Date: Sat, 7 May 94 04:30:18 PDT From: Ham-Ant Mailing List and Newsgroup Errors-To: Ham-Ant-Errors@UCSD.Edu Reply-To: Ham-Ant@UCSD.Edu Precedence: Bulk Subject: Ham-Ant Digest V94 #134 To: Ham-Ant Ham-Ant Digest Sat, 7 May 94 Volume 94 : Issue 134 Today's Topics: 2m Amplifier mounted at antenna? Antenna on Saturn COMMENTS on the ASA 2m antenna Help w/ 'RF Design' Mag. Article 1/88 back issue Homebrew antenna questions (2 msgs) Loading the boom on a monobander. Looking for tower info (2 msgs) MFJ-1798...Another Vapor Product? WANTED 10-30 MHz Directional Antenna Send Replies or notes for publication to: Send subscription requests to: Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the Ham-Ant Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant". We trust that readers are intelligent enough to realize that all text herein consists of personal comments and does not represent the official policies or positions of any party. Your mileage may vary. So there. ---------------------------------------------------------------------- Date: 6 May 94 16:08:20 GMT From: agate!howland.reston.ans.net!wupost!gumby!newsxfer.itd.umich.edu!news1.oakland.edu!rcsuna.gmr.com!rcsuna.gmr.com!vbreault@ucbvax.berkeley.edu Subject: 2m Amplifier mounted at antenna? To: ham-ant@ucsd.edu In article <42234.wosborne@nmsu.edu> "William P. Osborne" writes: Val Breault wrote: >Use a power supply that has remote sensing capability. You run the power >and sense lines up to the load. The power supply will adjust it's output >to achieve 12V at the load point. Intresting idea but one must be very careful of loop bandwidth problems in the power supply when the modulation is cw or ssb as it is in satellite Bill and I traded E-mail and came up with what sounds like a good way to get regulated 13 Volts up to the top of a tower without resorting to placing the power supply there. How about running oh, say, 18 Volts up to a pass regulator mounted near the amplifier. The regulator need not be very large or heavy so it will not have a large effect on the tower loading. If we presume the amp draws 2A idle and 20A at full load, and assuming the voltage drop in the power line is 3 volts under full load then the regulator needs only to be able to dissapate 40 Watts. (18V_source - 3V_drop - 13V_load) * 20A = 40W dissapation full load (18V_source - nearly_zero - 13V_load) * 2A = 10W dissapation when idle Anyone care to take another crack at it? -- Val Breault - N8OEF - vbreault@gmr.com \ /| Instrumentation dept GM NAO R&D Center \ / | My opinions are not necessarily those of \ /__| GMR nor of the General Motors Corporation \/ |___ ------------------------------ Date: 7 May 94 00:55:43 GMT From: agate!msuinfo!netnews.upenn.edu!news.drexel.edu!news.ge.com!knight.vf.ge.com!cnn.motown.ge.com!wintermute.motown.ge.com!user@ucbvax.berkeley.edu Subject: Antenna on Saturn To: ham-ant@ucsd.edu In article <2dc5c170@f747.n115.z1.fidonet.org>, Fred.Spinner@f747.n115.z1.fidonet.org (Fred Spinner) wrote: > How great can a car be if its made out of such flimsy material? Pretty darn great ('94 Saturn SL2). :-) The body panels and roof are flexable, and will absorb impacts that will dent normal cars, and bounce back, sometimes without even a scratch on the paint. What I did was run a magmount to the trunk lid (which is metal). Bob (N2KGO) -- Bob Snyder rsnyder@motown.ge.com When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. ------------------------------ Date: 6 May 94 13:08:49 GMT From: ihnp4.ucsd.edu!library.ucla.edu!psgrain!charnel.ecst.csuchico.edu!olivea!news.bu.edu!taco.cc.ncsu.edu!raz!sagris@network.ucsd.edu Subject: COMMENTS on the ASA 2m antenna To: ham-ant@ucsd.edu dgordon@sadira.gb.nrao.edu (David Gordon) writes: >What were the comments (pro/cons) on the ASA 2m base >antenna? Could