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References: [ +from:ingraham.ma.ultranet@rcn.com: 94 ]

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41. Re: [RFI] DSL Filter Update (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Sat, 7 Mar 2009 18:41:29 -0500; The source/load impedance do indeed affect the shape. In the vicinity of cutoff it changes the Q and you can get peaking or very gradual rolloff with the wrong impedance. And the stopband attenuatio; /archives//html/RFI/2009-03/msg00012.html (7,576 bytes)
42. Re: [RFI] Is a Ground-Shortening Switch Better? (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Thu, 12 Mar 2009 22:14:59 -0400; Forgetting to throw it before the storm comes! The best place for a switch (or physical disconnect) is before the feedline enters your shack, with the shortest possible connection to ground. Which m; /archives//html/RFI/2009-03/msg00031.html (7,676 bytes)
43. Re: [RFI] Fwd: EMC Seminar by Henry Ott Consultants, June 2-3, 2009 in New Jersey (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Tue, 24 Mar 2009 16:57:53 -0400; For those who may not know already, Henry Ott's website is http://www.hottconsultants.com/ , and it currently has the NJ seminar highlighted on the main page. Details are at http://www.hottconsultant; /archives//html/RFI/2009-03/msg00062.html (7,664 bytes)
44. Re: [RFI] Strange signal on 30M (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Thu, 2 Apr 2009 21:16:36 -0400; I haven't heard this ... but I saw some notes on other email lists over the last couple of days about a bunch of strange new signals popping up here and there, and the concensus seems to be that they; /archives//html/RFI/2009-04/msg00003.html (7,746 bytes)
45. Re: [RFI] Strange signal on 30M (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Fri, 3 Apr 2009 10:41:03 -0400; I guess my note could be interpreted either way. What I meant (and what I had read) was that these could be jamming signals, coming from Cuba. Someone said the new signals he heard on 40m sounded jus; /archives//html/RFI/2009-04/msg00006.html (7,862 bytes)
46. Re: [RFI] Coaxial Choke (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Wed, 15 Apr 2009 11:08:05 -0400; I'm not sure if "out of date" is exactly right in this context (neither the coax nor the theory changed, did they?), but I believe you are right that air would coax chokes are inadequate for HF. OK; /archives//html/RFI/2009-04/msg00047.html (7,892 bytes)
47. Re: [RFI] Coaxial Choke (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Wed, 15 Apr 2009 15:08:40 -0400; I just wanted to echo what you said ... and pointing out that others whose opinions I respect have experienced the same thing, that the air-wound coax coil is pretty much ineffective at HF. Of cours; /archives//html/RFI/2009-04/msg00049.html (8,293 bytes)
48. [RFI] CFL RFI warning sticker (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Tue, 26 May 2009 13:56:17 -0400; A warning sticker that came inside the packaging for a CFL, recently purchased: This product complies with Part 18 of the FCC rules but may cause interference to radios, televisions, wireless telepho; /archives//html/RFI/2009-05/msg00036.html (7,314 bytes)
49. Re: [RFI] Anyone observed damage to the "guard wire grounds"? (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Fri, 19 Jun 2009 18:50:19 -0400; Back when I was a kid and used to get around by foot or bike, I used to pay a bit of attention to the utility poles (often without understanding everything about them). I frequently saw the ground w; /archives//html/RFI/2009-06/msg00049.html (8,055 bytes)
50. Re: [RFI] Recommended RFI-Proof Speakers (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Fri, 26 Jun 2009 19:35:59 -0400; One source for what are advertised as RFI-resistance computer speakers, is West Mountain Radio: http://www.westmountainradio.com/COMspkr.htm Andy _______________________________________________ RFI m; /archives//html/RFI/2009-06/msg00062.html (7,457 bytes)
51. Re: [RFI] TVI filters (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 29 Jun 2009 12:33:02 -0400; What frequencies do you want to filter out?? And what problem are you trying to solve? Just curious, that's all.... Andy _______________________________________________ RFI mailing list RFI@contesti; /archives//html/RFI/2009-06/msg00065.html (6,681 bytes)
52. Re: [RFI] TVI filters (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 29 Jun 2009 14:53:42 -0400; Interesting, since the Comcast techs up here regularly replace proper F-connector cables, with the non-threaded push-on variety to make it easier, at least for the cable box to TV connection (jumper; /archives//html/RFI/2009-06/msg00069.html (7,818 bytes)
53. Re: [RFI] TVI filters (score: 1): Author: "Andy" <ingraham.ma.ultranet@rcn.com>; Date: Mon, 29 Jun 2009 16:25:44 -0400; a This was a few years ago. The tech removed the cable with the screw-on connectors and handed us the one with the push-on connectors, saying they were giving them to all the customers. It was an in; /archives//html/RFI/2009-06/msg00072.html (8,841 bytes)
54. Re: [RFI] WAY OT (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Mon, 18 Jan 2010 14:09:01 -0500; I wonder if anyone has tried something like a half wave whip, which wouldn't depend so much on a groundplane. You'd have to cut your own, I think (maybe take a 5/8 whip and shorten it?), and make a n; /archives//html/RFI/2010-01/msg00065.html (8,043 bytes)
55. Re: [RFI] Wal-Mart to Put Radio Tags on Clothes - WSJ.com (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Fri, 23 Jul 2010 22:56:02 -0400; I'm not very knowledgeable about RFID tags, which is what I think these are. But my understanding is that RFID devices have no internal power; they get their power from the nearby scanner, and otherw; /archives//html/RFI/2010-07/msg00022.html (8,085 bytes)
56. Re: [RFI] Rectified 120Hz RFI? (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Wed, 4 Aug 2010 13:45:48 -0400; Just thinking, there are many possibilities for what might cause it to be 120 Hz instead of 60 Hz. One being something gone wrong in a full wave rectifier. Jim's suggestion of arcing on both excursio; /archives//html/RFI/2010-08/msg00012.html (7,131 bytes)
57. Re: [RFI] Rectified 120Hz RFI? (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Wed, 4 Aug 2010 14:43:02 -0400; Yes. Used for things other than dimmers too. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2010-08/msg00014.html (7,248 bytes)
58. Re: [RFI] Garage door openers (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Mon, 23 Aug 2010 14:07:15 -0400; I'll bet there are many other things done that night and almost every other time the place was visited. Light switches turned on, and off. Doors opened, letting in air. Motion detectors. All these t; /archives//html/RFI/2010-08/msg00063.html (7,949 bytes)
59. Re: [RFI] Ferrite bead disintegration (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Tue, 24 Aug 2010 19:58:59 -0400; I'm confused because you also said it spent time in the grass. Unless it was coiled up in both places, disconnected from anything, lightning is at least a possibility. Andy _________________________; /archives//html/RFI/2010-08/msg00068.html (7,987 bytes)
60. Re: [RFI] Ferrite bead disintegration (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Wed, 25 Aug 2010 08:58:01 -0400; I am too. I don't know much about the durability of ferrites, but I am envisioning yours as rather thin and possibly delicate, and a year or two in a northern USA winter might do a number on them. T; /archives//html/RFI/2010-08/msg00071.html (9,108 bytes)

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