Re: High voltage standing waves with a magnetron?

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

Original poster: "Robert Jones" <alwynj48-at-earthlink-dot-net> 

Hi,

 >
 > 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.
 >
  I did say similar to a zener diode.
 From memory of observing the voltage waveform  across an oven magnetron 
its a zener diode of about 4,000V.  The top of the offset sine wave was 
relatively flat  say 10% so its series resistance is about 1/10 of the 
supply impedance which is 1000ohm to 2000ohms (ignoring the C) hence 100 to 
200ohm. Yes about an order higher than the average 0.6W zener diode.


Bob














 > 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.
 >
 > 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.
 >
 >