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41. Re: [RFI] Solar Arrays, etc. (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 7 May 2007 09:15:47 -0700; I have been doing RF scouting in power line free zones. I noticed that whenever I get near "civilization" even of the off-grid variety, there is a big increase in RF noise, presumably from inverters,; /archives//html/RFI/2007-05/msg00002.html (8,215 bytes)
42. Re: [RFI] Noise in 2007 RHS-TV (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 14 May 2007 09:09:41 -0700; I rented a diesel flat bed truck once to move a tower. The diesel "ignition" noise was so gawdawful I couldn't even listen to the broadcast radio in the truck, even on FM! The noise is not impulsive; /archives//html/RFI/2007-05/msg00014.html (9,742 bytes)
43. Re: [RFI] Noise in 2007 RHS-TV (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 14 May 2007 10:23:53 -0700 (PDT); Of course there is no "ignition" in a diesel. However, the noise was definitely "throttle" related. It went way down when I lifted my foot off the accelerator pedal. I figure that when I put the hamm; /archives//html/RFI/2007-05/msg00017.html (8,706 bytes)
44. Re: [RFI] [TowerTalk] Testing & Comparing Compact Fluorescents? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 31 Oct 2007 14:24:48 -0800; I have found that the lamps themselves make very little noise. However, unless you go to the considerable trouble to get magnetic ballasts, the electronic ballasts are very RF noisy. I still have my; /archives//html/RFI/2007-10/msg00154.html (8,728 bytes)
45. Re: [RFI] powerline noise that seems to peak in frequency (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Sat, 08 Dec 2007 16:23:29 -0800; This is not usual at all, due to resonances in the power wires. It is surprising how sharp they are. Rick N6RK _______________________________________________ RFI mailing list RFI@contesting.com http; /archives//html/RFI/2007-12/msg00019.html (7,743 bytes)
46. Re: [RFI] powerline noise that seems to peak in frequency (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Sat, 08 Dec 2007 22:15:23 -0800; This should have read "This is not UNusual ..." _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2007-12/msg00021.html (8,609 bytes)
47. Re: [RFI] Computer RFI on 160 (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 29 Oct 2008 13:34:43 -0700 (PDT); Same here: I had an RFI problem with my own computer in my shack and installed a Corcom filter and it fixed the problem. It was also a homebrew whitebox computer with some junky power supply that cam; /archives//html/RFI/2008-10/msg00082.html (7,869 bytes)
48. Re: [RFI] HV Transmission Line (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 13 Oct 2009 13:39:31 -0700; I'm sure you'll get varied replies. I have a line 1 mile west of me that runs through a huge nature preserve. To the east is "civilization". It's always quieter aiming west than east for me. Others h; /archives//html/RFI/2009-10/msg00023.html (7,946 bytes)
49. Re: [RFI] Portable ~$50 AM/SW radio for dfing? (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 9 Nov 2009 11:59:14 -0800; I have a SR II and it is a FABULOUS radio. Having said that, if you just want to DF noise, the pocket sized Sangean radios from C Crane work very well for DF'ing and are a lot easier to carry around.; /archives//html/RFI/2009-11/msg00021.html (7,417 bytes)
50. Re: [RFI] flourescent light (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sun, 29 Nov 2009 19:31:44 -0800; Also, these streetlights tear up AM broadcast reception. I can completely eliminate the AM radio interference by simply orienting my radio so as to null it. It is a common misconception that because; /archives//html/RFI/2009-11/msg00049.html (8,893 bytes)
51. Re: [RFI] Another Plea For Help (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 8 Mar 2010 14:43:53 -0800; I had a streetlight that made terrible noise only when off. Quiet as a church mouse when on. I talked the county into wiring it on all the time. Rick N6RK ____________________________________________; /archives//html/RFI/2010-03/msg00010.html (8,913 bytes)
52. Re: [RFI] Another Plea For Help (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 8 Mar 2010 15:42:44 -0800; It was the light sensor. I had some cheap consumer light sensors that also put out a lot of RFI. This was different from the problem where the light keeps trying to start. Rick N6RK _________________; /archives//html/RFI/2010-03/msg00013.html (9,351 bytes)
53. Re: [RFI] Linksys Router Birdies (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 11 Mar 2010 17:29:47 -0800; I had trouble with my LAN cable wiping out the AM broadcast band. It probably would have screwed up ham bands too, except it was too far away from the ham antennas. I just applied ferrite toroids to; /archives//html/RFI/2010-03/msg00021.html (8,956 bytes)
54. Re: [RFI] Question from CO8LY (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 24 Mar 2010 10:33:01 -0700; The Drake filter is excellent. I could run 1500W on 10 meters and watch channel 2 on 54-60 MHz with zero QRM using a TV antenna spaced less than 1 meter away from my 10m Yagi. The Channel 2 transmitt; /archives//html/RFI/2010-03/msg00089.html (7,586 bytes)
55. Re: [RFI] Ultrasonic Line Noise Detectors (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 26 Apr 2010 18:38:24 -0700; The QST project reportedly works, but is far from an optimal design. The high gain (read narrow beamwidth) transducer recommended doesn't properly illuminate the very low f/d dish and the frequency d; /archives//html/RFI/2010-04/msg00055.html (8,399 bytes)
56. Re: [RFI] Ultrasonic Line Noise Detectors (Rick Karlquist) (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 28 Apr 2010 08:22:14 -0700; I threw together a "proof of concept" unit. Not ready for a construction article, which I don't currently have time to write. Key takeaways: 1. The transducer is very narrow band around 40 kHz. The t; /archives//html/RFI/2010-04/msg00057.html (8,862 bytes)
57. Re: [RFI] Does a power pole generating RFI always generate ultrasonics? (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 7 Jun 2010 16:03:08 -0700; Remember that sound, unlike RF, doesn't go through wood. You need to have line of sight to the ultrasonic noise. I also have a popping noise on a nearby pole, for whatever that is worth. Rick N6RK __; /archives//html/RFI/2010-06/msg00010.html (9,265 bytes)
58. Re: [RFI] Does a power pole generating RFI always generate ultrasonics? (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 7 Jun 2010 17:53:06 -0700; I have an HV line 1 mile west of me and a city 1 mi east of me. It is usually much quieter to aim the beam to the west than the east. So it seems that the line is not a problem. Rick N6RK ___________; /archives//html/RFI/2010-06/msg00013.html (7,995 bytes)
59. Re: [RFI] Ladder Line and RFI/Noise (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 19 Oct 2010 11:44:05 -0700; I have 850 feet of 450 ohm open wire line. If I disconnect the antenna, the noise drops way down, indicating that the line is not picking up much noise on its own. It would be unlikely that a noise s; /archives//html/RFI/2010-10/msg00058.html (9,033 bytes)
60. Re: [RFI] Ladder Line and RFI/Noise (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 19 Oct 2010 11:48:25 -0700; Then there is always the exception to the rule: I use common mode chokes at both ends of my open wire line. It never occurred to me to build it any other way. Maybe that is why I don't have any troub; /archives//html/RFI/2010-10/msg00059.html (8,840 bytes)

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