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From: "Ian Buckner"
Subject: OT:Re: Digital divide by ten, 1949 style
Date: Tue, 24 Sep 2002 10:10:39 +0100
Organization: Agilent Technologies
References: <3D84D4B3.50B511EF@webaccess.net> <3D850A3C.31381AD5@webaccess.net> <3D852DB5.2AEB8909@webaccess.net> <3D856710.79959F55@webaccess.net>
NNTP-Posting-Date: Tue, 24 Sep 2002 09:10:41 +0000 (UTC)
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"David Lesher" wrote in message
> Chuck Simmons writes:
> >The 866 was not really hefty. Rather small as I remember and used
> >power stuff. The 872 was fairly hefty but the 575 was definitely
> Eons ago, we worked on RF heaters for a plastic dish plant. It was
> a LC circuit; you put the pellet between the cap plates and ran it
> for ~2 minutes. It was allegedly at some 27Mhz ISM frequency.
> For some reason, there was a notable lack of CB antennas [Hey, I
> eons ago..] in that area.
Long ago I once worked with a guy who did his MSc at Jodrell Bank
telescope. They had very intermittent, severe interference. This was
traced to a furniture factory a few miles away. They were using a
for curing the glue used to assemble the furniture.
Instead of a pellet of plastic they put the entire piece of furniture
in the hot spot.
The trouble was they made the chair part of the RF resonant circuit,
and as the
glue cured, the oscillation frequency varied and (with the right size
of chair) swept
across one of the bands the radio telescope was using. So there would
interference for months, until it was time to do a batch of just the
right size chairs...
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