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

[paul swed]

transistors were first in the r1051s and go wayyyy back.
I was trained on the brand new radios in 1973. Second class at great lakes.
Gosh dollars $27K each.
Regards
Paul
WB8TSL

On Fri, Aug 31, 2012 at 9:19 PM, Francesco Ledda <frledda at att.net> wrote:

> 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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