Hi Jim
Some time back you posted a very interesting article about the use of 'illuminating signals' and resonant cavities as listening devices.
I can't locate the email on any of my computers. I was wondering if you recall the article and could you please repost it.
You made mention of Marty Kaiser's doppler stethoscope (10 GHz) and certain frequencies (33 G Hz ?) that can actually recover audio from water vapour in a speaker's voice (expired air).
Any information about this threat would be most appreciated.
Thanks in advance.
Regards
Michael J. Dever CPP PSP
Dever Clark + Associates
GPO Box 1163
Canberra ACT 2601
Australia
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Email: d..._at_bigpond.net.au
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