Re: MOT Wiring Question

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Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com> 

Thanks All,

Scrappin em out, I found another goodie, a variable voltage switch. (I
think that's what they called it.)  It looks something like a glass reed
switch with a low voltage coil around it.  It was in the HV line to the
magnetron.  I also got one MO that had the secondary potted in green RTV or
similar compound.

The largest MOT that I have, is one I scrapped out of a Kenmore last spring.
The core was 6"x6"x3" with an equally large cap.  I'm working on a 2KV coil
with that one, but I wish I could find a mate for it.

David E Weiss


 > Original poster: David Speck <dave-at-davidspeckmd-dot-org>
 >
 > David,
 > Good Find!  I have disassembled a couple of these old Radaranges.  I think
 > the 4 kV refers to the total DC output of the doubler stage.
 > These MWOs have the most powerful MOTs of any domestic MWO I have
 > disassembled.  The small separate transformer is indeed a highly isolated
 > filament transformer.
 > The Radarange MWOs have at least double the power handling capacity of the
 > common cheapie Sharp MWOs that I find in almost new condition by the
 > dozens, though all of them put out about the same voltage, give or take
20%.
 >
 > Someone posted a while back that a magnetron behaves like a 4 kV zener
 > diode.  Therefore, there's no advantage to having a MOT that puts out,
say,
 > 6 or 8 kV.  However, the more current the MOT puts out, the more microwave
 > radiation you can make.  The magnetic shunts in the MOT core provide a
 > degree of current limiting to regulate the whole system, as do the
 > components of the voltage doubler.
 >
 > Dave
 >