix.za> NNTP-Posting-Host: net-4.pta.pix.za Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I am looking for a practical design for a rotary dipole for 40 and 20m. I would like to build it out of Alu pipe and rotate it on a mast with a HAM 4 rotator, Any ideas, articles on this topic ? 73 danie zs6awk __________________________________ Danie Brynard (ZS6AWK) PO BOX 15133 Centurion 0140 South Africa Email: danie.brynard@pixie.co.za Tel/Fax: 2712-6640330 __________________________________ From lwbyppp@epix.net Mon Feb 05 21:18:57 1996 Path: news.epix.net!news.sprintlink.net!zilker.net!halley!news.mpd.tandem.com!tandem!pacbell.com!ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in1.uu.net!prodigy.com!usenet From: LMBF34A@prodigy.com (Sterling Reed) Newsgroups: rec.radio.amateur.antenna Subject: WIRE TOO CB Date: 26 Jan 1996 23:04:29 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 5 Distribution: world Message-ID: <4ebmlt$2r8q@useneta1.news.prodigy.com> NNTP-Posting-Host: inugap5.news.prodigy.com X-Newsreader: Version 1.2 TO HE PEEEEEE - STERLING REED LMBF34A@prodigy.com From lwbyppp@epix.net Mon Feb 05 21:18:59 1996 Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!delta.misha.net!news.enteract.com!news.inap.net!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!primus.ac.net!news.cais.net!news.structured.net!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.antenna Subject: Re: QRP Tuner Date: 27 Jan 1996 22:34:06 GMT Organization: ELNEC/EZNEC Software Lines: 32 Message-ID: <4ee98u$oqb@maureen.teleport.com> References: <4e79p1$odf@slip.net> NNTP-Posting-Host: ip-pdx02-33.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > Ron Giuntini writes: > Anyone have any suggestions on the best tuner for a 2 watt CW QRP rig? I > am looking for something small, efficient and reasonable in price. I > have looked at the MFJ catalogue but am unable to figure out which is > best for this purpose. I would like to hear from any satisfied users. I > have always been a little bit shy about using a tuner since my thought > was that it would be another power robbing device in the line. Now that > I am going to be using QRP power levels I am concerned about this even > more. Does anyone think using one is a bad idea? Maybe some article in > QST would solve my problem. I could build it if I knew which issue might > have one in it. E mail me at rong@slip.net or reply here. Thanks for > reading this message. You may find, as I have, that the small loss in a good tuner is smaller than the power or efficiency reduction you get feeding your rig to a less than perfectly matched load. Mine also doubles as an output indicator and tells me if the antenna is broken. For many years I've used a variation of a simple highpass T network shown in Solid State Design for the Radio Amateur (Fig. 60, P. 167). It includes a simple bridge for adjustment. I switch in parallel inductors for 20 and 15m. I found the loss to be excessive on 15 until I lowered the Q by increasing the capacitor values by about a factor of two, and lowering the L by the same factor. Now it's a fraction of a dB on 40, 20, and 15. I don't use the 75 pF shunt capacitor shown on the schematic, and I added a 33k resistor from the top of S1 to the bottom of the left side of S1A so the meter will also serve as an output indicator. The whole thing is about the size of a pack of cigarettes (the same size as my original "Optimized" transceiver). 73, Roy Lewallen, W7EL From lwbyppp@epix.net Mon Feb 05 21:19:00 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!in2.uu.net!insync!news.hal-pc.org!usenet From: sid@hal-pc.org Newsgroups: rec.radio.amateur.antenna Subject: Re: CB to Ham Transformation. Date: 27 Jan 1996 22:45:17 GMT Organization: Houston Area League of PC Users Lines: 53 Message-ID: <4ee9tt$7f2@news.hal-pc.org> References: <4e9s0c$lbj@tilde.csc.ti.com> NNTP-Posting-Host: pm1-87.hal-pc.org X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > Joe Fitter BV/N0IAT writes: > > > Anyone out here in Rec.Radio land able to help Alex? How about anyone > in the NYC area? Please email to the below address, not the one in > the top of this message (it was posted elsewhere). Try calling the educational office of the ARRL at 860-594-0301. Tell them you are interested in getting involved in amateur radio. They will be more than happy to give you more information than you knew existed. This will include the phone numbers of some local radio clubs. > Thanks in advance to any elmer who helps. Joe > > ---------------------------------------- > alex948739@aol.com (Alex948739) wrote: > The reason I did not get my licence is because I am only 15. When I have > time to study and learn stuff, I will get a licence. It is a lot easier to get your license now. I was wondering, can > you transform portable CB radio that I have from GE to Ham? How did you > transformed it?Is it a good ham or a bad ham? The simple answer is no. Also, on cb since i live in > NY i hear alot of spanish itallian people speaking in other languages on > most channels and there is alot of profanity. I am wondering is there > anythink like that on HAm? Again, the answer is no. It is against the law and 99.5% of us hams are law a biding. But profanity is the major reason that cb'ers move up to amateur radio. Please send me plans on how to transform. > Thank You I teach amateur radio courses down here in Houston. But if you would contact the ARRL, they would be more than glad to help you get licensed. Call 860-594-0200 or email at . Good luck and 73 +++++++++++++++++++++++++++++++++++++ Sid George, CPA sid@hal-pc.org http://www.hal-pc.org/~sid ------------------------------------- From lwbyppp@epix.net Mon Feb 05 21:19:00 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!uwm.edu!cs.utexas.edu!howland.reston.ans.net!math.ohio-state.edu!usc!newshub.cts.com!usenet From: "Harvey Hiller, KD6QK" Newsgroups: rec.radio.amateur.antenna Subject: Re: design for rotary dipole 40m Date: 28 Jan 1996 06:38:43 GMT Organization: The Fixit-Man Lines: 13 Message-ID: <4ef5lj$ofm@news3.cts.com> References: <4ea4is$dj@hawk.pix.za> NNTP-Posting-Host: kd6qk.cts.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: danie.brynard@pixie.co.za Hi Danie Read your request for info on 40M rotatable dipole. If you received any responses I would like to know if you received anything credible. Please provide any info you can. Thanks in advance. 73 Harv, KD6QK San Diego, CA From lwbyppp@epix.net Mon Feb 05 21:19:01 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!howland.reston.ans.net!math.ohio-state.edu!usc!newshub.cts.com!usenet From: "Harvey Hiller, KD6QK" Newsgroups: rec.radio.amateur.antenna Subject: Re: design for rotary dipole 40m Date: 28 Jan 1996 06:40:41 GMT Organization: The Fixit-Man Lines: 13 Message-ID: <4ef5p9$ofm@news3.cts.com> References: <4ea4is$dj@hawk.pix.za> NNTP-Posting-Host: kd6qk.cts.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: danie.brynard@pixie.co.za Hi Danie Read your request for info on 40M rotatable dipole. If you received any responses I would like to know if you received anything credible. Please provide any info you can. Thanks in advance. 73 Harv, KD6QK San Diego, CA From lwbyppp@epix.net Mon Feb 05 21:19:02 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!math.ohio-state.edu!usc!newshub.cts.com!usenet From: "Harvey Hiller, KD6QK" Newsgroups: rec.radio.amateur.antenna Subject: Re: design for rotary dipole 40m Date: 28 Jan 1996 06:40:42 GMT Organization: The Fixit-Man Lines: 13 Message-ID: <4ef5pa$ot8@news3.cts.com> References: <4ea4is$dj@hawk.pix.za> NNTP-Posting-Host: kd6qk.cts.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: danie.brynard@pixie.co.za Hi Danie Read your request for info on 40M rotatable dipole. If you received any responses I would like to know if you received anything credible. Please provide any info you can. Thanks in advance. 73 Harv, KD6QK San Diego, CA From lwbyppp@epix.net Mon Feb 05 21:19:03 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!news.wco.com!news From: acopac@hope.netwizards.net Newsgroups: rec.radio.amateur.antenna Subject: Re: 72 ohm twin lead ?? Date: Sun, 28 Jan 1996 16:22:05 GMT Organization: West Coast Online's News Server - Not responsible for content Lines: 6 Message-ID: <4eg7rg$2ji@news.wco.com> References: <4due16$h5i@venus.texoma.com> NNTP-Posting-Host: 206.99.115.42 X-Newsreader: Forte Free Agent 1.0.82 Greg is right - the generally accepted value for zipcord is 75 ohms - obviously - its close but may vary from cord to cord...However, I think regular lamp cord is in that range Noland WB6CKT Good luck Greg - cu on the air From lwbyppp@epix.net Mon Feb 05 21:19:04 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk From: "Anthony R. Gold" Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City Date: Sun, 28 Jan 96 17:22:55 GMT Organization: Microvest Limited, London Lines: 19 Message-ID: <822849775snz@microvst.demon.co.uk> References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Reply-To: tgold@microvst.demon.co.uk X-NNTP-Posting-Host: microvst.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: microvst.demon.co.uk Xref: news.epix.net rec.radio.amateur.policy:32944 rec.radio.amateur.antenna:18812 rec.radio.amateur.equipment:24433 rec.radio.amateur.homebrew:13071 rec.radio.amateur.digital.misc:13903 In article <310B8C36.5D9@magnum.wpe.com> caffraye@magnum.wpe.com "Eddie Caffray" writes: > On the 146.85 repeater here in Central NY we had trouble with one user > also. He made it that no one would even monitor the reapeater anymore. The > club voted to ban him and we did. The reapeater is a great place to be > again. That's a weird story. The jerk behaves badly enough to be banned but is obedient enough to obey your request that he voluntarily not transmit on the legally licensed (input) frequency. Were there some strong words of `encouragement' that went with the banning? Regards, -- Tony - G3SKR / AA2PM email: tgold@panix.com tgold@microvst.demon.co.uk packet: g3skr@n0ary.#nocal.ca.usa.na From lwbyppp@epix.net Mon Feb 05 21:19:05 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!li.net!bbruhns From: bbruhns@newshost.li.net (Bob Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Why is man-made RFI vertically polarized? Date: 28 Jan 1996 18:43:25 GMT Organization: LI Net (Long Island Network) Lines: 19 Message-ID: <4egg4d$4sl@linet02.li.net> NNTP-Posting-Host: linet04.li.net X-Newsreader: TIN [version 1.2 PL2] Of course, it depends on what you mean by RFI, etc, etc, etc. What is meant here is unintentional RF crud from electric motors, furnace arc-starters, computers, etc. This sort of RFI starts out pretty much randomly polarized, heading out in all directions. It's really too weak to propagate very far, so only the local ground wave is usually of any importance. Now, the groundwave propagates along the moderately conductive surface of the earth, and this has the effect of attenuating the horizontally polarized component of the signal much faster than the vertical component, because the reflection from the earth's surface is 180 degrees out of phase with the direct signal for horizontally polarized groundwave and it quickly gets cancelled out. However, this reflection is in-phase for vertically polarized groundwave, so it propagates relatively happily. The result is that the RFI you get from neighborhood gadgets is mostly vertically polarized. Bob Bruhns, WA3WDR, bbruhns@li.net From lwbyppp@epix.net Mon Feb 05 21:19:06 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.jersey.net!news.win.bright.net!brutus.bright.net!chi-news.cic.net!newsfeed.internetmci.com!news.flinet.com!usenet From: hrsil@flinet.com (KE4WBW) Newsgroups: rec.radio.amateur.antenna Subject: Loops!!!! Date: 28 Jan 1996 23:20:51 GMT Organization: Florida Internet Lines: 10 Message-ID: <4eh0ck$pnk@news.flinet.com> NNTP-Posting-Host: wpb22.flinet.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Have just installed my Horiz. Loop and am extremely inpressed with its performance. However: I fed it with 50ohm coax and am running it without a tuner. Some people have said that it is best fed with 75ohm coax. Does any one have info. on this? or maybe the radiation resistance so I might be able to construct a balun? -- Henry Silvia hrsil@flinet.com {KE4WBW} WPB. FLA From lwbyppp@epix.net Mon Feb 05 21:19:07 1996 Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!nntp-trd.UNINETT.no!nac.no!ifi.uio.no!news.sics.se!eua.ericsson.se!news.algonet.se!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!comp.vuw.ac.nz!usenet From: Richard Hulse Newsgroups: rec.radio.amateur.antenna Subject: (no subject) Date: 29 Jan 1996 00:00:09 GMT Organization: Netlink Lines: 19 Message-ID: <4eh2m9$p7n@st-james.comp.vuw.ac.nz> NNTP-Posting-Host: kgill.dialup.netlink.co.nz Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Some years ago an antenna called the CCD (Constant Current Distribution) was presented in, i think, 73 magazine. It utilised sections of wire broken with equal spaced, equal value capacitors and had to be build for a full wave on the lowest frequency of interest. Mine was 80m long! I've mislaid the original article in a house shift so two questions.. 