[Milsurplus] BC-611 power

[J Forster]

 OK, all this talk about power supplies for portable MilCom gear got me
 talking to N3PBR, my next door neighbor, who is an adjunct professor of

 Electrical Engineering at Wilkes University here in town.

 My thoughts were to suggest to Dave that his undergrads needed a
project:
 design, prototype and produce a dc-to-dc converter for BC-611s,
 PRC-6,8,9,10, etc, etc. He didn't say "no" so we may be onto something
here.
 It will keep our money in the States and I have indicated that the
units
 need to be serviceable not potted in epoxy as some imported units are.

 Comments?

 73 Rich W3OSS



It's a relatively straight forward task. I roughed out a design for an
inverter to run a WS 58 (Canadian, 6 to 9 MHz). It had a 555 as a clock
running about 120 Hz, a flip-flop divide by two to ensure symmetry, a
quad gate to ensure the oscillator was running and protect the output
FETs, a 24 V CT Radio Shack filament transformer run backwards and a
bridge and single stage, full wave, doubler (the 58 set needs both 90
and 180 VDC). There was also a small full wave tripler off the primary
side of the transformer to make a -21 V C bias. I used a small reed
relay, rewound with heavy wire, in the filament line so the inverter
would come start when the set was switched on.

The whole thing required 8 C or D cells (2 for filaments, 6 for HT) and
I figured 30 to 40 hours per battery set with Alkalines.

I never got to packaging it for the set, but I know it worked.

-John