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Re: [RFI] A new source of QRM

To: rfi@contesting.com
Subject: Re: [RFI] A new source of QRM
From: "Dave (NK7Z)" <dave@nk7z.net>
Date: Sun, 25 Jan 2026 08:00:58 -0800
List-post: <mailto:rfi@contesting.com>
Hi,

You might consider taking a closer look at your RFI by using an SDR to characterize what is happening over time. See:

https://www.nk7z.net/sdr-rfi-survey-p1/

In some cases, that helps a lot in location, as you get a better feel for what the source is actually doing across a longer time period, and wider frequency range.


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

Random Quote of the day:
I’m just one scientist in a giant team, but I’m the one with the best lab playlist.
Norman Borlaug

On 1/24/26 17:10, Volodya S wrote:
I'm primarily a MW DXer.  I have a remote set-up on an island south of
Alaska.  I'm 10 miles out of town, and almost that much from the town's
diesel generator (and a relatively new solar farm).  I do have neighbours
in the area, but very spread out along a road alongside the ocean.  The
closest is a hundred yards away, and spaced every several hundred yards
along the road.  We have 4.4 acres of ocean front.  I'm very noise averse,
and have been careful to avoid any potential noise sources within our
household.  This source seems to have begun over the last 6 months, and can
be present day or night.  As I type this, the intermittent buzzing, which
sounds almost like CW can become a steady buzz for a few seconds, and again
becomes intermittent.  I can hear it much worse in the VLF/LF band.  I've
attached  links to 3 mp4 files.  I'd appreciate any input on solving this
new noise issue!   Thanks!

https://recorder.easeus.com/share.html?sid=d6944cbda29242bfb6a07eb39ca0b1aa

https://recorder.easeus.com/share.html?sid=807686b2685a4171ba3a48354032a042

https://recorder.easeus.com/share.html?sid=84198a46fc404818b83e651977c06949
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