you re-post them and or email them to >me? Thanks... Ive asked locally about this antenna as well, so far ive heard nothing bad but i havent gotten many comments. Please post any comments from people who have one as im thinking of getting one as well. Thanks, KB4BBA. -- ------------------------------------------------------------------------------- Chris Sagris. ARS-KB4BBA PP-ASEL NAUI Bell Northern Research Inc. (std. disclaimer applies) Internet: sagris@raz.csc.ncsu.edu (152.1.58.11) or sagris@bnr.ca (192.58.194.73) ------------------------------ Date: 06 May 1994 03:34:55 GMT From: yale.edu!noc.near.net!chaos.dac.neu.edu!chaos.dac!dean@yale.arpa Subject: Help w/ 'RF Design' Mag. Article 1/88 back issue To: ham-ant@ucsd.edu Hi: I'm posting this for a friend. -Dean from Thomas: Hi: Does anyone read RF Design? I'm looking for an article entitled 'Simple Spectrum Analyzer, A Pocket Sized 0-100 Mhz Unit Uses Only Three IC's' by A. Halfrick. I believe it's in the Jan. 88 issue. If so, could I please have a copy or an adress to retrieve that issue? Thanks in advance. -Thomas ------------------------------ Date: Fri, 6 May 1994 13:12:10 GMT From: wri!pea@uunet.uu.net Subject: Homebrew antenna questions To: ham-ant@ucsd.edu Cecil - This weekend I'm unclamping the homebrew helical and hoisting up an inverted v dipole - 200' fed with ladder line into my mfj dif-t tuner. I believe life will be much simpler with this arrangement! Thanks for the note... 73 de Bruce, N9WKE ------------------------------ Date: Fri, 6 May 1994 13:06:42 GMT From: wri!pea@uunet.uu.net Subject: Homebrew antenna questions To: ham-ant@ucsd.edu > >Hi Bruce, I ran some simulations on your antenna on ELNEC last night >and found the following: > >It would be extremely interesting to measure the feedpoint impedence >on all the bands. Question is, is your antenna so inductive that it >is resonant at only one frequency... like a big coil? > >73, KG7BK, CecilMoore@Delphi.com Cecil - I was hoping you would do what you did! I have spoken to a couple of other folks about this antenna and it seems as though it will only be resonant on 80m :-( 73 de Bruce, N9WKE ------------------------------ Date: 6 May 1994 15:17:46 GMT From: ihnp4.ucsd.edu!sdd.hp.com!col.hp.com!fc.hp.com!news.lvld.hp.com!bills@network.ucsd.edu Subject: Loading the boom on a monobander. To: ham-ant@ucsd.edu In article , Rick Zabrodski (zabrodsk@med.ucalgary.CA) wrote: > [...] I read in the NCJ several years ago a > reference to loading the boom of a 20 meter yagi for 40 meters. In theory > it should work on several bands as a rotatable dipole. Does anyone have > any experience with this? Does one isolate the boom from tower? Could the > boom be fed with ladder line? You may be referring to an article in the mid 70s in QST when a guy put a loaded 40M dipole under the boom of a TH6DX. He actually built a seperate dipole and slung it from under the TH6's boom. Yes, I believe it was insulated from the TH6 boom. Check back issues of QST (December issues have yearly indexes). Seems like it was before they went to the larger format, so that would make it the early 70s. Bill Bill Standerfer * Hewlett-Packard Company CFI-A, IA, ME * VXI Systems Division bills@lvld.hp.com * Loveland, CO 80539 Baron N222AB - KF0DJ - Pikes Peak 253 * 303-679-2378 ------------------------------ Date: 6 May 94 20:17:47 GMT From: agate!howland.reston.ans.net!math.ohio-state.edu!darwin.sura.net!coil!emerald.nist.gov!proctor@ucbvax.berkeley.edu Subject: Looking for tower info To: ham-ant@ucsd.edu In article <2qdu4n$itk@agate.berkeley.edu> ron@etch-eshop.Berkeley.EDU (Ronald Viegelahn) writes: -> I have stumbled upon a Higain tower, 45 ft 2 piece crank up. -> -> Does anyone happen to have an idea as to how big the block of -> cement needed to hold this down would be ? -> -> How much does something like this weight ? -> -> Basicaly I'm wondering what would I be getting into, putting -> something like this up. -> -> 73 -> -> Ron Viegelahn KE6GLZ -> -> ron@etcheshop.Berkeley.EDU -> You might start with HyGain. If you are going to get a building permit (which you "need" to do in most, if not all, areas) then you will need the Engineering drawings, specifications, etc, to get the permit. 