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#1
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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 |
#2
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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 |
#3
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![]() "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 |
#4
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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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FA: "RADIO, A STUDY OF FIRST PRINCIPLES" 1928 E.E.BURNS-NR | Equipment | |||
FA: "RADIO, A STUDY OF FIRST PRINCIPLES" 1928 E.E.BURNS-NR | Equipment | |||
FA: "RADIO, A STUDY OF FIRST PRINCIPLES" 1928 E.E.BURNS-NR | Equipment | |||
FA: "RADIO, A STUDY OF FIRST PRINCIPLES" 1928 E.E.BURNS-NR | Equipment | |||
WA3MOJ crahses and Burns!!! | CB |