1. Where were the original articles published (so I can get new copies)? and 2. Does anyone know how to scale these antenna to be a more manageable size.? Thanks. Richard Hulse ZL2AJC From lwbyppp@epix.net Mon Feb 05 21:19:08 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!uchinews!uwvax!tricia!news.atw.fullfeed.com!dennis From: bigd@mail.atw.fullfeed.com (Dennis Nuetzel) Newsgroups: rec.radio.amateur.antenna Subject: Re: Looking for info on legal cases involving commercial antenna-tower construction Date: Mon, 29 Jan 96 04:18:17 GMT Organization: FullFeed Communications, Appleton, WI, USA, Sol-3 Lines: 31 Message-ID: <4ehhr3$9p@ray.atw.fullfeed.com> References: <4dk20l$e0a@news.milwaukee.tec.wi.us> <4dq9b5$qja@ray.atw.fullfeed.com> <4e9oij$83i@odo.PEAK.ORG> <4ebu1f$aj1@safety.ics.uci.edu> NNTP-Posting-Host: dennis.atw.fullfeed.com X-Newsreader: News Xpress Version 1.0 Beta #4 In article <4ebu1f$aj1@safety.ics.uci.edu>, turner@safety.ics.uci.edu (Clark Savage Turner) wrote: >>Nope. The FCC has ruled that local government must make "reasonable >>allowances" for antennas. The ruling dealt with Amateur Radio Stations, >>if I remember correctly. However, they did not say that local agencies >>had no say - not the "reasonable". Basically, it means that antennas >>cannot be prohibited by local governments - but they can still limit >>the size of the antennas and towers. Thank you Bill. I was not aware of this ruling. A couple of years ago I was involved in an incedent where a Green Bay, WI alderman was trying to get rid of a person in the neighborhood who was a ham. One of the things cited was the antenna on the roof, and the "Jolly Roger" (skull & croosbones) flag that was attached. The flag was sort of a semi-humorous, semi-serious type of defiance measure by the ham, since the ham was doing nothing illegal. The problem stemmed from the fact that the alderman didn't like the ham, and wanted the ham out of his neighborhood, and the only thing he could use to cause trouble was the antenna. The ham is a friend of mine, so I contacted the F.C.C., when the alderman tried to cause a stink, and the City Attorney claimed that it was local jurisdiction. A F.C.C. lawyer sent me a pack with the court case Carino v. Deerfield, New York. Again, thanks for the heads-up. Dennis From lwbyppp@epix.net Mon Feb 05 21:19:09 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!news1.isp.net!news.isp.net!news.14.227!not-for-mail From: mikeka@online-la.com (Mike Kapitan) Newsgroups: rec.radio.amateur.antenna Subject: Re: Gap Antennas Date: Mon, 29 Jan 1996 13:32:13 -0800 Lines: 8 Message-ID: <4eje9p$lki@14.227> References: <4dfj24$7rm@ixnews2.ix.netcom.com> <4eiae6$2fj0@info4.rus.uni-stuttgart.de> NNTP-Posting-Host: 206.29.14.227 NNTP-NEWS-ADMIN: newsadmin@14.227 X-Newsreader: Value-Added NewsWatcher 2.0d31h+ Have a Gap Eagle and am extrememly disappointed .... good SWR on all bands but EXTREMELY inefficient and generally a poor performer ... wouldn't buy another one. Aside from its' poor electrical performance, physically it's not well constructed either. Hope this helps, Mike KM6WB From lwbyppp@epix.net Mon Feb 05 21:19:10 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!uunet!in2.uu.net!news.new-york.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!news.uh.edu!news.sfasu.edu!titan.sfasu.edu!z_stuadr From: z_stuadr@titan.sfasu.edu Subject: Help findind part 95 Message-ID: <1996Jan29.155749@titan.sfasu.edu> Date: 29 Jan 96 15:57:49 CST Organization: Stephen F. Austin State University Lines: 36 Path: titan.sfasu.edu!z_stuadr From: z_stuadr@titan.sfasu.edu Newsgroups: rec.radio.info Subject: Part 95, please help locate Message-ID: <1996Jan29.155524@titan.sfasu.edu> Date: 29 Jan 96 15:55:24 CST Organization: Stephen F. Austin State University Lines: 27 Path: titan.sfasu.edu!z_stuadr From: z_stuadr@titan.sfasu.edu Newsgroups: rec.radio.cb Subject: Request for part 95 Message-ID: <1996Jan29.141710@titan.sfasu.edu> Date: 29 Jan 96 14:17:10 CST Organization: Stephen F. Austin State University Lines: 18 Greetings to all I would appreciate it if any body could point me to a web site that contains the following: Title 47 chapter 1 subchapter D part 95. The above is the Code of Federal Regulations relating to general moblie radios . It also contains the rules for CB radios. I have searchd serval web sites including Cornell Law School's website. I would like to download part 95 of the regulations in its entireity. A footnote to this request. It sure is easy to find part 97 which is the rule s for amatuer radios. Their must be a lot of ham operators on the internet. Please help if you can. Thanks in advance. David Stua Stephen F. Austin University Nacogdoches, Texas CB handler is "Dogstar" From lwbyppp@epix.net Mon Feb 05 21:19:11 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!uunet!in2.uu.net!news.new-york.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!news.uh.edu!news.sfasu.edu!titan.sfasu.edu!z_stuadr From: z_stuadr@titan.sfasu.edu Subject: Re: Help findind part 95 Message-ID: <1996Jan29.160417@titan.sfasu.edu> Date: 29 Jan 96 16:04:17 CST References: <1996Jan29.155749@titan.sfasu.edu> Organization: Stephen F. Austin State University Lines: 41 In article <1996Jan29.155749@titan.sfasu.edu>, z_stuadr@titan.sfasu.edu writes : > Path: titan.sfasu.edu!z_stuadr > From: z_stuadr@titan.sfasu.edu > Newsgroups: rec.radio.info > Subject: Part 95, please help locate > Message-ID: <1996Jan29.155524@titan.sfasu.edu> > Date: 29 Jan 96 15:55:24 CST > Organization: Stephen F. Austin State University > Lines: 27 > > Path: titan.sfasu.edu!z_stuadr > From: z_stuadr@titan.sfasu.edu > Newsgroups: rec.radio.cb > Subject: Request for part 95 > Message-ID: <1996Jan29.141710@titan.sfasu.edu> > Date: 29 Jan 96 14:17:10 CST > Organization: Stephen F. Austin State University > Lines: 18 > > Greetings to all > > I would appreciate it if any body could point me to a web site that contains > the following: Title 47 chapter 1 subchapter D part 95. > The above is the Code of Federal Regulations relating to general moblie radi os. > It also contains the rules for CB radios. I have searchd serval web sites > including Cornell Law School's website. I would like to download part 95 of > the regulations in its entireity. > > A footnote to this request. It sure is easy to find part 97 which is the ru les > for amatuer radios. Their must be a lot of ham operators on the internet. > > Please help if you can. Thanks in advance. > > David Stua > Stephen F. Austin University > Nacogdoches, Texas > CB handler is "Dogstar" > From lwbyppp@epix.net Mon Feb 05 21:19:12 1996 Path: news.epix.net!uunet!in1.uu.net!news.spss.com!uchinews!news.luc.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: davidc@lamar96.mv.COM (David, Michaela & Benjamin) Newsgroups: rec.radio.amateur.antenna Subject: Best Ant for Packet & Satellite Date: 29 Jan 96 16:22:16 GMT Organization: ucsd usenet gateway Lines: 19 Message-ID: <01BAEE3C.0E9E1700@lamar96.mv.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I am in a low spot (200 feet above sea level) & have a 90 foot tower = plus mast to get me to 300. I am surrounded within 20 miles by hills = between 300 and 450 feet high. I'd like to put an antenna at the top of the mast that will serve = well for general 2 meter packet and satellite work. Recommendations? I do have an 11 element 2 meter Cushcraft up that is vertically = polarized at the moment, but it is a pain to keep swinging it when not = really necessary but for its inherent directionality. I do have a Hustler collinear that I bought used a couple of years = ago & have used on a piece of sheet metal with a mag mount in the attic = for packet - but is an eggbeater (or something similar) a wiser choice = to put up on the tower for my intended dual usage? All suggestions are very much appreciated. 73, David AA1FA From lwbyppp@epix.net Mon Feb 05 21:19:13 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!castle.nando.net!news From: geo@nando.net (George McCrary) Newsgroups: rec.radio.amateur.antenna Subject: Re: Ground Radials...? Date: Mon, 29 Jan 1996 17:41:49 GMT Organization: News & Observer Public Access Lines: 16 Message-ID: <4ej0tn$bko@castle.nando.net> References: NNTP-Posting-Host: grail517.nando.net X-Newsreader: Forte Agent .99a.107 1. Buy the ARRL Antenna book. 2. Read it. 3. Ignore 50% of what anybody tells you, and doubt the other 50%. There is no use in putting more than one non-resonant radial in the same place. If the radials are resonant they need to be at least six feet in the air. Buy or borrow the book. 73 DE KQ4QM (George) From lwbyppp@epix.net Mon Feb 05 21:19:14 1996 Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!frankensun.altair.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs From: rs@ham.island.net (Robert Smits) Newsgroups: rec.radio.amateur.antenna Subject: Re: (no subject) Message-ID: <012996183404Rnf0.79b6@ham.island.net> Date: Mon, 29 Jan 1996 18:34:00 PST References: <4eh2m9$p7n@st-james.comp.vuw.ac.nz> Reply-To: rs@ham.island.net Distribution: world Organization: The Curmudgeon's Cottage X-Newsreader: Rnf 0.79b6 Lines: 38 Richard Hulse writes: >Some years ago an antenna called the CCD (Constant Current Distribution) >was presented in, i think, 73 magazine. It utilised sections of wire >broken with equal spaced, equal value capacitors and had to be build for >a full wave on the lowest frequency of interest. Mine was 80m long! > >I've mislaid the original article in a house shift so two questions.. > >1. Where were the original articles published (so I can get new copies)? > The following articles are about the CCD: H.A. Mills and G Brizendine, "Antenna Design: Something New!", 73, October 1978, pp 282-289 D. Atkins, "The High Performance, Capacitively Loaded Dipole", Ham Radio, May 1984, pp 33-35 The material is also revisited in the ARRL Antenna Compendium, Volume 2, which includes a Basic program to calculate CCD Dipoles, and the ARRL Antenna Comendium, Volume 3 has an article analyzing its performance. >and > >2. Does anyone know how to scale these antenna to be a more manageable >size.? The program askes for what frequency you'd like to make the antenna. I don't know how well it scales from personal experience, though. Bob, VE7HS -- rs@ham.island.net The undisputed fame enjoyed by Shakespeare as a writer..... is like every other lie, a great evil. Tolstoy From lwbyppp@epix.net Mon Feb 05 21:19:15 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs From: rs@ham.island.net (Robert Smits) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.po Subject: Re: All spammers please read was (Re: WI Hams Please read! Message-ID: <012996184456Rnf0.79b6@ham.island.net> Date: Mon, 29 Jan 1996 18:44:00 PST References: Reply-To: rs@ham.island.net Distribution: world Organization: The Curmudgeon's Cottage X-Newsreader: Rnf 0.79b6 Lines: 33 Xref: news.epix.net rec.radio.amateur.antenna:18886 rec.radio.amateur.misc:97717 Gary Watts writes: > >Jim, > >I believe Gary is accessing the news-groups via a ham radio gateway/bbs >Since being able to distro a message to a specific area can be done >in ham packet radio. I also checked with my provider and that is not >a function that can be done with what we have here.. Being able to set distribution is possible with virtually all properly functioning usenet newsreaders. If your provider doesn't know how (as opposed to can't be bothered to lead you through it) he shouldn't be imitating a service provider. >>I have seen many post from Gary in the past ALL of which was >very informative. I guess that he was having a bad >hair day when he fired up his flame thrower > >Gary.... this is internet not ham packet radio ! GC seems to realize that just fine, although you don't. Any properly configured newsreader ought to allow you to set the distribution header. It's not the reader's fault if the service provider hasn't set it up that way, of course, but the reader should nag his provider to do so. Using the distribution header properly is a GOOD way to reduce unnecessary costs to the overall network. -- rs@ham.island.net Man is the only animal that blushes. Or needs to. Mark Twain From lwbyppp@epix.net Mon Feb 05 21:19:16 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!news1.sunbelt.net!ags-r1-p2.groupz.net!flanders From: flanders@znet.GroupZ.net (Jerry Flanders) Newsgroups: rec.radio.amateur.antenna Subject: ANTENNA MODELING SOFTWARE FOR WINDOWS Date: Mon, 29 Jan 1996 20:15:44 Eastern Organization: SunBelt.Net INTERNET Access Lines: 16 Message-ID: NNTP-Posting-Host: ags-r1-p2.groupz.net X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] There is a neat "try-before-buy" package of antenna modeling software for windows available at http://www.funet.fi/pub/ham/antenna/NEC/ the file is NEC-WIN.ZIP It is about 1.3 megs, so it takes awhile to download. I just got it recently, and have only started evaluating it. If someone else has already looked it over, I would appreciate hearing from you. I had been looking for a way to visualize the output of the generic mininec3. At first glance, this package looks like a lot more than I was hoping for. Jerry Flanders W4UKU South Carolina flanders@groupz.net From lwbyppp@epix.net Mon Feb 05 21:19:18 1996 Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet From: "Dana H. Myers" Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Subject: Re: All spammers please read was (Re: WI Hams Please read! Date: 29 Jan 1996 20:42:13 GMT Organization: Sunsoft, Los Angeles Lines: 59 Message-ID: <4ejbf5$abn@abyss.West.Sun.COM> References: <1996Jan29.184553.14613@ke4zv.atl.ga.us> NNTP-Posting-Host: vr1000p.west.sun.