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Total 1526 documents matching your query.

1. [TowerTalk] Re: W4AN Silent Key (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Apr 2004 11:53:02 -0600
Because I was inactive on HF for most of the last 18 years, I didn't get to know Bill, and worked him only a few times since my return in a contests. But because Bill was such an active supporter of
/archives//html/RFI/2004-04/msg00019.html (8,000 bytes)

2. 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)

3. 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)

4. Re: [RFI] Electrostatic filter rfi (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 28 Jun 2004 14:47:38 -0500
Nothing you have described is likely to have any effect at all at HF. Assuming that the trash is getting onto the power line, you need far more serious filtering than you have described, and filterin
/archives//html/RFI/2004-06/msg00088.html (8,951 bytes)

5. Re: [RFI] Interesting Wireless Broadband article (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 15 Jul 2004 08:06:39 -0500
My partner owns a former microwave site where we are setting up a ham station (see W6BX on qrz.com). He has just arranged to lease space to a local entreprenour (and radio guy) who is setting it up t
/archives//html/RFI/2004-07/msg00010.html (7,843 bytes)

6. Re: [RFI] RE: Broadband over Power Line (BPL) radio interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 16 Jul 2004 09:49:40 -0500
YES! And it is precisely BECAUSE we are the caneries, and that we are VOCAL canaries, that we are so critical to society. I'm not one to quote scripture, but there is a particularly relevant verse th
/archives//html/RFI/2004-07/msg00026.html (8,016 bytes)

7. Re: [RFI] Broadband over Power Line (BPL) radio interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 16 Jul 2004 22:15:41 -0500
I strongly agree with this. The issue is a there must be a disproof of their concept. If BPL is implemented, there WILL be BPL users next door to hams The sooner the incompatibility of this adjacency
/archives//html/RFI/2004-07/msg00057.html (12,815 bytes)

8. RE: [RFI] Power Line Noise in Indonesia (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 19 Jul 2004 08:39:24 -0500
a other without have While we're on this general topic -- one of my pro audio engineering friends has pointed out corona discharge as a chronic problem in coastal areas. Can someone address the mecha
/archives//html/RFI/2004-07/msg00077.html (8,640 bytes)

9. RE: [RFI] Canal water! (& BPL) (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 19 Jul 2004 22:54:24 -0500
I strongly agree. Constructive criticism, including, but not limited to, opposing points of view as to how things ought to be handled is NOT bashing, no matter how strongly stated. I am also an ARRL
/archives//html/RFI/2004-07/msg00141.html (10,842 bytes)

10. RE: [RFI] Canal water! (& BPL) (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 19 Jul 2004 23:02:20 -0500
I thought the one in the most recent QST (July?) titled "Harmful Interference" was damn good. Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.cont
/archives//html/RFI/2004-07/msg00144.html (7,913 bytes)

11. Re: [RFI] Question re: Whole House Surge Protection (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 21 Jul 2004 22:07:50 -0500
Yes. To understand that better, consider this. Virtually all "whole house" surge protectors, and nearly all branch circuit surge protectors, use shunt mode devices (most commonly, MOV's) to short the
/archives//html/RFI/2004-07/msg00166.html (9,285 bytes)

12. RE: [RFI] Amateur transceiver must accept interference? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 23 Jul 2004 11:35:39 -0500
It's got a computer interface and digital circuitry that can radiate trash. That part of the radio must conform to Part 15, hence the sticker. Jim Brown K9YC _________________________________________
/archives//html/RFI/2004-07/msg00176.html (7,222 bytes)

13. [RFI] GFI Outlets (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 25 Jul 2004 11:36:10 -0500
Here's a new one (for me, at least). I've always been a medium power guy -- 100 watt barefoot radios have been my standard for 49 years -- but I recently bought a Ten Tec Titan amp (legal limit out)
/archives//html/RFI/2004-07/msg00182.html (8,011 bytes)

14. [TowerTalk] Re: [RFI] Good Thread on Surge Protection (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 29 Jul 2004 13:20:30 -0500
Yes. One of the respondents, Ed Lethert, a respected Minneapolis-based consultant, recommended SurgeX products. I strongly second that recommendation. They make series-mode suppressors for branch cir
/archives//html/RFI/2004-07/msg00187.html (8,680 bytes)

15. [RFI] Intereference Database (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 30 Jul 2004 11:35:15 -0500
I think this database could be a lot more useful if it listed specific "birdie" or carrier frequencies and cross referenced to specific equipment or equipment types that produce those frequencies. Fo
/archives//html/RFI/2004-07/msg00188.html (7,171 bytes)

16. [RFI] Re: Interference Database - Ether RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 31 Jul 2004 18:37:57 -0500
DK1MAX posted a day or two ago about an interfernce database he was setting up. My post was a response to that. I've not run into problems with Ethernet receiving RFI, but I certainly do hear the Eth
/archives//html/RFI/2004-07/msg00190.html (9,653 bytes)

17. Re: [RFI] Ferrite Loops (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 14 Aug 2004 22:00:14 -0500
It is also important that they be measured over the range of frequencies at which you hope to use them. A wire running through a ferrite (or wrapped around it) can be analyzed as if it were a series
/archives//html/RFI/2004-08/msg00015.html (10,288 bytes)

18. Re: [RFI] New truck (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 16 Aug 2004 15:10:49 -0500
I think I recall comments here and elsewhere to the effect that Ford trucks are dogs for RF noise. Surely someone must have some experience. My 1999 Volvo S80 is pretty good, but not perfect. I could
/archives//html/RFI/2004-08/msg00030.html (6,700 bytes)

19. Re: [RFI] RFI to intercom (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 21 Aug 2004 23:57:18 -0500
Yes, if it is coupling differential mode onto the cable, twisting is a HUGE help. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.
/archives//html/RFI/2004-08/msg00047.html (7,114 bytes)

20. RE: [RFI] RFI to intercom (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 23 Aug 2004 10:19:36 -0500
For 20 meters, I would use 2-3 turns around #31 (best) or #43 (second best). My comments are based on a lot of measurements. Jim Brown K9YC _______________________________________________ RFI mailing
/archives//html/RFI/2004-08/msg00051.html (7,642 bytes)


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