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Total 1945 documents matching your query.

81. Re: [RFI] Blackberry interference with conference room audio systems (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 21 Mar 2005 12:32:24 -0600
I strongly agree Eddie. I have done considerable research in this area, all of it on my own nickel. That's part of my investment in my business. I've also published much of it, making available to ha
/archives//html/RFI/2005-03/msg00051.html (9,182 bytes)

82. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 22 Mar 2005 18:47:03 -0600
A good commercial line filter at the generator is probably be a good idea. Not all are created equal, so study the specs carefully. You want to ground the filter to the generator with very short lead
/archives//html/RFI/2005-03/msg00063.html (7,563 bytes)

83. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 08:49:25 -0600
While balancing the load between the legs is a good thing, especially in 120/240V systems, I doubt that it has much, if anything, to do with RFI. Jim Brown K9YC ______________________________________
/archives//html/RFI/2005-03/msg00066.html (7,354 bytes)

84. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 09:40:44 -0600
Yes Good. The ground should probably NOT have a toroid on it. Do you have my Power/Grounding white paper? If not, grab it off my website. There must be ONE, AND ONLY ONE, bond between neutral and gro
/archives//html/RFI/2005-03/msg00070.html (11,391 bytes)

85. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 10:18:27 -0600
"Short The word "probably" in my reply is based on the potential for a conflict between safety grounding and RFI suppression. You MUST bond all grounds within an installation for safety, but these co
/archives//html/RFI/2005-03/msg00073.html (10,221 bytes)

86. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 11:07:53 -0600
What magnetics are being saturated, and how? If all the currentcarrying conductors are going through the ferrite choke, the net field is limited to the common-mode current, which ought to be the nois
/archives//html/RFI/2005-03/msg00076.html (9,004 bytes)

87. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 12:06:13 -0600
Immediately adjacent to the service panel would be my choice. And following W8JI's advice, I would try to route the antennas through that common point and bond them (and their protection devices) the
/archives//html/RFI/2005-03/msg00078.html (9,894 bytes)

88. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 13:04:48 -0600
Sorry, brain cramp. I had forgotten we were talking about 120/240 as opposed to 120. Yes, both phases and the neutral need to go through the choke if the resultant field is to be small. Jim _________
/archives//html/RFI/2005-03/msg00080.html (8,826 bytes)

89. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 23 Mar 2005 17:43:31 -0600
The #31 material is relatively new. It is available in some sizes and configurations, but not all. The parts that W4EF and I have tested are experimental parts, and not in the catalog yet. In the Fai
/archives//html/RFI/2005-03/msg00087.html (9,535 bytes)

90. Re: [RFI] Honda Generator RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 24 Mar 2005 08:49:22 -0600
See my email from yesterday on this, Mike, when I ran through what could happen with impedance added to the ground. The issue is lightning protection, and the impedance that gets you common mode nois
/archives//html/RFI/2005-03/msg00095.html (9,609 bytes)

91. Re: [RFI] Lutron Eco-10 Fluorescent dimming ballast? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 14 Apr 2005 14:42:05 -0500
Several thoughts. 1) Part 18 is a joke for emissions. 2) Electronic dimmers work by chopping at some frequency at roughly 40-60 kHz, and I would expect them to be dogs for HF RFI. Expect lots of harm
/archives//html/RFI/2005-04/msg00009.html (8,751 bytes)

92. Re: [RFI] RFI and Hybrid vehicles - What are MFRs afraid of ? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 05 May 2005 08:23:49 -0500
hybrid Several thoughts. 1. On what legal grounds do they have the right to do so? You bought it, it's yours. 2. If their warranty forbids it without having disclosed that prior to sale, it seems to
/archives//html/RFI/2005-05/msg00004.html (8,105 bytes)

93. [TowerTalk] Cellular Base Station Power Levels (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 12 May 2005 10:40:30 -0500
For an "RFI for audio guys" applications note I am writing, I would like to know the approximate transmit power levels for cellular base stations. I'm guessing around 100w ERP on peaks? Jim Brown K9Y
/archives//html/RFI/2005-05/msg00024.html (6,855 bytes)

94. Re: [RFI] RFI with Dish Network (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 22 May 2005 16:38:46 -0500
It is most likely common mode on the coax, in which case the RIGHT ferrite choke will work. Single ordinary snap-ons won't make a dent in it. They are designed for VHF, but you can turn them into HF
/archives//html/RFI/2005-05/msg00029.html (7,149 bytes)

95. Re: [RFI] RFI From Wireless Internet Radio (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 06 Jul 2005 12:24:16 -0500
I suspect that at least some of the trash may be common mode radiation from the Ethernet cables that connect it to the rest of your system, or to the DSL or cable modem, or both. There is an applicat
/archives//html/RFI/2005-07/msg00001.html (8,049 bytes)

96. Re: [RFI] RFI From Wireless Internet Radio (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 08 Jul 2005 09:30:24 -0500
it, Your description reinforces my suspicions that common mode radiation from the Ethernet cable is likely a major component of the problem. The trash is generated at both ends of the cable. Thus, th
/archives//html/RFI/2005-07/msg00003.html (8,530 bytes)

97. [RFI] Fwd: Three One-Day Advanced EMC Public Seminars offered byHenry Ott Consultants (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 14 Jul 2005 09:53:06 -0500
I just received this announcement of Henry Ott's fall public seminars. I attended last year's version, and enjoyed it immensely. Mr. Ott teaches in a clear and no-nonsense manner that is both rigorou
/archives//html/RFI/2005-07/msg00017.html (7,929 bytes)

98. Re: [RFI] Fwd: Three One-Day Advanced EMC Public Seminars offeredby Henry Ott Consultants (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 15 Jul 2005 09:25:58 -0500
And of the 1988 second edition that is the bible of everyone I know who can read and write EMC. An excellent text, and my favorite reference on EMC. BTW, Henry is WA2IRQ. Jim K9YC ___________________
/archives//html/RFI/2005-07/msg00019.html (7,503 bytes)

99. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jul 2005 21:34:06 -0500
this. 1. I am SURE that this IS Ethernet trash. 2. I believe it is 10BaseT traffic, which can occur on a 100BaseT connection if there are 10BaseT cards. Many cable modem and DSL modem outputs are 10B
/archives//html/RFI/2005-07/msg00034.html (9,502 bytes)

100. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jul 2005 23:51:04 -0500
In general, that will only work for one source at a time, because it nulls a specific direction and phase offset. Now, since each source is on its own frequency, if you have the patience to tweak eac
/archives//html/RFI/2005-07/msg00039.html (8,337 bytes)

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