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1. [RFI] CAT 3 Cable? (score: 1): Author: Eric Rosenberg <wd3q@starpower.net>; Date: Thu, 17 Jun 2004 17:18:36 -0400; In trying to calm down the telephone RFI problem in my old house, the K-COM folks suggested I replace the old, solid, 4-conductor wire with CAT 3 cable. I'd never heard of CAT3, only CAT 5, and am wo; /archives//html/RFI/2004-06/msg00047.html (7,010 bytes)
2. Re: [RFI] CAT 3 Cable? (score: 1): Author: "William Liporace - NA2NA" <na2na@earthlink.net>; Date: Thu, 17 Jun 2004 17:36:15 -0400; CAT3 is an older version CAT5. Used very commonly in phone/network systems. You can run CAT5 as well. Is it worth it... possibly?! That is a million dollar question!! Yes it is a lot of work. If you; /archives//html/RFI/2004-06/msg00048.html (7,973 bytes)
3. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Thu, 17 Jun 2004 17:09:03 -0500; Twisted pair cable picks up far less differential mode RF than untwisted cable, and the higher the twist ratio, the better the rejection. Go straight to CAT5. You may still have problems with common; /archives//html/RFI/2004-06/msg00049.html (7,637 bytes)
4. Re: [RFI] CAT 3 Cable? (score: 1): Author: David Jordan <wa3gin@erols.com>; Date: Thu, 17 Jun 2004 18:17:21 -0400; You don't have to replace the wiring. Get yourself an old AC brut force line filter from one of the surplus electronic warehouses or buy a new one from Arcade electronics. I used to run 1KW into a 40; /archives//html/RFI/2004-06/msg00050.html (8,173 bytes)
5. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Tom Rauch" <W8JI@contesting.com>; Date: Thu, 17 Jun 2004 20:38:38 -0400; CAT Virtually all the time the problem is common mode excitation, and the type of wire changes that very little if at all. As for beads, people just throw a few beads at the problem and assume they; /archives//html/RFI/2004-06/msg00054.html (8,970 bytes)
6. Re: [RFI] CAT 3 Cable? (score: 1): Author: "David Hachadorian" <K6LL@adelphia.net>; Date: Thu, 17 Jun 2004 19:17:36 -0700; force new filter the ran line I tried that once with an 8 amp Corcom line filter, and it noticeably attenuated the high frequencies on the phone circuit. The modem wasn't happy with it either. So, yo; /archives//html/RFI/2004-06/msg00055.html (8,365 bytes)
7. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Thu, 17 Jun 2004 22:43:51 -0500; My 6m SSB radio was getting into the landline in my wife's office. A 1" long Fair Rite #43 clamp-on took it right out. You might be surprised to learn that multiple turns around large ferrite cores y; /archives//html/RFI/2004-06/msg00057.html (8,871 bytes)
8. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 18 Jun 2004 08:20:14 +0100; Jim Brown wrote: On Thu, 17 Jun 2004 20:38:38 -0400, Tom Rauch wrote: As for beads, people just throw a few beads at the problem and assume they are making some profound change in the system. Actuall; /archives//html/RFI/2004-06/msg00058.html (9,091 bytes)
9. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Tom Rauch" <W8JI@contesting.com>; Date: Fri, 18 Jun 2004 04:44:59 -0400; octaves. I actuallysuspect most people with any background understand how multiple turns through a bead are better. The problem is applying the devices, not the "surprising" revelation N^2 often wor; /archives//html/RFI/2004-06/msg00059.html (10,330 bytes)
10. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Fri, 18 Jun 2004 08:19:49 -0500; Before you make this statement, you should measure chokes built with some of these cores. I have done so, and in a disciplined way. In general, the resistive component of the core's permeability (wha; /archives//html/RFI/2004-06/msg00061.html (13,043 bytes)
11. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Fri, 18 Jun 2004 08:59:36 -0500; Yes, it does, because Tom's post is aimed at the mindless application of clamp-ons, and mine is aimed at a thoughtful engineering approach. My original post observed that 1) replacing the parallel wi; /archives//html/RFI/2004-06/msg00062.html (9,284 bytes)
12. Re: [RFI] CAT 3 Cable? (score: 1): Author: Berry W6EZ <serazin@pacbell.net>; Date: Fri, 18 Jun 2004 11:42:21 -0700; In my own quest for rf proof phone lines, I too went the CAT 5 route and had little luck. What I finally did was twist all the unused wires together at the ends of the runs where the phones are and t; /archives//html/RFI/2004-06/msg00063.html (8,013 bytes)
13. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 18 Jun 2004 14:03:37 -0500; Reading the latest (July) QST, I see that I'm not alone in recommending this technique. See "Workbench" on pages 54-55, with a photo of about 10 turns of coax wound around a toroidal core. The author; /archives//html/RFI/2004-06/msg00064.html (8,336 bytes)
14. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 19 Jun 2004 10:30:20 -0400; CAT 5 route and together at the service drop. What you actually did was make a crude low-pass filter. This illustrates my point perfectly! Using ONLY a series impedance is not a very wise thing to d; /archives//html/RFI/2004-06/msg00065.html (9,138 bytes)
15. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 19 Jun 2004 11:01:43 -0400; built with some of I already have Jim. I just completed measurements a few weeks ago on 31 material using identical size samples to my standards of other materials. I always do this as an approval p; /archives//html/RFI/2004-06/msg00066.html (10,414 bytes)
16. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 20 Jun 2004 22:42:09 -0500; Tom, I think it's time to play "I'll show you mine and you show me yours." Here are data for a large Fair Rite clamp-on -- 2" OD, 1" ID, 2" long. http://audiosystemsgroup.com/BiggestClampZ.jpg http:/; /archives//html/RFI/2004-06/msg00070.html (9,162 bytes)

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