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References: [ +from:ka5s@earthlink.net: 420 ]

Total 420 documents matching your query.

161. Re: [RFI] Power Line Ultrasound Detector (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Wed, 17 Aug 2005 08:35:12 -0700
I noticed the similarity on the Web page between the smaller listening dish and the ultrasonic listener. Could easily have been the wrong item -- or built to the wrong plan. Cortland house. _________
/archives//html/RFI/2005-08/msg00050.html (6,982 bytes)

162. Re: [RFI] Can Fluorescent bulbs cause RFI problems? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sun, 25 Sep 2005 21:26:59 -0700
Scott Neader KA9FOX posted: Some do and some don't. None of mine have been near as bad a lamp dimmer! Hmm. I am moving boat anchors and test equipment from $torage into the cabin; time to hook up a L
/archives//html/RFI/2005-09/msg00048.html (7,400 bytes)

163. [RFI] TEN Pt 15 FM transmitters = coverage (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sat, 8 Oct 2005 21:10:17 -0700
Here's an interesting Part 15 interference case. A "community broadcaster" set up _ten_ Part 15 transmitters in the FM broadcast band, covering the whole city of Sausalito, California. He's now off t
/archives//html/RFI/2005-10/msg00016.html (7,570 bytes)

164. [RFI] Corection: Not ten: SEVEN Pt 15 FM transmitters = coverage (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sat, 8 Oct 2005 21:12:21 -0700
broadcaster" set up SEVEN Part 15 transmitters ... _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-10/msg00017.html (6,926 bytes)

165. Re: [RFI] BPL news today's WSJ (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Tue, 20 Dec 2005 16:30:58 -0800
A quick ULS search shows 2124 active 30-50 MHz licensees in Texas -- and 142 of them have Dallas addresses. Cortland KA5S _______________________________________________ RFI mailing list RFI@contest
/archives//html/RFI/2005-12/msg00063.html (8,655 bytes)

166. Re: [RFI] lighting rfi (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sun, 1 Jan 2006 14:37:36 -0800
Rick, Some light sets run from LV switching mode PS's These are notorious. Some fixtures use noisy electronic ballasts. Your solution will require making any sources quieter, decoupling them from rad
/archives//html/RFI/2006-01/msg00005.html (7,989 bytes)

167. Re: [RFI] Computer cases and RFI (score: 1)
Author: Cortland Richmond <ka5s@earthlink.net>
Date: Tue, 3 Jan 2006 21:34:23 -0800 (GMT-08:00)
Here's what Part 15 says about testing computer motherboards: &Acirc;&sect; 15.32 Test procedures for CPU boards and computer power supplies. Power supplies and CPU boards used with personal computer
/archives//html/RFI/2006-01/msg00024.html (11,539 bytes)

168. Re: [RFI] EMI & EMC Conducted Noise Meaning? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Fri, 6 Jan 2006 15:27:08 -0800
That will depend HOW it fails to meet Class B -- and who it affects. It's not unusual to find switch mode PS's that meet Class B above 500 KHz or 1 Mhz -- and fail it at, say, 100 or 200 KHz and low
/archives//html/RFI/2006-01/msg00027.html (7,987 bytes)

169. Re: [RFI] EMI & EMC Conducted Noise Meaning? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Fri, 6 Jan 2006 18:34:57 -0800
Doc, I erred in saying there was a 10 dB difference between Class A and Class B. 10 dB difference is for radiated emissions; for conducted, it's worse. Limits are specified for particular bandwidths
/archives//html/RFI/2006-01/msg00031.html (10,900 bytes)

170. Re: [RFI] Brushless vs Brush Fans & RFI? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Tue, 10 Jan 2006 10:17:15 -0800
Hi again, Doc. No, I'd say it isn't. I learned in the military that brushes in high speed fans can fail after only a few days. That's why computer and equipment cooling fans don't use them. And these
/archives//html/RFI/2006-01/msg00037.html (7,795 bytes)

