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From: dsi@unccvax.UUCP (Dataspan Inc)
Newsgroups: net.physics,net.misc
Subject: Re: Microwave and UHF sound detection
Message-ID: <213@unccvax.UUCP>
Date: Thu, 13-Jun-85 11:01:37 EDT
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Posted: Thu Jun 13 11:01:37 1985
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    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
Chief Development Engineer 
DataSpan, Inc.
.