I used to work in TV News. I think it was channel 8 of the 2 GHz
microwave band that we used for ENG where we had intermittent
interference that was credited to microwave ovens. Once I was
tempted to light up a weak and fluttery signal on channel 8, 2 GHz
transmitter and feed it with a camera looking at a Fluroscope screen
(you remember those from the shoes stores) that showed a chicken
skeleton on a plate rotating. It was real tempting, but I never got
around to doing it. Rats, another opportunity missed!
Burt, K6OQK
At 08:29 AM 1/18/2010, [email protected] wrote
I specifically tested for that at the time (even though I did not pull the
spectrum analyzer to verify) and I was able to run the laptop (a Dell D400
running in B/G mode) about 3 feet right in front of the oven without obvious
network access problem.
The router was in the next floor up, but pretty much right above the laptop,
so the signal was strong either way.
Knowing how much the frequency drifts on these magnetrons, I may just have
been lucky, but actually that proves the point. If the spectrum was very
wide, the stability would not matter so much.
I tend to consider Panasonic to be one of the more responsible consumer
product company. Their products are consistently rated among the most
reliable in the commercial world, not that it means a whole lot with regards
to EMI.
Didier
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Chuck Harris
Sent: Monday, January 18, 2010 12:21 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
Ever see the spectrum of a typical microwave oven that is powered by a
switching power supply? It is so broad and messed up that it will wipe out
the wireless routers that share the same band. At least the old style ovens
had a fairly narrow 60Hz spur somewhere around 2450MHz.
-Chuck
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
K6OQK
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