Hi Didier:
You may want to see about a recall.
The US Food and Drug Administration (FDA)
<http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=1030&showFR=1>
has a regulation on microwave oven leakage. In Title 21 it states that
the power density limit from an operating microwave oven "shall not
exceed 1 milliwatt per square centimeter at any point 5 centimeters or
more from the external surface of the oven, measured prior to
acquisition by a purchaser, and, thereafter, 5 milliwatts per square
centimeter at any such point."
http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=1030&showFR=1
Have Fun,
Brooke Clarke
http://www.PRC68.com
Didier Juges wrote:
I could not resist, so I checked my relatively expensive Sears/Kenmore
microwave oven.
The results are there:
http://www.ko4bb.com/Test_Equipment/Microwave_oven_leakage/
In one word, dismal. Almost 1W peak power leakage at 1 foot, and almost
100MHz occupied bandwidth.
I looked with a crystal detector driving a scope, and it is obvious the unit
is driven from a 60Hz transformer with half wave rectification, and has no
filtering whatsoever, like the first Microwave oven I have ever opened (a 20
years old model long dead).
Didier KO4BB
-----Original Message-----
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris
Sent: Monday, January 18, 2010 8:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
As I understand it, the supplies are 100KHz, and have no
significant filtering at HV. They modulate the magnetron
with the 100KHz PWM mess. As long as the signal doesn't
leave the rather wide ISM band, they are under no obligation
to filter anything.... routers, etc. are squatters on the IMS
band, after all.
I am sure that some brands are better than others, but then
some brands are only $50.
I don't have any of the new ovens as yet... My old beaters
from the early '90s are still running strong. I have no
neighbors, so their choices are not an issue.
-Chuck Harris
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