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (X11; I; SunOS 5.5 i86pc) X-URL: news:1996Jan29.184553.14613@ke4zv.atl.ga.us Xref: news.epix.net rec.radio.amateur.antenna:18774 rec.radio.amateur.misc:97552 rec.radio.amateur.policy:32916 gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >In article Gary Watts writes: >>Jim, >> >>I believe Gary is accessing the news-groups via a ham radio gateway/bbs >>Since being able to distro a message to a specific area can be done >>in ham packet radio. I also checked with my provider and that is not >>a function that can be done with what we have here.. >> >>I have seen many post from Gary in the past ALL of which was >>very informative. I guess that he was having a bad >>hair day when he fired up his flame thrower >> >>Gary.... this is internet not ham packet radio ! > >No my boy, this is *usenet*, not internet or packet radio. >As a fully participating usenet site for many many years, >I tell you now that netnews articles have a header, and >that header has a Distribution line. If your lame software >*hides* that header from you, that's a problem you need >to address with your software provider and your site manager. > >If your lame software hides the header, I'll reproduce the one for >this message here in the body text so you can see it. > >Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateu r.policy >Subject: Re: All spammers please read was (Re: WI Hams Please read! >Summary: >Expires: >References: >Sender: >Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) >Followup-To: >Distribution: >Organization: Destructive Testing Systems >Keywords: > > >Now *that's* what a netnews header looks like. Every article >generates one. See that line labeled "Distribution:" up there? >That's your distribution line. If you leave it blank, the default >is "world", but if you put a local or regional code in there, >the distribution will be limited to that area. > >It matters not one whit whether usenet is carried over internet, >uucp, packet radio, or two tin cans and a string. The *news* >software requires that header, and it's on every message. ..unless, of course, you're forwarding Usenet via Morse code.... ;-) -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Mon Feb 05 21:19:19 1996 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!jlowman From: jlowman@netcom.com (Jim Lowman) Subject: Re: All spammers please read was (Re: WI Hams Please read! Message-ID: Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Organization: NETCOM On-line Communication Services (408 261-4700 guest) X-Newsreader: TIN [version 1.2 PL1] References: <1996Jan29.184553.14613@ke4zv.atl.ga.us> Date: Mon, 29 Jan 1996 21:22:30 GMT Lines: 45 Sender: jlowman@netcom6.netcom.com Xref: news.epix.net rec.radio.amateur.antenna:18861 rec.radio.amateur.misc:97665 rec.radio.amateur.policy:32971 Gary Coffman (gary@ke4zv.atl.ga.us) wrote: : No my boy, this is *usenet*, not internet or packet radio. : As a fully participating usenet site for many many years, : I tell you now that netnews articles have a header, and : that header has a Distribution line. If your lame software : *hides* that header from you, that's a problem you need : to address with your software provider and your site manager. : If your lame software hides the header, I'll reproduce the one for : this message here in the body text so you can see it. [example header snipped] : Now *that's* what a netnews header looks like. Every article : generates one. See that line labeled "Distribution:" up there? : That's your distribution line. If you leave it blank, the default : is "world", but if you put a local or regional code in there, : the distribution will be limited to that area. : It matters not one whit whether usenet is carried over internet, : uucp, packet radio, or two tin cans and a string. The *news* : software requires that header, and it's on every message. Quite correct, Gary. However, while the distribution line is evident when I use the tin newsreader on my shell account with Netcom, I do not recall seeing one on my other Internet account, where I use the Netscape 2.0 beta for reading netnews. It must be there, though. I can see where it might be easily overlooked, and where newcomers to usenet might not be aware of its presence. A question, though. I can limit distribution to CA, but is it even possible to limit distribution to WI? Not sure if individual states will work, other than CA. The original example shows a case in which distribution to a limited area is a good idea. But then, it seems to me that most posts to the ham newsgroups are rarely regional in nature. That is the reason that I hate to see posts where the originator requests an e-mail reply. In many cases, others can also benefit from seeing the answer posted "out in the open." Just my 2 cents worth, 73 de Jim - KF6CR San Bernardino, CA From lwbyppp@epix.net Mon Feb 05 21:19:21 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: ritter@privatei.COM (Stu Ritter) Newsgroups: rec.radio.amateur.antenna Subject: Sommer XP beams Date: 29 Jan 96 21:32:48 GMT Organization: ucsd usenet gateway Lines: 24 Message-ID: <199601292132.OAA05011@mantis.privatei.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I recently installed a Sommer XP-406 antenna. It has been in use for two months and included a go at the ARRL RTTY Roundup. This is the very short boom (2.4 meters) antenna. I find good front to side ratio but near no front to back. It is almost like a vertical with gain in two directions. I am planning to extend the boom to the next size of 4.4 meters. I would not recommend this antenna unless you absolutely cannot use anything larger. My last antenna was a Telex TH-7. I have used the XP-506 while on a visit to Germany at a friends station in April of 1990. Running 100 Watts from a TS-940 the signal reports from the states on 15-17 and 20 meters were higher than I expected from a 15 foot boom antenna. Granted the solar index at the time was quite favorable, the signal reports were much more than expected. The SWR on the 406 has been exactly as spec'd by the manufacturer and the 40 meter dipole came down to 1.3:1 with the antenna mounted at 65 feet. The materials are first rate and the construction is robust to say the least. The construction instructions are understandable, but not equal to the manual from Hy-Gain on the TH-7. There are enough construction drawings to fascilitate rather painless assembly. Signal reports on the 406 have been as expected from such a small boomed antenna. Stu N0LEF From lwbyppp@epix.net Mon Feb 05 21:19:22 1996 Path: news.epix.net!uunet!in2.uu.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!kaiwan.kaiwan.com!not-for-mail From: alf@kaiwan.com (Alfred Lee) Newsgroups: rec.radio.amateur.antenna Subject: Re: Testing co-axial filter Date: 29 Jan 1996 22:06:39 -0800 Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338) Lines: 39 Sender: alf@kaiwan009.kaiwan.com Message-ID: References: <4eh1de$svn@hpcvsnz.cv.hp.com> NNTP-Posting-Host: kaiwan009.kaiwan.com In article <4eh1de$svn@hpcvsnz.cv.hp.com>, tomb@lsid.hp.com (Tom Bruhns) wrote : > > I'd like to offer a slightly different viewpoint. I have network analyzers > available, and yes, they are certainly nice to measure what you have put [stuff deleted] > OK, so let's take a quick peek at using transmission lines for filtering... > Consider a line like foam-RG-8 type with a velocity factor of .8 and > an attenuation of 2dB/100 feet. At 2 meters, if I did my math right, > the unloaded Q of a resonator made from this line would be about 260. Now > why would I want to use a 16" piece of this line to make a resonator with > that Q, when I could just as well wind a coil half an inch in diameter and > half an inch long and get just as high a Q? Or, by making a helical > resonator in a short piece of 1" copper pipe, I can end up with an unloaded > Q of about 500, and get half the loss as if I used the transmission line. > And if I want bandwidths on the order of 1.5MHz at 150MHz, I'll need loaded > Q's of 100 for the simplest filters and quite a bit higher for higher order > filters. So the very first step in a _design_ tells me that coaxial cable > is probably NOT the way to implement the resonators I'll need. > > > -- > Cheers, > Tom > tomb@lsid.hp.com These are really interesting material. Where can I find more about this topic? Is ARRL Handbook a good source? 73, p.s. Looks like my server did not get all newgroup traffic cause this is the only article I have seen in this thread. Did I missed the one on how to make a million buck? --- Alfred Lee alf@kaiwan.co m KE6KGV 'The answer is (e^iă + 1) ? "No" : "Yes"' From lwbyppp@epix.net Mon Feb 05 21:19:23 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.antenna Subject: Re: Testing co-axial filter Date: 29 Jan 1996 22:16:37 GMT Organization: Hewlett Packard Corvallis Site Lines: 46 Distribution: world Message-ID: <4ejh05$b52@hpcvsnz.cv.hp.com> References: <4ej80r$tsp@chnews.ch.intel.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Cecil Moore (cmoore@sedona.intel.com) wrote: : Hi Tom, What's your opinion about shorted ladder-line stubs for HF vs say, : toroidal inductors? Well, certainly there's a space issue. If ladder line fits your mechanical requirements, then, if you want to consider it as a resonator, you can easily figure the unloaded Q if you know the loss, say L in dB/100 feet, and the velocity factor, v.f. Then Qu = 2.77 * f / (v.f. * L) where Qu is the unloaded resonator Q, for a resonator n quarterwaves long, where n is a small integer f is the frequency in MHz v.f. is velocity factor of line L is loss in dB/100 ft. If, for example, you have a line with 0.1dB/100 ft loss at 14MHz and a velocity factor of .95 and you're going to operate it at 14Mhz, then the unloaded Q of a quarter wave stub should be around 400. That's comparable, at least with what you could do with a toroidal inductor. Another example: 3-1/8" line at 146MHz should have about .13dB/100ft loss, and that will yield an unloaded Q of around 3000. That's why duplexer cavities tend to be about that size: it really is a decent Q, as opposed to the example I gave in my earlier post. If you are asking about using a stub that's not a quarter wave, to get some arbitrary impedance, that's a slightly different question than what the base post was looking for. Haven't gone through the math, but I'd suspect that typical lines will give you inductive reactances with Q's pretty close to the resonant unloaded Q. Also: be careful about stubs coupling to your antenna, if you are using them close by. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Mon Feb 05 21:19:24 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.eecs.umich.edu!news.eecs.umich.edu!majewski From: majewski@spsd630a.erim.org (Ron Majewski) Newsgroups: rec.radio.amateur.antenna Subject: Tower Selection Advice Sought Date: 29 Jan 1996 23:12:35 GMT Organization: Environmental Research Institute of Michigan, Ann Arbor, Michigan Lines: 28 Distribution: world Message-ID: NNTP-Posting-Host: spsd630a.erim.org Hello- A friend of mine is thinking about putting up a new tower and is looking for advice/information about tower options. His desire-ments are: 60-80ft height self-supporting to avoid guy wires tilt-over or telescoping for easy installation/service 20 sqft wind load capacity Is such a combination possible to achieve? Please share your thoughts and experiences with him. Please Email to me and I will forward things to him. Thanks and 73, Ron (wb8ruq). majewski@erim.org -- Ron Majewski (majewski@erim.org) The Environmental Research Institute of Michigan From lwbyppp@epix.net Mon Feb 05 21:19:25 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!netaxs.com!mhv.net!usenet From: Pete Dziomba Newsgroups: rec.radio.amateur.antenna Subject: Larson 2M/70Cm "open Coil" whip dimensions... Date: 30 Jan 1996 00:21:40 GMT Organization: MHVNet, the Mid Hudson Valley's Internet connection Lines: 9 Message-ID: <4ejoak$m5q@over.mhv.net> NNTP-Posting-Host: ulster-port26.mhv.