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81. [TowerTalk] Re: [RFI] Good Thread on Surge Protection (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 29 Jul 2004 13:20:30 -0500; Yes. One of the respondents, Ed Lethert, a respected Minneapolis-based consultant, recommended SurgeX products. I strongly second that recommendation. They make series-mode suppressors for branch cir; /archives//html/RFI/2004-07/msg00187.html (8,680 bytes)
82. [RFI] Intereference Database (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 30 Jul 2004 11:35:15 -0500; I think this database could be a lot more useful if it listed specific "birdie" or carrier frequencies and cross referenced to specific equipment or equipment types that produce those frequencies. Fo; /archives//html/RFI/2004-07/msg00188.html (7,171 bytes)
83. [RFI] Re: Interference Database - Ether RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 31 Jul 2004 18:37:57 -0500; DK1MAX posted a day or two ago about an interfernce database he was setting up. My post was a response to that. I've not run into problems with Ethernet receiving RFI, but I certainly do hear the Eth; /archives//html/RFI/2004-07/msg00190.html (9,653 bytes)
84. Re: [RFI] Ferrite Loops (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 14 Aug 2004 22:00:14 -0500; It is also important that they be measured over the range of frequencies at which you hope to use them. A wire running through a ferrite (or wrapped around it) can be analyzed as if it were a series; /archives//html/RFI/2004-08/msg00015.html (10,288 bytes)
85. Re: [RFI] New truck (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 16 Aug 2004 15:10:49 -0500; I think I recall comments here and elsewhere to the effect that Ford trucks are dogs for RF noise. Surely someone must have some experience. My 1999 Volvo S80 is pretty good, but not perfect. I could; /archives//html/RFI/2004-08/msg00030.html (6,700 bytes)
86. Re: [RFI] RFI to intercom (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 21 Aug 2004 23:57:18 -0500; Yes, if it is coupling differential mode onto the cable, twisting is a HUGE help. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.; /archives//html/RFI/2004-08/msg00047.html (7,114 bytes)
87. RE: [RFI] RFI to intercom (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 23 Aug 2004 10:19:36 -0500; For 20 meters, I would use 2-3 turns around #31 (best) or #43 (second best). My comments are based on a lot of measurements. Jim Brown K9YC _______________________________________________ RFI mailing; /archives//html/RFI/2004-08/msg00051.html (7,642 bytes)
88. Re: [RFI] Re: RFI to intercom (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 23 Aug 2004 12:09:25 -0500; identifies M&S Music on the Model sticker at my house (which has no RFI problem) and an identical unit at my neighbors, who can hear me on all 6 speakers, when I operate on 12 and 10 meters, I have t; /archives//html/RFI/2004-08/msg00053.html (8,602 bytes)
89. Re: [RFI] Recent Posting on RFI with intercom. (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 23 Aug 2004 14:07:07 -0500; a FM That's because it isn't the FM radio that is causing the problem, but rather that the RF current flowing on the shield of the FM antenna is getting into the intercom's electronics. In other word; /archives//html/RFI/2004-08/msg00057.html (9,418 bytes)
90. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 14:24:58 -0500; MDS? Is there some particular problem you are having? Tom Rauch has observed, and I generally agree, that most "RF in the shack" problems are really antenna problems. I would extend that statement to; /archives//html/RFI/2004-09/msg00044.html (9,491 bytes)
91. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 22:44:18 -0500; What you really did was reduce the current flowing in those unintential antennas by adding impedance to the return path. That was a band-aid made necessary by the pin 1 problems in the gear. The more; /archives//html/RFI/2004-09/msg00048.html (8,267 bytes)
92. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Sep 2004 23:12:41 -0500; That is not the model I am thinking of. Rather, it is of a cable acting as a short long-wire antenna, and there is a current path for it, just as with any antenna. The current path for many ( most) l; /archives//html/RFI/2004-09/msg00049.html (9,761 bytes)
93. Re: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 09 Sep 2004 07:50:06 -0500; No. You have several misunderstandings here. 1. The so-called pin 1 problem is a mis-wiring of a SHIELD connnection. 2. It is NOT associated with intentional antennas -- that is, the antennas we norm; /archives//html/RFI/2004-09/msg00054.html (11,595 bytes)
94. RE: [RFI] Earth isolation (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 09 Sep 2004 09:10:06 -0500; Leave out the word "characteristic" -- it's not a transmission line. Just plain old series impedance. Now the sentence is right on! Yes Again, not the right words, but the right problem. The single p; /archives//html/RFI/2004-09/msg00058.html (7,745 bytes)
95. Re: [RFI] BBC Concerns over BPL Interference to SW Broadcasting (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 14 Sep 2004 12:11:34 -0500; The DRM folks (Digital Radio Mondiale) organized a fine workshop at the spring international meeting of the AES (Audio Engineering Society) this spring. I attended the workshop and asked the broadcas; /archives//html/RFI/2004-09/msg00079.html (7,835 bytes)
96. Re: [RFI] DirecTV TVI Issue (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 21 Sep 2004 17:57:23 -0500; I would put my first money on 1) common mode on the RG-6 2) the TV set and connections to it 3) Pin 1 problems in a home theater setup Both could probably be fixed with the RIGHT ferrite choke. Consi; /archives//html/RFI/2004-09/msg00093.html (8,365 bytes)
97. Re: [RFI] DirecTV TVI Issue (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 21 Sep 2004 18:06:55 -0500; Agreed on all counts. But don't rule out the need for ferrite chokes on those connections to solve pin 1 problems. :) Jim Brown K9YC _______________________________________________ RFI mailing list R; /archives//html/RFI/2004-09/msg00095.html (7,071 bytes)
98. Re: [RFI] 160 Meter Interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 06 Oct 2004 09:09:41 -0500; Yes. 10BaseT traffic on an ethernet cable will radiate strong carriers throughout the spectrum. Some I have identified are around 14,030, 21,052, and 28,014. There are also carriers on the low end of; /archives//html/RFI/2004-10/msg00012.html (10,374 bytes)
99. Re: Re: [RFI] 160 Meter Interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 06 Oct 2004 11:05:38 -0500; Now that you mention it, you remind me of related set of noise sources that I've found to be particularly nasty. They are the battery chargers for powered drills and screwdrivers. The noise they prod; /archives//html/RFI/2004-10/msg00017.html (9,204 bytes)
100. Re: Re: [RFI] 160 Meter Interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 06 Oct 2004 11:09:05 -0500; Sure you have -- they just aren't Yagi's. Look at any directional AM broadcast antenna array, or google on K9DX. I'd love to see photos of W8JI's farm. I'm sure others could cite some good examples.; /archives//html/RFI/2004-10/msg00018.html (8,901 bytes)

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