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From: "John Jardine"
Subject: Re: Homebrew Microwave Interferometer
Date: Thu, 28 Nov 2002 22:00:36 -0000
NNTP-Posting-Date: 28 Nov 2002 21:48:43 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Rene Tschaggelar wrote in message
> John Jardine wrote:
> > markthomas77@Hotmail.com wrote in message
> > news:email@example.com...
> There was this case where after a certain period of time some embassy
> employees became suspicious of the window cleaners. They came a bit too
> often. They in fact did have a salty solution that was said to be radar
> reflective. I forgot the where and when of this story.
> Ing.Buero R.Tschaggelar - http://www.ibrtses.com
> & commercial newsgroups - http://www.talkto.net
I love the story of the Russians presenting a magnificent carved eagle
statue to the US Embassy in Moscow (cold war era). Ended up in one of the
conference rooms where it remained for a number of years.
Eventually discovered to contain within its base a passive resonant cavity
(appears simply as a space) that could be excited into re-radiation by an
external source of microwaves. Conversations within the room acoustically
coupled through a diaphragm into the cavity and then retransmitted out of
the building at microwave frequencies, to be listened to by nearby gentlemen
with suitable detection equipment.
To get a useable S/N Required dosing the area where the statue was with
quite high levels of RF.
After the statue was discovered. The Russians then tried to make use of
*any* fortuitive passive resonant cavity that may have existed throughout
the whole buildings structure.
This required *massive* amount of RF to be dumped on the building and led to
a number of staff falling ill to radiation sickness related problems.
Needed a diplomatic incident before the practice was ended.
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