[R-1051] Navy and Air Force R-1051B 100cps modules are incompatible

[David Wise]

I've been studying NAVSHIPS 0967-970-9010 and TO-31R2-2URR-221C.

Both versions of the 100cps module input switched +4V on pin 2 for the PLL.

In the Navy R-1051B manual, the module uses IC's.
It inputs +4V on pin 7 for the divide-by-ten.
The vernier pot gets +15V from an unknown source.

In the Air Force B-C supplement, the module is all discrete transistors.
It outputs regulated +15V on pin 7 for the vernier pot.
It regulates +20V down to +4V for the divide-by-ten.

This means you can't put an Air Force module in a Navy radio, and vice versa.  Watch it!

Dave Wise

Regarding the speculation as to which came first, the IC version or the transistor version,
because of the 4V power supply, which the transistor designers had no earthly reason to
use except if it was already in use, I come down on the side of IC's first.  Then the
supply dried up and they fell back on transistors.