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Total 15 documents matching your query.

1. [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 23 Jan 2006 21:05:41 -0500; I'm having trouble with my shunt-fed 15m tower. I have an L matching network that is switched between 80 and 160m. A relay selects different taps on the inductor, and also adds capacitance for 160m.; /archives//html/Towertalk/2006-01/msg00440.html (7,600 bytes)
2. Re: [TowerTalk] SWR shifts with power (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Mon, 23 Jan 2006 18:52:55 -0800; All the sections bonded together real good? 73 Tom W7WHY _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.co; /archives//html/Towertalk/2006-01/msg00443.html (7,963 bytes)
3. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Larry Phipps <larry@telepostinc.com>; Date: Mon, 23 Jan 2006 22:01:39 -0500; I would suspect an intermittent connection... either a coax connector or maybe a joint between tower sections. You should bridge the sections with straps. Also the rotator bearings should be bridged; /archives//html/Towertalk/2006-01/msg00444.html (9,135 bytes)
4. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 23 Jan 2006 22:24:17 -0500; Yes! All sections are bonded together with No-Al-Ox. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 _________________; /archives//html/Towertalk/2006-01/msg00446.html (7,781 bytes)
5. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 23 Jan 2006 22:27:33 -0500; I swapped out the coax with another line - same problem. I doubt the tower section joints are a problem, although the rotator might be interesting. I was thinking more like it might be a problem in t; /archives//html/Towertalk/2006-01/msg00447.html (8,244 bytes)
6. Re: [TowerTalk] SWR shifts with power (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 23 Jan 2006 22:35:40 -0500; Any ceramic capacitors in the circuit? 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com ht; /archives//html/Towertalk/2006-01/msg00448.html (9,121 bytes)
7. Re: [TowerTalk] SWR shifts with power (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Mon, 23 Jan 2006 20:43:14 -0800; Hi Bill Another thing I have seen is bad connections in a variable cap. You might check the bearings and where the end plates are connected together. I've seen them full of powder when taken apart. 7; /archives//html/Towertalk/2006-01/msg00452.html (8,386 bytes)
8. Re: [TowerTalk] SWR shifts with power (score: 1): Author: "Tom McDermott" <tom.mcdermott4@verizon.net>; Date: Mon, 23 Jan 2006 23:00:24 -0600; Hi Bill, You mention an L-network, but do you additionally have a capacitor in series with the shunt-feeding arm? Or is your L-network just one series-L from the coaxial feed point to the arm, and on; /archives//html/Towertalk/2006-01/msg00453.html (8,908 bytes)
9. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 24 Jan 2006 10:24:09 +0100 (CET); I gather that there's a beam providing top loading? if so, you can have fun things happening in the rotator. I had a 205BA providing top loading and a T2X rotator. The RF current through the capacity; /archives//html/Towertalk/2006-01/msg00456.html (10,032 bytes)
10. [TowerTalk] swr shifts with power (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 24 Jan 2006 08:29:26 -0500; Borrow an antenna tuner, and use it to bypass your network, to see if you still see the shift. That will at least point you in the right direction. n2ea@arrl.net jimjarvis@ieee.org __________________; /archives//html/Towertalk/2006-01/msg00458.html (7,863 bytes)
11. Re: [TowerTalk] SWR shifts with power (score: 1): Author: TexasRF@aol.com; Date: Tue, 24 Jan 2006 10:26:43 EST; Further to Peter's comments if there is a beam on top: The driven element of the beam can add considerable top loading to the shunt fed tower. The balun that connects the driven element to the system; /archives//html/Towertalk/2006-01/msg00466.html (11,083 bytes)
12. [TowerTalk] SWR shifts with power (score: 1): Author: "Howard Klein" <howk2@hotmail.com>; Date: Tue, 24 Jan 2006 21:05:05 +0000; Bill, I had a similar problem with the same symptoms. In my case it seems my shunt wire, actually 3/8" cu tubing, got blown close enough to the tower for it to arc with high power. Hope your solution; /archives//html/Towertalk/2006-01/msg00483.html (7,674 bytes)
13. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 24 Jan 2006 20:13:14 -0500; Had a problem like that with the 80m cap. A shot of LPS 3 and a few rotations seems to have cured that. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man; /archives//html/Towertalk/2006-01/msg00492.html (8,977 bytes)
14. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 24 Jan 2006 20:11:16 -0500; Yes and no. Originally, yes, but I've gone and switched out to an air variable as an experiment, and the problem remains. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousa; /archives//html/Towertalk/2006-01/msg00493.html (8,461 bytes)
15. Re: [TowerTalk] SWR shifts with power (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 24 Jan 2006 21:20:23 -0500; No. Yup. OK. I've considered this possibility, even to the point of possibly winding a new coil just for 80m. I'm seeing about 200 pf on 80m on the shunt, and around 600 pf on 160m. What value series; /archives//html/Towertalk/2006-01/msg00496.html (10,354 bytes)

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