HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: HarryHydro on June 07, 2022, 2045 UTC

Title: All over 6 meters. 10 minute intervals, 60 second tx
Post by: HarryHydro on June 07, 2022, 2045 UTC

Hi: I’m in Jersey.  I’ ve been monitoring 50.293, 6M WSPR frequency.  Every10 minutes, on the 5th minute, I’m hearing 60 seconds of something. It sounds like a pulsing buzz. Maybe 5 pulses per second.
4:05, 4:15, 4:25, etc. Sometimes it sounds stronger than others.
I though it was splatter from some nearby digital operator. I used a SDR and scanned from 0 to over 200MHz in that 60 seconds, looking at a 2MHz window, and I seen nothing significant.  Then, on the next 10 minute interval, I scanned 440. Nothing overpowering. It seems to be strongest on 6, but it’s a 6 meter antenna.
Tnx, Harry

Title: Re: All over 6 meters. 10 minute intervals, 60 second tx
Post by: HarryHydro on June 07, 2022, 2047 UTC

BTW, it starts at about 15 seconds after the minute, and ends at 13.

Title: Re: All over 6 meters. 10 minute intervals, 60 second tx
Post by: HarryHydro on June 20, 2022, 0135 UTC

Found the source! It’s my old LED clock! When the last digit is ‘4’, it makes this noise in my radio.
(http://qsl.net/k/kb2men/Ledclock.JPG)