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Can anyone tell me the actual dimensions of the Larson dual band? This is the new "Open coil", usally black, style. I smoked something in the one I had, the old "Plastic incased" style... It works fine on VHF but stinks on UHF... I replaced the ant., but just wanted to make a replacment whip for Temp. setups since just the center coil is bad... I need to know the Distance from the bottom of the whip to the Coil, # of turns of the coil, Length of the coil, I.D. of the coil, and length above the coil... Thanks for any info... 73 Pete n2mci@mhv.net From lwbyppp@epix.net Mon Feb 05 21:19:26 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.ifu.net!ifu From: n2tnn@ifu.net (Dean) Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Date: 30 Jan 1996 00:22:34 GMT Organization: ifu.net Lines: 16 Message-ID: <4ejocb$lgp@news.ifu.net> References: <4efig2$h3c@newsbf02.news.aol.com> NNTP-Posting-Host: ip62.ifu.net X-Newsreader: News Xpress Version 1.0 Beta #4 In article <4efig2$h3c@newsbf02.news.aol.com>, rsmall01@aol.com (RSmall01) wrote: >Any comments on the GAP Titan DX Vertical would be very much appreciated! > >73 >Dick N1WJP >EMail RSmall01@aol.com Dick, It works for me. 73, Dean N2TNN From lwbyppp@epix.net Mon Feb 05 21:19:27 1996 Path: news.epix.net!uunet!in1.uu.net!news.ios.com!usenet From: . (Blackshadow) Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk Subject: R7100 Modification Date: 30 Jan 1996 00:56:08 GMT Organization: IBF Lines: 57 Message-ID: <4ejqb8$6e5@news.ios.com> NNTP-Posting-Host: 205.147.154.70 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net uk.radio.amateur:10540 rec.radio.shortwave:69636 rec.radio.amateur.antenna:18869 rec.radio.amateur.equipment:24526 rec.radio.amateur.misc:97689 rec.radio.scanner:44955 alt.radio.scanner:27174 alt.radio.scanner.uk:2086 Ever since ICOM decided to delete the 800 - 900 MHZ coverage from its IC-R7100 receiver, older R7100's demand premium prices on the used market. ICOM insisted that the R7100 was now made in two versions, one for the general public and another (with 800-900 coverage) for government and law enforcement agencies. The extended coverage version also se lls for $200-$300 more! Per discussions with ICOM there were very clear that this was done to comply with legal requirements that prohibit new scanners from be capable of receiving cellular telephone transmissions. My opposition has always been why we should be penalized if we want to listen to local law enforcement agencies within the 800 MHz band. Personally, I have no interest in listening to cell phones when a receiver as competent as the R7100 opens up al most 2 ghz of spectrum. I recently noticed that Grove now offers the R7100 with "restored" coverage so I set out to find out how it was done. Performing the following procedure will allow you to list en to local law enforcement with the 800-900 mHz portion of the spectrum. Remove the screws th at hold the top cover and disconnect the speaker. Next, remove the two flat head screws that h old the metal shield covering the rear of the front panel.. On the rear apron, remove the tw o screws that hold the upper chassis to the lower chassis. Finally, remove the antenna cable that is connected to the circuit board assembly in the rear right corner of the R7100. Referring to the owners manual, CAREFULLY separate the upper half of the receiver, inverting it, setting it be side the radio as illustrated in the owners manual. Be careful not to pull on the cables that connect the upper portion to the lower half of the radio. In the front of the owners manual ther e is a small paragraph that explains the various jumper options for the R7100's CI-V interface option s. It's on this board that the modification is done. The board is located behind the "M-SET" switch. The jumpers are actually circular pads, split vertically. A drop of solder constitutes a jumpe r - no solder = no jumper. Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll see a small ball of solder. Using solder wick, CAREFULLY remove the solder, exposing the split circular pad beneath. The space between the pads is very small so be sure to remove all the solder. Reassemble the radio and you're done! Blackshadow From lwbyppp@epix.net Mon Feb 05 21:19:28 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.qnet.com!news.widomaker.com!uunet!in1.uu.net!everest.iserv.net!usenet From: Jim Keesler Newsgroups: rec.radio.amateur.antenna Subject: Re: Ground Radials...? Date: 30 Jan 1996 01:28:11 GMT Organization: WWMT TV Lines: 26 Message-ID: <4ejs7b$bp@everest.iserv.net> References: NNTP-Posting-Host: dialup250.iserv.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Hi Tom--de K8EXF. Some ground radial thoughts: 1. You can avoid digging by just laying the wires on the surface while the grass (weeds?) is/are dead--then when spring arrives, the wires are covered by the new growth! Works fine as long as there isn't much traffic while they're exposed. If necessary, use some hair 'bobby pins" or some plastic clips to hold the wires to the surface. 2. As far as RF is concerned, you are simulating a conductive surface, and the more conductors the better--up to a point. AM broadcasters figure 120 radials is good, but hams have good luck with 16 or 32. As you add wires, you need to double the previous number to get a significant result. Plan on at least 1/4 wavelength for the lowest band desired. 3. In the real world, just lay out what fits--if you want to include 160 meters, try to run each radial to the edge of your 150 X 150 area. 4. Ground rods at the ends don't make much difference for RF since the RF can only penetrate a few inches of soil. However for lightning protection grounding, bury a few heavy copper wires (bare) and put ground rods on their ends. (For RF, the radials can be insulated--you get a big capacitance to "ground". Good luck and 73! From lwbyppp@epix.net Mon Feb 05 21:19:29 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!netaxs.com!news2.cais.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!istar.net!news1.toronto.fonorola.net!news1.toronto.istar.net!news.toronto.istar.net!delaney.tap.net!news2.toronto.istar.net!server1.oxford.net!usenet From: gcollins@Oxford.net (Gordon Collins) Newsgroups: rec.radio.amateur.antenna Subject: Interference with lamps Date: Tue, 30 Jan 1996 04:30:34 GMT Organization: North Norwich Telephone Lines: 9 Message-ID: <4ek79r$a3t@server1.oxford.net> NNTP-Posting-Host: burgessville-119.oxford.net X-Newsreader: Forte Free Agent 1.0.82 We have a lamp on the second floor of our home. It is one ofthose lights wich is operated by touching it. (trilight). Whenever I tune up my rig in the basement the lamp starts to turn on and proceed through all three cycles. It is very annoying. My antenna is a centrefed dipole cut for 40M. It is strung between two treest at approximately the same hight asthe second floor but about twenty feet away. Does anyone have any ideas on how to correct this problem? From lwbyppp@epix.net Mon Feb 05 21:19:30 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.onramp.net!news.mind.net!chi-news.cic.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.new-york.net!news.columbia.edu!watsun.cc.columbia.edu!jbaltz From: jbaltz@watsun.cc.columbia.edu (Jerry B Altzman) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy Subject: Re: All spammers please read was (Re: WI Hams Please read! Date: 30 Jan 1996 04:39:09 GMT Organization: double ionizers association Lines: 19 Message-ID: <4ek7dd$pln@apakabar.cc.columbia.edu> References: <1996Jan29.184553.14613@ke4zv.atl.ga.us> NNTP-Posting-Host: watsun.cc.columbia.edu Xref: news.epix.net rec.radio.amateur.antenna:18760 rec.radio.amateur.misc:97527 rec.radio.amateur.policy:32901 In article <1996Jan29.184553.14613@ke4zv.atl.ga.us>, Gary Coffman wrote: >Now *that's* what a netnews header looks like. Every article >generates one. See that line labeled "Distribution:" up there? >That's your distribution line. If you leave it blank, the default >is "world", but if you put a local or regional code in there, >the distribution will be limited to that area. You hope. That is, if one of your upstream or downstream sites isn't dain bramaged to the point of ignoring Distribution: lines. (Many were. I can't remember how many postings we'd get to an old, internal-to-Columbia newgroup cu.bboard from Colorado University with Distribution: set to denver or co or something else.) >Gary //jbaltz jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz From lwbyppp@epix.net Mon Feb 05 21:19:31 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!primus.ac.net!news.hsonline.net!eddie.cioe.com!cioeserv.cioe.com!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Listserv@ucsd (Mailing List Processor) Newsgroups: rec.radio.amateur.antenna Subject: Re: your LISTSERV request "help calculating transmission power" Date: 30 Jan 96 06:12:11 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601300612.WAA10855@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu The mailing list "calculating" could not be found. You may use the INDEX command to get a listing of available mailing lists. From lwbyppp@epix.net Mon Feb 05 21:19:32 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Listserv@ucsd (Mailing List Processor) Newsgroups: rec.radio.amateur.antenna Subject: Re: your LISTSERV request "help findind part 95 (2 msgs)" Date: 30 Jan 96 06:12:15 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601300612.WAA10869@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu The mailing list "findind" could not be found. You may use the INDEX command to get a listing of available mailing lists. From lwbyppp@epix.net Mon Feb 05 21:19:33 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: 82 Repeater in Kansas City Reply-To: pe1chl@wab-tis.rabobank.nl Organization: PE1CHL Message-ID: References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Date: Tue, 30 Jan 1996 09:24:14 GMT Lines: 17 Xref: news.epix.net rec.radio.amateur.policy:33008 rec.radio.amateur.antenna:18907 rec.radio.amateur.equipment:24595 rec.radio.amateur.homebrew:13149 rec.radio.amateur.digital.misc:13973 In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray write s: > On the 146.85 repeater here in Central NY we had trouble with one user also. He made it that >no one would even monitor the reapeater anymore. The club voted to ban him an d we did. The >reapeater is a great place to be again. How do you manage to effectively ban malicious users from a repeater? Of course this problem is known all over the world, but at least over here we have not yet found an effective way of stopping them. How do you do that? Rob -- +------------------------------------+--------------------------------------+ | Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | +------------------------------------+--------------------------------------+ From lwbyppp@epix.net Mon Feb 05 21:19:34 1996 Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail From: sparkfel@primenet.com (Mark Fellhauer) Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City/Repeater Use Date: 30 Jan 1996 09:26:00 -0700 Organization: Primenet Services for the Internet Lines: 43 Sender: root@primenet.com Message-ID: <4elgqo$q73@nnrp1.news.primenet.com> References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> X-Posted-By: ip200.phx.primenet.com X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.policy:32923 rec.radio.amateur.antenna:18785 rec.radio.amateur.equipment:24394 rec.radio.amateur.homebrew:13052 rec.radio.amateur.digital.misc:13884 rob@pe1chl.ampr.org (Rob Janssen) wrote: >In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray writ es: >> On the 146.85 repeater here in Central NY we had trouble with one user also . He made it that >>no one would even monitor the reapeater anymore. The club voted to ban him a nd we did. The >>reapeater is a great place to be again. >How do you manage to effectively ban malicious users from a repeater? >Of course this problem is known all over the world, but at least over >here we have not yet found an effective way of stopping them. How do >you do that? Go to the Arizona Repeater Association's Home Page to see how this is done. It involves actively pursuing people who engage in such activity. The ARA, as a matter of routine, has an interference committee dedicated to tracking these people down. Despite reports to the contrary, the FCC does frown on this activity, and will enforce sanctions. Just ask the people here in Phoenix about that. An NAL, Notice of Apparant Liability, carries a stiff monetary fine, about $20,000 (US) worth and forfeiture of ALL broadcasting equipment and license(s). It has been reported to me, by Dan Ford, Commander of the SHERRIF'S Ham Radio Posse, that they also plan to actively engage in pursuing people misusing radio gear in Maricopa County. I strongly suggest that if you plan on jamming a repeater in Central Arizona, plan on getting caught. Unfortunately, the ARA has had, for the 3rd time its existence, had to remove a member, by board action, for misconduct involving repeaters. This "gentleman" is also facing stiff legal sanctions from the FCC. In 1995, the 3 biggest abusers of ARA repeaters WERE caught, and several others have been identified. 73, Mark Fellhauer KC7BXS From lwbyppp@epix.net Mon Feb 05 21:19:36 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!nntp.coast.net!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.antenna Subject: Re: Yagi design and tuning ?'s Date: 30 Jan 1996 10:09:01 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 42 Message-ID: <4ekqnt$2qno@info4.rus.uni-stuttgart.de> References: <4ehe6i$25f2@news.doit.wisc.edu> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de > I just built a Yagi using the design software packaged with the >latest antenna handbook. Question is this: I design it for a center >frequency of 146 but when I tune it I get a perfect match at 144 MHz. >I built a T-match with a 4:1 coaxial balun. (6-ele). There are two possible reasons: 1) The software is not accurate (It happens!), May be someone has compared with NEC-2 based programs? 