73 - Jim, KE3HO -- James E. Proctor | proctor@onyx.nist.gov | National Inst. of Stand. & Tech. My opinions are my own. I have the receipt to prove it. "Waiter, this food has snails in it!" - Lucy Ricardo in French Resturant "I feel like roadkill on the Information Superhighway!" - Doug Marlette ------------------------------ Date: 6 May 1994 17:18:15 GMT From: ihnp4.ucsd.edu!agate!etch-eshop.Berkeley.EDU!ron@network.ucsd.edu Subject: Looking for tower info To: ham-ant@ucsd.edu I have stumbled upon a Higain tower, 45 ft 2 piece crank up. Does anyone happen to have an idea as to how big the block of cement needed to hold this down would be ? How much does something like this weight ? Basicaly I'm wondering what would I be getting into, putting something like this up. 73 Ron Viegelahn KE6GLZ ron@etcheshop.Berkeley.EDU ------------------------------ Date: 5 May 1994 18:10:22 GMT From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!ftpbox!mothost!delphinium.cig.mot.com!rtsg.mot.com!reichrt@network.ucsd.edu Subject: MFJ-1798...Another Vapor Product? To: ham-ant@ucsd.edu Anyone out there know if this "fabulous" 80 thru 2 Meter Vertical is for real? MFJ keeps stalling on the start of delivery dates but keeps advertising it! Can't get any info out of them other than it hasn't shipped yet and don't know when. MFJ was sure in a hurry to take orders back in February but I'm starting to wonder if this wasn't up front development money? Any comments? That R7 sure starting to look better and better! -- ==================================================== | KD9JQ ex KA7IXS,WA8NBD 708-632-6669 Work | \|/ | Charles H. Reichert 708-358-3827 HOME | ^ ^ | 955 Concord Ln. | ( O O ) | Hoffman Ests., IL. 60195 reichrt@rtsg.mot.com | ___.ooO__U__Ooo.___ ==================================================== Hmmmm...Could Be! ------------------------------ Date: 6 May 1994 18:19:37 GMT From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!charnel.ecst.csuchico.edu!olivea!koriel!lll-winken.llnl.gov!taurus.cs.nps.navy.mil!nps.navy.mil!usenet@network.ucsd.edu Subject: WANTED 10-30 MHz Directional Antenna To: ham-ant@ucsd.edu Hi, I need to find a directional antenna that will cover at least 10-30 Mhz or even 8-30 if possible. This is a rather urgent need. Any recommendations are welcome. If you are a in a position where you could send a quote please e-mail it to me. I need this info NLT 4pm on 10 May 1994. Thank You, Carl Forsythe forsythe@usw.nps.navy.mil forsythe@oc.nps.navy.mil crforsyt@nps.navy.mil KK6CK ------------------------------ Date: Thu, 5 May 1994 17:46:59 GMT From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!convex!news.duke.edu!godot.cc.duq.edu!newsfeed.pitt.edu!gvls1!rossi@network.ucsd.edu To: ham-ant@ucsd.edu References <2pjnao$7fe@xap.xyplex.com>, <2qadb9INN1ful@ilx018.iil.intel.com>, <2qb81m$2kk@news.nd.edu>du Subject : Re: Through-the-window on a Saturn In article <2qb81m$2kk@news.nd.edu> rnimtz@sleepy.helios.nd.edu (richard nimtz) writes: >In article <2qadb9INN1ful@ilx018.iil.intel.com> dbraun@iil.intel.com writes: >>In article <2pjnao$7fe@xap.xyplex.com>, sas@opus.xyplex.com (Scott Sminkey - Sustaining Eng Group) writes: >>|> >>|> Where do people get the idea that a properly done drilled mount causes any >>|> devaluation in the price of a car? >>.... >>|> I'll ask my usual question: can anyone cite even one single case where a >>|> properly done drilled mount resulted in devaluation? 