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From: js2j@mhuxt.UUCP (sonntag)
Newsgroups: net.physics,net.misc
Subject: Re: Microwave and UHF sound detection (bugging embassies, really)
Message-ID: <956@mhuxt.UUCP>
Date: Tue, 18-Jun-85 16:30:32 EDT
Article-I.D.: mhuxt.956
Posted: Tue Jun 18 16:30:32 1985
Date-Received: Wed, 19-Jun-85 04:57:42 EDT
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Organization: AT&T Bell Laboratories, Murray Hill
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Xref: watmath net.physics:2635 net.misc:8126

>     Allegedly, this was an attempt to use the windowpanes in the US
> Embassy as a frequency modulator.  The extremely subtle (relative to 
> --oops-- but not relative to one wavelength) vibration of the windowpane
> caused by speech, etc. could theoretically be "recovered" in a 
> frequency discriminator, permitting "remote electronic eavesdropping."
> 
>     You would need real microwaves (in excess of 40 gHz) to pull this off,
> though. I don't know if this was actually the case but I think this was
> in one of the microwave fishwrapper journals.
> David Anthony

    Howcome you'd need real microwaves?  I'd think a UV laser beam would work
much better anyway.  Such a system seems easy enough to design, so I think
we can safely assume that the CIA or some such organization has already got
them.
-- 
Jeff Sonntag
ihnp4!mhuxt!js2j
    "I went down to the Scrub and Rub,
     but I had to sit in the back of the tub." - Dylan