2) You did not adhere to some dimensions, like boom and element diameter, method of element mounting. In any case shortening the driven element will not help, even if you get a reasonable match, the gain and pattern will be nowhere near what it is supposed to be, in other words your antenna performes like a much smaller one which has been properly designed. One criterium for a proper antenna simmulation is, that when you design the feed point impedance to be 50 Ohms it comes out 50 Ohms without further adjustments. 73, Moritz DL5UH I started >shortening the driven element but the perfect match seemed to >still occur around 144. Before I shorten the DE more, what is the >correlation between the surrounding element lengths as far as >tuning freq. is concerned? Should I just keep shortening the DE >and a assume the design software is correct for the other element >lengths or will shortening the DE not produce the desired effect. >Do I need to shorten all the elements to produce a good match at a >slightly higher frequency? (Non-conducting boom, 3/8" dia alum. ele) > >Welcome any hints and insights, > >Thanks alot, John Lumkes AA9QP lumkes@cae.wisc.edu > From lwbyppp@epix.net Mon Feb 05 21:19:36 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!uunet!in2.uu.net!EU.net!sun4nl!baan.nl!jmaas From: jmaas@baan.nl (Johan Maas) Subject: Strange Dipole Sender: news@baan.nl Message-ID: Date: Tue, 30 Jan 1996 13:41:57 GMT X-Nntp-Posting-Host: daly.baan.nl Organization: Baan International b.v. Keywords: Dipole Lines: 27 Hello Antenna people, I have made a short dipole. I made on the end of each leg a "coil" like: -------- feedpoint ---------------- ------- ------- ------- this describes only one end. The wire is winded on a pvc tube! this is done in the length direction of the tube; so the forward and backward wire are in the opposite di rection. This means that iam actual not making a coil. The length of the tube is 20cm! It was surprising me that i saw that the dipole not wordked on the frequencie i had planned the dipole but on the double frequencie. So i did some tests and the dipole had a total length of one wave. The impedan ce was guite good the swr was good. I work for the first time on 15m ! The total length of the dipole is 4 meter. It works great. I hope to see some nice answers, how this antenna works and how the radiate di agram look like? 73 from PA3GSB the Johan. From lwbyppp@epix.net Mon Feb 05 21:19:37 1996 Path: news.epix.net!news.sprintlink.net!castle.nando.net!imci4!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!news.ptd.net!news From: georgef@postoffice.ptd.net (George) Newsgroups: rec.radio.amateur.antenna Subject: HELP-Interference Date: 30 Jan 1996 14:22:15 GMT Organization: ProLog - PenTeleData, Inc. Lines: 12 Message-ID: <4el9in$h@ns2.ptd.net> NNTP-Posting-Host: cs1-04.eph.ptd.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 I'm trying to use my AEAfax to receive FAX/RTTY. But My computer generates too much interfercne. I know its not the monitor,mouse,keyboard,&modem. I've removed all and powered up CPU and still get noise. I've taken CPU to another room (on another electrical circuit) and still get a +20dB noise level from CPU. Now I'm on the second story of a townhouse and my radios are only grounded to the electrical system ground. I'm thinking of running a ground wire from second floor window and driving a rod in the ground. Will this help? I know nothing about grounding. Tnx George From lwbyppp@epix.net Mon Feb 05 21:19:38 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!cyberspace.com!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.av.qnet.com!ibbs!js From: js@ibbs.av.org (Jeff Stillinger) Subject: Re: ~~~? What is the best coax cable for CB's?~~~~ X-Newsreader: TIN [version 1.2 PL2] Organization: Coffee Radio Difference Committee Message-ID: References: <4dpris$qhs@hgea01.hgea.org> <4dr03e$n1l@newsbf02.news.aol.com> <4ebt3g$fkn@news.mcn.net> Date: Tue, 30 Jan 1996 14:30:49 GMT Lines: 15 Vince Fiscus, KB7ADL (vfiscus@mcn.net) wrote: : Best Coax for CB is one that ends in a dummy load. It is VERY important that when using CB radio to mount your coax in a strait line, placing a nail though the coax every 3 feet. Roofing nails work best. This will keep the cable from flopping about in the wind. -- ----------------------------------------------------------------------------- Jeff Stillinger - KB6IBB js@ibbs.av.org PSC Box 3429 js@red-eft.la.ca.us Edwards AFB, CA 93524 +1 805 258 7303 8N1 ----------------------------------------------------------------------------- From lwbyppp@epix.net Mon Feb 05 21:19:40 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 30 Jan 1996 14:39:30 GMT Organization: Continental Cablevision Lines: 33 Message-ID: <4elaj2$j89@usenet.continental.com> References: <4ecj8s$6ug@newsbf02.news.aol.com> <4edc05$b1f@newsbf02.news.aol.com> NNTP-Posting-Host: 169.152.167.70 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) >I've had that problem on both 160 and 80 also. 1/2 wl verticals stink. Tom: I would think that a 1/2 al vertical would be tough to beat for the really long-haul DX on 160. I had always envisioned my dream antenna for 160 as a 190-degree Pi-Rod tower, guyed with Phillystran, and mounted on a three-foot concrete base pier with a Blaw-Knox glass base insulator. Of course, the foundation for the 190 degree radiator found its beginnings with Ballantine's 5/8 wl radiator in 1923, but I believe it was Brown, Lewis, et. al., who then optimzed the length to 190 degrees in an effort to maximize ground-wave radiation (through the ubiquitous multi-wire ground system) and minimize skywave radiation with the 190 degree radiator. The problem as I see it, we as amateurs rarely have a need to maximize ground wave radiation. A byproduct of this however, is that an extremely low launch angle can be taken advantage of for the mega-long DX. Back to reality: There was an interesting article in the August, 1994 issue of QST, entitled "The 160-Meter Sloper System at K3LR" -pp. 36-38. This antenna system takes on the characteristics of a 1/2 wl radiator, but has several advantages. First, the antenna is arranged as a perpendicular inverted "V" against a tall tower; 190 feet in this case. Multiple Vees are then arranged against the tower to provide for a limited amount of directivity. Secondly, the lower portion of the Vee can be moved away from the tower (perhaps on a pulley system) in order to vary the launch angle of the antenna. My dream antenna may now be leaning in this direction, but I still need that blasted 200 foot tower! -Paul, N9AZ From lwbyppp@epix.net Mon Feb 05 21:19:41 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!lll-winken.llnl.gov!enews.sgi.com!decwrl!pa.dec.com!nntpd.lkg.dec.com!zk3.dec.com!coolidge From: coolidge@zk3.dec.com (Bayard Coolidge USG ZKO3-3/S20) Newsgroups: rec.radio.amateur.antenna Subject: Re: Feed Line - Ethernet Coax Date: 30 Jan 1996 16:07:20 GMT Organization: Digital Equipment Corporation Lines: 35 Distribution: world Message-ID: <4elfno$uo2@nntpd.lkg.dec.com> References: Reply-To: coolidge@zk3.dec.com (Bayard Coolidge USG ZKO3-3/S20) NNTP-Posting-Host: pele.zk3.dec.com X-Newsreader: mxrn 6.18-32 -- I have the specs for Ethernet coax at home (in hard copy), and I'll try to remember to bring them in tomorrow and re-post them. Although I was on the original design team, I don't have our measurements, but someone else's. In talking to some local hams here with backgrounds similar to mine in networking (i.e., they too have a bunch of Ethernet coax in the basement :-), it seems that it "falls apart" at UHF. That is, the spec sheet I have implies as Cecil, KB7BK, states that the losses are about the same as foamed RG-8/U type (or about the same as RG14A or RG217) on paper, but the numbers about 200 MHz or so may have to be taken with a grain of salt. I haven't tried it myself as yet, as I don't have the proper measurement equipment needed to do the job. An earlier post mumbled about it being poorly shielded. I find that extremely hard to believe given that the shield is foil-braid-foil-braid (inside -> outside), making it on a par with CATV hardline. For those not familiar with it, the center conductor is about 11.5 AWG solid wire. And yes, it was designed by a ham (not me), so the overall size and construction was somewhat deliberately made to imitate "RG8/U". And yes, it should be left indoors or in a pipe, and not buried or left exposed to the weather. Oh, by the way, the yellow PVC variety is essentially the same thing, as is the bluish-purple DEC CI cable (but with TNC's). ------------------------------------------------------------------------------ Bayard R. Coolidge N1HO DISCLAIMER: The opinions expressed are Digital Equipment Corp. solely those of the author, and not Nashua, New Hampshire, USA those of Digital Equipment Corporation coolidge@zk3.dec.com nor any other entity. "Brake for Moose - It can save your life" - N.H. Fish & Game Dept. ------------------------------------------------------------------------------ From lwbyppp@epix.net Mon Feb 05 21:19:43 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!rclnews.eng.ohio-state.edu!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.starlink.com!usenet From: Bill Funk Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk Subject: Re: R7100 Modification Date: 30 Jan 1996 19:11:30 GMT Organization: Star Link Internet Services Lines: 29 Message-ID: <4elqh2$p71@pegasus.starlink.com> References: <4ejqb8$6e5@news.ios.com> <4ek51g$chl@grouper.Exis.Net> NNTP-Posting-Host: pm1-14.starlink.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) Xref: news.epix.net uk.radio.amateur:10553 rec.radio.shortwave:69651 rec.radio.amateur.antenna:18879 rec.radio.amateur.equipment:24540 rec.radio.amateur.misc:97702 rec.radio.scanner:44980 alt.radio.scanner:27187 alt.radio.scanner.uk:2089 >> >>Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll se e a >>small ball of >>solder. Using solder wick, CAREFULLY remove the solder, exposing the split >>circular pad >>beneath. The space between the pads is very small so be sure to remove all t he >>solder. Reassemble >>the radio and you're done! >> >>Blackshadow >> > > Many thanks my friend who ever you are. I am curious to know who "Grove" is that >you mention. Could you comment on this? I am in the Two-way radio service b usiness >and have need of this blocked range of frequencies to monitor for interferenc e . I >thought for a while I was going to have to resort to a R9000 which is awfully >expensive. Again many thanks. I would like to hear from you here or on my E -Mail >chinkle@exis.net=> ===================================================================== Hmmm... If you can buy a new R9000 (since you are in a business that will allow you to do so), then you can get an un-restricted R-7100. Me, I'm lucky. I have an older R-7100, full coverage! (No, it's *not* for sale!!) :-) Bill Funk From lwbyppp@epix.net Mon Feb 05 21:19:44 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!wa2ise From: wa2ise@netcom.com (Robert Casey) Subject: Re: Interference with lamps Message-ID: Organization: Netcom Online Communications Services (408-241-9760 login: guest) References: <4ek79r$a3t@server1.oxford.net> Date: Tue, 30 Jan 1996 22:47:10 GMT Lines: 21 Sender: wa2ise@netcom17.netcom.com In article kell@mpac.jsc.nasa.gov (T ed Kell) writes: > >Take a sledgehammer to the lamp. :) > >72 Usually these touch lamps generate gobs of RFI interference, so getting rid of it would be a sensible thing to do. > >In article <4ek79r$a3t@server1.oxford.net>, gcollins@Oxford.net (Gordon >Collins) wrote: > >> We have a lamp on the second floor of our home. It is one ofthose >> lights wich is operated by touching it. (trilight). Whenever I tune up >> my rig in the basement the lamp starts to turn on and proceed through >> all three cycles. It is very annoying. >> My antenna is a centrefed dipole cut for 40M. It is strung >> between two treest at approximately the same hight asthe second floor >> but about twenty feet away. >> Does anyone have any ideas on how to correct this problem? From lwbyppp@epix.net Mon Feb 05 21:19:45 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!newserve!ub!news.localnet.com!usenet From: fstengel Newsgroups: rec.radio.amateur.antenna Subject: Re: VHF/UHF disguise antenna for Mobile use Date: 31 Jan 1996 01:42:27 GMT Organization: LocalNet Corporation Lines: 11 Message-ID: <4emhe3$rgu@prometheus.localnet.com> References: <4e85ua$1jv@ornews.intel.com> NNTP-Posting-Host: ppp104.localnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: Collier_Chun@ccm.hf.intel.com Good evening I read with intrest your questions about DISGUISED ANTENNAS. If you would like to discuss this topic call me between 8:00 and 5:00, Monday thru Friday. Just ask to speak with Fran. To wet your intrest note my address. 