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1. [TowerTalk] tower resonances (score: 1): Author: "Rudy Severns" <n6lf@arrl.net>; Date: Tue, 10 Feb 2009 14:17:57 -0800; I must apologize to the reflector for asking my original question in such a broad way when my interest is actually much narrower. Obviously there is a vast literature on tower detuning, especially re; /archives//html/Towertalk/2009-02/msg00264.html (8,290 bytes)
2. Re: [TowerTalk] tower resonances (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 10 Feb 2009 16:50:56 -0800 (PST); To me the question of whether or not you need to detune anything comes down to pattern distortion. Simply put up a vertical near the object in question, connect it to a signal generator, and walk aro; /archives//html/Towertalk/2009-02/msg00272.html (7,630 bytes)
3. Re: [TowerTalk] tower resonances (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 10 Feb 2009 20:52:26 -0800; <snip> Let's turn the question around.. why would you want to know whether the tower is resonant (unless you're actually using it as a radiator). There's the idea that it might corrupt the pattern of; /archives//html/Towertalk/2009-02/msg00275.html (7,764 bytes)
4. [TowerTalk] tower resonances (score: 1): Author: "Rudy Severns" <n6lf@arrl.net>; Date: Tue, 10 Feb 2009 21:06:02 -0800; Pattern distortion is one consideration Rick, but if you're talking about an array things get a lot worse. In an array, besides the obvious distortion possible from adding another element (a parasiti; /archives//html/Towertalk/2009-02/msg00276.html (8,658 bytes)
5. Re: [TowerTalk] tower resonances (score: 1): Author: "N7mal" <n7mal@citlink.net>; Date: Tue, 10 Feb 2009 21:09:09 -0800; I can think of a reason to know if a tower is resonant because in the last 50 years it has happened to me several times. Suppose you have a 70ft tower and an 80m full sized vertical. Where, or how fa; /archives//html/Towertalk/2009-02/msg00277.html (9,763 bytes)
6. Re: [TowerTalk] tower resonances (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 10 Feb 2009 21:54:25 -0800; Now you're in my favorite area.. Lots of modeling, lots of measuring, and still you won't be able to a priori predict what's going to happen unless you're set up for a sort of idealized situation (e.; /archives//html/Towertalk/2009-02/msg00279.html (10,958 bytes)
7. Re: [TowerTalk] tower resonances (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 11 Feb 2009 07:48:49 +0000; Please can you expand on that method, Rudy? More and more TowerTalk readers *do* have the equipment. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek _____________________________________________; /archives//html/Towertalk/2009-02/msg00281.html (7,657 bytes)
8. Re: [TowerTalk] tower resonances (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Wed, 11 Feb 2009 09:37:23 +0100; Yes please, I´m interested too. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting; /archives//html/Towertalk/2009-02/msg00282.html (7,451 bytes)
9. Re: [TowerTalk] tower resonances (score: 1): Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>; Date: Wed, 11 Feb 2009 06:26:46 -0500; So if the choice is one of buying either a VNA or an airplane capable of dragging a "sense" antenna around, you make the decision a lot easier for me, Jim....:-) Bud, W2RU ___________________________; /archives//html/Towertalk/2009-02/msg00283.html (8,317 bytes)
10. [TowerTalk] tower resonances (score: 1): Author: "Rudy Severns" <n6lf@arrl.net>; Date: Wed, 11 Feb 2009 09:47:16 -0800; Wow, I didn't realize this was such a hot topic! My interest is driven by a recent practical problem. I was helping a friend with a new 80m 4-square. He had done a wonderful job mechanically. The arr; /archives//html/Towertalk/2009-02/msg00286.html (9,246 bytes)
