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Phil

If I remember right they operate from 900 Mhz to 1 Ghz. Almost all had a 900 watt magnetron in the 50's I think that the 60's MW's were the same.  
 
Early MWOs

All these MWOs in question operate at 2450 Mhz just like current MWOs, the odd ones were GEs full sized ovens that combined microwave cooking in regular P-7 self cleaning ovens, these all operated at 915 Mhz.  GE built these 915Mhz ranges from 1966-1975 and then they switched to 2450 Mhz for the remainder of the time that GE made any combination ovens.

 

I have had 9 of these GE 915 Mhz combination ranges and still have 5 of them, I have heard that GE built some of these MWOs earlier than 1966 but can not find any evidence of them selling them to the public, I even though that this HP MWO cooking center was just a promotional appliance till Jeff [ MoparVrigina ] spotted this one in York Pa a few months ago.

 

I purchased the HPCC from a guy that bought the house where the HP had been delivered to and used in 1958, he gave me all the orignal paperwork and cook-books etc with it.
 
John

you are right.

 

it was shown by Kinn and Marcum (1947) that various sizes and shapes of heating cavities could be obtained by varying the wave guide termination. Similarly, the effect of heating and thawing foods with microwaves was studied by Morse and Rivercomb (1947) at 1,050 megacycles. They first described the "runaway" problem wherein the food thawed at one point and attracted a disproportionate share of energy.

In the early efforts, the Raytheon Company, the General Electric Company, and the Westinghouse Company were actively pursuing development programs in the United States. Raytheon selected 2,450 megacycles as a frequency for concentration while General Electric preferred to work with a frequency of about 915 megacycles. The U. S. Navy hoped to find a more appropriate method for preparing food in submarines and sponsored evaluations of ovens through the Bureau of Medicine and Surgery (Sussman 1947). They remained optimistic but respectful of the skills and special equipment involved.

 

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