[R-1051] Fwd: different J4 connectors on rear - E to F or G model?

[Nick England]

The early type has a 39 pin and the later type a 12 pin.

But for most of the 39 pins, the early type schematic says "NOT TO BE USED".
The pins that are used are for several audio outputs, sidetone, keyline, a
115vac connection, and a coupler interlock - stuff used in the AN/WRC-1
configuration (R-1051 + T-827 + AM-3009). The "auxiliary" 115vac connector
is the one we all use, but in the WRC-1 the main 115vac came in from the
interconnecting box via the 39 pin connector at J4.

I guess they used the same 39 pin connector as the T-827 and RT-618 for
some reason - maybe to make the cabinets identical?

On the G model, only 4 pins are used (two audio outputs) and the other 8
pins are labeled "SPARE". I am guessing that they gave up on the WRC-1 use
with the F or G models.

Nick England K4NYW
www.navy-radio.com

On Sat, Sep 9, 2017 at 7:27 PM, Al Parker <anchor at ec.rr.com> wrote:

> I wonder how many connections they left off for the later ones?  About
> half as many contacts.  I don't have a schem. closeby to look at.
> 73,
>
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>
> "There is nothing -- absolutely nothing -- half so much
> worth doing as simply messing about in boats"
> Ratty, to Mole
>
>
> On 9/9/2017 6:11 PM, Nick England wrote:
>
>> You learn something new every day - I just noticed the J4 connector on the
>> rear of the earlier R-1051 models is different from the later ones. I
>> wonder where this transition occurred. I don't have photos of the F model,
>> but one style was used up through the E model, and a different style for
>> the G and H models.
>> E model
>> http://www.navy-radio.com/rcvrs/r1051/r1051e-1509-03.jpg
>> G & H models
>> http://www.navy-radio.com/rcvrs/r1051/r1051h-1709-05.jpg
>>
>> My other R-1051 info and photos are at
>> http://www.navy-radio.com/rcvrs/r1051.htm
>>
>> Any help, comments, corrections?
>>
>> Nick England K4NYW
>> www.navy-radio.com
>>
>