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1. Topband: Shunt feed short tower (score: 1): Author: "Kelly Jones" <kjones@virtualcohesion.com>; Date: Mon, 5 Jun 2006 04:33:00 -0000; Sorry for the crosspost, but it was suggested that I might have better luck here... A couple of us spent the day today trying to get a shorty tower loaded for 160m. Specifically, the tower is 42 feet; /archives//html/Topband/2006-06/msg00002.html (7,489 bytes)
2. Re: Topband: Shunt feed short tower (score: 1): Author: "Larry Rockfield" <w6ub@adelphia.net>; Date: Mon, 5 Jun 2006 11:37:39 -0400; Kelly, a rough model shows feedpoint Z=2+j330 for the lower end of 160M. Expect ground losses to be high, and matching network losses alone to run 16% or greater, most likely greater. One of the L-n; /archives//html/Topband/2006-06/msg00003.html (7,328 bytes)
3. Re: Topband: Shunt feed short tower (score: 1): Author: "George (K8GG) & Marijke Guerin" <gmguerin@voyager.net>; Date: Mon, 5 Jun 2006 16:20:19 -0400; Topbanders: I just read the message from Larry, W6UB, and would like to toss in my 2 cents worth, as I think there might be a modelling error: See below with double star (**): **I would expect a mode; /archives//html/Topband/2006-06/msg00004.html (9,099 bytes)
4. Re: Topband: Shunt feed short tower (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Mon, 5 Jun 2006 21:07:59 -0700; Kelly's (N0VD) tower is too short to shunt feed on 160m with a gamma (single capacitor) match, as he's been trying to do unsuccessfully. The answer for a tower that short is to use an omega (two capa; /archives//html/Topband/2006-06/msg00005.html (7,169 bytes)
5. Re: Topband: Shunt feed short tower (score: 1): Author: topband-bounces@contesting.com (by way of Bill Tippett<btippett@alum.mit.edu>); Date: Wed, 07 Jun 2006 06:38:08 -0400; Earl, I respectfully disagree to some extent with your comments. Although I agree that omega is a good way to match a physically short tower I would not give up on the simpler gamma match just yet. T; /archives//html/Topband/2006-06/msg00007.html (10,318 bytes)
6. Re: Topband: Shunt feed short tower (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 7 Jun 2006 08:06:50 -0400; If the tower is not reasonably close to resonance a gamma will not do the trick. A short tower far from self-resonance as a Marconi is similar to a Hairpin Monopole. Earl's statement seemed accurate; /archives//html/Topband/2006-06/msg00008.html (9,734 bytes)
7. Re: Topband: Shunt feed short tower (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Wed, 7 Jun 2006 06:56:04 -0700; "Although I agree that omega is a good way to match a physically short tower I would not give up on the simpler gamma match just yet. The best matching system for feeding a grounded element, unless w; /archives//html/Topband/2006-06/msg00009.html (12,801 bytes)
8. Topband: Shunt feed short tower (score: 1): Author: "Rick N6PE" <n6pe@pacbell.net>; Date: Wed, 7 Jun 2006 09:48:20 -0700; This may be of general interest. Many years ago I shunt fed my 35 foot tower with an ABT-34 tribander on top. The tower is a tubular crank up. I ran a wire off from about 2/3s up at a 45 degree angle; /archives//html/Topband/2006-06/msg00010.html (7,849 bytes)
9. Re: Topband: Shunt feed short tower (score: 1): Author: "Kelly Jones" <kjones@virtualcohesion.com>; Date: Thu, 8 Jun 2006 03:31:36 -0000; The shortest tower without any top loading whatsoever that can be gamma matched is about 85 feet. Rohn 25 that high with the tap point at the top with 36" shunt wire spacing will have a feedpoint Z o; /archives//html/Topband/2006-06/msg00012.html (10,562 bytes)
10. Re: Topband: Shunt feed short tower (score: 1): Author: "John K9UWA" <k9uwa@arrl.net>; Date: Wed, 07 Jun 2006 22:56:35 -0500; There are a couple of things I see wrong with the models and information given... First the guy said he had a 2 element shorty 40 on top of this tower.. and that the reflector was insulated from the; /archives//html/Topband/2006-06/msg00013.html (9,588 bytes)

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