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References: [ +from:richard@karlquist.com: 77 ]

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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)

73. Re: [RFI] Power Line Noise - UPDATE 12/31/24 (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Sun, 5 Jan 2025 08:19:36 -0800
Additionally along this line: Sometimes .pdf's are copy protected or edit protected. But they are never AFAIK protected from printing. If you "print" one of these files in "print to file" mode, the c
/archives//html/RFI/2025-01/msg00024.html (9,303 bytes)

74. Re: [RFI] Mitsubishi HVAC RFI (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Fri, 7 Feb 2025 21:13:14 -0800
I have a Mitsubishi system right in my ham shack. Never had a bit of RFI from it. FWIW. Rick N6RK My next door neighbor, (who I get along with well), has a Mitsubishi unit, that is now causing lots o
/archives//html/RFI/2025-02/msg00013.html (7,618 bytes)

75. Re: [RFI] Generac Solar System RFI Update (score: 1)
Author: Richard Karlquist <richard@karlquist.com>
Date: Wed, 26 Mar 2025 11:06:57 -0700
I heard that Generac doesn't provide an economy running mode that conserves fuel the way that, for example, the Honda 2000i does. This info might be enough to fend off a future neighbor from buying G
/archives//html/RFI/2025-03/msg00009.html (9,440 bytes)

76. Re: [RFI] Base Power Company (score: 1)
Author: Richard Karlquist <richard@karlquist.com>
Date: Tue, 08 Jul 2025 13:17:21 -0700
In general, most SA's have a very high noise figure. And a built in whip is an inefficient antenna on 40 meters. So this "measurement" is probably fairly meaningless. To get a meaningful measurement,
/archives//html/RFI/2025-07/msg00010.html (8,608 bytes)

77. Re: [RFI] Base Power Company (score: 1)
Author: Richard Karlquist <richard@karlquist.com>
Date: Tue, 08 Jul 2025 16:52:45 -0700
For antenna measurements with a spectrum analyzer, if you have a fairly efficient receiving antenna, the preamp will typically overload, and in addition you may have to add attenuation. I suspect tha
/archives//html/RFI/2025-07/msg00012.html (12,031 bytes)

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