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1. [TowerTalk] Re: resonance (score: 1): Author: W8JI@aol.com (W8JI@aol.com); Date: Mon, 6 Jul 1998 14:10:12 EDT; << In a case like the beam, where the resistive impedance may be in the 20-30 ohms range, and the required capacitive reactance for a beta match may be also in the 20 to 30 ohms range, the SWR will b; /archives//html/Towertalk/1998-07/msg00211.html (9,502 bytes)
2. [TowerTalk] Re: resonance (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 06 Jul 1998 20:10:23; Just a bit of anecdotal evidence to support Tom's latter point -- when I measure the lowest-SWR point on my C-3 at the shack end of a long 75-ohm feedline, it appears right where it's supposed to be; /archives//html/Towertalk/1998-07/msg00212.html (8,674 bytes)
3. [TowerTalk] Re: resonance (score: 1): Author: w7why@mail.coos.or.us (Tom Osborne); Date: Mon, 06 Jul 1998 20:32:09 -0700; HI Pete. That's how I tune the antennas here. I have some jumpers, and when I work 20 cw, I add the jumper and it lowers the "resonant" frequency down to 14.030. Keeps the exciter and amp happy!! 73; /archives//html/Towertalk/1998-07/msg00213.html (8,512 bytes)
4. [TowerTalk] Re: resonance (score: 1): Author: k4sb@mindspring.com (K4SB); Date: Mon, 06 Jul 1998 21:43:56 -0700; Pete Smith wrote: Just a bit of anecdotal evidence to support Tom's latter point -- when I measure the lowest-SWR point on my C-3 at the shack end of a long 75-ohm feedline, it appears right where it; /archives//html/Towertalk/1998-07/msg00215.html (8,458 bytes)
5. [TowerTalk] Re: resonance (score: 1): Author: W7TS@ibm.net (Ken Kinyon); Date: Mon, 6 Jul 1998 19:06:02 -0600; I am curious why you are feeding your C3 with 75 ohm feedline. Ken -- Kenneth E. Kinyon 34 Princeton Circle Longmont, CO 80503-2106 Voice/fax (303) 684-0037 E-mail W7TS@ibm.net --Original Message-- F; /archives//html/Towertalk/1998-07/msg00217.html (8,816 bytes)
6. [TowerTalk] Re: resonance (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 07 Jul 1998 02:18:33; Sorry Ed, it doesn't fly. I think this is a classic case of a feedline not matched to the antenna. There's no RF on the shield. 73, Pete Smith N4ZR n4zr@contesting.com "That's WEST Virginia. Thanks a; /archives//html/Towertalk/1998-07/msg00223.html (8,988 bytes)
7. [TowerTalk] Re: resonance (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Tue, 07 Jul 1998 02:23:25; Because I could get 75 ohm CATV hardline cheap. I trimmed the length to be a multiple of 1/2 wave at 3500 kHz, using an Autek RF-1 to cut it precisely. There is RG-213 on both ends (up the tower and; /archives//html/Towertalk/1998-07/msg00225.html (8,367 bytes)
8. [TowerTalk] Re: resonance (score: 1): Author: W8JI@aol.com (W8JI@aol.com); Date: Tue, 7 Jul 1998 13:23:14 EDT; << > Pete; A low point SWR does not indicate the resonance frequency of an antenna. From what you describe, I'd bet on RF on the outside of the feedline. I'd bet Pete has a 50 ohm bridge measuring a; /archives//html/Towertalk/1998-07/msg00235.html (8,597 bytes)
9. [TowerTalk] Re: resonance (score: 1): Author: n7cl@mmsi.com (Eric Gustafson Courtesy Account); Date: Tue, 7 Jul 1998 11:26:07 -0700; To: <towertalk@contesting.com> Hi Tom, While its true that the instrument is probably not sensitive to common mode current, a lot depends on lead dress in a situation like this. Even if the line is; /archives//html/Towertalk/1998-07/msg00238.html (9,467 bytes)
10. [TowerTalk] Re: resonance (score: 1): Author: W8JI@aol.com (W8JI@aol.com); Date: Tue, 7 Jul 1998 18:05:24 EDT; Hi Eric, << While its true that the instrument is probably not sensitive to common mode current, a lot depends on lead dress in a situation like this. Even if the line is quite long, if it is not dec; /archives//html/Towertalk/1998-07/msg00240.html (10,653 bytes)
11. [TowerTalk] Re: resonance (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 08 Jul 1998 11:27:07; Since my earlier comment has occasioned a wider debate, here's a copy of my answer to W8JI To: <towertalk@contesting.com> case, section to be an even half-wave multiple at 3500 kHz) .... 200 ft +- of; /archives//html/Towertalk/1998-07/msg00247.html (10,394 bytes)

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