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From: "Dirk Bruere"
Subject: Re: Any ideas on measuring radiation in the home ?
Date: Wed, 9 Oct 2002 23:50:04 +0100
Reply-To: "Dirk Bruere"
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"John Woodgate" wrote in message
> 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:
> >There have been a number of systems demonstrated over the years where one
> >ultrasound beam is modulated with audio and is decoded by another
> These require quite high-energy ultrasound beams, which have only a very
> short range in air. It is extremely unlikely that the sources could be
> In any case, **why would anyone want to?**
Jokers like me.
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.
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