.... if I was to attempt to jam that broad of range of freqs, I would
couple it to a waveguide which exhibited resonance on that whole
spectrum (feed the center of circular guide/"modified horn" with
shortest point to edge of circle resonant at 2.4 ghz resonant, longest
point to edge of circle resonant at 800 mhz) , feeding the magnetron a
ramp or triangle dc voltage/current of 1 mhz freq--is going to generate
harmonics until the cows come home... I would feel like Dr. Frankenstein
when the neighbors showed up on my door step with their pitchforks and
scythes!!!
Warmest regards,
John
"Frank" wrote in message
news
bNre.54658$on1.13081@clgrps13...
"John Smith" wrote in message
...
Me:
Oh really, so if part of the waveguide is made resonant at 800 MHz
and I am striking it with a "1KW hammer" it will not "ring" at all?
Funny, but that runs against all I have seen here in the real
world...
John
A waveguide can be considered a very wide bandpass filter. Any
frequency coupled to the waveguide, within its pass-band, will appear
at the output of the waveguide. There will be no spurious signals
attributed to the waveguide. As mentioned previously; measurements I
have made on microwave oven magnetrons indicate an extremely wideband,
highly unstable signal, covering hundreds of MHz either side of the
nominal 2.45 GHz. The potential for interference to other services,
particularly the 2.4 GHz ISM band, and to a lesser extent, the 1.9 GHz
cell frequencies, is fairly high. It is doubtful that any significant
energy will be present at 800 MHz.
The relative spectral purity of the magnetron measured in
http://www-personal.engin.umich.edu/...laes_tps04.pdf
probably used a laboratory grade 4kV power supply. Note, however,
that significant 120 MHz sidebands (and harmonics) are present.
Frank