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41. Re: [RFI] BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sat, 27 Mar 2004 13:55:25 -0600
Exactly. The comments I filed in June or July emphasized the disruption to ALL HF services. Ham radio was simply one of those I mentioned. Jim Brown K9YC _____________________________________________
/archives//html/RFI/2004-03/msg00149.html (8,130 bytes)

42. Re: [RFI] WSJ-BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Wed, 31 Mar 2004 08:52:25 -0600
This is a a common problem with the popular press. Their people are competent ONLY as "writers" and as reporters of events that their education has made them competent to understand. Few, if any, are
/archives//html/RFI/2004-03/msg00183.html (8,843 bytes)

43. Re: [RFI] WSJ-BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Wed, 31 Mar 2004 21:54:54 -0600
You know the wrong engineers for this sort of assignment. (or maybe the limitation is in your head). I'm one of the "right" kind. I'm an engineer, and I make my living by communicating technical conc
/archives//html/RFI/2004-03/msg00185.html (9,851 bytes)

44. Re: [RFI] WSJ-BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Thu, 01 Apr 2004 22:51:09 -0600
No insult taken or intended, Mike. But I have seen far too many companies who pigeonhole their engineers into the narrow boxes you describe. When they do, they hurt their companies by preventing comm
/archives//html/RFI/2004-04/msg00002.html (7,274 bytes)

45. [RFI] W4AN (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 05 Apr 2004 15:54:56 -0600
Because I was inactive on HF for most of the last 18 years, I didn't get to know Bill, and worked him only a few times since my return in a few contests. But because Bill was such an active supporter
/archives//html/RFI/2004-04/msg00022.html (7,079 bytes)

46. Re: [RFI] BPL a major topic at Upcoming UTC Annual Meeting (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 16 Apr 2004 16:18:56 -0500
Sounds like a plan. Perhaps our contest should include multipliers for portable and mobile rigs operating in the test areas. And the multiplier ought to offer MORE points for higher power. After 48 y
/archives//html/RFI/2004-04/msg00046.html (7,601 bytes)

47. RE: [RFI] BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sat, 17 Apr 2004 14:05:01 -0500
Some questions: 1. How many licensed hams are there within all of the BPL test sites? Have they been carefully selected to minimize the likelihood of interference occuring? 2. How many of them are ac
/archives//html/RFI/2004-04/msg00068.html (9,221 bytes)

48. RE: [RFI] More Thoughts on BPL (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Mon, 24 May 2004 08:22:12 -0500
There was an excellent (and frightening) piece on the NPR program "This American Life" this week that addressed the appointments of members to a science advisory panel on lead poisoning. I didn hear
/archives//html/RFI/2004-05/msg00157.html (9,111 bytes)

49. Re: [RFI] Ethernet, radio astronomy, and electric fences (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 28 May 2004 12:17:09 -0500
Is a significant component of the Ethernet stuff common mode? If so, it seems that common mode chokes should help, especially with MF and HF. These pictures strongly suggest that Ethernet may be a bi
/archives//html/RFI/2004-05/msg00186.html (7,648 bytes)

50. [RFI] Complex Impedance Measurement Instruments (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Thu, 03 Jun 2004 07:24:22 -0500
For some research I am doing into RFI elimination, I need to measure the complex impedance of chokes made using various ferrite cores. I'm specifically looking at reducing common mode current on audi
/archives//html/RFI/2004-06/msg00000.html (6,911 bytes)

51. [RFI] Linksys Routers, EMC, and Ferrite Chokes (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sun, 06 Jun 2004 12:36:56 -0500
I've been doing some research here in my office/ham shack and have learned some interesting things. I have two Linksys beasts in my office -- one of the BEFR wireless routers that is cited in the cla
/archives//html/RFI/2004-06/msg00004.html (8,356 bytes)

52. RE: [RFI] Linksys Routers, EMC, and Ferrite Chokes (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Sun, 06 Jun 2004 17:22:41 -0500
Don't know. Listen to it and tell us what you hear! In addition to my station receivers, I use a Kenwood TH-F6A (HT that also has a poor HF receiver) to probe around suspected sources and wiring. If
/archives//html/RFI/2004-06/msg00007.html (7,460 bytes)

53. Re: [RFI] TVI (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Tue, 08 Jun 2004 07:10:11 -0500
I suggest that 1) you give the TV a fighting chance by connecting it to a real antenna, connecting the antenna via coax and, if required, a proper balun. 2) If the lights dim in your home with key-do
/archives//html/RFI/2004-06/msg00014.html (9,012 bytes)

54. Re: [RFI] CAT 3 Cable? (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Thu, 17 Jun 2004 17:09:03 -0500
Twisted pair cable picks up far less differential mode RF than untwisted cable, and the higher the twist ratio, the better the rejection. Go straight to CAT5. You may still have problems with common
/archives//html/RFI/2004-06/msg00049.html (7,637 bytes)

55. Re: [RFI] CAT 3 Cable? (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Thu, 17 Jun 2004 22:43:51 -0500
My 6m SSB radio was getting into the landline in my wife's office. A 1" long Fair Rite #43 clamp-on took it right out. You might be surprised to learn that multiple turns around large ferrite cores y
/archives//html/RFI/2004-06/msg00057.html (8,871 bytes)

56. Re: [RFI] CAT 3 Cable? (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 18 Jun 2004 08:19:49 -0500
Before you make this statement, you should measure chokes built with some of these cores. I have done so, and in a disciplined way. In general, the resistive component of the core's permeability (wha
/archives//html/RFI/2004-06/msg00061.html (13,043 bytes)

57. Re: [RFI] CAT 3 Cable? (score: 1)
Author: "Jim Brown" <jimbrown.enteract@rcn.com>
Date: Fri, 18 Jun 2004 08:59:36 -0500
Yes, it does, because Tom's post is aimed at the mindless application of clamp-ons, and mine is aimed at a thoughtful engineering approach. My original post observed that 1) replacing the parallel wi
/archives//html/RFI/2004-06/msg00062.html (9,284 bytes)

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