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1. [RFI] Filters that work (score: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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: 163): 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. [RFI] 433 Mhz Wireless Thermometer (score: 163): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 18 Dec 2001 17:21:01 +0000; Thanks for forwarding my earlier message, Ed. That's an interesting list of countries, and I hope they can "hold the line" to keep 433.92MHz a ham frequency. However, since Japan is not on the list,; /archives//html/RFI/2001-12/msg00050.html (8,823 bytes)
13. [RFI] Ground rod placement (score: 163): Author: Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 13 May 1998 09:29:43 +0100; Jack is absolutely right - of all the RFI investigation tools in the universe, the clamp-on RF ammeter is by far the most useful. It allows you to SEE where the unwanted currents are crawling around,; /archives//html/RFI/1998-05/msg00021.html (7,512 bytes)
14. [RFI] Spurious signal levels (score: 163): Author: Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 May 1998 17:40:18 +0100; Please can someone point me toward the FCC regulations on spurious signal levels from transmitters for the amateur service? Are they on the FCC web site? 73 from Ian G3SEK Editor, 'The VHF/UHF DX Boo; /archives//html/RFI/1998-05/msg00023.html (7,341 bytes)
15. [RFI] Spurious signal levels (score: 163): Author: Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 May 1998 21:44:46 +0100; Thanks very much, Ed. (No translation problems here - I'm married to an American teacher of English!) I'll also see if the full 97.307 is on the web site. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Bo; /archives//html/RFI/1998-05/msg00025.html (7,688 bytes)
16. [RFI] All is well in hamland (score: 163): Author: Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 28 Feb 1998 08:19:30 +0000; If you ask a specific question, you'll probably get answers from several people. If you make a constructive comment, you'll probably start a discussion. But if you expect to sit there passively and b; /archives//html/RFI/1998-02/msg00029.html (7,353 bytes)
17. [RFI] Low pass filters (score: 163): Author: Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 19 Jan 1998 22:47:52 +0000; Ed's statement might promote a common error about the difference between harmonic filtering requirements for HF and VHF transmitters. There is NO difference! A lowpass (or harmonic notch) filter is u; /archives//html/RFI/1998-01/msg00027.html (9,136 bytes)
18. Re: [RFI] high noise level... (score: 87): 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)
19. Re: [RFI] Quiet Shack PC Systems? (score: 87): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 26 Mar 2004 12:02:10 +0000; Jim Brown wrote: On Thu, 18 Mar 2004 21:40:58 +0000, Ian White, G3SEK wrote: Then feed each side separately through its own *three-wire* mains filter that includes a ground choke. Hmmm. Are you putti; /archives//html/RFI/2004-03/msg00122.html (12,348 bytes)
20. Re: [RFI] BPL Protest Opportunity? Give up? NO! (score: 87): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 10 May 2004 14:04:23 +0100; Alex wrote: "Ian White, G3SEK" wrote: It's still peanuts compared with the projected income from BPL, What is the projected income of BPL? Ask the people who are proposing it - "to infinity and beyon; /archives//html/RFI/2004-05/msg00107.html (9,513 bytes)

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