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61. Re: [RFI] HF DF Antenna recommendations (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 20 Jan 2011 16:21:49 -0800; I have had good luck using my homebrew shielded loop for hunting down RFI on the low bands. The construction article from National Contest Journal is at: http://www.n6rk.com/loopantennas/NCJ_loop_an; /archives//html/RFI/2011-01/msg00172.html (8,834 bytes)
62. Re: [RFI] CHECK your grounds. (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 26 Jan 2011 18:20:10 -0800; I don't see why a GFCI circuit should need a green wire to work. It should be able to detect an imbalance between the neutral and phase currents independently of what is going on with ground. Rick N6; /archives//html/RFI/2011-01/msg00220.html (8,288 bytes)
63. Re: [RFI] Across-the-bay line noise from 17 miles away (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 01 Feb 2011 09:28:15 -0800; The problem here is the salt water path. I have found from driving around that power line noise travels a long way when over high conductivity ground, so that even getting miles away from the nearest; /archives//html/RFI/2011-02/msg00003.html (7,300 bytes)
64. Re: Topband: 160m & 80m RFI issues requesting ideas for ANC4 sense antenna to cancell out local noise (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Sun, 1 Nov 2015 05:45:58 -0800; I have an intermittent RFI issue that comes from a subdivision about a 1/4 mile away. To combat the noise I have been trying to use my ANC4 and I built a sense antenna out KD8NNU Connect the horizont; /archives//html/RFI/2015-11/msg00001.html (8,124 bytes)
65. Re: Topband: 160m & 80m RFI issues requesting ideas for ANC4 sense antenna to cancell out local noise (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Sun, 1 Nov 2015 07:55:06 -0800; I have tried this idea also but again not enough gain on those antennas. The vertical has s9 noise the others are 1/2 that level same as the KD8NNU If you are OK with vertical polarization, the simpl; /archives//html/RFI/2015-11/msg00003.html (9,465 bytes)
66. Re: [TowerTalk] Fair-Rite and Tariffs (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 15 Jul 2019 17:25:40 -0700; Are the toroids from Arrow marked "Made in Netherlands" or "Made in China". If the latter, I don't understand why they are exempt from tariffs just because they were "laundered" through the Netherlan; /archives//html/RFI/2019-07/msg00042.html (9,282 bytes)
67. [RFI] Powerline noise question (score: 1): Author: Richard Karlquist <richard@karlquist.com>; Date: Thu, 29 Dec 2022 19:15:32 -0800; I have a powerline noise coming from about 2 miles away, which is nevertheless quite strong at my QTH. Here are the symptoms: 1. A 120 Hz noise burst at regular intervals, about 0.9 seconds apart. 2.; /archives//html/RFI/2022-12/msg00184.html (7,650 bytes)
68. Re: [RFI] Powerline noise question (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Fri, 30 Dec 2022 12:25:47 -0800; Thanks Frank. You got me unstuck. I have ordered the DX Engineering Kits and the PL330 receiver. 73 Rick N6RK I recently built a WB8DSB man portable flag antenna (March 2021 QST) for RFI geolocation,; /archives//html/RFI/2022-12/msg00202.html (10,409 bytes)
69. Re: [RFI] Powerline noise question (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Fri, 30 Dec 2022 20:36:31 -0800; I am going to start with the preamp kit DXE sells to go with the flag kit. This particular noise source is extremely strong so I am optimistic that it will be sufficient. I can add the preamp that ca; /archives//html/RFI/2022-12/msg00217.html (11,775 bytes)
70. Re: [RFI] Powerline noise question (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Sat, 31 Dec 2022 13:49:50 -0800; I have attached an mp3 of the noise to my reply. I hope it propagates to Don, at least. 73 Rick N6RK how a conventional Xenon tube flash circuit works in photography. Can you upload a recording of y; /archives//html/RFI/2022-12/msg00240.html (10,153 bytes)
71. Re: [RFI] Powerline noise question (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 2 Jan 2023 11:35:43 -0800; Thanks for the help. As luck would have it, right now we seem to be in monsoon season. Rain every day for the next 2 weeks. It will give me time to build the DXE version of your antenna. I did spend; /archives//html/RFI/2023-01/msg00005.html (12,786 bytes)
72. Re: [RFI] MN8CX cores availability? (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Fri, 14 Jun 2024 13:45:34 -0700; Google reveals this is a "Power Ferrite <1 MHz" made by National Magnetics Group in PA. Never heard of them. It is a MnZn matl with u-3100. Probably not relevant for RFI suppression. Rick N6RK I'm no; /archives//html/RFI/2024-06/msg00032.html (7,947 bytes)

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