-> I don't think it's radar at all.  They've been using such devices for
-> a few years to find people trapped in collapsed buildings.
I'll concede that I'm wrong. The TV reporter, though, made it out as if it 
were something brand new. I got the impression that it wasn't a listening 
device, i. e., a super-sensitive microphone, because as the developer, a 
fellow named McEwan (my guess at the spelling), demonstrated its ability to 
detect cardiac rhythm on the other side of a concrete slab, both he and the 
reporter were conversing. A high-gain microphone would have blown out from 
the SPL of the conversation relative to the SPL of the heartbeat. My 
guess/theory was that the bounced back signal returning to the device had 
been modulated by the cardiac rhythm. I know I'm asking for trouble, because 
surely someone knowledgeable will read this and point out what an idiot I am. 
At least that way, I'll know how this thing works. It's an ill wind that 
blows no good, right?
 Yours, Blair
P. S. Couldn't get on to your BBS yesterday.
--- InterEcho 1.18
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