RE: High voltage standing waves with a magnetron?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Philip Chalk" <phil-at-apsecurity-dot-com.au> 

	Simple enough - just a series resistor!  Note that the magnetron
volt/ampere curve is not like a Zener diode (battery in series with a
low-resistance diode, but that it also has a series resistance. I
couldn't find an oven magnetron characteristic data sheet in a Google
search but came up with a lot of hits on non-oven uses, primarily ham
radio.
	
Ed.


Hi Ed, all,

Granted, but it would have shocking regulation.  In order to limit the
current to the extent required, (using the normal MWO supply) most of
the voltage would appear across the resistor, & it would need to
dissipate several hundred watts.

[Clang -another late-nighter]

Sorry, that's wrong.  To limit 4kV DC to 1mA (into a short circuit)
would dictate 4M Ohm. It would dissipate 4W. Horrendously inefficient
anyway - not that it matters.
However, as soon as the tube started drawing current (I agree it would
drop out of oscillation & behave as a diode at some lower threshold
voltage.), the bulk of the voltage would appear across the resistor; its
apparent resistance would be way below 4M resistor. So it wouldn't make
a practical oscillator.


I was thinking more along the lines of a voltage & current regulated
supply, or the normal MWO supply followed by a current regulator, or
constant-current source.  Your series resistor approximates a constant
current source, but with awful voltage regulation.

Phil Chalk.