Frank wrote:

snip


I once looked at a microwave oven on a spectrum analyzer (Loosely coupled
near the door seal). The signal was spread over 100s of MHz. It also
appeared to be pulsed. The spectrum, however, did not look like the
expected
Sa(x) distribution. Magnetrons are not noted for their stability, and are
probably not suitable for CW. I have played with tunable 500 mW klystrons,
and they can drift 10s of MHz (at 12 GHz), in a very short period of time.

73,

Frank


In the article I quoted above they tune the magnetron frequency by
varying the voltage to the magnetron. I wouldn't be surprised if the
oven's DC to the magnetron was filtered lightly or not at all.

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com