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21. Re: [RFI] Unknown Signal (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 7 Dec 2003 12:45:38 -0500; I'm hearing it here S9 just north of east of me. It is two distinct carriers with small separation, exactly as described. Of course if I move the Bell South 2GHz cordless telephone to our bedroom fro; /archives//html/RFI/2003-12/msg00009.html (8,022 bytes)
22. Re: [RFI] Unknown Signal (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 7 Dec 2003 13:56:52 -0500; Jim and all, I'm 7 miles from the nearest two population centers of about 7000 people on a remote dirt road in a large county of only 18,000 people. When I shut off power to my house and look at my; /archives//html/RFI/2003-12/msg00012.html (10,288 bytes)
23. Re: [RFI] Unknown Signal (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 7 Dec 2003 20:37:25 -0500; I popped my wife's telephone apart, and it has a simple 28.63 crystal. Obviously they are everywhere. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.; /archives//html/RFI/2003-12/msg00015.html (8,809 bytes)
24. Re: [RFI] Unknown Signal (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 8 Dec 2003 17:13:23 -0500; Are there any articles that describe how to identify and DF signals? _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/r; /archives//html/RFI/2003-12/msg00022.html (7,733 bytes)
25. Re: [RFI] Re: [TowerTalk] electric fence qrn (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 8 Dec 2003 23:25:53 -0500; My neighbor has a quiet pulser. I have antennas 300 ft from his fence and can't hear a tick unless something in the fence gets loose. He had a nasty one that was dirty no matter what we did. I only k; /archives//html/RFI/2003-12/msg00024.html (7,237 bytes)
26. Re: [RFI] shielding question (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 22 Dec 2003 18:40:29 -0500; I think K1TTT just needs to ground all the shields at the active electronics component and make the common ground point for the equipment the power line safety ground at the outlet strip where power; /archives//html/RFI/2003-12/msg00052.html (10,382 bytes)
27. Re: [RFI] shielding question (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 22 Dec 2003 18:43:20 -0500; I wouldn't worry about it a single bit. I had to test and approve cables for BC work and I never found a problem because of a drain wire. 73 Tom _______________________________________________ RFI m; /archives//html/RFI/2003-12/msg00053.html (7,634 bytes)
28. Re: [RFI] shielding question (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 22 Dec 2003 19:51:41 -0500; Hi Jim, I'm fascinated by the RF part of this, since the RF part runs contrary to what I have measured. No question the drain COULD carry considerable common mode current at low frequencies, but it s; /archives//html/RFI/2003-12/msg00057.html (9,422 bytes)
29. Re: [RFI] shielding question (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 23 Dec 2003 05:39:45 -0500; Jim and Jim, I was interested in why or how adding a drain inside a shield would suddenly render the shield "useless". I'd like to know what electrical effect is severe enough to cause common mode i; /archives//html/RFI/2003-12/msg00061.html (8,752 bytes)
30. Re: [RFI] Paying for information (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 23 Dec 2003 14:20:33 -0500; Hi Jim, I'm not trying to be argumentative about this but.... Here is where you can help. Correct me if I'm wrong. 30 dB is a ratio between the two cables you tested, but if one cable is -140dB based; /archives//html/RFI/2003-12/msg00077.html (9,350 bytes)
31. 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)
32. 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)
33. [RFI] Proposed Cable test (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 24 Dec 2003 11:56:20 -0500; Well, curiosity got the better of me. Here's how I propose a test for shielding effectiveness. This is similar to other tests I have done in the past. I'm thinking of using 2-feet of cable in the tes; /archives//html/RFI/2003-12/msg00088.html (9,374 bytes)
34. Re: [RFI] Proposed Cable test (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 24 Dec 2003 11:59:07 -0500; I'll keep my shirt on, and use a short. Sorry about that. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2003-12/msg00089.html (6,887 bytes)
35. Re: [RFI] shielding answer (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 24 Dec 2003 16:23:28 -0500; I'm trying to follow this, but I have a problem. When a time-varying electric field is taken to zero, so it the magnetic field. When a time-varying magnetic field is taken to zero, so is the electri; /archives//html/RFI/2003-12/msg00095.html (10,068 bytes)
36. 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)
37. 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)
38. 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)
39. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 28 Dec 2003 11:22:18 -0500; We have to watch the safety ground. If it passes through the filters without being filtered the combination can be nearly the same as no filtering at all. The series common mode impedance offered by; /archives//html/RFI/2003-12/msg00111.html (11,290 bytes)
40. Re: [RFI] Eliminating TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 29 Dec 2003 08:34:10 -0500; There is another problem also, and that is how the shield actually works. Unless the shield has ZERO voltage differential between each grounded end with BOTH ends grounded and the wires inside are t; /archives//html/RFI/2003-12/msg00114.html (9,704 bytes)

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