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

[Francesco Ledda]

I found out about that 10 year ago, when I got my 1051C....

FL

-----Original Message-----
From: r-1051-bounces at mailman.qth.net [mailto:r-1051-bounces at mailman.qth.net]
On Behalf Of David Wise
Sent: Friday, August 31, 2012 7:23 PM
To: R-1051 Discussion Group
Subject: [R-1051] Navy and Air Force R-1051B 100cps modules are incompatible

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.
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