[Elecraft] OT what the heck is this?

[Ron D'Eau Claire]

Not here Bill.

Sounds like the "ghost of Sputnik".

Ron AC7AC

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It has been there for years, but isn't really a problem until someone
happens to be on that frequency and you want to talk to them. Like this
morning when FO8RZ was working up 1 from 28.002 and with the receiver set on
28.003 I had the pleasure of listening to this repetitive tone until I
worked him :) 

So what the heck is it??  Obviously local, it is always there and never
misses a beat.  I have pulled the big switch and listening with a battery
powered rig, it is still there.  I assume some consumer product uses 10
meters for some unknown purpose...ever encounter this Elecrafters?