73 BCNU Fran Stengel Jr.K2GUG Sti-Co Ind. Inc. 11 Cobham Dr. Orchard Park N.Y. 14127 716 662 2680 From lwbyppp@epix.net Mon Feb 05 21:19:46 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!gatech!swrinde!sgigate.sgi.com!sdd.hp.com!col.hp.com!news.cis.okstate.edu!ki5zw!n5xcr!news From: Paul Reedy Subject: Re: Transformer for Screwdriver type antenna Sender: news@n5xcr.ampr.org (news) Organization: n5xcr.ampr.org Message-ID: X-Nntp-Posting-Host: 192.168.18.12 Date: Wed, 31 Jan 1996 01:51:16 GMT Lines: 21 Hank Blackstock writes: > gmfoster@cpcnet.com (Garry Foster) wrote: > >I hear that Don Johnson and others are now recomending a matchinng > >transformer at the base of this antenna instead of the matching > >capicators. > > I can't imagine what the advantage would be. capacitors, are > cheap, simple and effective. I have used them for years on my > screwdriver antenna. (my own design with 3.5 inch coil). > someone please enlighten me as to the advantage. > > 73 Hank > > Apparantly, with the transformer, you don't need the relays to switch in and out, reducing complexity, However I don't know how effective this really is. I would like to have the information on this transformer, as a friend of mine tried making a screwdriver ant. and went back to his Hustler after not being able to get his SWR down. Please let me know where I can get the specs on this transformer design, so I can forward it to him. From lwbyppp@epix.net Mon Feb 05 21:19:47 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!kaiwan.kaiwan.com!news.uoregon.edu!newsfeed.internetmci.com!howland.reston.ans.net!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!atkes From: atkes@imap1.asu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: Solid dielectric coax Date: 31 Jan 1996 04:14:56 GMT Organization: Arizona State University Lines: 19 Message-ID: <4emqc0$t7s@news.asu.edu> References: <4ebjb8$m76@chnews.ch.intel.com> <4elo8i$fok@maureen.teleport.com> NNTP-Posting-Host: general4.asu.edu X-Newsreader: TIN [version 1.2 PL2] Roy Lewallen (w7el@teleport.com) wrote: : To get the same specs as 9913 but with solid dielectric insulation, : you need either larger diameter cable or very creative specsmanship. Hopeful ly : the coax manuafacturers won't discover what the antenna manufacturers have : about how to sell goods to amateurs. Actually, I suspect they already have discovered this since I have seen various Belden clones with "less loss than Belden" of one or two tenths dB per 100 feet. I asked here last spring if anyone knew what the tolerances are for the loss figures that coax manufacturers give. I speculated that since they are quoted to a tenth of a dB per 100 feet that that is the sort of tolerance expected. Nobody who knew answered. A couple of measurements of mine on clone brand coaxes give loss values that are well outside and above (0.5 to 1 dB) the values given in the specifications. It could be that my measurements are in error. I hope so. At least accurate coax loss measurements are a lot easier than accurate antenna gain measurements. Kevin w9cf@ptolemy.la.asu.edu From lwbyppp@epix.net Mon Feb 05 21:19:48 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!cygnus.com!cambridge-news.cygnus.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: kb9vu@aol.com (KB9VU) Newsgroups: rec.radio.amateur.antenna Subject: Re: GAP Titan DX Date: 31 Jan 1996 07:06:59 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 23 Sender: root@newsbf02.news.aol.com Message-ID: <4enm13$jia@newsbf02.news.aol.com> References: <4ejocb$lgp@news.ifu.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Dick, It works for me also. I've checked mine against a dipole at 35' and a longwire (160' X 30' up at is's highest point) and there are both plus and minus differences. NONE of them shows the GAP worse by more than 1 S unit. 75 meter performance is 1 to 2 S units better than the dipole! 40 meter performance is equal to or better than the dipole and slightly worse than the longwire depending on wether working phone or CW. The GAP is better in the Phone end. 20 meters is slightly worse than both the other antennas with the dipole working the best. 15 meters is better than the long wire and equal to the dipole. 10 meters is worse than both the dipole and the longwire (less than 1 S unit though). On 17 meters, both the dipole and the long wire are better. On 12 meters, the long wire is better, the GAP and dipole are equal. From my observations and those of others in the area, folks either like them or they don't. There is a mind set in the Ham community that ALL verticals are really tall dummy loads. I have not found that to be the case. Mine works fine in my installation which is a compromise due to space and zoning restrictions. My antenna is ground mounted with the 40 meter counterpoise only 10 to 12" off the grass. Mike, KB9VU From lwbyppp@epix.net Mon Feb 05 21:19:49 1996 Path: news.epix.net!news.sprintlink.net!news.ais.net!vixen.cso.uiuc.edu!usenet From: "C. J. Hawley" Newsgroups: rec.radio.amateur.antenna Subject: Re: Transformer for Screwdriver type antenna Date: Wed, 31 Jan 1996 10:05:55 -0600 Organization: University of Illinois at Urbana Lines: 71 Message-ID: <310F9363.16DD@aries.scs.uiuc.edu> References: NNTP-Posting-Host: antwerp-7.slip.uiuc.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) Paul Reedy wrote: > > Hank Blackstock writes: > > gmfoster@cpcnet.com (Garry Foster) wrote: > > >I hear that Don Johnson and others are now recomending a matchinng > > >transformer at the base of this antenna instead of the matching > > >capicators. > > > > I can't imagine what the advantage would be. capacitors, are > > cheap, simple and effective. I have used them for years on my > > screwdriver antenna. (my own design with 3.5 inch coil). > > someone please enlighten me as to the advantage. > > > > 73 Hank > > > > > Apparantly, with the transformer, you don't need the relays to switch > in and out, reducing complexity, However I don't know how effective > this really is. I would like to have the information on this transformer, > as a friend of mine tried making a screwdriver ant. and went back to > his Hustler after not being able to get his SWR down. Please let me know > where I can get the specs on this transformer design, so I can forward it > to him. The Sierra screwdriver antenna uses a small (I think ferrite) toroid with about 28 turns on it (wound around twice...that is 14 turns to go around and then another 14 to go around again). They feed the antenna at the center tap of the toroid winding (at the point between the two 14 turn windings). This point is at the 12.5 ohm impedance. I use a T225A-2 toroid wound this same way for the match adjust on my bugcatcher style mobile antenna. I have about 10 taps on mine from a couple up from the center tap and the rest down. I select the taps with relays but probably could maybe pick one tap as a compromise for several bands. I have a motor driven cap in series with the antenna from the tap to adjust to resonance. I find that multiple taps are necessary when the efficiency of the antenna is improved on the low bands. As the losses are eliminated, then the impedance of the short antenna say on 160M begins to get down to a few ohms (if you're lucky). The antenna rad resistance of the short antenna on 160M is well below an ohm, the rest of the ohms being due to losses. This should give you a clue as to the efficiency of the commercial screwdriver antenna on the low bands if only one tap is necessary for a match. Some of my friends have gone to the parallel cap for the match in an attempt to improve the efficiency of the method of the match adjust over the tapped toroid, but I haven't found my tproid to be too much of a detriment. I don't place the highest in the mobil shootouts (and don't care), but one setup that does also uses the toroid. My tuner setup is in the trunk with a very short wire to the antenna. It's important to keep this lead short with minimum capacity to ground (no coax here). Also, note that the voltage can get high here on the lowest band if the antenna is far from resonance and the series cap adjusted to a low capacitance value. It's best to keep the antenna close to resonance and the series capacity near the maximum value (mine is a 1000 pf vacuum var.). Of course with the screwdriver this point is meaningless since the antenna is adjusted to resonance by changing the value of the center loading coil and there is no series capacitor. I don't mean to confuse you here by switching back and forth between the screwdriver antenna and the bugcatcher but the laws of physics are the same for both and understanding one style well implies understanding both well. With the screwdriver, resonance is adjusted by the center loading coil. With the bugcatcher, one way resonance is adjusted is by using a center loading coil that gives resonance just down the band from where you want to be and using a series cap to bring the resonance up to where you want it. The match method can be the same for both. -- Charles Jack Hawley Jr. Amateur Radio KE9UW (A.K.A. 'Chuck' in Ham Radio) BMW K100RS, BMWMOA #224 (A.K.A. 'Jack' in Motorcycles) hawley@aries.scs.uiuc.edu Sr. Research Engineer Emeritus Univ of Ill, Urbana-Champaign From lwbyppp@epix.net Mon Feb 05 21:19:51 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: EWE Antenna Date: 31 Jan 1996 10:32:54 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 29 Sender: root@newsbf02.news.aol.com Message-ID: <4eo236$p21@newsbf02.news.aol.com> References: <4elpgt$r59@news01.aud.alcatel.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4elpgt$r59@news01.aud.alcatel.com>, sander@aud.alcatel.com (dick sander) writes: > >Has anyone built and tested the EWE 160m receiving >antenna described in an article by WA2WVL in Feb '95 QST? > >How well does it work? > >Are there any sources for the 3:1 transformer (kits) >and any suggestions on a preamp? > >73, Dick - K5QY Hi Dick, I did a survey on Topband net with users. Responses 11. Good or OK 4, poor or no good 7. Most comments indicate the EWE was better than a tx antenna, unless the tx antenna was directional or in a rural location. Even short Beverages always seemed to beat the EWE. F/B results ranged from poor to good, but there was no way to tell the reason for this from the responses. I suspect proximity to other antennas, soil conditions, or failure to de-couple the feedline from the antenna was the cause. 73 Tom From lwbyppp@epix.net Mon Feb 05 21:19:51 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!swidir.switch.ch!epflnews!dinews.epfl.ch!usenet From: Jean-Yves Perrier Newsgroups: rec.radio.amateur.antenna Subject: Patch antenna Date: 31 Jan 1996 11:04:11 +0100 Organization: Ecole Polytechnique Federale de Lausanne Lines: 14 Sender: perrier@didec16.epfl.ch Message-ID: NNTP-Posting-Host: didec16.epfl.ch Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: September Gnus v0.26/Emacs 19.29 Hello, I've heard about a "patch antenna". I don't know what it look like, neither where it is used (!). Does somebody know something about it, or can point some references to me ? Thanx in advance. -- Jean-Yves Perrier From lwbyppp@epix.net Mon Feb 05 21:19:52 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: wa8msf@aol.com (WA8MSF) Newsgroups: rec.radio.amateur.antenna Subject: Re: Solid dielectric coax Date: 31 Jan 1996 11:42:23 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 4 Sender: root@newsbf02.news.aol.com Message-ID: <4eo65f$r0i@newsbf02.news.aol.com> References: <4elo8i$fok@maureen.teleport.com> Reply-To: wa8msf@aol.com (WA8MSF) NNTP-Posting-Host: newsbf02.mail.aol.com I think you might be interested in Belden 9914 or Times LMR-400 Mike WA8MSF@aol.com From lwbyppp@epix.net Mon Feb 05 21:19:53 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!cencore!forrest.gehrke From: forrest.gehrke@cencore.com (FORREST GEHRKE) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 M˙˙˙˙˙ Message-ID: <8B9E2C8.02CF000697.uuout@cencore.com> Date: Wed, 31 Jan 96 11:52:00 -0300 Distribution: world Organization: Central Core BBS, 201-575-8991 Reply-To: forrest.gehrke@cencore.com (FORREST GEHRKE) References: <4eh0ck$pnk@news.flinet.com> X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 16 WW> Mike, there are two stations here on the east coast that may be able WW> offer you some help. Bruce, K01F, has a 4square on 80 meters with WW> halfwave elements. At least he started with half waved, however, af WW> while he concluded that his elevation level was (would you believe) WW> low. I don't think he is using the array on 160, but I'm sure he ha WW> some playing around with it. I have been told that Bruce has changed his 4Square to 3/8 wavelength height. I don't know how he is driving this array. Since the elements are longer than 1/4 w.l. measuring mutual impedance requires sectioning as open circuiting them at their base does not take them out of action. Perhaps they might be detuned sufficiently to make mutual measurements. Maybe Tom W8JI can answer that question. I'm doubtful about detuning them. * RM 1.3 02583 * 90% of PC problems are between the keyboard & the chair. From lwbyppp@epix.net Mon Feb 05 21:19:54 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!io.org!