Date: Fri, 10 Jun 94 04:30:22 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 #177 To: Ham-Ant Ham-Ant Digest Fri, 10 Jun 94 Volume 94 : Issue 177 Today's Topics: --> Need Antenna Specs! <-- (2 msgs) Antenna FTPs Comet "Miracle Baby" 2m HT Antenna GAP Titan vs MFJ-1798 vs R-7 (?) Has anyone used NLNEC? Way to increase power of whip antenna on FM receiver? Yagi ant program 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: 9 Jun 1994 14:23:04 -0400 From: newstf01.cr1.aol.com!search01.news.aol.com!not-for-mail@uunet.uu.net Subject: --> Need Antenna Specs! <-- To: ham-ant@ucsd.edu In article <2s9fdh$ouk@usenet.INS.CWRU.Edu>, ew032@cleveland.Freenet.Edu (Steve A. Miller) writes: The easyest 2m/440 ant there is to build is the SO239 ground plane. here's how to build it: Parts list: 1-SO239 4-peices #12 Copper wire stripped @ 20 3/16" ( you can also use brazing wire 3/32") 1-#12 Copper wire stripped 19 5/16" (you can use 3/32 brazing wire) 4-small nuts and bolts (to fit your mounting holes in the so239) solder and a torch Construction: Bend a loop in the ends of the four radials to accept the bolts, mount them around the SO239 one at a time, be careful not to apply to much heat, you can very easily melt the insulator. let the project cool down after each radial is attached. Once you have attached all four radial, attach the radiator (driven element ). You must bend all four radials to 45 deg. downward. That's all there is to it. Tune it as needed, you should achive a very good match at 146 and 446 ( less than 1.2/1) Have fun Randy ------------------------------ Date: 9 Jun 1994 20:12:01 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!msuinfo!netnews.upenn.edu!eniac.seas.upenn.edu!depolo@network.ucsd.edu Subject: --> Need Antenna Specs! <-- To: ham-ant@ucsd.edu In article <2t7mm8$dr5@search01.news.aol.com> randy753@aol.com (Randy753) writes: >In article <2s9fdh$ouk@usenet.INS.CWRU.Edu>, >ew032@cleveland.Freenet.Edu (Steve A. Miller) writes: > >The easyest 2m/440 ant there is to build is the SO239 ground plane. >here's how to build it: [deleted - basically you make a 1/4 wave 2m groundplane] >Tune it as needed, you should achive a very good match at 146 and 446 >( less than 1.2/1) You get a decent match, but terrible 440 performance. The 1/4 wave on 2m acts like a 3/4 wave on 440, having a major lobe at a high angle from the horizon, which might be OK for talking to the birds, but not to terrestrial stations like repeaters or mobiles. By putting a coil at the bottom and shortening the radiator to approx. 15.5", you should be able to get a 5/8 wave whip on 440 and a slightly-base-loaded 1/4 wave on 2m. You'll end up with a dual-band antenna that has much better 440 performance than a 3/4 wave whip. Just a thought... --- Jeff -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Jeff DePolo WN3A Twisted Pair: (215) 337-7383H 387-3059W depolo@eniac.seas.upenn.edu RF: 443.800+ MHz 442.400+ MHz 24.150 GHz ------------------------------ Date: Thu, 9 Jun 1994 15:47:06 GMT From: ihnp4.ucsd.edu!swrinde!pipex!bbc!ant!boyer@network.ucsd.edu Subject: Antenna FTPs To: ham-ant@ucsd.edu John Hess (johnhess@indial1.io.com) wrote: : I am a fairly new InterNet user. Are there any FTPs that specialize in : (or have) programming for antenna design? : John Hess : johnhess@indial1.io.com try ftp.netcom.com in the pub/rander/NEC directory. John B John.boyer@rd.eng.bbc.co.uk ------------------------------ Date: Thu, 9 Jun 1994 16:49:33 GMT From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!gatech!nntp.msstate.edu!saimiri.primate.wisc.edu!sal.wisc.edu!zimmer!zimmer.csufresno.edu!rafaels@network.ucsd. Subject: Comet "Miracle Baby" 2m HT Antenna To: ham-ant@ucsd.edu Any experiences with this little (2 in.) rubber thingy? Is it worth it to spend $37 for just a smaller size than a regular rubber ducky? I own a Yaesu FT11R and I thought that this antenna could complement this xceiver because of its size. Thanks. 