[RFI] Strange birdies on 10M

[Pete Smith N4ZR]

Recently (just the last couple of days), I have noticed that my RBN 
receiver is showing a far above-average number of decoders on 10M.  
Investigating this, I see that *only* on 10M, I seem to have a series of 
birdies.  They are every 8 KHz, and are comprised of a central signal 
and two weaker ones about 600 Hz either side, and vary substantially in 
"loudness", although the loudest are still below S0 on my K3,

I'm unlikely to invest much time, considering the weakness of the 
signals, but am wondering if the characteristics suggest some particular 
kind of SPS or other device

-- 
73, Pete N4ZR
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