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!cencore!forrest.gehrke From: forrest.gehrke@cencore.com (FORREST GEHRKE) Newsgroups: rec.radio.amateur.antenna Subject: WANTED : GREAT 80 M˙˙˙˙˙ Message-ID: <8B9E2CB.02CF000696.uuout@cencore.com> Date: Wed, 31 Jan 96 11:55:00 -0300 Distribution: world Organization: Central Core BBS, 201-575-8991 Reply-To: forrest.gehrke@cencore.com (FORREST GEHRKE) X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 12 MM> Whole array is fed with DX Engineering phase box a-la Collins style. MM> Tune each tower to exactly the same format with an MFJ combo SWR MM> and impedance bridge. They all are perfect matches size wise tower MM> tower. Hook up the phase delay lines, hook up the line to the shac This array requires equal current to each element. If you measured it, I'd be very interested in what you see for range of current at each element as you switch the array thru its four directions. * RM 1.3 02583 * I'm having a deja vu experience, just like last time From lwbyppp@epix.net Mon Feb 05 21:19:55 1996 Path: news.epix.net!news.sprintlink.net!cyberspace.com!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: Transformer for Screwdriver type antenna Date: 31 Jan 1996 12:25:45 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 26 Sender: root@newsbf02.news.aol.com Message-ID: <4eo8mp$s1u@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader >Apparantly, with the transformer, you don't need the relays to switch >in and out, reducing complexity, However I don't know how effective >this really is. I would like to have the information on this transformer, >as a friend of mine tried making a screwdriver ant. and went back to >his Hustler after not being able to get his SWR down. Please let me know >where I can get the specs on this transformer design, so I can forward it >to him. > Why not use a shunt inductor at the bottom? At least it "moves" in the correct direction automatically as frequency is increased. Since the base impedance rises as frequency is increased, and inductive reatance also increases, it tends to track. I use the same coil on 160 through 40! A shunt capacitor moves the wrong way. As the base impedance rises with frequency, the capacitive reactance decreases....exactly the opposite of what we want! A transformer stays fixed as frequency changes, and needs moved to other taps as the band changes. Transformers also generally have more loss than a simple lumped shunt component. Where is the advantage? It costs more and is more complex, and still requires adjustment with low loss antennas. 73 Tom From lwbyppp@epix.net Mon Feb 05 21:19:56 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in2.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news From: Tom Skelton Subject: Re: Interference with lamps Message-ID: Sender: news@ncrcae.ColumbiaSC.ATTGIS.COM (news) Reply-To: Tom.Skelton@ColumbiaSC.ATTGIS.COM (skeltt) Organization: NCR X-Newsreader: DiscussIT 2.5.1.3 for MS Windows [AT&T Software Products Division] References: Date: Wed, 31 Jan 1996 14:06:58 GMT Lines: 46 >==========Robert Casey, 1/30/96========== > >In article >kell@mpac.jsc.nasa.gov (Ted Kell) writes: >> >>Take a sledgehammer to the lamp. :) >> >>72 >Usually these touch lamps generate gobs of RFI interference, so getting >rid of it would be a sensible thing to do. >> >>In article <4ek79r$a3t@server1.oxford.net>, gcollins@Oxford.net (Gordon >>Collins) wrote: >> >>> We have a lamp on the second floor of our home. It is one ofthose >>> lights wich is operated by touching it. (trilight). Whenever I tune up >>> my rig in the basement the lamp starts to turn on and proceed through >>> all three cycles. It is very annoying. >>> My antenna is a centrefed dipole cut for 40M. It is strung >>> between two treest at approximately the same hight asthe second floor >>> but about twenty feet away. >>> Does anyone have any ideas on how to correct this problem? > > As W4MPY also noted in the Carolina DX Association's "Pileup" member newsletter (there, got that shameless plug in... ;-) ) they really are terribly susceptible to RFI. In Wayne's case, his 40 meter transmissions were causing 2 of the lamps in his bedroom to cycle through the low-med-bright levels while his wife was sleeping. She came running into the radio room, and once he got her to calm down she indicated it looked like a SWAT team was outside! IMHO, touch-activated lamps and amateur radio are mutually exclusive. 73, tom WB4iUX WB4iUX@AOL.COM 31 days and still missing Calvin & Hobbs..... From lwbyppp@epix.net Mon Feb 05 21:19:58 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!in-news.erinet.com!uunet!in2.uu.net!news.spss.com!uchinews!ncar!gatech!newsfeed.internetmci.com!howland.reston.ans.net!news.moneng.mei.com!news.sol.net!news.inc.net!news From: rvanzant Newsgroups: rec.radio.amateur.antenna Subject: Re: All spammers please read was (Re: WI Hams Please read! Date: 31 Jan 1996 14:43:36 GMT Organization: van.inc.net Lines: 14 Message-ID: <4env6o$lhv@news.inc.net> References: <4ecli3$elt@hummin.sol.net> <1996Jan27.133555.1413@ke4zv.atl.ga.us> NNTP-Posting-Host: van.inc.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12 (X11; I; Linux 1.3.59 i486) X-URL: news:1996Jan27.133555.1413@ke4zv.atl.ga.us > Please everyone, use the Distribution attribute properly for >locale specific postings. If you don't know how, ask your provider. >If he tells you his system won't permit it, demand he fix his system. >Every usenet message has a Distribution attribute in the header, and >every system has to have a way to set it to some value. There are a variety of ways to get on the net these days, and various newsreaders too numerous to mention. Of course they all *should* offer the Distribution option you mention, but not all do. As far as I know, Netscape 1.1 (the one I use) doesn't. Correct me if I'm wrong. Newer versions may, but I prefer the L&F of 1.1. rvz N9ORG From lwbyppp@epix.net Mon Feb 05 21:19:59 1996 Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 31 Jan 1996 15:26:19 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 32 Sender: root@newsbf02.news.aol.com Message-ID: <4eoj9b$ii@newsbf02.news.aol.com> References: <4eo6hs$3ck@news.tamu.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4eo6hs$3ck@news.tamu.edu>, mluther@tamu.edu writes: >I think that the vertical's radiation pattern will show one that it has a >much >broader total range of vertical angle coverage that that dipole did. Quite >probably, the dipole was just better optimized at the SPECIFIC range of >vertical takeoff and arrival angles that were required for the path. > >It would be interesting to know what comparative results were off the >ends of the dipole and for very long paths, if you can recall or have them >noted. > >As thorough as you are, I'll bet that is in your notes as well. > > Well I never found that out. The dipole was broadside due E and W, and there is virtually no propagation on 160 over the north magnetic pole! As for south, we worked anything we heard, but not much was on in 1973. VP8KF reported the vertical at 599, and the dipole was 589. PY1DVG said they were about equal. I'll take that penalty for the extra consistant two S units we kept getting into EU, Asia, and VK/ZL.....and the fact the local noises were barely audible at S1. Now if I could just phase two dipoles......and add some slewing. ;-) 73 Tom From lwbyppp@epix.net Mon Feb 05 21:20:00 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!raven.cybercomm.net!richg From: richg@raven.cybercomm.net (Rich Griffiths) Newsgroups: rec.radio.amateur.antenna Subject: Re: Grounding? Date: 31 Jan 1996 15:29:30 GMT Organization: CyberComm Online Services Lines: 22 Message-ID: <4eo1sr$lue@crow.cybercomm.net> References: <4emote$hvh@ns2.ptd.net> NNTP-Posting-Host: raven.cybercomm.net X-Newsreader: TIN [version 1.2 PL2] George (georgef@postoffice.ptd.net) wrote: : I have a townhouse and my radio equipment on the second floor. I'm : thinking of running a ground wire down the outside of the house (going : through the window right next to my radios) and driving a rod into the : ground. Question 1) will this help get rid of noise on my ICOM R71A : caused by my computer? 2) what gauge wire should I use? & 3) what : length of ground rod should I use to see some results? : Thanx from a very RF Noisy Shack (maybe someday I'll see the WX Fax!) : George. Unfortunately, George, it almost certainly will not work. If you don't already have a decent DC ground, you might run that wire anyway, but it's not likely to solve RFI from a computer. Computers that were not constructed to avoid RFI (many of the inexpensive IBM clones, and others) generally cannot be "fixed" using any practical measures. You could get lucky, but usually the only sure fix is to get a different computer. ============================================================ Rich Griffiths richg@raven.cybercomm.net Red Bank, New Jersey W2RG Monmouth County FN20wi From lwbyppp@epix.net Mon Feb 05 21:20:01 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!daily-planet.execpc.com!homer.alpha.net!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom19!faunt From: faunt@netcom19.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: Transformer for Screwdriver type antenna In-Reply-To: Paul Reedy's message of Wed, 31 Jan 1996 01:51:16 GMT Message-ID: Sender: faunt@netcom19.netcom.com Organization: at home, in Oakland References: Date: Wed, 31 Jan 1996 16:09:43 GMT Lines: 19 Newsgroups: rec.radio.amateur.antenna From: Paul Reedy Date: Wed, 31 Jan 1996 01:51:16 GMT Apparantly, with the transformer, you don't need the relays to switch in and out, reducing complexity, However I don't know how effective this really is. I would like to have the information on this transformer, as a friend of mine tried making a screwdriver ant. and went back to his Hustler after not being able to get his SWR down. Please let me know where I can get the specs on this transformer design, so I can forward it to him. Check with Don, W6AAQ, Box 595, Esparto CA 95627. His document package says it's a unun of 14 bifilar turns (I think) #18 wound on a T106-2 core, tapped at 11 turns from the input. The "I think" is because I can't quite read my copy. 73, doug From lwbyppp@epix.net Mon Feb 05 21:20:02 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!sol.ctr.columbia.edu!news.oberlin.edu!ocvaxa.cc.oberlin.edu!PRUTH From: pruth@ocvaxa.cc.oberlin.edu Newsgroups: rec.radio.amateur.antenna Subject: One day of sky-high SWR in a dual-band vertical Date: 31 Jan 1996 16:15:03 GMT Organization: Oberlin College, Oberlin, Ohio Lines: 11 Message-ID: <4eo4i7$rtk@news.cc.oberlin.edu> Reply-To: pruth@ocvaxa.cc.oberlin.edu NNTP-Posting-Host: alpha.cc.oberlin.edu Two days ago during a very windy day the SWR of the Valor Pro-Am 555 3-section 16.5' vertical shot up to 5:1. This SWR persisted into the night. The next morning it returned to normal. It has never done this before, even on windier days. The coax is fairly new 9913- equivalent, tightly connected to S0-239, wrapped with electrical tape and protected with metal sleeve at the base of the antenna. Could moisture be getting inside the radome from these temperature extremes we're having lately in northern Ohio? Anyone have this happen to their vertical? Any way to prevent it from recurring? Thanks for your advice/warning/reassurance. --Bill KB8USZ pruth@alpha.cc.oberlin.edu From lwbyppp@epix.net Mon Feb 05 21:20:03 1996 Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!sol.ctr.columbia.edu!news.oberlin.edu!ocvaxa.cc.oberlin.edu!PRUTH From: pruth@ocvaxa.cc.oberlin.edu Newsgroups: rec.radio.amateur.antenna Subject: Safe distance between dipole feedpoint and metal mast? Date: 31 Jan 1996 16:25:25 GMT Organization: Oberlin College, Oberlin, Ohio Lines: 8 Message-ID: <4eo55l$rvm@news.cc.oberlin.edu> Reply-To: pruth@ocvaxa.cc.oberlin.edu NNTP-Posting-Host: alpha.cc.oberlin.edu I have the apex of a coax-fed inverted v hanging from the top of a 20-foot metal mast, and the feedpoint is about 5-6" away from the mast. I've read that it's necessary to keep ladder line away from metal, but I haven't found any information regarding how close the feedpoint of a dipole can get to metal without affecting the performance of the dipole. Should I move it further away from the mast? If so, how far? Thanks again! --Bill KB8USZ pruth@alpha.cc.oberlin.edu From lwbyppp@epix.net Mon Feb 05 21:20:04 1996 Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!agate!howland.reston.ans.net!newsfeed.internetmci.com!nwgw.infi.net!news.infi.net!usenet From: bhinkle@nc5.infi.net (Barry Hinkle) Newsgroups: rec.radio.amateur.antenna Subject: 440 Horizontal Mobile Ant? Date: 31 Jan 1996 16:31:50 GMT Organization: Customer of InfiNet Lines: 8 Message-ID: <4eo5hm$n8b@nw002.infi.net> NNTP-Posting-Host: h-addle.ekx.infi.net Mime-Version: 1.0 X-Newsreader: WinVN 0.99.3 Does anyone know where I can get a 440 horizontal mobile antenna? Our ATV repeater is horizontal so I need an omni 440 horizontally polarized mobile antenna for mobile atv. TNX & 73 Barry - KT4DQ From lwbyppp@epix.net Mon Feb 05 21:20:05 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news From: mluther@tamu.edu Newsgroups: rec.radio.amateur.antenna Subject: