[RFI] Fwd: Mystery signal on 40M (more)

[N4ZR]

Curiouser and curiouser. Today, from roughly 1500Z to 2200Z, this signal 
was present, and fairly strong, at 50 KHz intervals across 40 meters - 
7000, 7050, 7100, 7150.  Structure was the same, with what look like 60 
and 120-Hz sidebands. This evening, there is a pure note on 7000, 
nothing on 7050, 7100 or 7150.  This is two evenings in a row when it 
has disappeared.

Still looking for ideas on what this could be, or how to track it down.

73, Pete N4ZR



-------- Forwarded Message --------
Subject: 	Mystery signal on 40M (edited)
Date: 	Thu, 8 Apr 2021 16:49:26 -0400
From: 	N4ZR <n4zr at comcast.net>
To: 	RFI List <rfi at contesting.com>



(edited)

I've run across a signal on 40M that has me puzzled.  It is centered at 
7049.8 KHZ, as best I can tell.  Because this reflector doesn't accept 
images, I have put an HDSDR image in Dropbox with a link address of 
https://www.dropbox.com/s/zgat3frt70zhrgg/wide.png?dl=0. As you'll see, 
it definitely has 120Hz major intervals, as well as minor signals at 60 
Hz in between.  They look like "sidebands" of the central signal  That 
tempts me to think it must be some sort of powerline-driven device, like 
a switching power supply. but there's only one of it, so far as I can 
tell, across the HF spectrum here, and it was not there this morning 
when I got up.

Before I start running around killing breakers, does this look familiar?

-- 
73, Pete N4ZR
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