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Old January 25th 08, 03:31 AM posted to rec.radio.amateur.homebrew
Bert[_2_] Bert[_2_] is offline
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First recorded activity by RadioBanter: Jan 2008
Posts: 6
Default Syncing Up Multiple Magnetrons

Many members are correct. I have never done anything like this, and
there is considerable danger in what I am considering. Why would I
want to try such a foolish thing?

The nature of the experiment is to test the feasibility of beaming
power to a Thermoacoustic Engine. The ultimate goal is to power a
climber to compete in the elevator2010 contest where first prize is 1
million bucks. Now I don't expect to power a 100 pound climber with
one 1000 watt magnetron. The oven magnetron was only to test the
concept. For the real thing one would need a Burle S95608E100

Elevator2010: http://www.spaceward.org/elevator2010-pb.html
Burle 100K Magnetron: http://www.burle.com/cgi-bin/byteser...s94608E100.pdf
Thermoacoustic Engine: http://www.io.com/%7Efrg/tac.htm

Cheers,
Bert

On Jan 22, 5:06*pm, (gudmundur) wrote:
In article ,
says...



Does anyone in the group know anything about magnetrons? I planning to
do some experiments in transmitting microwaves.


I would like to use standard magnetrons from a microwave oven and
believe I can beam further if operated at the same frequency and
with the outputs in phase. I have no idea on how to do this. Please
advise


Cheers,
Bert


*Kind of a strange side note to the syncing issue,
There are commercial microwave ovens that use 2 magnetrons.
These ovens are usually in food courts of large business
offices or factories. They are 220vac powered of course.
Since a single mag oven produces power only on a small
portion of one half of an a.c. line cycle they did a neat
trick in the twin mag ovens and switched the line connections
to one power transformer. (the ovens have two complete and
separate h.v. supplies) So one mag makes power on the positive
half of the line cycle and the other makes power on the
negative half of the line cycle. Strangely enough I have
run into several units having the same 'in phase' line
connection (by accident or tampering I guess) and they
still work fine. Both mags tightly coupled to the cavity
producing power at the same time on the same half of the
line cycle. Talk about injection locking!!! 2 mags looking
right at each other, and I have not found their service
life to be any shorter but they take longer to pop popcorn.
Probably several reasons for that, but a differance you can
see and measure with a watch. Just by switching the primary
transformer leads back to the 'normal' out of phase condition
popcorn gets done faster.