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41. Re: [RFI] I wish this guy had interviewed Ed Hare also... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 9 Jan 2004 11:42:05 -0500; Ed, Wasn't that 15 watts from a MOBILE antenna on 75 meters at 1/2 mile distance? I seem to recall reading something like that. 73, Tom W8JI The AMRAD filing documented interference to a HomePlug BPL; /archives//html/RFI/2004-01/msg00026.html (12,536 bytes)
42. Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 2 Feb 2004 05:35:18 -0500; Sounds like a lot to me also. I can make receiving CM choke systems that are over 40dB at one frequency range, but I doubt anyone can do that over wide bandwidths without a pi-section and isolated g; /archives//html/RFI/2004-02/msg00001.html (8,751 bytes)
43. Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 2 Feb 2004 06:02:07 -0500; By the way, if the common mode source and load impedances are a fraction of an ohm it is easy to obtain -50dB. If the common mode source and load impedances (which have nothing much to do with line; /archives//html/RFI/2004-02/msg00002.html (7,349 bytes)
44. Re: [RFI] Experience with RF-INQUIRY Hi-Q Chokes? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 2 Feb 2004 09:33:07 -0500; of Standard schmandard. People can measure things like this any way they like. I use a 50 ohm network analyzer that has a 50 ohm source and load, but some CE tests or "do it yourself" tests use othe; /archives//html/RFI/2004-02/msg00005.html (9,517 bytes)
45. Re: [RFI] My power line noise problems, revisited (Warning, thisislong!) (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 5 Feb 2004 20:14:46 -0500; by stranded stuff If he told you that, then he is exaggerating the problem a great deal. First of all, it would almost take a sledge hammer and crowbar to knock a strand "loose" from the wire bundle; /archives//html/RFI/2004-02/msg00015.html (11,121 bytes)
46. Re: [RFI] My power line noise problems, revisited (Warning, thisislong!) No... (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 5 Feb 2004 23:33:39 -0500; I think we are still talking about the first post. I think a logical first step would be to locate the problems, since the utility seems to be trying, and see if they can fix the problems. What that; /archives//html/RFI/2004-02/msg00022.html (8,617 bytes)
47. Re: [RFI] Whacking poles with giant hammers (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 7 Feb 2004 17:40:00 -0500; Probably? If we want to tell people not to tap poles, let's at least keep it factual. There are enough urban legends already! The real reason NOT to whack poles is it isn't your pole. I did consulti; /archives//html/RFI/2004-02/msg00049.html (8,184 bytes)
48. Re: [RFI] My power line noise problems, revisited (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 7 Feb 2004 18:02:15 -0500; John, there were always three primary causes of noise we found that affected frequencies up to 100MHz. 1.) The most common were slack spans where a wire hangs loosly with belly or sag in the span, an; /archives//html/RFI/2004-02/msg00050.html (9,537 bytes)
49. Re: [RFI] 345kv transmission lines (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 11 Feb 2004 18:03:48 -0500; Yes. Very likely. In South Amherst Ohio my receiving was hindered by a 345kV line that was actually pretty quiet, and it was a mile away. In rainy weather, the noise was S9 on 160 and 80 on Beverage; /archives//html/RFI/2004-02/msg00062.html (7,121 bytes)
50. Re: [RFI] 345kv transmission lines (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 12 Feb 2004 11:18:49 -0500; I think that really all depends. I live about 5-6 miles from big power lines and two towns of about 7000 people. My dominant daytime noise on low bands comes from those towns. Other directions are no; /archives//html/RFI/2004-02/msg00067.html (8,111 bytes)
51. Re: [RFI] Help with broadcast interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 13 Feb 2004 05:04:30 -0500; broadcast Hi Will, It is VERY unlikely common mode chokes, especially just adding a few beads on the coax or some wires, will do anything at all. First the impedance of any beads is generally far to; /archives//html/RFI/2004-02/msg00071.html (9,346 bytes)
52. Re: [RFI] Help with broadcast interference (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 16 Feb 2004 05:52:41 -0500; Right here is the key: You can do that. Anything the meter reads is USELESS because the tower becomes the antenna, not the loop in the FSM. It, in effect, makes the FSM have a pretty large reasonably; /archives//html/RFI/2004-02/msg00099.html (8,673 bytes)
53. [RFI] Re: Topband: Local noise environment (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 16 Feb 2004 20:29:33 -0500; Hissy noises slightly modulated by 120Hz or multiples generally come from real high voltage power lines (Three phases can make 360Hz buzz). You get two noise peaks per AC cycle. That's because the ar; /archives//html/RFI/2004-02/msg00109.html (8,010 bytes)
54. Re: [RFI] Copper-plated steel strap for grounding? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 21 Feb 2004 14:30:27 -0500; Alan, I don't know why anyone would want to use copper braid for a ground connection anyway unless the connection had to be very flexible, since even clean shiny braiding compacted together with a c; /archives//html/RFI/2004-02/msg00122.html (7,602 bytes)
55. Re: [RFI] TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 6 Mar 2004 16:22:59 -0500; Hi Yuri, A highpass filter is almost worthless for doing anything. The problem is almost always common mode currents flowing between various wires. Small common mode chokes like you used are also alm; /archives//html/RFI/2004-03/msg00027.html (10,878 bytes)
56. Fw: [RFI] TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 6 Mar 2004 19:33:19 -0500; careful This is a very good point, but most amps handle low value capacitors very well. By low value I mean .01uF or so. As far as I know they all have good feedback circuits and remain stable. It u; /archives//html/RFI/2004-03/msg00029.html (7,536 bytes)
57. Re: [RFI] TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 6 Mar 2004 19:34:17 -0500; Especially since many come with a equipment damage warranty! 73, Tom W8JI _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/RFI/2004-03/msg00030.html (8,175 bytes)
58. Re: [RFI] TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 7 Mar 2004 05:19:40 -0500; MCM Electronics and others sell them for as little as ten or twenty dollars 73, Tom W8JI -- Original Message -- From: "W0UN -- John Brosnahan" <shr@swtexas.net> To: <rfi@contesting.com> Sent: Saturda; /archives//html/RFI/2004-03/msg00033.html (9,962 bytes)
59. Re: [RFI] TVI (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 7 Mar 2004 11:58:36 -0500; Ian is right. There really should be more articles written in very simple plain terms explaining all this. 73, Tom W8JI _______________________________________________ RFI mailing list RFI@contesting; /archives//html/RFI/2004-03/msg00037.html (8,637 bytes)
60. Re: [RFI] KW Amp on second floor (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 12 Mar 2004 06:00:53 -0500; barefoot). The idea you need an "RF ground" on equipment is largely a myth brought about because people insist on feeding antennas incorrectly. If you have a reasonably proper antenna installation t; /archives//html/RFI/2004-03/msg00059.html (8,329 bytes)

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