[Milsurplus] GP-7 Transmitter

[Mike Morrow]

Joe wrote:

>I am in need of any information or a source of such, pertaining to the
>Westinghouse GP-7 transmitter as used by the Navy in WWII and maybe later.
>Even a schematic would of great help.  

That beast's absolute and irrevocable need for 800 cps AC power is
the biggest impediment to using it without major hacking.  IMHO,
Westinghouse, which made the GP-7 and other "classics" like the GO-9,
created the most bizarre communications equipment of the era.

The Band A tuning unit that you have is the most common.  A GP-7 that
I purchased several years ago as complete NOS turned out to only have
about half the tuning units, most of different serial numbers, and one
of the HF tuning units was gutted!  The non-Band A units are somewhat
hard to come across, though they show up on ebay.  The ham band tuning
units are the hardest to find, which has always seemed odd to me.  I
can't imagine the the post-war ham found the GP-7 of much more use
than as a parts source.

An RU-18 or 19 receiver is the appropriate mate.

The Bendix ATD is slightly larger, but far less challenging (no AC power
requirement, and no stack of tuning units required), if one seeks to put
an oddball unit on the air.

Mike / KK5F