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61. Re: [RFI] [CQ-Contest] 40m to 20m interference (score: 1): Author: donovanf@starpower.net; Date: Wed, 22 Jan 2020 23:30:42 -0500 (EST); Hi Bill, You're experience is fairly common. When a transmitter operates in proximity to electronic devices, the strong RF field often causes those devices to behave in a non-linear fashion to: - gen; /archives//html/RFI/2020-01/msg00127.html (9,895 bytes)
62. Re: [RFI] How to proceed? (score: 1): Author: donovanf@starpower.net; Date: Mon, 27 Jan 2020 00:01:56 -0500 (EST); Hi Pete, Many portable receivers have useful directivity on 160 meters and above. Otherwise you could purchase or fabricate a simple portable "magnetic" loop directive receiving antenna such as: www.; /archives//html/RFI/2020-01/msg00144.html (8,692 bytes)
63. Re: [RFI] AM Broadcast Intermod? (score: 1): Author: donovanf@starpower.net; Date: Tue, 28 Jan 2020 13:27:42 -0500 (EST); Hi Pete, The primary rule when tracking down any RFI or intermod source is to turn off all power in your home and all UPSs. This includes UPSs that are easily forgotten such those integrated into tel; /archives//html/RFI/2020-01/msg00159.html (8,890 bytes)
64. Re: [RFI] [Amps] Amp causing RFI (score: 1): Author: donovanf@starpower.net; Date: Wed, 5 Feb 2020 00:09:18 -0500 (EST); DANGER DANGER DANGER Mark's advice should not be copied by anyone who respects their lives and the lives of anyone living in or visiting their shack or home. The ground wire in AC wiring provides a l; /archives//html/RFI/2020-02/msg00019.html (11,098 bytes)
65. Re: [RFI] [Amps] Amp causing RFI (score: 1): Author: donovanf@starpower.net; Date: Wed, 5 Feb 2020 00:59:37 -0500 (EST); Hi Mark, You misunderstand how short circuits to ground trip a circuit breaker. Lets examine just a simple case. Lets suppose you cut the ground wire in the AC power cord connecting your DC power sup; /archives//html/RFI/2020-02/msg00022.html (12,687 bytes)
66. Re: [RFI] Xfinity Router RFI (Xfinity router name XB3) (score: 1): Author: donovanf@starpower.net; Date: Thu, 13 Feb 2020 13:44:58 -0500 (EST); Don, Do you intend to keep an untuned loop in your bag of tricks? It would seem that its very sharp null offers unique advantages. 73 Frank W3LPL -- Original Message -- Hi Jim Thanks, and I thought a; /archives//html/RFI/2020-02/msg00074.html (18,299 bytes)
67. Re: [RFI] WD8DSB Portable Terminated Flag Demonstration Video (score: 1): Author: donovanf@starpower.net; Date: Thu, 20 Feb 2020 19:19:02 -0500 (EST); Excellent video Don! 73 Frank W3LPL -- Original Message -- I made a quick video this afternoon showing my portable terminated flag versus one of my tuned loops on 80 meters. Here is the link to the v; /archives//html/RFI/2020-02/msg00105.html (8,084 bytes)
68. Re: [RFI] How to get located quickly... (score: 1): Author: donovanf@starpower.net; Date: Sat, 18 Apr 2020 13:45:39 -0400 (EDT); Hi Dave, That's just one of countless thousands of such stories since the advent of the space age. RFI affects both civil and national security satellite services. The rapid RFI geolocation capabilit; /archives//html/RFI/2020-04/msg00060.html (7,847 bytes)
69. Re: [RFI] RFI Solved After 2 Years (score: 1): Author: donovanf@starpower.net; Date: Fri, 10 Jul 2020 01:14:39 -0400 (EDT); Hi Frank, Are the light dimmers for incandescent lamps or LED lamps, or...? I have a pair of bathroom mirrors with the borders backlit by hundreds of tiny dimmable LED lamps. The RFI is incredibly st; /archives//html/RFI/2020-07/msg00008.html (8,830 bytes)
70. Re: [RFI] RFI Solved After 2 Years (score: 1): Author: donovanf@starpower.net; Date: Fri, 10 Jul 2020 13:19:01 -0400 (EDT); Hi Jim, The power supply is located in the mirror frame. But its not worth the effort to fix it since I never operate while shaving! tks 73 Frank W3LPL -- Original Message -- From: "Jim McCook" <w6ya; /archives//html/RFI/2020-07/msg00012.html (9,495 bytes)