11. Re: [TowerTalk] tower resonances (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 11 Feb 2009 10:20:55 -0800; Rudy, I'm convinced that this is a VERY common problem with ground-mounted verticals, but that few hams are aware that it is. My main TX antenna on 160M is a T vertical. I've also used a vertical on; /archives//html/Towertalk/2009-02/msg00287.html (8,870 bytes)
12. Re: [TowerTalk] tower resonances (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Wed, 11 Feb 2009 15:02:41 -0500; Sorta hashed this out on the Low Band Chat a bit and I think briefly going inside each ring rotor with a standoff arm above and below for the detuning sheath wires should work OK. Not sure if it act; /archives//html/Towertalk/2009-02/msg00288.html (8,504 bytes)
13. Re: [TowerTalk] tower resonances (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 11 Feb 2009 22:28:54 -0800; Brings that whole "near field/far field" thing into importance, eh? When you say "not too distant" do you mean 100 meters away? 20 meters? 1km? The whole project came to a screeching Hmm.. maybe an e; /archives//html/Towertalk/2009-02/msg00291.html (9,908 bytes)
14. Re: [TowerTalk] tower resonances (score: 1): Author: Tom McDermott <tom.mcdermott4@yahoo.com>; Date: Thu, 12 Feb 2009 09:13:37 -0800 (PST); Forrest Gehrke K2BT wrote a 6-part series in Ham Radio in 1983 / 1984 on phased vertical antennas. He came up with a technique to derive the Z-parameter matrix (self and mutual impedances 2-po; /archives//html/Towertalk/2009-02/msg00292.html (10,479 bytes)
15. [TowerTalk] tower resonances (score: 1): Author: "Rudy Severns" <n6lf@arrl.net>; Date: Thu, 12 Feb 2009 17:12:56 -0800; Ok guys I've thrown some red meat onto my web site. If you want to see the notes on how I'm measuring tower resonances go to: www.antennasbyn6lf.com . 73, Rudy N6LF __________________________________; /archives//html/Towertalk/2009-02/msg00293.html (7,923 bytes)
16. [TowerTalk] tower resonances (score: 1): Author: "D.W. Fearn" <dwfearn@dwfearn.com>; Date: Thu, 12 Feb 2009 21:44:50 -0500; I do not have any experience with detuning amateur antennas, but I have done it for several AM broadcast stations. The way we determined if the tower was re-radiating (and affecting the pattern of th; /archives//html/Towertalk/2009-02/msg00294.html (7,745 bytes)
17. Re: [TowerTalk] tower resonances (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 13 Feb 2009 07:08:46 -0800; <snip> That method's in the antenna book or ON4UN as well. It's a variant of the technique for measuring the Y matrix of an arbitrary network, or, for that matter, measuring the parameters of a power; /archives//html/Towertalk/2009-02/msg00296.html (11,982 bytes)
18. Re: [TowerTalk] tower resonances (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Fri, 13 Feb 2009 08:06:55 -0700; The true z-matrix will always be symmetric if the network is reciprocal. All passive networks (not containing ferrite circulators) are reciprocal. Therefore, matrix symmetry will not tell you anythin; /archives//html/Towertalk/2009-02/msg00297.html (9,219 bytes)
19. [TowerTalk] tower resonances (score: 1): Author: John King <k5pgw@yahoo.com>; Date: Fri, 13 Feb 2009 08:41:50 -0800 (PST); I have been reading, at first, then deleting subsequent posts, regarding tower resonances. I have a 130 foot plus grounded tower with guys broken up by insulators, with NO antennas on top. I WAS goin; /archives//html/Towertalk/2009-02/msg00299.html (8,773 bytes)
20. Re: [TowerTalk] tower resonances (score: 1): Author: "Bill Aycock" <baycock@hughes.net>; Date: Fri, 13 Feb 2009 11:30:43 -0600; JohnI was first licensed (as an Amateur) in 1952, but have not been active for the whole time. However, I am familiar with experimental procedures in another field. These discussions fascinate me, an; /archives//html/Towertalk/2009-02/msg00303.html (10,670 bytes)

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