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1. [TowerTalk] trap antenna performance (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 13 Apr 2015 07:19:55 -0700; this is an interesting question... I wonder if it's a "sensitivity to small changes in component values" issue? Designing a trap antenna so that when its brand new it has the right performance should; /archives//html/Towertalk/2015-04/msg00257.html (8,900 bytes)
2. Re: [TowerTalk] trap antenna performance (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 13 Apr 2015 10:39:11 -0400; detailed level. So maybe if the L or the C of the trap changes significantly, then the trap resonance changes, which then changes the apparent series L or C in the element. Trap Q is more difficult; /archives//html/Towertalk/2015-04/msg00262.html (8,872 bytes)
3. Re: [TowerTalk] trap antenna performance (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Mon, 13 Apr 2015 07:54:31 -0700; On 4/13/15 7:39 AM, Paul Christensen wrote: "But traps are kind of difficult to model (at least in NEC) at a very detailed level. So maybe if the L or the C of the trap changes significantly, then th; /archives//html/Towertalk/2015-04/msg00271.html (10,588 bytes)
4. Re: [TowerTalk] trap antenna performance (score: 1): Author: "Jeff AC0C" <keepwalking188@ac0c.com>; Date: Mon, 13 Apr 2015 11:20:07 -0500; Last year I spent quite a bit of time with the VNA/SA and trusty 259 trying to determine the precise resonant point of a Hy-gain trap. In the end it was a failure - I could not pull the environment o; /archives//html/Towertalk/2015-04/msg00277.html (12,687 bytes)
5. Re: [TowerTalk] trap antenna performance (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 13 Apr 2015 12:31:14 -0400; Recently, an article on p.43 in the February, 2015 issue of QST discusses trap performance and test fixture criteria. The article is titled: "Test Setup for Measuring Traps." The author used a miniVN; /archives//html/Towertalk/2015-04/msg00278.html (9,941 bytes)
6. Re: [TowerTalk] trap antenna performance (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 13 Apr 2015 09:38:27 -0700; All of this makes sense to me. Also, a trapped is a shortened antenna, so radiation resistance can be lower relative to loss components. And the difference need not all be dissipation. Any antenna wi; /archives//html/Towertalk/2015-04/msg00279.html (9,963 bytes)
7. Re: [TowerTalk] trap antenna performance (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 13 Apr 2015 15:02:25 -0400; And the difference need not all be dissipation. Any antenna with "gain" concentrates its radiation in the desired direction(s) by "stealing" it from other directions. Not necessarily. At 1500 W from; /archives//html/Towertalk/2015-04/msg00295.html (8,876 bytes)
8. Re: [TowerTalk] trap antenna performance (score: 1): Author: "Jeff AC0C" <keepwalking188@ac0c.com>; Date: Mon, 13 Apr 2015 16:48:23 -0500; I dug that article out of my stack of to-read stuff. And just like you say, there is a very nice looking article in there with a very slick test setup. I'm sure it gives repeatable results. Meaning i; /archives//html/Towertalk/2015-04/msg00302.html (12,439 bytes)

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