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Total 57 documents matching your query.

1. [RFI] 144 MHz Interference Source (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Wed, 01 Oct 2003 20:39:06 -0500
Greetings to the list. I'm a new member, but an old timer (Extra since 1959) and vice-chair of the EMC Working Group of the Standards Committee of the Audio Engineering Society. I'm back on the air a
/archives//html/RFI/2003-10/msg00000.html (7,486 bytes)

2. Re: [RFI] Sources For RFI Suppression Ferrites (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 03 Nov 2003 09:21:31 -0600
There is excellent technical data available as a pdf download from Fair-Rite, one of the major mfrs. The catalog includes some information that is almost tutorial in nature, as well as a lot of data
/archives//html/RFI/2003-11/msg00003.html (10,335 bytes)

3. [RFI] RFI to Audio System (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 07 Nov 2003 08:53:05 -0600
Here's a post to a pro audio list to which I subscribe. I throught this would be of interest in view of the obvious RF generated by the NEC plasma. The Quad cable construction mentioned is one that u
/archives//html/RFI/2003-11/msg00024.html (8,113 bytes)

4. RE: [RFI] Formal RFI complaint to the FCC (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 10 Nov 2003 10:48:15 -0600
No, you are not the only one. I may need to buy a new set in the next few weeks, and I've got plasma on my mind! Jim Brown K9YC _______________________________________________ RFI mailing list RFI@co
/archives//html/RFI/2003-11/msg00030.html (8,320 bytes)

5. Re: [RFI] Unknown Signal (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sun, 07 Dec 2003 11:25:52 -0600
In Chicago I'm hearing what could be one signal with sidebands or multiple signals. It's moderately unstable (or has FM-like components) and sounds a lot like many signals that I hear scattered aroun
/archives//html/RFI/2003-12/msg00005.html (8,805 bytes)

6. Re: [RFI] Unknown Signal (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sun, 07 Dec 2003 14:45:24 -0600
Yes, that's what I'm describing in the first paragraph. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2003-12/msg00013.html (8,887 bytes)

7. Re: [RFI] Unknown Signal (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 08 Dec 2003 15:59:33 -0600
With an audio FFT set for 2 Hz resolution hooked up to the audio output of my Omni V in it's widest setting (nominal 2.4 kHz) tuned to 14317.63 USB, I can see at least 30 separate frequencies. It is
/archives//html/RFI/2003-12/msg00021.html (8,892 bytes)

8. Re: [RFI] KY filters? (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 19 Dec 2003 13:38:58 -0600
Don'[t even know what they are. But I do recommend wrapping the phone line a as many turns as you can through one of the 2.4" diameter toroids commonly used as a 1:1 balun at the input of antenna tun
/archives//html/RFI/2003-12/msg00039.html (8,345 bytes)

9. Re: [RFI] KY filters (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 19 Dec 2003 22:22:01 -0600
Thanks for the link, Rob. It's useful to know what options are available. One of the toroids I recommended costs $10-$12, depending on where you buy it. I would try a toroid before I spent more than
/archives//html/RFI/2003-12/msg00044.html (8,996 bytes)

10. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 22 Dec 2003 16:00:14 -0600
Some general thoughts from a pro audio guy who is also an EMC guy. 1. In the pro audio world, we have learned (the hard way) the critical importance of using TWISTED pair for loudspeaker wiring. I ha
/archives//html/RFI/2003-12/msg00048.html (11,478 bytes)

11. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 22 Dec 2003 16:34:35 -0600
The shielding enclosure of most electronics is a reasonable ground reference. A 747 has no connection to earth, but the shielding on its wiring works just fine. And even if that receiver had a 2-pron
/archives//html/RFI/2003-12/msg00049.html (8,123 bytes)

12. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 22 Dec 2003 18:03:54 -0600
I can do both. It's called "shield-current-induced noise," (SCIN). It was first described by Neil Muncy (ex-W3WJE) in an AES paper in 1994, based on research he did only at audio frequencies. I've do
/archives//html/RFI/2003-12/msg00054.html (12,535 bytes)

13. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 22 Dec 2003 19:15:57 -0600
If you go high enough in frequency it appears to do exactly what you think. It's just that it appears to simplify to that at a higher frequency than you think. Yes. When I have time, I intend to look
/archives//html/RFI/2003-12/msg00058.html (9,814 bytes)

14. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 03:17:08 -0600
No, I'm sorry that I can't do that. When you publish with AES, they have distribution rights. I don't get any of the money. I can promise you that the papers are worth your time and money if you are
/archives//html/RFI/2003-12/msg00060.html (8,709 bytes)

15. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 09:29:33 -0600
I'm sorry that you feel that way. I paid about $80 for my copy of Henry Ott's book, a bit less (per book) for "Antennas" by John Kraus, for the IEEE Emerald Book and Green Book, and for Tsaloviovich'
/archives//html/RFI/2003-12/msg00064.html (8,905 bytes)

16. Re: [RFI] shielding question (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 10:17:44 -0600
I do not. These papers are not math-filled tomes. They were written for audio engineers, many of whom have limited understanding of RF issues, so there is much in them of a tutorial nature. There's n
/archives//html/RFI/2003-12/msg00066.html (9,164 bytes)

17. Re: [RFI] Paying for information (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 11:34:30 -0600
Thanks to the efforts of some of my compadres on the AES Standards Committee, AES Standards can be downloaded at no cost. That wasn't true before our involvement. By contrast, many standards bodies t
/archives//html/RFI/2003-12/msg00072.html (10,481 bytes)

18. Re: [RFI] Eliminating TVI (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 12:03:39 -0600
Sounds like a really severe case! I suspect either power line or antenna line coupling, and I suspect the filters you are using are ineffective below 20 meters. The 43 material is primarily a VHF mat
/archives//html/RFI/2003-12/msg00074.html (8,093 bytes)

19. Re: [RFI] Paying for information (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 13:51:09 -0600
I have stated that it is common for foil/drain shielded cable to couple sufficient AM broadcast RF or RF from a 100 watt HF ham transmitter onto the signal pair for detection to occur in commonly use
/archives//html/RFI/2003-12/msg00078.html (7,876 bytes)

20. Re: [RFI] Paying for information (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 23 Dec 2003 22:07:55 -0600
The Journal of the AES is in most good technical libraries. The convention preprints are not. Northwestern University is the only library I know of in Chicago (where I live) that allows the general p
/archives//html/RFI/2003-12/msg00087.html (9,988 bytes)

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