71. Re: [RFI] solar farm ordinance (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Tue, 15 Feb 2022 16:48:19 -0500 (EST); Hi Gordon, Howard County MD has specific zoning requirements for many different types of commercial and homeowner solar collector installations. I assume you're focused of commercial ground-mount sol; /archives//html/RFI/2022-02/msg00062.html (8,602 bytes)
72. Re: [RFI] solar farm ordinance (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Tue, 15 Feb 2022 16:35:50 -0500 (EST); Hi Jamie. Howard County MD has specific zoning requirements for many different types of commercial and homeowner solar collector installations. I assume you're focused of commercial ground-mount sola; /archives//html/RFI/2022-02/msg00063.html (8,423 bytes)
73. Re: [RFI] 12v 5A linear power supply? (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Wed, 9 Nov 2022 11:15:32 -0500 (EST); Hi Mike, Can you share the specific part number or other other identifying details of that very noisy (wall wart?) power supply? 73 Frank W3LPL That power supply Eric is looking for is to replace one; /archives//html/RFI/2022-11/msg00006.html (9,430 bytes)
74. Re: Topband: [RFI] Powerline noise question (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Thu, 29 Dec 2022 22:53:49 -0500 (EST); Hi Rick, I recently built a WB8DSB man portable flag antenna (March 2021 QST) for RFI geolocation, its performance far exceeds my expectations. Its narrow deep null quickly, easily and definitively l; /archives//html/RFI/2022-12/msg00187.html (8,802 bytes)
75. Re: [RFI] Powerline noise question (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Thu, 29 Dec 2022 23:23:21 -0500 (EST); Richard, I forgot to mention that electric fence RFI typically has a definitive repetition cycle similar to what you described and often goes away during rain. 73 Frank W3LPL Hi Rick, Sorry that my l; /archives//html/RFI/2022-12/msg00189.html (10,398 bytes)
76. Re: [RFI] Powerline noise question (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Fri, 30 Dec 2022 20:08:01 -0500 (EST); Rick, You'll be very pleased with the performance of the WB8DSB RFI hunting flag antenna. Don't forget to need lots of preamp gain. The WB8DSB flag is about 60 dB down from a dipole on 160 meters. 40; /archives//html/RFI/2022-12/msg00209.html (11,559 bytes)
77. Re: [RFI] Powerline noise question (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Sat, 31 Dec 2022 18:56:01 -0500 (EST); Hi Rick, I never attempt to guess based on the sound of the RFI, I always use geolocation techniques to discover the location of the source. Good luck! 73 Frank W3LPL I have attached an mp3 of the no; /archives//html/RFI/2022-12/msg00243.html (10,633 bytes)
78. Re: [RFI] Please comment this picture (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Tue, 3 Jan 2023 17:21:13 -0500 (EST); Hi Wes, The justification for 5K or greater common mode choke resistance is to limit ferrite core heating for transmitting applications. Although it can be done, IMHO there's no imperative for 5K cho; /archives//html/RFI/2023-01/msg00016.html (10,521 bytes)
79. Re: Topband: The 160 meter spur (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Fri, 6 Jan 2023 18:36:26 -0500 (EST); Hi Rick I've attached a photo of the four 237 foot towers used by 1660 kHz WWRU and the four 237 foot towers used by the 1380 kHz WKDM. The two directive antenna arrays share the same site at 350 Pat; /archives//html/RFI/2023-01/msg00039.html (9,287 bytes)
80. Re: [RFI] 160m spur (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Mon, 9 Jan 2023 19:40:34 -0500 (EST); Hi Bob, Do you recall when you -- or anyone else -- first noticed the WKDM/WWRU spurious emissions on 1940 kHz? The FCC rule regarding emissions more then 75 kHz from an AM broadcasters assigned freq; /archives//html/RFI/2023-01/msg00051.html (8,219 bytes)

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