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61. RE: [RFI] TVI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 12 Jan 2005 22:07:14 -0600
5931003801 In this part number, 59 signifies a toroid, 31 the material, 003801 signifies the toroid that is 2.4" O.D. x 1.4" I.D. x 0.5" L. I concur with those who suggested (on another list) going t
/archives//html/RFI/2005-01/msg00024.html (7,306 bytes)

62. Re: [RFI] Washing machine RFI question (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 18 Jan 2005 22:05:31 -0600
The good news is that if it trashes the TV, it most likely violates Part 15. That should give you and the other guy with the problem a bigger hammer to get it fixed. Jim Brown K9YC __________________
/archives//html/RFI/2005-01/msg00033.html (7,531 bytes)

63. [RFI] High Power Wi-Fi (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 21 Jan 2005 21:22:20 -0600
I just returned from a computer store where I saw a crop of "high power" Wi-Fi routers and PCCard interfaces. The routers claimed 200 mW and has removable antennas (SMA's, I think). The PCCards were
/archives//html/RFI/2005-01/msg00040.html (6,803 bytes)

64. Re: [RFI] Ethernet RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 22 Jan 2005 19:31:15 -0600
See this link to a new applications note on my website about how to use ferrite chokes to kill stuff like this. This one is geared toward keeping RF out of audio, but the physics is exactly the same.
/archives//html/RFI/2005-01/msg00047.html (9,335 bytes)

65. Re: [RFI] Ethernet RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 22 Jan 2005 21:40:59 -0600
You'd better go for a paycheck loan, Ford. :) You (and the tutorial) are absolutely correct that a twisted pair helps TREMENDOUSLY in killing DIFFERENTIAL mode coupling to/from the cable. And we have
/archives//html/RFI/2005-01/msg00053.html (8,268 bytes)

66. RE: [RFI] Ethernet RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 23 Jan 2005 15:15:19 -0600
Not only is correct wiring critical for EMC, it is also quite critical for performance as an Ethernet cable. Understand this basic concept. A CAT5 cable (or CATx, for that matter) consists of FOUR TW
/archives//html/RFI/2005-01/msg00064.html (9,514 bytes)

67. Re: RE: [RFI] Ethernet RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 23 Jan 2005 22:33:02 -0600
transmission test set" test by just eyeballing the RJ45s on each end and making sure the proper color code for the wires was followed. That is, assuming the cable is good quality. If your eyes were g
/archives//html/RFI/2005-01/msg00068.html (8,762 bytes)

68. RE: RE: [RFI] Ethernet RFI (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 24 Jan 2005 08:59:47 -0600
I don't consder myself an expert on this at all, but will offer these thoughts. 1) The shorter any wire is, the less likely it is to couple RF from your rig to the equipment, especially at HF. So fro
/archives//html/RFI/2005-01/msg00071.html (10,417 bytes)

69. Re: [RFI] Far Field, Near Field (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 25 Jan 2005 08:16:52 -0600
Agreed on all counts. Jim Brown K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-01/msg00076.html (6,946 bytes)

70. Re: [RFI] Ethernet RFI and connector wiring (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 31 Jan 2005 01:23:21 -0600
No surprise -- it's common mode radiation, NOT differential mode! Jim Brown K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailma
/archives//html/RFI/2005-01/msg00086.html (7,536 bytes)

71. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 04 Feb 2005 13:06:11 -0600
On Fri, 04 Feb 2005 10:30:31 -0800, digital-conjurers@adelphia.net wrote: Unlikely if you follow good engineering practice. 1) Get your power directly from the battery ( both positive and negative).
/archives//html/RFI/2005-02/msg00009.html (8,653 bytes)

72. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 04 Feb 2005 17:48:15 -0600
You're thinking resistance, not inductance or loop area. When you get the power via the closely paired cable (even better if it's twisted), you minimize the loop area of any issues with RF on that po
/archives//html/RFI/2005-02/msg00011.html (7,847 bytes)

73. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 04 Feb 2005 18:36:30 -0600
Because the question was about whether he would have problems with the on-board computers. The lower the impedance of the power connection at RF, the less likely that is to occur. If the only connect
/archives//html/RFI/2005-02/msg00013.html (7,607 bytes)

74. Re: [RFI] Whirlpool Duet Washing Machine RFI update (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 11 Feb 2005 13:33:44 -0600
But they still must comply with Part 15. I would insist that THEY do the work that it takes to do that. If there is resistance, I would tell them that your next call is to the FCC. Jim Brown K9YC ___
/archives//html/RFI/2005-02/msg00044.html (7,463 bytes)

75. Re: [RFI] Whirlpool Duet Washing Machine RFI update (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 12 Feb 2005 01:05:13 -0600
Yes, but I'm guessing that it may not conform to Part 15 emissions for Class B. FWIW, variable frequency drives are known to be problematic with audio systems, and it may be due to magnetic fields es
/archives//html/RFI/2005-02/msg00051.html (9,855 bytes)

76. Re: [RFI] rf and insulin pumps (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 13 Feb 2005 22:11:36 -0600
I would take a WAG (wild-assed guess) and say that it's on a VHF TV channel. My understanding is that medical devices have been there for some years. I know they had to do a mad scramble in the Dalla
/archives//html/RFI/2005-02/msg00064.html (7,273 bytes)

77. Re: [RFI] Visit from the power company (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 16 Feb 2005 17:07:29 -0600
Can't imagine why, other than Murphy's law. :) On the other hand, consider yourself lucky -- the new stuff may result in less noise if the old stuff was arcing! Jim Brown K9YC _______________________
/archives//html/RFI/2005-02/msg00074.html (7,047 bytes)

78. Re: [RFI] DSL surge protection (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 24 Feb 2005 13:33:03 -0600
I suggest that you consider the networking hardware as sacrificial --it's all cheap gear and from what you say, difficult to protect while still working well -- and pay more attention to damage to co
/archives//html/RFI/2005-02/msg00077.html (7,804 bytes)

79. Re: [RFI] FCC fines station for exceeding RF field strength limits(andother things) (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 27 Feb 2005 13:24:34 -0600
Yeah, but $25K doesn't even qualify as a slap on the wrist! Jim Brown _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/RFI/2005-02/msg00098.html (7,339 bytes)

80. Re: [RFI] super transformer dimmer (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 20 Mar 2005 18:34:06 -0600
You need to know a lot more about a filter than this to judge its effectiveness. Jim Brown K9YC Inductance 3.3 mH. _______________________________________________ RFI mailing list RFI@contesting.com
/archives//html/RFI/2005-03/msg00042.html (7,521 bytes)

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