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Total 1945 documents matching your query.

161. Re: [RFI] Interference on TV using 2 meters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 25 Oct 2006 22:19:05 -0700
Yes. Another symptom of this leakage is carriers on repeater frequencies. These are the carriers for the TV channels (or sidebands of significant components of the video, like the line rate, harmonic
/archives//html/RFI/2006-10/msg00048.html (8,054 bytes)

162. Re: [RFI] Interference on TV using 2 meters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 26 Oct 2006 20:54:04 -0700
Make your own with Snap n Seal connectors and a good MATV/CATV coax. Look for an RG-59 or RG-6 that is at least double shielded (quad-shielded is better), and get connectors to match. A year or two a
/archives//html/RFI/2006-10/msg00052.html (7,627 bytes)

163. Re: [RFI] FW: Interference on TV using 2 meters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 28 Oct 2006 12:55:18 -0700
While I certainly don't condone intentional QRM, when the cable system chose to convert TV to VHF frequencies allocated to other users, it assumed the responsibility for preventing QRM to and from li
/archives//html/RFI/2006-10/msg00057.html (8,146 bytes)

164. Re: [RFI] RFI Proof Computer speakers needed!!! (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 31 Oct 2006 23:03:17 -0700
Hi Tim, Study the Ferrites and RFI tutorial on my website, especially the Power Point that includes material about "the pin 1 problem." The latter is a major cause of RFI, and virtually ALL computer
/archives//html/RFI/2006-11/msg00001.html (7,564 bytes)

165. Re: [RFI] [YCCC] Interference to CO Alarm (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 07 Nov 2006 16:46:41 -0700
The CO Alarm is acting as a radio receiver, and we all know that a receiver needs an antenna. Thus, ALWAYS begin by asking What receiving antenna(s) is (are) connected to the device receiving the in
/archives//html/RFI/2006-11/msg00019.html (8,705 bytes)

166. Re: [RFI] IN-band Filters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 07 Nov 2006 17:30:40 -0700
That is by far your best solution. As the architect of some competitively scoring FD stations, I agree with others who have noted that stubs don t have nearly enough Q, and that heroic measures are n
/archives//html/RFI/2006-11/msg00021.html (7,695 bytes)

167. Re: [RFI] 40M TVI problem (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 13 Nov 2006 09:50:42 -0700
http://audiosystemsgroup.com/publish See the tutorials, with measured data, for ferrite chokes in several common and useful configurations at the link above. What you probably need is a choking Z of
/archives//html/RFI/2006-11/msg00031.html (7,252 bytes)

168. Re: [TowerTalk] [RFI] Haolgens AND . . . (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 20 Nov 2006 12:02:24 -0800
I have the same experience with really nasty switching power supplies for LV lighting fixtures in the house I bought here in CA. Where do you buy them? Can you tell us pecific mfrs and/or part number
/archives//html/RFI/2006-11/msg00067.html (8,437 bytes)

169. Re: [RFI] RFI/EMI MAJOR Problems (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 29 Nov 2006 22:59:13 -0800
I disagree. N3OX was right on target -- the wire that you are calling "ground" is part of the antenna, and it's carrying the full the antenna current and is radiating into your home equipment. Reson
/archives//html/RFI/2006-11/msg00087.html (10,393 bytes)

170. Re: [RFI] Philips Energy Saving Bulbs? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 04 Dec 2006 06:09:34 -0800
CA electrical rates are VERY high (a graduated scale that works out to be roughly 3X what I paid in Chicago for the same kWh). My first electricity bills put me in serious energy efficiency mode, and
/archives//html/RFI/2006-12/msg00006.html (8,259 bytes)

171. Re: [RFI] ROAD RUNNER CABLE INTERNET SERVICE RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 07 Dec 2006 08:49:02 -0800
I have cable internet service from Comcast here in CA, and had it in Chicago from another vendor. It works fine here, and worked fine in Chicago -- most of the time. But I switched to a DSL service i
/archives//html/RFI/2006-12/msg00020.html (7,950 bytes)

172. Re: [RFI] Low voltage lighting solid state "transformers" (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 17 Dec 2006 08:23:10 -0800
I have a half dozen or so of these little monsters in the home I bought in CA. I've done some things to suppress them, with varying degrees of success. The problem is physical space to mount either t
/archives//html/RFI/2006-12/msg00029.html (10,201 bytes)

173. Re: [RFI] Low voltage lighting solid state "transformers" (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 17 Dec 2006 13:04:00 -0800
I doubt it. The AC wiring between the noise source and the filter will act as an antenna, and in a typical building, is likely to be long enough to be a pretty effective radiator on the HF bands. Now
/archives//html/RFI/2006-12/msg00033.html (9,100 bytes)

174. Re: [RFI] Low voltage lighting solid state "transformers" (long) (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 19 Dec 2006 10:08:14 -0800
Thanks for the link. In addition to this one, they also list model WN 30913, which is a toroidal transformer rated at 50 watts. Retail is listed at $76. The problem is that this part probably won't f
/archives//html/RFI/2006-12/msg00048.html (8,405 bytes)

175. Re: [RFI] New Noise on 80 m (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 04 Jan 2007 10:21:46 -0800
Chasing RFI can be a bit like Sherlock Holmes detective work. Think of what equipment might have been purchased (or received as a gift) at Christmas and used during the evening. Some common RFI sourc
/archives//html/RFI/2007-01/msg00002.html (6,857 bytes)

176. Re: [RFI] Strange radio static problem in vehicle (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 15 Jan 2007 16:56:43 -0800
Chassis bonding in some contemporary vehicles is really poor (or non-existent). The body of my 2006 Toyota Sequoia (large SUV, based on big Tundra pickup) has really awful electrical integrity. It's
/archives//html/RFI/2007-01/msg00006.html (7,302 bytes)

177. Re: [RFI] N6TR JA noise update (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 25 Jan 2007 10:26:07 -0800
VHF noise can be easier to pinpoint, because the strongest radiation tends to be from wires much closer to the source. Driving/walking around with a talkie or mobile VHF rig MIGHT help you zero in on
/archives//html/RFI/2007-01/msg00018.html (6,942 bytes)

178. Re: [RFI] Help on speed drive motor controller RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 28 Jan 2007 14:38:55 -0800
You won't get rid of them -- they are far too closely integrated into the design of the unit. You MAY be able to reduce the RF trash a lot. I suggest that you download and study the tutorial on RFI t
/archives//html/RFI/2007-01/msg00023.html (8,907 bytes)

179. Re: [RFI] Help on speed drive motor controller RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 29 Jan 2007 08:43:33 -0800
I don't think Tom was attempting to disagree with you or me, but rather to add the benefit of his direct experience to the discussion. And it shows pretty clearly that we're all in agreement on this
/archives//html/RFI/2007-01/msg00028.html (7,731 bytes)

180. Re: [RFI] DSL INTERFERENCE FROM 160 METERS (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 06 Feb 2007 21:01:46 -0800
14 turns of the phone cable around a Fair-Rite #31 2.4" o.d. toroid (the shape commonly called FT-240) makes a very effective common mode choke at 2 MHz. For more details, see the tutorial on my webs
/archives//html/RFI/2007-02/msg00011.html (7,588 bytes)

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