May I suggest checking all your PSUs. I had the same issue once and it turned out to be the PSU running a tuner. I binned the PSU and installed a tried and tested new one. No more issues.

73,

Alan. G4GNX


------ Original Message ------
From: "Victor Rosenthal" <k2vco....@gmail.com>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 12/11/2020 14:16:53
Subject: [Elecraft] OT question about receiving loop antenna

I have an RF Pro 1b receiving loop antenna which I use for diversity reception 
on my K3. It used to be sold by Pixel Technologies, and now it is handled by DX 
Engineering. If there is someone else who has this same antenna, please contact 
me off list.

My antenna seems to be producing a strong (-50 dBm) spurious signal that starts 
around 7400 kHz and drifts down. It is frequency modulated at the line 
frequency. I have replaced the preamp and I still have the problem. I am pretty 
certain that it is not an external signal, but I would like someone else to 
check theirs for the same issue as a sanity check.

-- 73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
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