Mail Archive Search: <+from:Ian White>

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References: [ +from:Ian: 217 ] [ White: 671 ]

Total 68 documents matching your query.

21. Re: [RFI] Earth isolation (score: 87): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 9 Sep 2004 08:23:02 +0100; Jim Brown wrote: On Wed, 8 Sep 2004 22:39:22 +0100, Ian White, G3SEK wrote: The cure was to place an RF block in the shack mains feed, using a three-wire filter which includes a ground-line choke. Wh; /archives//html/RFI/2004-09/msg00052.html (10,141 bytes)
22. Re: [RFI] TV RFI (score: 87): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 29 Jan 2008 12:06:12 +0000; Great idea to use a field-strength meter! Just one thing: to avoid disturbing the setup that you're trying to investigate, don't forget to include a terminating resistor for the secondary winding. (I; /archives//html/RFI/2008-01/msg00073.html (10,024 bytes)
23. [RFI] Ground Question (score: 82): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 4 04:37:58 2003; wrote: It doesn't work any better than a single fat wire (and possibly less well), for the reasons Cortland and Ken have already given. Depending on the configuration of your antennas and feedlines,; /archives//html/RFI/2003-02/msg00004.html (9,132 bytes)
24. [RFI] GFI Problem (score: 82): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 05:04:22 2003; I had a similar problem of RF getting into the mains, in my case because the extra loading wire needed for the inverted-L on 160m brings the hot end of the antenna too close to the house. A better so; /archives//html/RFI/2003-02/msg00013.html (8,246 bytes)
25. [RFI] GFI Problem (score: 82): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 08:08:21 2003; A few afterthoughts... 1. Presumably in the USA you'd use a three-wire filter for a 115V AC feed (the modern type with a separate ground conductor) but you'd need a four-wire filter for the big feed; /archives//html/RFI/2003-02/msg00015.html (7,805 bytes)
26. [RFI] 160 Meter RFI Help Needed (score: 82): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sun Jan 26 17:46:25 2003; wrote: Sure you do - you've identified that you need some clues! So go and get some... Build or buy a clip-on RF current probe, and use it all around your system. When you actually *know* where the u; /archives//html/RFI/2003-01/msg00065.html (8,404 bytes)
27. [RFI] RFI clip-on probe? (score: 82): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jan 28 10:18:52 2003; There's a very important point here: in order to have a low impedance at the primary (the sampled wire), you *must* terminate the multi-turn secondary with a resistor. For example, with a reasonable; /archives//html/RFI/2003-01/msg00078.html (7,678 bytes)
28. Re: [RFI] high noise level... (score: 82): 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)
29. Re: [RFI] high noise level... (score: 82): 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)
30. Re: [RFI] Eliminating TVI (score: 82): 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)
31. Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes? (score: 82): 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)
32. Re: [RFI] BPL -- copy of letter to st. URC (score: 82): 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)
33. Re: [RFI] TVI (score: 82): 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)
34. Re: [RFI] Quiet Shack PC Systems? (score: 82): 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)
35. Re: [RFI] Quiet Shack PC Systems? (score: 82): 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)
36. Re: [RFI] Quiet Shack PC Systems? (score: 82): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 27 Mar 2004 16:32:21 +0000; Tom Rauch wrote: But from the lightning and RFI viewpoints, it is highly *un*desirable to cross-connect the mains and RF grounds at the shack. If you do, you are creating an alternative pathway for l; /archives//html/RFI/2004-03/msg00143.html (13,097 bytes)
37. Re: [RFI] Computer monitor RFI (score: 82): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 8 May 2004 09:29:09 +0100; Alan Beagley wrote: The Sony 15" monitor connected to the computer I am using with my rig generates an enormous amount of RFI: S9 signals at intervals on 20m and up, the intervals depending on the sc; /archives//html/RFI/2004-05/msg00091.html (9,479 bytes)
38. Re: [RFI] BPL Protest Opportunity? Give up? NO! (score: 82): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 10 May 2004 09:09:38 +0100; Richard (Rick) Karlquist (N6RK) wrote: Or they're say, go ahead and sue, and if you win, the monetary damages will be zero (or the proverbial one dollar), because ham radio is not a business, ham rad; /archives//html/RFI/2004-05/msg00105.html (9,501 bytes)
39. Re: [RFI] BPL Protest Opportunity? Give up? NO! (score: 82): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Fri, 21 May 2004 08:07:18 +0100; Hare,Ed, W1RFI wrote: For a rough estimate, *conservatively* assume 200,000 active amateurs. Conservatively, do they have, on average, $5,000 invested in the cost of their equipment, antennas, towers; /archives//html/RFI/2004-05/msg00140.html (10,418 bytes)
40. Re: [RFI] Complex Impedance Measurement Instruments (score: 82): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 3 Jun 2004 15:36:29 +0100; W0UN -- John Brosnahan wrote: You might check out http://www.qsl.net/n2pk/ and also look at the TAPR design that was teased at Dayton and will be published in the next issue of QEX. The N2PK vector n; /archives//html/RFI/2004-06/msg00002.html (7,798 bytes)

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