Re: WANTED : GREAT 80 METER DX ANTENNA Date: 31 Jan 1996 16:49:00 GMT Organization: Texas A&M University, College Station, TX Lines: 47 Message-ID: <4eo6hs$3ck@news.tamu.edu> References: <4elaj2$j89@usenet.continental.com> <4eo1lk$ov7@newsbf02.news.aol.com> Reply-To: mluther@tamu.edu NNTP-Posting-Host: 128.194.44.220 X-Newsreader: IBM NewsReader/2 v1.2 In <4eo1lk$ov7@newsbf02.news.aol.com>, w8jitom@aol.com (W8JI Tom) writes: >Hi Paul, > >In article <4elaj2$j89@usenet.continental.com>, Paul Christensen > writes: > >>Tom: >> >>I would think that a 1/2 al vertical would be tough to beat for the >>really long-haul DX on 160. >Best 160 antenna I ever used was a dipole at 330 feet or so. I want one >again. It beat my 1/4 wl vert by 10 dB into Eu night after night, and out >received my Beverages by a bunch! Thats all I want, I'm not greedy. > >73 Tom > > Yeah, that's like a sloop sailing alongside a good row of cannon in a sea battle. If you're broadside you get to find out how 3db extra feels! Besides that, dipoles aren't as well grounded in romancing the stones below them as are verticals. Score another 3 db or so. The last 3 db are a little harder to imagine as the fatal salvo comes. Perhaps they come from the fact that optimum arrival angles on 160 are up in the, what, 20 degree or so range? I think that the vertical's radiation pattern will show one that it has a much broader total range of vertical angle coverage that that dipole did. Quite probably, the dipole was just better optimized at the SPECIFIC range of vertical takeoff and arrival angles that were required for the path. It would be interesting to know what comparative results were off the ends of the dipole and for very long paths, if you can recall or have them noted. As thorough as you are, I'll bet that is in your notes as well. :) Mike W5WQN as a guest at leviatha.tamu.edu From lwbyppp@epix.net Mon Feb 05 21:20:07 1996 Path: news.epix.net!news.sprintlink.net!news.netnet.net!en.com!news.his.com!news.akorn.net!imci3!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!jeefers.microdes.com!usenet From: Dave Hand Newsgroups: rec.radio.amateur.antenna Subject: Re: covenants and antenna restrictions Date: 31 Jan 1996 17:16:29 GMT Organization: Micro Design International, Inc. Lines: 31 Message-ID: <4eo85d$pl7@jeefers.microdes.com> References: <4egl0v$d71@news.asu.edu> NNTP-Posting-Host: dhand.microdes.com cjpratsj@aztec.asu.edu (CAMILLE J. PRAT, SJ) wrote: > > > A QST -- Lately, some posters have asked for info about actions > regarding antenna restrictions. I know I've seen some specific > cases somewhere, but forgot to mark where. (Hope others learn > from this mistake!) > > For the interested, some info is available at this URL: > http://www.accessone.com/~vbook/hronline.htm > > Once you're in, click the "Ham Radio On-Line Library" and look > for "Complete Formatted PRB-1 text concerning Antenna > Ordinances". > > This is general information and somewhat heavy reading, but at > least it's solid and a start.... > > Hope this helps ---- Camille Prat KB7LBN cjpratsj@aztec.asu.edu > -- I believe the state of Florida passsed a law that was suposed to prevent local zoning from preventing ham towers, anyone have any info on it??? If so I would like to get a copy. thanks Dave hand wb4hyp dhand @ microdes.com From lwbyppp@epix.net Mon Feb 05 21:20:08 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!chnews!usenet From: Cecil Moore Newsgroups: rec.radio.amateur.antenna Subject: Re: Off-Center Fed (OCF) Dipole?? Date: 31 Jan 1996 17:52:11 GMT Organization: Intel Corporation, Chandler, AZ Lines: 15 Distribution: world Message-ID: <4eoa8b$1b5t@chnews.ch.intel.com> References: NNTP-Posting-Host: cmoore.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) ericr@access2.digex.net (Eric Rosenberg) wrote: > >I'm looking for information on hte off-center fed dipole, as mentioned by >Bill Orr in CQ Magazine last year and briefly written up in the ARRL >Antenna Book. Hi Eric, I ran one of these in college. The antenna is 180 degrees (half-wave) on 80m and 360 degrees (full-wave) on 40m. Since sin(60deg) = sin(120deg), a point 1/3 from the end will give approximately the same impedance for 80m and 40m. IMO, it still needs an antenna tuner but is not a bad match for 300 ohm ladder-line. Radiation pattern favors the long section. 73, Cecil, KG7BK, OOTC (not speaking for my employer) From lwbyppp@epix.net Mon Feb 05 21:20:09 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in1.uu.net!iglou!iglou.com!n4lq From: n4lq@iglou.com (Steve Ellington) Subject: Re: Safe distance between dipole feedpoint and metal mast? X-Nntp-Posting-Host: iglou2 Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services (1-800-436-4456) X-Newsreader: TIN [version 1.2 PL2] References: <4eo55l$rvm@news.cc.oberlin.edu> Date: Wed, 31 Jan 1996 18:35:46 GMT Lines: 20 If that were a big problem then how could a beam antenna work considering they all have metal booms and sit on metal poles on metal towers? What I usually do is go to the hardware store and buy a pvc tee for plastic pipe of the size that will stick in the top of the mast. Then drill a hole in each arm for the dipole wires. Now you have an instant insulator that will last for years. pruth@ocvaxa.cc.oberlin.edu wrote: : I have the apex of a coax-fed inverted v hanging from the top of : a 20-foot metal mast, and the feedpoint is about 5-6" away from : the mast. I've read that it's necessary to keep ladder line : away from metal, but I haven't found any information regarding how : close the feedpoint of a dipole can get to metal without : affecting the performance of the dipole. Should I move it : further away from the mast? If so, how far? Thanks again! : --Bill KB8USZ pruth@alpha.cc.oberlin.edu -- Steve Ellington N4LQ@IGLOU.COM Louisville, Ky From lwbyppp@epix.net Mon Feb 05 21:20:10 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!news.greatbasin.net!usenet From: NC7K@VHF.RENO.NV.US Newsgroups: rec.radio.amateur.antenna Subject: Re: 6 mtr. loops Date: 31 Jan 1996 19:30:12 GMT Organization: OS/2 Kicks WIN95 anyday Lines: 24 Distribution: world Message-ID: <4eog04$ffd@news.greatbasin.net> References: Reply-To: NC7K@VHF.RENO.NV.US NNTP-Posting-Host: vhf.reno.nv.us X-Newsreader: IBM NewsReader/2 v1.2.5 In , cmassey@onramp.net (clev e e massey) writes: >Has anyone experimented with loops for 6 mtrs.? I have a two element quad >for six, but am thinking that for the minimum F/B it gives me, I might try >building a couple of loops and phasing them at the same height...I know I >would now have an omnidirectional sig, but the gain of around 8 db might >just help my QRP sig a bunch more... > >Any thought would be appreciated.. > >Pse e-mail direct... > >tnx...cleve/wd5bor Cleve... I use the KB6KQ line of Horizontal omnidirectional loops while mobile with great sucess. Norm makes wonderfull antennas that not only work well but are works of art to look at. The 6m Loop is 24" in diameter and $65.00 + shipping. Contact Norm - KB6KQ at (310)925-0733 for more info. I have no financial ties to Norm, I just love his antennas! Tim - NC7K... From lwbyppp@epix.net Mon Feb 05 21:20:11 1996 Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: LawyerJoe@aol.COM Newsgroups: rec.radio.amateur.antenna Subject: subscribe Date: 31 Jan 96 19:54:14 GMT Organization: ucsd usenet gateway Lines: 1 Message-ID: <960131145413_132406267@emout08.mail.aol.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu subscribe From lwbyppp@epix.net Mon Feb 05 21:20:12 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!ind-001-236-92 From: mai@iquest.net (Patrick Croft) Subject: Re: Patch antenna X-Nntp-Posting-Host: ind-001-236-92.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: Date: Wed, 31 Jan 1996 21:08:21 GMT Lines: 27 Jean-Yves Perrier wrote: >Hello, > >I've heard about a "patch antenna". I don't know what it look like, >neither where it is used (!). > >Does somebody know something about it, or can point some references to >me ? > >Thanx in advance. > >-- >Jean-Yves Perrier > > Have a friend in Japan telling me these are popular cellphone accessories. Passive device, about 4 inches square, sticks on window for improved phone coverage is reported, and many wanting. I can't say anything regarding the technical side, and frankly, I don't understand how a antenna with gain can be of value if the receiving/transmitting unit moves about. Passive coupling as I know it would be so varible under these conditions I think it'd be useless. Should you find out details, I'm interested enough to request you update us! BTW, these things are wholesaling around $20-25USD, retailing $60+USD. GL Patrick WB9IQI From lwbyppp@epix.net Mon Feb 05 21:20:13 1996 Newsgroups: rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!news1!ind-001-236-92 From: mai@iquest.net (Patrick Croft) Subject: Re: One day of sky-high SWR in a dual-band vertical X-Nntp-Posting-Host: ind-001-236-92.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: <4eo4i7$rtk@news.cc.oberlin.edu> Date: Wed, 31 Jan 1996 21:10:49 GMT Lines: 16 pruth@ocvaxa.cc.oberlin.edu wrote: >Two days ago during a very windy day the SWR of the Valor Pro-Am 555 >3-section 16.5' vertical shot up to 5:1. This SWR persisted into >the night. The next morning it returned to normal. It has never done >this before, even on windier days. The coax is fairly new 9913- >equivalent, tightly connected to S0-239, wrapped with electrical tape >and protected with metal sleeve at the base of the antenna. Could >moisture be getting inside the radome from these temperature extremes >we're having lately in northern Ohio? Anyone have this happen to >their vertical? Any way to prevent it from recurring? Thanks for >your advice/warning/reassurance. --Bill KB8USZ >pruth@alpha.cc.oberlin.edu By chance did the temp change a bunch(30+degrees)? Condensation may have got you - 9913 is known for this. Patrick From lwbyppp@epix.net Mon Feb 05 21:20:14 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w2foe@aol.com (W2FOE) Newsgroups: rec.radio.amateur.antenna Subject: Re: Yagi design and tuning ?'s Date: 31 Jan 1996 21:34:25 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4ep8rh$8pm@newsbf02.news.aol.com> References: <4ekqnt$2qno@info4.rus.uni-stuttgart.de> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader I haven't seen that particular software package but the ones I have used normally allow you to optimize for 3 parameters: gain, front to back, and swr. Somewhere there may be the perfect antenna in which gain (at the proper elevation angle), and front to back (how ever you wish to define it) are optimal at the same point; and the impedance is purely resistive and 50 ohms at exactly the frequency you wish. Unfortunatelyl, no one has ever found it. Point is, in reality your antenna may not be designed for a 1/1 swr. Regards, Merv From lwbyppp@epix.net Mon Feb 05 21:20:15 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!ns3.iamerica.net!usenet From: Darrell Barabash Newsgroups: rec.radio.amateur.antenna Subject: Re: Help calculating transmission power Date: Wed, 31 Jan 1996 23:17:03 -0600 Organization: iAmerica, Inc. Lines: 17 Message-ID: <31104CCF.1D22@iamerica.net> References: <4ehf8e$bhl@shadow2.qnetix.ca> <822905252snz@microvst.demon.co.uk> NNTP-Posting-Host: iad_ppp0214.iamerica.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) To: tgold@microvst.demon.co.uk > > Transmitting > > Receiving > > > > Gain= 10db > > Gain=40 db > Given microwave frequencies, the gain is usually specified as dBi (i.e. dB above an isotropic radiator). So, given that, the required transmitter power is +2 dBm (1.8 mW). But, don't forget to increase that to account for feedline losses, pointing error (especially the 40dBi antenna) and fading margin. There are other factors too but those are some of the more significant ones. Darrell Grapevine, TX From lwbyppp@epix.net Mon Feb 05 21:20:16 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci5!imci4!newsfeed.internetmci.com!in1.uu.net!ns3.iamerica.net!usenet From: Darrell Barabash Newsgroups: rec.radio.amateur.antenna Subject: Re: Patch antenna Date: Wed, 31 Jan 1996 23:24:59 -0600 Organization: iAmerica, Inc. Lines: 24 Message-ID: <31104EAB.476B@iamerica.net> References: NNTP-Posting-Host: iad_ppp0214.iamerica.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) To: Jean-Yves Perrier Jean-Yves Perrier wrote: > > I've heard about a "patch antenna". I don't know what it look like, > neither where it is used (!). > > Does somebody know something about it, or can point some references to > me ? > A patch antenna can be made out of double sided PC board. One side is left as a ground plane and the other has the antenna "patch" etched out of the copper. The patch is usually rectangular or nearly square but could also be round or elliptical. The dimensions are chosen to resonate at the desired operating frequency. These antennas are flat (very low profile) and are generally used in the GHz frequency area. They can be arrayed to generate high gain, electrically steerable antennas, etched out of one big piece of PCB material. The material is not usually fiberglass -- more often Teflon, PTFE or ceramic. Darrell Grapevine, TX