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1. [TowerTalk] 40 m Dipole question. (score: 1): Author: Lizeth Norman <normanlizeth@gmail.com>; Date: Sun, 29 Jan 2012 10:19:25 -0500; Hi all! I'm helping a friend set up a 40 m dipole on his tower. It hangs at approximately 30ft. The dipole is in a flat top configuration. There is some droop on the ends, but not too much. We have t; /archives//html/Towertalk/2012-01/msg00503.html (7,586 bytes)
2. Re: [TowerTalk] 40 m Dipole question. (score: 1): Author: WILLIAM MARX <bmarx@bellsouth.net>; Date: Sun, 29 Jan 2012 07:42:02 -0800 (PST); What frequency? Several? Does it go up or down in either direction? I usually put the transceiver in low power and AM mode. Carrier stays on and I run the dial up and down to see which is best. AM ma; /archives//html/Towertalk/2012-01/msg00504.html (8,454 bytes)
3. Re: [TowerTalk] 40 m Dipole question. (score: 1): Author: Ken <wa8jxm@gmail.com>; Date: Sun, 29 Jan 2012 10:47:44 -0500; Sure. Check, the SWR across the band. Is it higher at 7.3, or 7.0? Is there a lower SWR in the middle? If it looks like the lowest SWR is below the band, then shorten the antenna by 6" and remeasure.; /archives//html/Towertalk/2012-01/msg00505.html (7,691 bytes)
4. Re: [TowerTalk] 40 m Dipole question. (score: 1): Author: WILLIAM MARX <bmarx@bellsouth.net>; Date: Sun, 29 Jan 2012 08:19:48 -0800 (PST); Also Norm....You didn't say and I didn't ask but how is it attached to the tower? Is the feed point very close? Are there adjacent metal guy wires that might affect it? Could the guy wires be of reso; /archives//html/Towertalk/2012-01/msg00508.html (9,726 bytes)
5. Re: [TowerTalk] 40 m Dipole question. (score: 1): Author: "AA6DX - Mark" <aa6dx@arrl.net>; Date: Sun, 29 Jan 2012 08:25:55 -0800; What I have done thru the years ... find the aerial's lowest swr .. say it dips @ 7.299. Then, using my high school algebra, I calculate the -- ahh, never mind .. here's someone that has already writ; /archives//html/Towertalk/2012-01/msg00509.html (8,924 bytes)
6. [TowerTalk] 40 m Dipole question. (score: 1): Author: "William B. Stacy" <wstacy@wildblue.net>; Date: Sun, 29 Jan 2012 14:17:05 -0600; Hi, Norm: Height above ground makes a big difference. I modeled one using EZNEC and tried it at different heights. Here is what I found: At 130 ft. resonance is at 7.225 MHz At 33 ft. resonance is at; /archives//html/Towertalk/2012-01/msg00517.html (8,059 bytes)

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