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Total 5 documents matching your query.

1. [TowerTalk] How much reactance change on a dipole, from 3500-3900 khz ? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 5 Jul 2010 06:05:42 -0700; My software is not working to do this calculation at the moment. What I'd like to know is how much reactance change there is, when going from say 3500 khz UP to 3900 khz. IE: 68' LL rotary dipole res; /archives//html/Towertalk/2010-07/msg00068.html (8,215 bytes)
2. Re: [TowerTalk] How much reactance change on a dipole, from 3500-3900 khz ? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 05 Jul 2010 08:04:17 -0700; I switch in about 250 pF to QSY from 3550 to 3850 kHz on my inverted vee. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mailing l; /archives//html/Towertalk/2010-07/msg00069.html (10,522 bytes)
3. Re: [TowerTalk] How much reactance change on a dipole, from 3500-3900 khz ? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Mon, 05 Jul 2010 16:19:50 +0100; I don't think you told us the element diameter. From EZNEC I see about 272ohms /500kHz for #20 wire, and 186ohms/500kHz with 1" diameter. Steve G3TXQ _______________________________________________ _; /archives//html/Towertalk/2010-07/msg00070.html (8,116 bytes)
4. Re: [TowerTalk] How much reactance change on a dipole, from 3500-3900 khz ? (score: 1): Author: TexasRF@aol.com; Date: Mon, 5 Jul 2010 11:32:22 EDT; Jim, there was an old DOS program in the ARRL Antenna Book software for modeling mobile antennas. A google search will probably turn it up from other sources. This program expects coil loading but th; /archives//html/Towertalk/2010-07/msg00071.html (10,933 bytes)
5. Re: [TowerTalk] How much reactance change on a dipole, from 3500-3900 khz ? (score: 1): Author: TexasRF@aol.com; Date: Mon, 5 Jul 2010 11:46:57 EDT; Jim, a further thought on the motor driven tuner: As you know, the loss in the variable C will be negligible. The loss in a loading coil is related to the Xl and Q. The more Xl, the greater the loss.; /archives//html/Towertalk/2010-07/msg00072.html (10,421 bytes)

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