References: <%_wk9.52964$1C2.firstname.lastname@example.org> <email@example.com>
Subject: Re: Any ideas on measuring radiation in the home ?
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Date: Thu, 03 Oct 2002 05:13:53 GMT
NNTP-Posting-Date: Thu, 03 Oct 2002 05:13:53 GMT
Organization: AT&T Worldnet
Thanks for the feedback. Excellent.
"John Michael Williams" wrote in message
> "News2020" wrote in message
> > I just noticed that even unplugging an microwave oven while not in use
> > releases a burst of radiation (even at 2 feet away with the oven
closed). > used a small led detector.>
> Hi News.
> I've read several of the postings in this thread.
> I think maybe advice to build your own apparatus may
> not be constructive, because if you are asking this
> kind of question seriously, you may not have the expertise.
> You can buy a MicroAlert microwave detector for about $90
> at http://www.maui.net/~emf/MicroAlert.html
> It is sensitive from about 100 kHz to around 3 GHz, and if
> you unplug an inductive load near it, it will peep.
> You can use it to detect RF-based evesdropping bugs
> in your home, if you suspect them. You can tell when
> someone is using a cellphone nearby, etc. Hold it near
> your computer monitor, and it will pick up the scan.
> The general principle of RF detection is: Get
> an antenna, connect a detector (diode), amplify it,
> and display the result on an oscilloscope,
> loudspeaker, etc.
> People educated in radio engineering often
> are not aware that the diode stage is
> an electronic design requirement. Because
> diodes are not evident in the human body, they
> assume there is no detection. Ultimately, this
> misunderstanding leads them to conclude the body
> must be a thermal detector, if at all.
> "Either diodes or temperature" is the reasoning.
> This may explain the many rather puzzling statements
> in response to your question.
> But auditory response to radar pulses has been
> very well established in the peer-reviewed scientific
> literature. It can not be explained in terms of
> rectification (diodes) or heat: There is not enough power.
> Frey (1962) has calculated that the human auditory system
> (probably the inner ear) can detect radar pulses in the
> GHz range (carrier; rep rate in audio range) almost as well
> as a transistor radio can pick up a station. Read the
> scores of experiments reported in the supplement to Radio
> Science in 1977. Frey published a report in Science
> magazine in 1979 (v. 206, p. 232), and it will give you a
> way to back-track the literature from there.
> So, don't believe anyone who says that the human
> body is insensitive to RF, except the thermal effects.
> There are other effects. Happily, they are not usually
> NOTICEABLY produced by commonplace utilities, so we are not
> bothered by them, unless, of course, someone purposely
> makes it so.