Thanks for the advise.

Obviously if it was trivial to modify magnetrons for communications in the
13 cm S band, there would be a lot of high power activity on that band and
fewer dead microwave ovens in landfill sites.

Surely a near KW of radio energy can be used for more than re-warming
left-overs. Maybe not.

No problem, glad to help. It still might be interesting to plug in the
parameters to the free space radar equation, considering receiver noise
figure, and signal BW, etc.. I am sure there is data available on the
reflectivity of the Lunar surface. Of course COHO/STALO will only work if
you are receiving your own signal, so not much use if you are attempting to
work others.

As I suspected, some work has been done on the injection locking of
magnetrons; as in
http://www.lancs.ac.uk/cockcroft-ins...ul04/tahir.pdf
This presentation recommends an injection signal of 2% power, or 20 W in the
case of a 1 kW magnetron. I have no experience on solid state amplifiers at
such a frequency (except for TWTs), but the construction of a single loop
synthesizer using ,a National Semiconductor chip, and a Z-Communications (or
Mini-Circuits etc.) SMT oscillator is trivial. There are lots of eval.
boards available for a nominal cost. I think Z-comm. has one, but have not
priced it recently. I guess such projects are a bit impractical unless you
have a good spectrum analyzer

73,

Frank