"John Smith" wrote in message
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I would think a 1KW or greater magnetron run off a non-filtered and
particularly dirty, but rectified dc supply (you could even feed a ramp or
triangle dc power wave to the magnetron to cause frequency sweep) and into
a sloppy waveguide exhibiting multiple resonant frequencies would knock out
all cell phone and wireless communications on shf+ freqs for blocks if not
miles... you would probably start jamming the cell towers for miles around
and have every "pirate transmitter" hunter in America on your tail... in a
large city/metro area you would cause havoc to break out--this WOULD BE ONE
SERIOUS OFFENSE!!! If caught, you would learn to call prison your home!

And Bruce, in the cell next to you, would fall in love with you!

Not to mention the danger of exposure to the freqs in question--this would
be best left alone...

Interesting paper concerning microwave magnetrons at
http://www-personal.engin.umich.edu/...laes_tps04.pdf

Mention is made of magnetron cavity Qs in excess of 200. The spectral width
of such a source, at the 3 dB points, would therefore be about 12 MHz. Not
really suitable for CW, but far better than my observations. Comments about
poor power supplies are probably correct.

It is interesting to note that the spectral purity of oven magnetrons is of
concern with regards to interference to the 2.4 GHz ISM band.

There are techniques for the stabilization of magnetrons when used for
Moving Target Indication (MTI) on RADAR systems.

The fact is it is very easy to build a high stability synthesizer -- with
spectral widths of the order of 1 or 2 Hz -- at 2.4 GHz. Amplification is
another matter, since a 2.4 GHz TWT probably costs around $7,000.

73,

Frank