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1. [RFI] Eliminating TVI (score: 1): Author: "N6KJ" <kelly@thejohnsons.ws>; Date: Tue, 23 Dec 2003 09:45:11 -0800 (PST); While I have some spare time during the Christmas Holiday season I am going to try once again to eliminate my TVI problem. I have tried everything and nothing fixes it. I still think it is probably d; /archives//html/RFI/2003-12/msg00073.html (9,253 bytes)
2. Re: [RFI] Eliminating TVI (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Tue, 23 Dec 2003 12:03:39 -0600; Sounds like a really severe case! I suspect either power line or antenna line coupling, and I suspect the filters you are using are ineffective below 20 meters. The 43 material is primarily a VHF mat; /archives//html/RFI/2003-12/msg00074.html (8,093 bytes)
3. RE: [RFI] Eliminating TVI (score: 1): Author: "Dan Violette" <danki6x@earthlink.net>; Date: Tue, 23 Dec 2003 10:15:53 -0800; N6KJ, Start disconnecting things and seeing if you can get the problem to go away. This will show you if it is still coming in a line that may not even being used. Example, the satellite antenna line; /archives//html/RFI/2003-12/msg00075.html (10,739 bytes)
4. Re: [RFI] Eliminating TVI (score: 1): Author: "N6KJ" <kelly@thejohnsons.ws>; Date: Tue, 23 Dec 2003 10:25:55 -0800 (PST); Yes, I've been trying to fix this for most of this past year (off-and-on). As I said, the problem is in the color. I don't see any herringbones or any other visual distortion. I also hear no interfer; /archives//html/RFI/2003-12/msg00080.html (9,604 bytes)
5. Re: [RFI] Eliminating TVI (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 23 Dec 2003 23:39:46 +0000; N6KJ wrote: I'm not a TV expert so I don't know the answer. What I can say is that if 10 watts of RF on 80/40 meters with a dipole 30 feet away is swamping the input then somebody did a pretty crappy; /archives//html/RFI/2003-12/msg00082.html (8,701 bytes)
6. Re: [RFI] Eliminating TVI (score: 1): Author: Jason Buchanan <jsb@digistar.com>; Date: Tue, 23 Dec 2003 19:06:44 -0500; present with Based on your email it doesn't sound like you have much chance to fix this problem. but........ try the suggestions below: If the TV has a setup screen that you can display with NOTHING; /archives//html/RFI/2003-12/msg00083.html (8,949 bytes)
7. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 23 Dec 2003 20:49:24 -0500; If it were my TV, I'd disconnect all the interconnecting cables except the power cord. I would add a good differential and common mode filter on the power cord. I'd watch the snow on an unused channe; /archives//html/RFI/2003-12/msg00084.html (7,696 bytes)
8. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 23 Dec 2003 20:58:19 -0500; By the way, I read more careful and see it is a color complaint and you have an external tuner and signal processing system of some type. In that case I'd start with the most simple system possible w; /archives//html/RFI/2003-12/msg00085.html (8,301 bytes)
9. Re: [RFI] Eliminating TVI (score: 1): Author: "N6KJ" <kelly@thejohnsons.ws>; Date: Fri, 26 Dec 2003 13:36:12 -0800 (PST); Thanks for the advice, but that test proved to be inconclusive. The problem is that the primary symptom of the interference is that a color signal becomes somewhat black-and-white. I can see little h; /archives//html/RFI/2003-12/msg00097.html (9,023 bytes)
10. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 26 Dec 2003 17:10:32 -0500; I suggested in a second post looking for a small battery powered test generator. I would think there is something manufactured to test the input ports that you could buy or borrow. Other than that, w; /archives//html/RFI/2003-12/msg00098.html (8,456 bytes)
11. Re: [RFI] Eliminating TVI (score: 1): Author: "Cortland Richmond" <ka5s@earthlink.net>; Date: Fri, 26 Dec 2003 14:50:35 -0800; Looks to me like interference at the color burst detector. The absence of a valid signal from this circuit is supposed to turn off color and although no stations now broadcast in black and white that; /archives//html/RFI/2003-12/msg00099.html (9,334 bytes)
12. Re: [RFI] Eliminating TVI (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Fri, 26 Dec 2003 17:37:51 -0600; Yes. Not necessarily -- this burst detector would also be looking at a composite video signal (i.e., plain ordinary video on coax). Agreed on all of the above, except that my weapon of choice would b; /archives//html/RFI/2003-12/msg00100.html (10,605 bytes)
13. Re: [RFI] Eliminating TVI (score: 1): Author: "N6KJ" <kelly@thejohnsons.ws>; Date: Fri, 26 Dec 2003 21:28:58 -0800 (PST); As I mentioned in an earlier e-mail, I already verified that I get interference when I disconnect the satellite set-top and VCR and ONLY play a DVD. I figured this was as good (or better) than a rabb; /archives//html/RFI/2003-12/msg00101.html (9,332 bytes)
14. Re: [RFI] Eliminating TVI (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 27 Dec 2003 07:45:07 -0500; At 09:28 PM 12/26/03 -0800, N6KJ wrote: As I mentioned in an earlier e-mail, I already verified that I get interference when I disconnect the satellite set-top and VCR and ONLY play a DVD. I don't kn; /archives//html/RFI/2003-12/msg00102.html (8,506 bytes)
15. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 27 Dec 2003 07:54:48 -0500; I assume you also have a GOOD common mode and differential mode filter on the power line, and the line cords of each are plugged into the same filter. Also that nothing else is around the equipment,; /archives//html/RFI/2003-12/msg00103.html (9,113 bytes)
16. Re: [RFI] Eliminating TVI (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 27 Dec 2003 08:14:29 -0500; At 07:54 AM 12/27/03 -0500, Tom Rauch wrote: I'd just be darned sure the line filter is a good one for common and differential mode currents. Do you have a recommendation for a GOOD commercial filter; /archives//html/RFI/2003-12/msg00104.html (8,295 bytes)
17. Re: [RFI] Eliminating TVI (score: 1): Author: "N6KJ" <kelly@thejohnsons.ws>; Date: Sat, 27 Dec 2003 09:17:57 -0800 (PST); I will work on the power line filtering. Thanks for the advice. There is light at the end of the tunnel! Today, I did some experiments. I was able to reduce the interference by adding another toroid; /archives//html/RFI/2003-12/msg00105.html (9,823 bytes)
18. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 27 Dec 2003 12:21:08 -0500; No. I generally build my own because the commercial filters I find either have output and input bypass capacitors to common grounds making them poor or useless for common mode rejection or they have; /archives//html/RFI/2003-12/msg00106.html (12,133 bytes)
19. Re: [RFI] Eliminating TVI (score: 1): Author: "Cortland Richmond" <ka5s@earthlink.net>; Date: Sat, 27 Dec 2003 09:51:22 -0800; This is where it's hard to get assured choking. A filter for wires without an RF ground -- and AC power is _that_, all right -- needs a common mode impedance much higher than the common mode impedanc; /archives//html/RFI/2003-12/msg00107.html (8,803 bytes)
20. Re: [RFI] Eliminating TVI (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 27 Dec 2003 15:54:59 -0500; At 12:21 PM 12/27/03 -0500, Tom Rauch wrote: I generally build my own because the commercial filters I find either have output and input bypass capacitors to common grounds [A] making them poor or us; /archives//html/RFI/2003-12/msg00108.html (9,704 bytes)

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