[RFI] Mystery noise

[Pete Smith N4ZR]

I don't know if the reflector will allow this image, but thought it was 
worth a try.

   This thing shows up periodically - happily not often.  The 
periodicity makes me think switching power supply, but aren't they 
normally discrete , sometimes noisy, sometimes drifty but fairly narrow 
critters? This has a substantial 120-Hz component, but why every 19 KHz?

-- 
73, Pete N4ZR
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