Re: High voltage standing waves with a magnetron?

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

Original poster: Ed Phillips <evp-at-pacbell-dot-net> 

"Tesla list wrote:
 >
 > Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
 >
 > This is stretching it a bit, bit if they were 4 D-sized lithium ions (or,
 > better still, rechargable zinc-airs, if one could find some) that would
 > crank out about 4.8v -at- 10-20A for a short while.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, February 03, 2004 7:24 AM
 > Subject: Re: High voltage standing waves with a magnetron?
 >
 >  > Original poster: Ed Phillips <evp-at-pacbell-dot-net>
 >  >
 >  > "What if there isn't enough current? I was planning on powering it with
 >  > a
 >  > very small high voltage DC supply. I saw on one website a guy built a
 >  > handheld herf where the entire appratus fitted inside the magnetron
 >  > casing
 >  > and was powered by 4 D batteries, it of course was pulsed by charging up
 >  > a
 >  > small array of caps at 7000 volts, but it was safe enough for him to
 >  > hold it
 >  > during operation and place his hand right above the transmitter."
 >  >
 >  > That doesn't sound right.  How could he power the heater from "4 D
 >  > batteries"???  As for operating at lower power by reducing the operating
 >  > current (series resistor is simplest as it doesn't require heating the
 >  > cathode from a separate filament transformer), that will
 >  > indeed                    work over a pretty wide power range.  I have
 >  > some little X-band pulse magnetrons here which were rated for about 1 kW
 >  > peak.  I can run them quite stably at powers of less than a watt.
 >  >

	Took a look at that file and apparently he's using 3 D cells (couldn't
tell type) to head the filament.  Bet they last a very short time but
his HV PS might work.  I've run a pulse magnetron using a simple
capacitor charged up from a low-current HV source and discharged through
a spark gap and it works.  Probably horrible spectra but power comes
out.

Ed