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1. Re: [TowerTalk] 120' 160m vertical (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Wed, 18 Feb 2009 17:27:21 -0600; Thanks for all the help on the series rf caps. I am thinking of putting up a 120 foot Rohn 45 tower which is insulated at the bottom, so that it becomes a 1/4 wave vertical. I would like to feed this; /archives//html/Towertalk/2009-02/msg00488.html (10,354 bytes)
2. Re: [TowerTalk] 120' 160m vertical (score: 1): Author: K4SAV <RadioIR@charter.net>; Date: Wed, 18 Feb 2009 18:53:22 -0600; I would expect that 120 of Rohn 45 with a three element 40 meter Yagi on top to be resonant somewhere around 1.6 MHz. Since it is so tall, if you match it with a series cap, the feedpoint impedance w; /archives//html/Towertalk/2009-02/msg00489.html (11,270 bytes)
3. Re: [TowerTalk] 120' 160m vertical (score: 1): Author: K4SAV <RadioIR@charter.net>; Date: Wed, 18 Feb 2009 19:00:22 -0600; I just threw together a quick model, and it looks like my estimate was too high on the feedpoint impedance. It should be close enough to 50 ohms that a single cap should do it. Resonant frequency was; /archives//html/Towertalk/2009-02/msg00490.html (12,421 bytes)
4. Re: [TowerTalk] 120' 160m vertical (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Wed, 18 Feb 2009 19:04:52 -0600; Thanks Jerry, I need to improve my modeling skills. Thanks for checking it out. Mark N1UK _______________________________________________ _______________________________________________ TowerTalk mai; /archives//html/Towertalk/2009-02/msg00491.html (13,573 bytes)

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