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1. [RFI] high noise level... (score: 1): Author: "Paul Walsh" <woly@wimpley.freeserve.co.uk>; Date: Thu, 11 Sep 2003 12:16:54 +0100; Thanks to everyone that has replyed to my first posting with help, I am not currently using a balun on the quad, so i will make one today and see if this makes any difference. The noise seems to be a; /archives//html/RFI/2003-09/msg00007.html (7,363 bytes)
2. Re: [RFI] high noise level... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 11 Sep 2003 07:50:19 -0400; Paul, I ALWAYS use a balun with any balanced directional antenna, because even small amounts of common mode can cause loss of directivity by filling in nulls. It just is a very good habit to get into; /archives//html/RFI/2003-09/msg00008.html (7,864 bytes)
3. Re: [RFI] high noise level... (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 11 Sep 2003 14:50:56 +0100; Tom Rauch wrote: Paul, I ALWAYS use a balun with any balanced directional antenna, because even small amounts of common mode can cause loss of directivity by filling in nulls. It just is a very good; /archives//html/RFI/2003-09/msg00010.html (10,723 bytes)
4. Re: [RFI] high noise level... (score: 1): Author: Jim Smith <jimsmith@shaw.ca>; Date: Thu, 11 Sep 2003 11:45:38 -0700; In all the stuff I've read about current chokes, feedline radiation due to asymmetry, etc. I don't think I've ever seen this possibility pointed out (or thought of it). If coax can pick up RF and rer; /archives//html/RFI/2003-09/msg00013.html (7,742 bytes)
5. Re: [RFI] high noise level... (score: 1): Author: <dgsvetan@rockwellcollins.com>; Date: Thu, 11 Sep 2003 15:35:28 -0500; Jim and List Members, A sidenote to Jim's comment: at least one vendor makes a SHIELDED rotator cable. Yes, the usual 8 conductors, with 2 of them over-sized, all enclosed with a shield braid and UV-; /archives//html/RFI/2003-09/msg00014.html (11,886 bytes)
6. Re: [RFI] high noise level... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 11 Sep 2003 20:15:06 -0400; There is a reason you don't hear of that problem much, although I agree it is possible. The coax connects DIRECTLY to the antenna element. The Rotor and tower are only close by, and obviously are co; /archives//html/RFI/2003-09/msg00015.html (8,531 bytes)
7. Re: [RFI] high noise level... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 11 Sep 2003 20:32:44 -0400; The problem with a shield is it simply re-radiates whatever common mode currents are in the system. Add another shield on top, and it does the same. They are especially useless if one end is left fl; /archives//html/RFI/2003-09/msg00016.html (8,561 bytes)
8. Re: [RFI] high noise level... (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 11 Sep 2003 22:28:48 +0100; Jim Smith wrote: Ian White, G3SEK wrote: Another possibility is that it might be coming up the rotator cable, and crossing over to the antenna at the top of the tower. Remember, there is actually no; /archives//html/RFI/2003-09/msg00017.html (9,700 bytes)
9. Re: [RFI] high noise level... (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 12 Sep 2003 08:07:08 +0100; Tom Rauch wrote: In all the stuff I've read about current chokes, feedline radiation due to asymmetry, etc. I don't think I've ever seen this possibility pointed out (or thought of it). If coax can p; /archives//html/RFI/2003-09/msg00018.html (9,718 bytes)
10. [RFI] high noise level... (score: 1): Author: "Paul Walsh" <woly@wimpley.freeserve.co.uk>; Date: Fri, 12 Sep 2003 15:42:47 +0100; Thanks again to everyone for the great response to my plea for help, Today i made a very simple choke balun, used the biggest ferrite ring i had, and could just about squeze 3 turns of coax through.; /archives//html/RFI/2003-09/msg00019.html (8,575 bytes)
11. Re: [RFI] high noise level... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 12 Sep 2003 10:48:33 -0400; Hi Ian, I agree a gamma match isn't good. I've actually had feedlines arc to the tower legs when using a Gamma match on a Wilson 20m Yagi. But in that case, the problem is the boom and the entire tow; /archives//html/RFI/2003-09/msg00020.html (9,831 bytes)

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