73, Rafael (waiting for ticket) ******************************************************************* Rafael Solis, Professor Craig School of Business rafaels@zimmer.csufresno.edu California State University, Fresno (209)278-2194 (209)278-4911 (Fax) ******************************************************************* ------------------------------ Date: 9 Jun 1994 15:03:25 GMT From: ihnp4.ucsd.edu!usc!math.ohio-state.edu!news.acns.nwu.edu!usenet@network.ucsd.edu Subject: GAP Titan vs MFJ-1798 vs R-7 (?) To: ham-ant@ucsd.edu In article <2t57l5$sg7@news.ysu.edu> ap451@yfn.ysu.edu (Justin Randall Padawer) writes: > >Since the magazines are too afraid to do a real head-to-head >comparison of the three no-radials all-band HF verticals, >why don't we try to put something together here? (The >get-a-beam and get-a-real-radial-vertical comments would >be unwelcome; the purpose would be to compare these three >space-compromise antennas.) Anyone who has had experience >with 1) the GAP Titan, a brand new no-radial 80-10 offering, >or its mini-radialed cousin, the GAP Challenger, 2) the >finally-shipping MFJ 10-band Model 1798, or 3) the 40-10 >meter no-radial trap vertical, the Cushcraft R-7, please >forward your comments. I'll post a comprehensive summary. The only antenna of the above with which I have experience is a GAP Voyager IV - which is a compromise antenna - no kidding. Is that similar to a GAP Titan? This antenna is 45 feet tall with a six foot dia top hat. Worked well on 40, mediocre to bad on 20, bad on 80 and sucked boulders on 160. Since you do not want to hear about real-radial-vertical I will not bore you with the details of how a Cushcraft AP8A beat it in every band in head to head comparison for DX reception. Yes, the AP8A has four sets of five radials ( for different bands ) in a ground plane configuration, abt 10 ft off the terra firma. I have counseled a number of hams in my club to use regular multiband verticals with radials instead of the much more expensive compromises. It is not question that an R7 requires much less real estate. However, the radials are not that hard to put up. Even one radial will provide good but directional coverage. You can load them with coils, lay them on a roof (not great but better than having a 3 foot stub), bend them etc preferably not slope up or switch back. Rajiv aa9ch r-dewan@nwu.edu ------------------------------ Date: Thu, 9 Jun 1994 16:47:10 GMT From: news!wrs.com!jerald@uunet.uu.net Subject: Has anyone used NLNEC? To: ham-ant@ucsd.edu Has anyone out there used NLNEC, the antenna modeling package for the PC that is sold for $49.00? How does it compare to mininec or nec2 or any of the other antenna modeling packages out there? If someone is a NLNEC licensee, how is the documentation? At what level of expertise is the documentation directed? Many Thanks, 73 de KC6RTO Jerry Pendleton --- -- Jerald R. Pendleton Email: jerald@wrs.com, Personal Email: jrpend@netcom.com The preceeding message represents only the opinon of the author. This do not represent the opinions/positions of Wind River Systems, my mother, my wife or my poodle. ------------------------------ Date: 9 Jun 1994 17:36:36 GMT From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!netline-fddi.jpl.nasa.gov!marsupial.jpl.nasa.gov!zipkid.jpl.nasa.gov!kirk@network.ucsd.edu Subject: Way to increase power of whip antenna on FM receiver? To: ham-ant@ucsd.edu I have a AM/FM radio with a whip-type FM antenna perhaps a meter long. There is a marginal station I'd like to listen to. How do I increase the capability of the antenna? Thanks! -- Kirk Reinholtz, kirk@zipcode.jpl.nasa.gov, 818-354-6419 ------------------------------ Date: 8 Jun 94 03:00:00 GMT From: dog.ee.lbl.gov!agate!iat.holonet.net!wwswinc!frank.mcjunkins@ucbvax.berkeley.edu Subject: Yagi ant program To: ham-ant@ucsd.edu I'm looking for an antenna design program for VHF/UHF quad/yagi type antennas. Someone suggested that I obtain a program called AO 6.0, but I'm not able to locate that program. Can anyone steer me towards either that program, or one that will allow me to plug in frequencies, and number of elements, and have the program do the work for me? I would prefer NOT to have a basic program, but will put up with it if that's all that's available. --- Fmail 0.98+/RA 2.01+ * Origin: Boone's Farm BBS, Seattle, WA (206)282-2851 (1:343/124) ------------------------------ Date: Thu, 9 Jun 1994 14:15:55 GMT From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!dgf@network.ucsd.edu To: ham-ant@ucsd.edu References , , Subject : Re: Balloon In article dts@world.std.com (Daniel T Senie) writes: >In article mack@ncifcrf.gov (Joe Mack) writes: >>the outer about every 5 secs. So make sure the cable is DC earthed. you >>could fry your front end. My Cushcraft 402BA (2L 40M) does this whenever it rains. Before I figured out what was happening, I left my Ten-Tec 509 & 405 on during a rainstorm, and it took out the *driver* of the argonaut (not the final) and the SWR bridge diodes in both the argonaut and the amplifier. Took me a while to find the "ticking" sound in my shack whenever it rained. All other antennas were DC grounded from factory - only the 402 has this "defect". 73 Dave WB0GAZ ------------------------------ End of Ham-Ant Digest V94 #177 ******************************