171. Re: [RFI] [TVI-RFI-EMI] Brushless vs Brush Fans & RFI? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Tue, 10 Jan 2006 10:28:15 -0800
Not, alas, probable. Possible, yes, though it might cost 1&cent;, and when you make a million fans, that 1&cent; for each adds up to the year-end bonus someone could have gotten. Cortland KA5S ______
/archives//html/RFI/2006-01/msg00038.html (10,217 bytes)

172. Re: [RFI] Tv interference (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sun, 22 Jan 2006 01:13:38 -0800
Steve, The HV igniter uses a ~10+ KV source and a spark gap and can do what you describe. Famous for it, in fact, and if Trane doesn't know, you're talking to the wrong folks there. See http://www.p
/archives//html/RFI/2006-01/msg00099.html (8,656 bytes)

173. Re: [RFI] Digital TV Box Generates 121.5MHz Signal (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sun, 22 Jan 2006 01:33:19 -0800
[SNIP] DBS TV card hackers were causing similar problems in Canada a couple of years ago. "According to an article in The Edmonton Sun, signals from pirated Bell ExpressVu cards are suspected of cau
/archives//html/RFI/2006-01/msg00100.html (8,538 bytes)

174. [RFI] California: The Switchers are Coming (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Mon, 23 Jan 2006 13:32:11 -0800
The California Energy Commission has just published an efficiency standard dated April 2005. It requires that by 1 July 2006 most appliances made or sold in California meet state mandates for efficie
/archives//html/RFI/2006-01/msg00102.html (8,519 bytes)

175. Re: [RFI] Help: Telephone Ringer Blown Out (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Wed, 15 Feb 2006 11:56:28 -0800
Pete has a good suggestion. As to why only the ringers went out, that's probably because they were low impedance to the lightning transient, and so carrried the bulk of its current until the energy
/archives//html/RFI/2006-02/msg00002.html (7,605 bytes)

176. Re: [RFI] RFI Direction Finding (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Fri, 17 Feb 2006 16:24:00 -0800
Yes, do try a small shielded loop. Here's one design that works fine on my VR-500 receiver: http://people.delphiforums.com/KA5S/the%20coax%20loop.JPG It can be made with three or four RS parts (as lo
/archives//html/RFI/2006-02/msg00005.html (8,764 bytes)

177. Re: [RFI] Leakage (was RFI Canceling RFI?) (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Fri, 10 Mar 2006 08:07:53 -0800
The max leakage for ITE is 3.5 ma; to get 60 amps there would have to be over 17 thousand of 'em. He had a crossed neutral/green, all right. And of course green wire is just a way to make sure break
/archives//html/RFI/2006-03/msg00038.html (7,446 bytes)

178. Re: [RFI] Defibrillator and RF Exposure Query (score: 1)
Author: Cortland Richmond <ka5s@earthlink.net>
Date: Sun, 14 May 2006 05:14:50 -0400 (GMT-04:00)
The sensitivity of a device to RF upset is determined by how strong the field is in which it is immersed, how it responds to the field and its modulation, and how efficient the device (or its connect
/archives//html/RFI/2006-05/msg00018.html (10,421 bytes)

179. Re: [RFI] RF Quiet Laptop for Mobile Console? (score: 1)
Author: Cortland Richmond <ka5s@earthlink.net>
Date: Fri, 19 May 2006 04:44:27 -0400 (GMT-04:00)
Not long ago, I tried running digital modes using a KAM-XL hooked up to a Fujitsu P5020 "Lifebook" laptop. This actually worked well -- quieter than my e-Machines T2642 -- until I hooked up a power s
/archives//html/RFI/2006-05/msg00029.html (10,410 bytes)

180. Re: [RFI] Honda Generator RFI? (score: 1)
Author: "Cortland Richmond" <ka5s@earthlink.net>
Date: Sat, 16 Sep 2006 22:53:15 -0400
is causing RFI on the line rather than through radiowaves (common mode) by moving the inverter-generator far away from my antennas and radios although usually, by necessity I need to run my Honda ve
/archives//html/RFI/2006-09/msg00009.html (7,245 bytes)

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