[Milsurplus] NAVSHIPS 91235 AN/GRC-13 Reprint Available

[WA5CAB at cs.com]

Yes, it would have been much nicer had they put a tunable oscillator in it in 
addition to the crystal oscillator.  It would have only taken one, as the 
transmitter drive is derived by mixing the output of the main oscillator with a 
1600 KC oscillator.  Up to about 8800 KC the crystal is 1600 KC above the 
channel frequency.  From 8800 to 12000 it is 1600 below.

Voltages required are 1.4, 6.3, 90 and 500 (425 when using the GN-28A/U hand 
generator).  Pinouts are as follows:

A,G       +90
C,E       +6.3
D          Ground and all minus
F           +500
H          +1.4
B,J        NC

It came with a full range of power supplies (hand generator, 12/24/115 supply 
and gasoline powered generator).  The PU-158/U gas generator reminds me of 
the 12 volt one for the MAR, although I haven't compared physical size.  The 
PP-272/U supply is about the same size as the radio.  The G-28A/U looks like a 
G-43/GR (cast case with bolt-on top) and sits on a tripod stand.

In a message dated 4/22/2007 4:49:33 AM Central Standard Time, 
wf2u at starband.net writes: 
> Great! Finally I can see some documentation for my GRC-13. I’ve been 
> looking for documentation for it since I got it about 10 years ago, so I can put it 
> on the air. I tested the receiver section with the battery (uses the same 
> BA- whatever,   that is used with the GRC-9 receiver), but I have no clue about 
> the pinout of the power connector. AFAIK it takes the same voltages as the 
> GRC-9. I have no accessories for my GRC-13.
> 
>  I also think it may have been intended to be a replacement for the TBX, but 
> the crystal control makes it pretty awkward…
> 
>  It also reminds me of a TRC-77 in an archaic form…
> 
> 

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)
   
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