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Old June 1st 07, 11:05 PM posted to rec.radio.amateur.antenna
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Default Water burns!

Mike Kaliski wrote:
So there is definitely something significant about the 3 Cm wavelengths used
in microwave ovens and interaction with water molecules at that frequency.


From Wikipedia:
"Cooking food with microwaves was discovered by Percy Spencer
while building magnetrons for radar sets at Raytheon. He was
working on an active radar set when he noticed a strange sensation,
and saw that a peanut candy bar he had in his pocket started to melt.
Water, fat, and other substances in the food absorb energy from
the microwaves in a process called dielectric heating. Dipole
rotation is the mechanism normally referred to as dielectric
heating, and is most widely observable in the microwave oven
where it operates most efficiently on liquid water, ..."

I never realized that rotating my dipole was contributing
to global warming. :-)
--
73, Cecil http://www.w5dxp.com
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Old June 1st 07, 11:18 PM posted to rec.radio.amateur.antenna
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Default Water burns!

Cecil Moore wrote:

...
I never realized that rotating my dipole was contributing
to global warming. :-)


I never rotate my dipole unless I am alone with the XYL. :-P

JS
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Old June 1st 07, 11:48 PM posted to rec.radio.amateur.antenna
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Default Water burns!


"Cecil Moore" wrote in message
...
Mike Kaliski wrote:
So there is definitely something significant about the 3 Cm wavelengths

used
in microwave ovens and interaction with water molecules at that

frequency.

From Wikipedia:
"Cooking food with microwaves was discovered by Percy Spencer
while building magnetrons for radar sets at Raytheon. He was
working on an active radar set when he noticed a strange sensation,
and saw that a peanut candy bar he had in his pocket started to melt.
Water, fat, and other substances in the food absorb energy from
the microwaves in a process called dielectric heating. Dipole
rotation is the mechanism normally referred to as dielectric
heating, and is most widely observable in the microwave oven
where it operates most efficiently on liquid water, ..."

I never realized that rotating my dipole was contributing
to global warming. :-)
--
73, Cecil http://www.w5dxp.com


Cecil

Thanks for that. I know that a company called Tappan started producing
domestic microwave ovens as early as 1948 in the US. I have a rebranded
model bought new in the UK in 1980 that's still going strong and in daily
use. I had to open it up once when the lamp blew and took out an internal
fuse. Inside the casing was a full circuit diagram with part numbers and
full contact details for service. American engineering, built like a brick
out house and it does what it says on the box. No turntable, just a glass
shelf and power is either on or off. I have heard that some of the original
1948 models are still working and have no reason to disbelieve it.

Now if only everything else could be built to last like this...

Mike G0ULI


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Old June 4th 07, 01:30 PM posted to rec.radio.amateur.antenna
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Posts: 326
Default Water burns!

Mike, out in the workshop I still have the original Fridgidaire 'radar
oven' I bought in 1971, with my GM discount at the time... The
magnetron was hammered on day and night by a herd of kids who are now
middle aged... I can only estimate how many times that magnetron has
had the filament cycled...
Assume ten times a day probably low times 26 years = ~96,000
cycles!!!

The pot metal latch on the door broke about 10 years back and it was
relegated to shop use because some kid might fry his eyeballs if he
doesn't understand he has to hold the door shut against the spring
with one hand and hit the power switch with the other and the solenoid
safety lock will then keep the door from springing open while the
magnetron is on...
The other reason is that it didn't match the decor of the granite and
stainless steel kitchen in the retirement house...
It still has power to spare and heats a cup of tea water in half the
time of the expensive new microwave...


denny - k8do

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