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From: John Woodgate
Subject: Re: Any ideas on measuring radiation in the home ?
Date: Thu, 10 Oct 2002 08:02:02 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 10 Oct 2002 09:32:05 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Dirk Bruere
wrote (in ) about 'Any ideas on
measuring radiation in the home ?', on Wed, 9 Oct 2002:
>I really want to try the one suggested by Bill Beatty.
>It involves placing a concealed mike near the pavement and feeding the
>signal to speakers pointed at the pavement (just short of creating
>feedback). Apparently it creates a weird echo effect for passersby.
Get one or two horn loudspeakers and mount them high up and as far from
the microphone as you reasonably can. The echo is delayed by 1 ms per
foot of path. You want at least 50 ms delay for best results.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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