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1. [TowerTalk] Yagi designs? (score: 1): Author: "Reicher, James" <JReicher@hrblock.com>; Date: Thu, 19 Jul 2007 15:23:55 -0500; Does anyone have a good design for a home-brewed four element monoband yagi for 20 meters, and maybe a 5 element yagi for 15 meters? I prefer the CW end of the bands. 73 de N8AU, Jim in Raymore, MO L; /archives//html/Towertalk/2007-07/msg00741.html (6,653 bytes)
2. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 17:25:49 -0400; Nothing beats the W2PV designs for gain or F/B especially over just the CW band. With 4 elements on 40/27/20 foot booms for 20/15/10M the wind load is less than designs with more elements. The booms; /archives//html/Towertalk/2007-07/msg00742.html (8,511 bytes)
3. Re: [TowerTalk] Yagi designs? (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Thu, 19 Jul 2007 23:47:07 +0200; I always thought the problem with close spacing and stacking interference were not the booms, as the are not parallel to the elements, but the elements themselves? 73 Peter Nothing beats the W2PV des; /archives//html/Towertalk/2007-07/msg00744.html (9,091 bytes)
4. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 17:55:05 -0400; Only when the antenna elements share a resonance 20/10; 40/15. Booms were mostly overlooked until computers came along in everyones home and office. Many manufacturers continued schleping the same ti; /archives//html/Towertalk/2007-07/msg00745.html (10,542 bytes)
5. Re: [TowerTalk] Yagi designs? (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Fri, 20 Jul 2007 00:37:05 +0200; Hi Carl, I wonder why he is not mentioning that in his book to take precaution and avoid certain boom length? "The simplified Yagi model also neglects the conducting boom; this is justified only if t; /archives//html/Towertalk/2007-07/msg00749.html (12,013 bytes)
6. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 19:33:30 -0400; As you mentioned Peter it is the First Edition. Other papers he gave and updates in Scuttlebut included the boom discussion and his reason for selecting those particular lengths. In addition I used t; /archives//html/Towertalk/2007-07/msg00752.html (14,150 bytes)
7. Re: [TowerTalk] Yagi designs? (score: 1): Author: "David Robbins K1TTT" <k1ttt@arrl.net>; Date: Thu, 19 Jul 2007 23:41:55 -0000; Don't believe that one for a minute. All metal construction is just as susceptible to rain/snow static as any other construction. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1; /archives//html/Towertalk/2007-07/msg00753.html (8,063 bytes)
8. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 20:20:56 -0400; Maybe you dont believe it but since they are my antennas I know what works and what doesnt after over 20 years of using them. Carl KM1H _______________________________________________ _______________; /archives//html/Towertalk/2007-07/msg00761.html (8,958 bytes)
9. Re: [TowerTalk] Yagi designs? (score: 1): Author: <john@kk9a.com>; Date: Thu, 19 Jul 2007 21:38:59 -0400; I have read W2PV's yagi antenna design book many times and there is certainly a lot of useful information in it. However, I believe that his yagi designs are not optimum. He used equal spacing betwee; /archives//html/Towertalk/2007-07/msg00769.html (8,783 bytes)
10. Re: [TowerTalk] Yagi designs? (score: 1): Author: <john@kk9a.com>; Date: Thu, 19 Jul 2007 21:39:07 -0400; Usually top antennas are more prone to rain static. Were you using lower antennas during these conditions? John KK9A. <snip> In addition I used the all metal T match which was grounded to the boom. I; /archives//html/Towertalk/2007-07/msg00770.html (8,330 bytes)
11. Re: [TowerTalk] Yagi designs? (score: 1): Author: <john@kk9a.com>; Date: Thu, 19 Jul 2007 21:39:04 -0400; Actually the F/B of a 15m beam is very effected by a nearby 20m, since the 20m directors look a little like reflectors on 15m. This is can be clearly seen in a model and it has nothing to do with the; /archives//html/Towertalk/2007-07/msg00771.html (8,252 bytes)
12. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 22:28:22 -0400; He also admitted that his 6el design was not optimum. The closed spaced R and D1 was a radical departure for the norm at the time. It was several years before the concept was translated to VHF/UHF wi; /archives//html/Towertalk/2007-07/msg00773.html (10,789 bytes)
13. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 22:29:59 -0400; Cant prove it by me in real world performance. I ran hours of tests with Dean Straw, N6BV/1. Carl KM1H _______________________________________________ _______________________________________________; /archives//html/Towertalk/2007-07/msg00774.html (9,367 bytes)
14. Re: [TowerTalk] Yagi designs? (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 19 Jul 2007 22:31:11 -0400; All the above. We didnt do monoband contests except for an occassional 10M. Carl KM1H _______________________________________________ _______________________________________________ TowerTalk mailing; /archives//html/Towertalk/2007-07/msg00775.html (9,457 bytes)
15. Re: [TowerTalk] Yagi designs? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 20 Jul 2007 07:50:31 +0100; The above is all true, but it seems to be missing the point. Paraphrasing Lawson, the important point is: The assumption of symmetry in a simplified model will guarantee that the modeler will NEVER s; /archives//html/Towertalk/2007-07/msg00779.html (11,103 bytes)

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