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1. Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Dale Drake <daleaa1qd@gmail.com>; Date: Thu, 27 Aug 2020 13:05:58 -0400; Here's my problem. I'm experiencing SWR problems with 160M shunt feed on my tower. Using a gamma match with HV air variable caps I am able adjust the tap point to get a very nice SWR curve using my A; /archives//html/Topband/2020-08/msg00072.html (8,770 bytes)
2. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Dave Cuthbert <telegrapher9@gmail.com>; Date: Thu, 27 Aug 2020 07:22:07 -1000; The balun heating hypothesis could be tested by disconnecting the balun. Dave, KH6AQ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector; /archives//html/Topband/2020-08/msg00073.html (9,953 bytes)
3. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Guy Olinger K2AV <k2av.guy@gmail.com>; Date: Thu, 27 Aug 2020 13:37:02 -0400; Hi Dale, The RF voltage is always looking at the far end (stuff on the end away from the tower base) to jump onto. ** Provide a deliberate, designed, long-term weather survivable metallic path to the; /archives//html/Topband/2020-08/msg00075.html (11,267 bytes)
4. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: "John Harden, D.M.D." <jhdmd@bellsouth.net>; Date: Thu, 27 Aug 2020 13:58:48 -0400; I am wondering if the air variable is flashing over. I am willing to bet that a vacuum variable would correct the problem. I use two (2) Vacuum variables in an Omega match. 73, John, W4NU Sent from m; /archives//html/Topband/2020-08/msg00076.html (13,290 bytes)
5. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Steve Lawrence via Topband <topband@contesting.com>; Date: Thu, 27 Aug 2020 11:14:45 -0700; I experienced wide spaced air variables flash over at moderate to high power in my shunt feed omega match. I changed to vac variables. That solved the problem with the additional benefit of easier tu; /archives//html/Topband/2020-08/msg00077.html (14,210 bytes)
6. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Guy Olinger K2AV <k2av.guy@gmail.com>; Date: Thu, 27 Aug 2020 15:01:37 -0400; While air variables certainly do flash over, the effect is sudden, and has no "ramping up" effect. From Dale's original post: "The problem I having is that when transmitting the SWR goes up with powe; /archives//html/Topband/2020-08/msg00078.html (16,973 bytes)
7. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: "Lloyd - N9LB" <lloydberg@tds.net>; Date: Thu, 27 Aug 2020 14:23:15 -0500; Hello Dale, I had this same problem. In my case I discovered that it was the "Doorknob" capacitors heating up and changing value. I had installed some fixed value doorknobs to "pad" the variable cap; /archives//html/Topband/2020-08/msg00079.html (10,359 bytes)
8. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Jeff Blaine <KeepWalking188@ac0c.com>; Date: Thu, 27 Aug 2020 14:28:13 -0500; Had the same issue as you Lloyd here - in a prior antenna matching net. On 160 it would start to drift after calling CQ a few times. I did not flip to vac caps. But instead ended up using lower va; /archives//html/Topband/2020-08/msg00080.html (11,078 bytes)
9. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: Guy Olinger K2AV <k2av.guy@gmail.com>; Date: Thu, 27 Aug 2020 21:29:53 -0400; I agree about the padding caps, good addition. I know of instances of both, fixed caps with insufficient current rating, and the balun insufficient for 160m blocking. If the caps were starting cold,; /archives//html/Topband/2020-08/msg00081.html (13,860 bytes)
10. Re: Topband: Shunt Fed Tower SWR Troubles (score: 1): Author: "Mike Smith VE9AA" <ve9aa@nbnet.nb.ca>; Date: Fri, 28 Aug 2020 11:03:47 -0300; Dale, What are you using as your capacitor in your gamma match? Like some of the others, this is what I would initially suspect also. (btdthtts) Mike VE9AA Mike, Coreen & Corey Keswick Ridge, NB ____; /archives//html/Topband/2020-08/msg00082.html (7,602 bytes)

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