1. Remove the ham antenna. 2. Install a cellular phone antenna. 3. Charge $100 more for "cellular ready" car. :-) ================================================================= Pete Rossi - WA3NNA rossi@vfl.paramax.COM Unisys Corporation - Government Systems Group Valley Forge Engineering Center - Paoli, Pennsylvania ================================================================= ------------------------------ Date: 5 May 1994 14:06:03 -0400 From: ihnp4.ucsd.edu!sdd.hp.com!col.hp.com!srgenprp!news.dtc.hp.com!hpscit.sc.hp.com!hpuerci.atl.hp.com!hpuerca!edh@network.ucsd.edu To: ham-ant@ucsd.edu References , <2pjnao$7fe@xap.xyplex.com>, <2qadb9INN1ful@ilx018.iil.intel.com>o Subject : Re: Through-the-window on a Saturn In <2qadb9INN1ful@ilx018.iil.intel.com> dbraun@ilx049.iil.intel.com (Doug Braun) writes: >|> I'll ask my usual question: can anyone cite even one single case where a >|> properly done drilled mount resulted in devaluation? >Yes, but can anyone cite even one single case where they have >actually SOLD a car with a antenna hole in it? That's the more >relevant question. Sure. And believe it or not, the antenna hole was not an issue (like a lot of hams, I'd managed to do enough other damage that an antenna hole/mount never came into consideration). A good friend (i.e. I know personnally and witnessed the events) did a tradein with a piece of duct tape where the antenna used to be. He was a little conserned about it and ASKED the dealer about it. Said dealer said it had not affected his judgement and that they would repair hole or just plug depending on resell considerations. I've known of other hams who routinely pull out their mounts before selling or trading their car. What's the point? A ham will decide to drill a hole for reasons that merit consideration by other hams: solid mount, ground plane connection, coax route (NOT thru door/window!), flexability (can leave mount intact and switch out antennas easily), etc. Others will decide NOT to drill for other reasons (most of which I can't defend, but that's okay too). Financial considerations hardly matter in the overall question of "do I or don't I drill"! Cheers & 73 Ed H. N5RCK ------------------------------ Date: 5 May 1994 16:48:54 GMT From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!vixen.cso.uiuc.edu!cs.uiuc.edu!news1.oakland.edu!news.nd.edu!sleepy!rnimtz@network.ucsd.edu To: ham-ant@ucsd.edu References , <2pjnao$7fe@xap.xyplex.com>, <2qadb9INN1ful@ilx018.iil.intel.com>s Subject : Re: Through-the-window on a Saturn In article <2qadb9INN1ful@ilx018.iil.intel.com> dbraun@iil.intel.com writes: >In article <2pjnao$7fe@xap.xyplex.com>, sas@opus.xyplex.com (Scott Sminkey - Sustaining Eng Group) writes: >|> >|> Where do people get the idea that a properly done drilled mount causes any >|> devaluation in the price of a car? >.... >|> I'll ask my usual question: can anyone cite even one single case where a >|> properly done drilled mount resulted in devaluation? > >Yes, but can anyone cite even one single case where they have >actually SOLD a car with a antenna hole in it? That's the more >relevant question. > I asked a car dealer about this. He said it drops the value of the car by the amount of money it takes to get the hole patched and painted. For most cars this is in the $200 to $300 range. If your car is an older model then it probably isn't worth repairing the hole. For the really curious: go to a body shop and have them estimate the cost to plug and patch the hole. DISCALMER: I have a glass mount antenna :) -Rick Nimtz -N9TJG (politically correct Technician Plus) -South Bend, Indiana ------------------------------ End of Ham-Ant Digest V94 #134 ******************************