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1. [RFI] Filters that work (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 9 Jan 2003 08:44:18 +0000; I wrote the following in response to a question on the AMPS list, and though it might be useful to cross-post here. G4SWX has designed a range of highly effective RFI filters based on coax stubs - se; /archives//html/RFI/2003-01/msg00014.html (7,844 bytes)
2. [RFI] Shielding (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 7 Nov 2002 17:30:18 +0000; In transmitter RFI situations, we almost *can* see the RF, using a clip-on RF current meter. With it, you can see which cables have RF currents on them, and roughly how much. Without it, you really a; /archives//html/RFI/2002-11/msg00019.html (7,650 bytes)
3. [RFI] Shielding N4ZR (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 7 Nov 2002 20:25:44 +0000; Sorry, I forgot: "...and you can buy a clip-on RF current probe from Palomar Engineers, too." But wherever you get one, do get one. -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Edit; /archives//html/RFI/2002-11/msg00021.html (7,161 bytes)
4. [RFI] Monitor interferes with transmit audio (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 8 Nov 2002 15:02:29 +0000; Sounds like magnetic pickup. Monitors put out very strong magnetic fields. The audio circuit is literally a circuit - a loop, including the ground return path, and external magnetic fields will induc; /archives//html/RFI/2002-11/msg00024.html (7,555 bytes)
5. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 4 Aug 2002 09:34:24 +0100; Extra length of coax can help... but only if you do something useful with it. Remember first that the outer shield of the coax acts as an independent conductor (due to the skin effect). In this case; /archives//html/RFI/2002-08/msg00001.html (11,402 bytes)
6. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sun, 4 Aug 2002 19:08:39 +0100; Since you need lights up there anyhow, can you pick a cooler time of day... or night? Given the total length of cable and the number of turns, you're sure to get the diameter right because you don't; /archives//html/RFI/2002-08/msg00004.html (8,760 bytes)
7. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 6 Aug 2002 07:55:22 +0100; When it comes to "far-fetched" I'm obviously out of my league. I simply meant that <of all the cable layouts anyone would use in element will give maximum coupling. And indeed it will. -- 73 from Ian; /archives//html/RFI/2002-08/msg00012.html (9,672 bytes)
8. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 6 Aug 2002 22:29:35 +0100; Yes, that's correct. The main antenna element goes vertically upward from the feedpoint. The coax goes vertically downward from the feedpoint. A straight vertical line, extending upward from the grou; /archives//html/RFI/2002-08/msg00016.html (10,237 bytes)
9. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 7 Aug 2002 22:46:16 +0100; My apologies, Rob. Now that we're talking the same language, that's a very good question indeed... I thought I knew the answer, but you made me see that I didn't! To check this more carefully, I put; /archives//html/RFI/2002-08/msg00020.html (11,306 bytes)
10. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Wed, 7 Aug 2002 23:54:40 +0100; When you drive 1 amp into Wire 1, NEC tells you how much current flows in Wire 2, but it doesn't tell you why or how. Not absolutely certain (it's getting late over here). -- 73 from Ian G3SEK 'In Pr; /archives//html/RFI/2002-08/msg00022.html (8,941 bytes)
11. [RFI] Computer RFI problem (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 9 Aug 2002 22:25:45 +0100; Me too, so I've been forced to learn more about this subject than I'd ever wish to! - or else they blame the amp, and it shuttles back and forth uselessly to the manufacturer. Part of the difficulty; /archives//html/RFI/2002-08/msg00029.html (9,272 bytes)
12. 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)
13. 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)
14. 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)
15. 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)
16. Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 2 Feb 2004 14:00:02 +0000; Tom Rauch wrote, in response to: just came across an advertisement of a common-mode choke produced by RF-inquiry of Japan. They claim to provide at least 50 dB of reduction of common-mode-currents. I; /archives//html/RFI/2004-02/msg00004.html (9,775 bytes)
17. Re: [RFI] BPL -- copy of letter to st. URC (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 5 Mar 2004 09:03:36 +0000; Tom Cox wrote to his utility company: If such losses occur, will the utilities be allowed to make rate payers help them recover their investments? Since the majority of existing electrical customers; /archives//html/RFI/2004-03/msg00008.html (8,050 bytes)
18. Re: [RFI] TVI (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 7 Mar 2004 07:30:56 +0000; and video (VHS) players, each connected to three of those 6 TV sets, and big flat screen TV in a basement has 5 speakers (surrounded sound) with at least 10' of speaker wire each and this TV set is a; /archives//html/RFI/2004-03/msg00034.html (11,784 bytes)
19. Re: [RFI] Quiet Shack PC Systems? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 18 Mar 2004 21:40:58 +0000; Deni wrote: I'm always intrigued by the photos of other peoples shacks with the PC and monitor mounted right in among the radio gear. I have a conventional tower and CRT monitor which creates nasty Q; /archives//html/RFI/2004-03/msg00082.html (10,437 bytes)
20. Re: [RFI] Quiet Shack PC Systems? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 26 Mar 2004 09:19:13 +0000; Jim Brown wrote: If I'm not mistaken, CE compliance is written around the EN55103-1 and -2. The emissions standard is mandatory, however the susceptibility standard is essentially voluntary, since it; /archives//html/RFI/2004-03/msg00121.html (10,732 bytes)

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