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Total 2135 documents matching your query.

181. 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)

182. [RFI] Electric company problem (score: 1)
Author: "Mike Brown" <k9mi@sbcglobal.net>
Date: Sat, 10 Dec 2005 16:27:21 -0000
Early this fall, my 4th case of rfi from electric company hardware in 9 years, reared its ugly head. Number 1&2 were fixed, although it was around 3 or 4 months on each case. Number 3 took ARRL invol
/archives//html/RFI/2005-12/msg00021.html (7,156 bytes)

183. Re: [RFI] Electric company problem (score: 1)
Author: "Mike Brown" <k9mi@sbcglobal.net>
Date: Sat, 10 Dec 2005 21:04:34 -0000
Hi Ed No, he did not track it down to high voltage lines. He is passing the buck to other things, and I've been down this road too many times that I am fairly certain it's hardware on a nearby pole t
/archives//html/RFI/2005-12/msg00029.html (11,380 bytes)

184. 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)

185. Re: [RFI] Electric company problem (score: 1)
Author: "Mike Brown" <k9mi@sbcglobal.net>
Date: Sun, 11 Dec 2005 04:42:48 -0000
I've got a 30 second .wav file of 20 over noise on 14 mhz if anyone would like to listen to it. Mike, K9MI _______________________________________________ RFI mailing list RFI@contesting.com http://l
/archives//html/RFI/2005-12/msg00041.html (8,389 bytes)

186. Re: [RFI] Electric company problem (score: 1)
Author: "Mike Brown" <k9mi@sbcglobal.net>
Date: Sun, 11 Dec 2005 16:29:20 -0000
WX5L: In years past I have always greatly increased my success rate to resolve line noise by doing most of the dectective legwork. It seems if you make a complaint for the power company to come out a
/archives//html/RFI/2005-12/msg00047.html (11,640 bytes)

187. 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)

188. 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)

189. 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)

190. 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)

191. 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)

192. 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)

193. Re: [RFI] Computer cases and RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 03 Jan 2006 04:19:48 -0600
It would be quite nice if that were true, and for the computers themselves, it very well may be. But computers are a tiny fraction of the equipment that generates trash for us. There are power suppli
/archives//html/RFI/2006-01/msg00021.html (8,043 bytes)

194. Re: [RFI] Fw: Re: Ferrite Beads (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 05 Jan 2006 11:01:01 -0600
I suspect they are using them because I published all my info about the new mix. Yes. Expect to pay < $4 for the toroids from a distributor. The first price break is at 250 pieces. It won't be called
/archives//html/RFI/2006-01/msg00025.html (19,550 bytes)

195. [RFI] Experience With this Flexible Raceway (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 10 Jan 2006 17:05:26 -0600
I've got an application for "liquid tight" flexible raceway to shield outdoor low voltage wiring that is known to radiate RF trash and be picked up by my HF and VHF antennas (160 meters through 2 met
/archives//html/RFI/2006-01/msg00040.html (6,963 bytes)

196. Re: [Amps] new mobile amps from THP (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 11 Jan 2006 09:06:38 -0600
YES! I just put a 100w HF transceiver in my 2006 Toyota Sequoia and drive to CA with it. Power straight from the battery, antenna a Hamstick on the luggage rack, shield of coax bonded to a big bolt h
/archives//html/RFI/2006-01/msg00043.html (9,016 bytes)

197. Re: [RFI] Mobile amps and vehicle issues (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 11 Jan 2006 12:39:54 -0600
Of course. But there is no excuse for poor wiring practices, or for not bonding the body, for omitting ferrites at sensitive points in the circuit, or for designing those very complex systems with pi
/archives//html/RFI/2006-01/msg00049.html (7,479 bytes)

198. Re: [RFI] Mobile amps and vehicle issues (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 12 Jan 2006 10:26:04 -0600
<SNIP> I agree completely, BUT the commonly accepted definition of "an order of magnitude" is a decade of frequency -- 10:1. The difference between the 20 meter band and public safety frequencies at
/archives//html/RFI/2006-01/msg00058.html (8,814 bytes)

199. Re: [RFI] Mobile amps and vehicle issues (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 12 Jan 2006 13:08:14 -0600
Yes. My Volvo S80 received NO RFI from my 100w HF rigs, and was moderately quiet with NO filtering at all by me. If I hadn't given it to my XYL's daughter, I would have dug in and cleaned some of the
/archives//html/RFI/2006-01/msg00062.html (9,959 bytes)

200. Re: [RFI] Tv interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 19 Jan 2006 12:58:51 -0600
If the product is used at home, shouldn't it carry a sticker saying that complies with FCC Part 15 as a Class B device? Does it have that sticker? If the manufacturer won't fix the RFI, it might be w
/archives//html/RFI/2006-01/msg00083.html (7,542 bytes)

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