[ARC5] GP-7 Power - A Little Noisy

[Mike Everette]

The chances of finding one of these are non to slim; however, aboard ship the Navy used several aircraft type transmitters and radar jamming transmitters which ran on 800 cycle power.  These were powered through a motor-generator system which ran from 440 volts AC, 60 cycles; I'm unclear as to whether the 440 was single phase or 3 phase.  Some of you ex-Navy electricians can answer this perhaps.

These setups used some fairly hefty motors to turn the 800 cycle alternators.  Among the systems so powered was the shipboard version of the GP-7 transmitter.

I was aboard the USS North Carolina at Wilmington during Museum Ships weekend a couple of weeks ago, and saw the transmitter, which is complete and has all its tuning units.  It wasn't operational.  I was operating CW, call sign NI4BK, using an Icom IC-725 because the ship's big rigs were still down.  ANATHEMA.  JAPANEE radio....!  It belonged to someone in the club there.  I should'a taken my Ten-Tec Scout.

73

Mike
W4DSE



--- On Fri, 6/14/13, David Stinson <arc5 at ix.netcom.com> wrote:

> From: David Stinson <arc5 at ix.netcom.com>
> Subject: [ARC5] GP-7 Power - A Little Noisy
> To: "ARC-5 Yahoo" <ARC-5radio at yahoogroups.com>, "ARC-5 List" <arc5 at mailman.qth.net>
> Date: Friday, June 14, 2013, 10:23 PM
> I've been working on 800-cycle power
> to run the Navy GP-7 transmitter.  I think I've gotten
> the right balance of dynamo-batteries-charger.  The
> gloves and face-mask I use when starting the machine
> haven't been all that much trouble, but it's still just a
> little bit noisy.  Turn up your speakers:
> 
> home.netcom.com/~arc5/DynoStart.mp3
> 
> The fire extinguisher has been handy, especially when the
> secondary winding kicks in....
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