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181. Re: [RFI] RFI to clock radio (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 07 Feb 2007 09:16:07 -0800
Several questions/answers. 1) The long wire probably has something approaching a current maxima near the transmitter, which establishes a very strong magnetic field around it. Since this is also clos
/archives//html/RFI/2007-02/msg00014.html (8,595 bytes)

182. Re: [RFI] Hyperlan interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 09 Feb 2007 08:55:00 -0800
If you're right, what you need are common mode ferrite chokes on the LAN cables that are connecting the RF link to your Ethernet system (and maybe the power supply). Don't be too sure that you are ri
/archives//html/RFI/2007-02/msg00018.html (7,264 bytes)

183. Re: [RFI] New to the list - searching for 80 meters noise (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 11 Feb 2007 15:30:28 -0800
Don't worry about the ENTIRELY SELF-CONTAINED solar powered lights that typically are a single LED (or two), with a solar cell on top and a pair of AA's inside. These are harmless. You're looking for
/archives//html/RFI/2007-02/msg00025.html (8,209 bytes)

184. Re: [RFI] All band handheld receivers (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 11 Feb 2007 16:08:08 -0800
My VHF/UHF talkie, a Yaesu TH-F6A, also includes a general coverage receiver, and a built-in loopstick that is the default antenna below 10 MHz. It's not very sensitive, but that's not always a bad t
/archives//html/RFI/2007-02/msg00027.html (7,957 bytes)

185. Re: [RFI] New to the list - searching for 80 meters noise (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 12 Feb 2007 15:50:33 -0800
Keep at it with your AM radio, preferably tuned to the very top of the band, which will hopefully be more representative of 80M. Jim K9YC _______________________________________________ RFI mailing l
/archives//html/RFI/2007-02/msg00035.html (8,442 bytes)

186. Re: [RFI] Hyperlan interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 14 Feb 2007 05:30:51 -0800
No, because that's probably not how the RFI is probably is being coupled. I have no idea. I suggest that you study my tutorial on RFI to understand the likely coupling mechanisms. Hopefully that will
/archives//html/RFI/2007-02/msg00039.html (7,315 bytes)

187. Re: [RFI] CO Detector (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 15 Feb 2007 22:21:41 -0800
This is all a red herring, and meant to suggest that the ham might be at fault. When smoke detectors detect RF instead of smoke, the root cause is a problem with the detector, not the radio transmitt
/archives//html/RFI/2007-02/msg00045.html (8,578 bytes)

188. Re: [RFI] Choosing Snap-On Toroid for 6M? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 19 Feb 2007 13:48:37 -0800
Yes. If you study the data, the small air gap of the clamp-ons is mostly a factor at lower frequencies, but no big deal at higher frequencies. But the clamp-ons are about twice the cost for equivalen
/archives//html/RFI/2007-02/msg00055.html (9,051 bytes)

189. Re: [RFI] Computer Hash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 25 Feb 2007 23:20:14 -0800
out Take a look at the RFI tutorial on my website. http://audiosystemsgroup.com/RFI-Ham.pdf Some questions: 1) Does the noise go away (or get weaker) if you disconnect some or all of the wires plugge
/archives//html/RFI/2007-02/msg00062.html (8,160 bytes)

190. Re: [RFI] HIGH POWER and RFI... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 08:43:51 -0800
It is VERY important that you make you neighbor understand that THIS is the cause of his problem, not your station. He would have the same problem if he lived near any other transmitter, like a broad
/archives//html/RFI/2007-03/msg00001.html (8,136 bytes)

191. Re: [RFI] HIGH POWER and RFI... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 19:18:26 -0800
I spent a month writing the tutorial referenced in the previous post (and three years doing the research on ferrites). A good starting place for you and others with this kind of problem would be to s
/archives//html/RFI/2007-03/msg00003.html (6,859 bytes)

192. Re: [RFI] Cordless 5.8ghz phones (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 14 Mar 2007 10:50:06 -0800
Yes. Telephones are notorious for receiving RFI because of their poor design. The K-Com filters are known to work on the RF coupled from the phone line. Google to find them. Yes. And you may find tha
/archives//html/RFI/2007-03/msg00008.html (7,197 bytes)

193. Re: [RFI] Very nasty noise (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 19 Mar 2007 11:00:35 -0700
Perhaps a battery charger for someone's new drill, mobility cart, etc. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman
/archives//html/RFI/2007-03/msg00019.html (6,595 bytes)

194. Re: [RFI] Variable speed drives (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 27 Mar 2007 08:35:39 -0700
On Tue, 27 Mar 2007 09:36:38 -0500, dgsvetan@rockwellcollins.com wrote: Yes. We occasionally run into big problems with VFD's in pro audio installations, where they are used for elevators, HVAC syste
/archives//html/RFI/2007-03/msg00031.html (8,587 bytes)

195. Re: [RFI] Solar Arrays, etc. (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 07 May 2007 02:56:19 -0700
YES! AE6RF, a neighbor of mine, is currently attempting to beat his neighbor's solar system into submission. One potential cause is an current impulsing system designed to prevent degradation of the
/archives//html/RFI/2007-05/msg00001.html (6,742 bytes)

196. Re: [RFI] Noisey PSU (Laptop) on HF Decodeing (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 May 2007 17:57:23 -0700
I own five IBM T-series laptops (T20, T21, T22, T41), and none of the power supplies have RFI issues. In Chicago, I used them within a few yards of receiving antennas. Here in CA, I've got a lot more
/archives//html/RFI/2007-05/msg00064.html (8,696 bytes)

197. Re: [RFI] Noisey PSU (Laptop) on HF Decodeing (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 May 2007 20:52:04 -0700
Don't count on that being a factor -- a 2.4GHz antenna is VERY unlikely to be big enough to couple RFI from your ham station to any place it can get detected unless you're on 2.4 GHz, and then it wou
/archives//html/RFI/2007-05/msg00066.html (7,898 bytes)

198. Re: [RFI] Long distance grounding (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 14 Jun 2007 17:55:01 -0700
Computer systems, especially sound cards, but also serial ports, are notorious for being built with "pin 1 problems." A connection to earth is rarely a fix for RFI. Proper shield termination is. See
/archives//html/RFI/2007-06/msg00016.html (8,363 bytes)

199. Re: [RFI] TVI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 20 Jun 2007 21:03:19 -0700
Sure. Lousy shielding is a common problem and possible culprit. In other words, it could be picked up on the wiring within the TV. That means replacing the TV. However: It still might be coming in on
/archives//html/RFI/2007-06/msg00020.html (7,137 bytes)

200. Re: [RFI] N6CW TVI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 22 Jun 2007 10:07:50 -0700
I agree with ALL of Tom's comments, including his bonding recommendations for TV antennas (and cable TV lead-ins) and about his comments on filters. That bonding will certainly divert any common mode
/archives//html/RFI/2007-06/msg00029.html (10,099 bytes)

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