F5AFY

@bwilson Hi, I know unlocked PLL can do funny things and what you suggest certainly occured in time, but these chirps are so numerous and frequent, and often periodic with a few seconds cycle that it makes very probable an industrial process.

"Fish Hook Swisher" they call it, in this forum discussion :

Somewhere else, I read that it can use 10s or 100s of kilowatts, so shielding these owens and their supplies is not an easy task.

Thanks all for this interesting discussion !

Hi @smg,

It looks like a "Link 11" or Stanag 5511, sent in DSB, so you can use USB or LSB and put the carrier (displayed frequency) in the middle of the middle gap...

73, Terry