[Milsurplus] TBW Transmitter power-ON/Generating high voltage(mobile/portable)

[Mike Hanz]

Bill Pileggi wrote:

>Good comment about the computer UPS's. I commonly pick up one, or am at least offered one, at EVERY hamfest. For FREE. With a dead battery. The last one was on May 3, I picked up a 900 watt unit. Very heavy. Most seem to be in the 300-400 watt range.
>
>I test them by removing the gel-cell batteries and hooking to a high-current 12V source (some run from 24vdc). If the unit starts working, putting out 110vac, we have a winner. (Don't plug in the line cord.) Sometimes you have to turn "ON" the front panel switch or throw a dip-switch in the rear. If it still doesn't operate, it's scrap, and of little use for us.
>
>You can rectify the 110 vac output directly, or install voltage-multiplier chains to get the desired high-voltage output. You could also simply build a stock power supply to run from the UPS, your choice. 
>

Hmmm...900w?  About perfect for a TBW.  I don't know how difficult it 
would be to modify the 60Hz oscillator in one. You might have to cut a 
couple of traces on a PC board and tack on another oscillator.  Yes, any 
of these supplies is heavy.  The Behlman ACM-3000 I use for 400Hz weighs 
190 lbs in three 7" rack sections.  :'(   Anyway, I think it is a 
distinct possibility for getting either 800Hz or 400Hz for aircraft 
equipment.  If I hadn't glommed onto the Behlman supplies so cheaply, 
that's the path I had intended to take.

Mike  KC4TOS