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Total 120 documents matching your query.

81. Re: [RFI] Further data on my weird RFI problem (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Fri, 7 May 2021 11:30:53 -0500
OK, that probably rules out switching power suppies and there kin. 73, Scott K9MA Hi Scott - I should have mentioned that.  As far as I can tell, each of the frequencies is very stable.  When I final
/archives//html/RFI/2021-05/msg00010.html (10,268 bytes)

82. Re: [RFI] LED lighting fixtures - (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 24 May 2021 14:18:32 -0500
I think some of the LED tube replacements can run directly from the AC line, bypassing the ballasts. It's a minor wiring job, which I highly recommend. The electronics in the tube can interact with t
/archives//html/RFI/2021-05/msg00075.html (13,758 bytes)

83. Re: [RFI] Crepe Myrtle growing into power pole RFI Why? (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 24 May 2021 14:24:44 -0500
Any two conductors anywhere near HV line can cause noise if they are not either well insulated from each other or securely bonded together. The field from the HV wires induces voltage in the conducto
/archives//html/RFI/2021-05/msg00077.html (9,745 bytes)

84. Re: [RFI] Crepe Myrtle growing into power pole RFI Why? (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 26 May 2021 11:15:22 -0500
I have, back before they increased the voltage to 14 kV. The noise correlated well with branches swaying in the wind. When I finally got the utility to trim the trees, the noise level went way down.
/archives//html/RFI/2021-05/msg00106.html (8,277 bytes)

85. Re: [RFI] Noise located and FIXED (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Sat, 19 Jun 2021 16:35:10 -0500
Wow, that was a bad one! The weaker ones can be much harder to find, but still troublesome. 73, Scott K9MA The pole is 2.1 miles from my QTH. When I tried unsuccessfully to use the flag in the end-ga
/archives//html/RFI/2021-06/msg00062.html (12,795 bytes)

86. Re: [RFI] Line noise vs Frequency (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 10 Aug 2021 13:05:38 -0500
I've been doing just that for years, and agree completely with Chuck that it's a key. You otherwise will waste your time tracking the wrong sources. Put the station HF receiver in AM mode, turn the A
/archives//html/RFI/2021-08/msg00026.html (11,689 bytes)

87. Re: [RFI] DFing intermittent connection (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 11 Aug 2021 16:05:06 -0500
Back when I first got back on the air, lots of neighbors used "rabbit ear" antennas for TV. After much investigation, it became clear that they were picking up harmonics from every metal on metal con
/archives//html/RFI/2021-08/msg00037.html (11,358 bytes)

88. Re: [RFI] DFing intermittent connection (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 16 Aug 2021 11:30:35 -0500
Or just use the braid from some RG8 and a couple hose clamps. -- Scott Ellington. K9MA -- via iPhone _______________________________________________ RFI mailing list RFI@contesting.com http://lists.c
/archives//html/RFI/2021-08/msg00063.html (10,576 bytes)

89. Re: [RFI] DFing intermittent connection (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 16 Aug 2021 16:27:16 -0500
Gee, it's worked for me for years. Not much salt spray in Wisconsin. 73, Scott K9MA Please ignore Scott's advice, it will cause tower corrosion and quickly fail 73 Frank W3LPL Or just use the braid f
/archives//html/RFI/2021-08/msg00074.html (12,402 bytes)

90. Re: [RFI] DFing intermittent connection (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 16 Aug 2021 17:41:44 -0500
Hi Frank, That makes sense. All I ever used it for was as a shunt around the thrust bearing, for which the impedance probably wasn't that critical. 73, Scott K9MA Braid is always a poor choice outdoo
/archives//html/RFI/2021-08/msg00077.html (13,052 bytes)

91. Re: [RFI] DFing intermittent connection (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 16 Aug 2021 22:02:37 -0500
We get plenty of lightning in Wisconsin, but in my case the shunt around the thrust bearing (and rotator) is mainly to prevent harmonic generation when shunt feeding the tower.  If the tower gets a d
/archives//html/RFI/2021-08/msg00079.html (14,785 bytes)

92. [RFI] Enphase Solar System RFI Tests (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 19 Jul 2022 10:47:28 -0500
My next door neighbors recently installed a solar system, with the panels no more than 60 feet (18 m) from my antennas. The primary antenna is a tribander at 70 feet, with a 40 meter rotatable dipole
/archives//html/RFI/2022-07/msg00042.html (9,056 bytes)

93. [RFI] RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 16:59:16 -0600
I have what appears to be  very strange RFI source: it's very broadband, covering at least the whole 20m band, but it's somehow modulated at 1100 Hz. In AM mode, the 1100 Hz tone is audible and it, a
/archives//html/RFI/2023-01/msg00140.html (7,732 bytes)

94. Re: [RFI] RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 17:07:13 -0600
On 1/31/2023 4:59 PM, K9MA wrote: I have what appears to be  very strange RFI source: it's very broadband, covering at least the whole 20m band, but it's somehow modulated at 1100 Hz. In AM mode, the
/archives//html/RFI/2023-01/msg00141.html (8,092 bytes)

95. Re: [RFI] RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 17:12:19 -0600
Audio recording: https://sdellington.us/hr/RFI/NW%2020m%20AM%2023.01.31.mp3 Stephanie WX3K I have what appears to be very strange RFI source: it's very broadband, covering at least the whole 20m band
/archives//html/RFI/2023-01/msg00142.html (8,442 bytes)

96. Re: [RFI] RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 17:38:24 -0600
It appears to be only on 20. 73, Scott K9MA 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resourc
/archives//html/RFI/2023-01/msg00145.html (8,771 bytes)

97. [RFI] Noise Level During Power Outage (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 23:21:42 -0600
My QTH is in an older residential area, surrounded by overhead power lines. Line noise is a constant problem. We recently had a major power outage, so I measured the noise levels to get a baseline wi
/archives//html/RFI/2023-02/msg00000.html (8,909 bytes)

98. Re: [RFI] Noise Level During Power Outage (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 31 Jan 2023 23:26:41 -0600
That table didn't come out very well at all. Here's a link to the pdf: https://sdellington.us/hr/RFI/Power%20Outage.pdf 73, Scott K9MA On 1/31/2023 11:21 PM, K9MA wrote: My QTH is in an older residen
/archives//html/RFI/2023-02/msg00001.html (8,737 bytes)

99. Re: [RFI] Noise Level During Power Outage (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 1 Feb 2023 06:52:39 -0600
Hi Jim, I've had some noise sources which were electronic, but most have been power line related. Besides the preponderance of 120 Hz harmonics in the AM audio, the very broadband nature of line nois
/archives//html/RFI/2023-02/msg00004.html (9,596 bytes)

100. Re: [RFI] Noise Level During Power Outage (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 1 Feb 2023 09:32:28 -0600
Don't be too envious, Pete.  Those levels are from the K4 panadapter with a 10 kHz span, which means a noise bandwidth of about 20 Hz. (Resolution bandwidth 11 Hz.) Besides, I have a power splitter a
/archives//html/RFI/2023-02/msg00009.html (11,817 bytes)

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