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References: [ +from:jim@audiosystemsgroup.com: 1809 ]

Total 1809 documents matching your query.

101. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 28 Jul 2005 09:19:48 -0500
I agree with you completely! Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-07/msg00045.html (8,589 bytes)

102. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 06 Aug 2005 10:00:42 -0500
Frank, Why? You are beating a dead horse. You are hearing Ethernet traffic, radiated common mode from the Ethernet wiring, and directly from poorly shielded Ethernet gear. Jim Brown K9YC ____________
/archives//html/RFI/2005-08/msg00010.html (6,886 bytes)

103. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 09 Aug 2005 15:45:56 -0500
That should kill everything except what the boxes radiates due to poor shielding, and from their power leads. I wouldn't expect that to be a fix unless you use a lot better quality gear. The problem
/archives//html/RFI/2005-08/msg00019.html (8,818 bytes)

104. Re: [RFI] Power Line Ultrasound Detector (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 16 Aug 2005 15:18:23 -0500
At a hamfest this past weekend, I paid about $10 for a used 432 Yagi that is about 4 ft long and has a coax connector on it and a mast clamp on one end. That's pretty portable -- it wouldn't be to to
/archives//html/RFI/2005-08/msg00040.html (8,486 bytes)

105. Re: [RFI] GFI Outlets (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 17 Aug 2005 10:41:23 -0500
I wouldn't. I can run a KW on 160-10m into wire dipoles and long wires that are within 20 ft of several GFI's. When I first fired up the KW, one was constantly tripping, and eventually smoked. I repl
/archives//html/RFI/2005-08/msg00051.html (7,805 bytes)

106. Re: [RFI] BPL Propaganda, ARRL Rebuttal on NPR's Morning Edition (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 18 Aug 2005 16:53:30 -0500
As noted, a VERY effective rebuttal was read today on Morning Edition. So the local reporter, Wade Goodwin, who reported the story was hornswoggled, but at least NPR had the professionalism to choose
/archives//html/RFI/2005-08/msg00074.html (8,944 bytes)

107. Re: [RFI] Internet Cable interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 29 Sep 2005 07:39:37 -0500
I don't know about the +/- 61 kHz component, but the 14030 stuff is Ethernet-related, and is emitted by MANY devices that use Ethernet for their interconnection, including, but not limited to, cable
/archives//html/RFI/2005-09/msg00066.html (9,179 bytes)

108. [RFI] Toyota SUV's For Mobile? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 30 Oct 2005 19:50:33 -0500
I'm thinking that I want to buy a Toyota Sequoia (an SUV on their Tundra truck frame) or Land Cruiser. Does anyone have HF mobile experience with either of these (or other big Toyotas or equivalent L
/archives//html/RFI/2005-10/msg00041.html (6,563 bytes)

109. Re: [RFI] Stereo/audio EMC question (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 27 Nov 2005 12:58:26 -0600
Virtually ALL computer audio interfaces have massive pin 1 problems, and are thus open doors for common mode RF. In other words, those audio interface cables function as antennas, and the resulting R
/archives//html/RFI/2005-11/msg00013.html (8,122 bytes)

110. Re: [RFI] stereo/audio EMC (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 Nov 2005 00:35:43 -0600
That's part of my standard practice. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-11/msg00016.html (6,977 bytes)

111. Re: [RFI] 160m sets off CO Detector (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 Nov 2005 00:40:54 -0600
Bad advice. Simple beads are useless below about 50 MHz. For a problem on 160m, you need a choke wound on the big #31 toroids discussed in my ferrite paper. http://audiosystemsgroup.com/publish And K
/archives//html/RFI/2005-11/msg00017.html (6,863 bytes)

112. Re: [RFI] 1996 Lincoln Town Car (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 07 Dec 2005 08:28:50 -0600
One of my friends is chief engineer of a 50 kW clear channel AM. Their transmitter is in the far SW burbs of Chicago. He told me several years ago that he got lots of phone calls from owners of Fords
/archives//html/RFI/2005-12/msg00007.html (7,818 bytes)

113. Re: [RFI] RF Proof Computer Speakers? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 07 Dec 2005 23:19:41 -0600
Yes. Virtually computer audio gear and sound cards have pin 1 problems, which is the basic cause of the RFI,. and the mulit-turn ferrite choke is a pretty good fix. The number of turns and the ferrit
/archives//html/RFI/2005-12/msg00017.html (7,429 bytes)

114. Re: [RFI] Electric company problem (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 10 Dec 2005 21:15:25 -0600
I agree with almost everything you are saying with respect to cancellation of multiple sources and azimuth, except for one VERY important thing. A noise canceller is SHIFTING the phase of the noise s
/archives//html/RFI/2005-12/msg00040.html (9,901 bytes)

115. Re: [RFI] Touch Lamp and 2m (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 25 Dec 2005 11:55:14 -0600
On Sun, 25 Dec 2005 12:32:01 -0500, WA3GIN in Alex. City, VA wrote: I assume that something is connected by wires. The wire(s) will act as a an antenna, both receiving your transmitted RF and radiati
/archives//html/RFI/2005-12/msg00072.html (7,921 bytes)

116. Re: [RFI] Monitor RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 01 Jan 2006 13:45:49 -0600
I have three 20" Dell LCD's, two of which are the same model. In fact, we now have no CRT monitors. All use wall warts. I have a lot of noise at my Chicago QTH, but I've never been able blame any of
/archives//html/RFI/2006-01/msg00002.html (7,448 bytes)

117. Re: [RFI] Monitor RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 01 Jan 2006 18:16:56 -0600
WHAT noise problem? As of now, none has been observed. Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2006-01/msg00006.html (7,184 bytes)

118. Re: [RFI] lighting rfi (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 01 Jan 2006 18:26:30 -0600
It is likely that much of the noise is radiated by wires close to the source. Electronic ballasts have become quite popular, because they are relatively energy-efficient, and may be the source of the
/archives//html/RFI/2006-01/msg00008.html (7,981 bytes)

119. Re: [RFI] Monitor RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 02 Jan 2006 14:11:22 -0600
I agree. EM radiation at a distance is generally more closely related to current than to voltage. I would be most concerned with wires carrying strong RF current flowing on wires of significant lengt
/archives//html/RFI/2006-01/msg00014.html (7,491 bytes)

120. Re: [RFI] Computer cases and RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 02 Jan 2006 17:22:05 -0600
Oh -- it's the fault of the cable that the computer puts the RF current on the cable? :) Let's be clear. ALL of that trash is coming from the electronics -- either the computer, the monitor, the netw
/archives//html/RFI/2006-01/msg00017.html (8,033 bytes)


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