[GreenKeys] AN/MRC-2 US Army's first deployable RTTY??

[wa5cab at cs.com]

Duncan,

I and a few others refer to the 'Old" system (which dates to 1940) as the 
"Short Number" system.  The new one that was phased in beginning around 1955 
is obviously referred to as the "Long Number" system.  To my knowledge, no 
manual was moved from Short to Long simply by having its number changed (as 
happened with a few pieces of hardware).  The set of manuals on a few pieces 
became mixed, mostly by having short number operations and maintenance 
manual and long number parts manual.  There were also a very few cases of an in 
between system.  For example, the T-368/URT manual started as TM 11-809.  
Then it was split into TM 11-809-10, -20 and -35.  Which were never re-done as 
TM 11-5820-nnn-nn.  But the parts manual shifted from SIG 7 & 8 T-368/URT to 
TM 11-5820-258-20P and -35P.  

Incidently, I've been looking for TM 11-5820-258-35P for a long time.  If 
anyone has or knows of a copy, please contact me.

The T-368 would have been the transmitter in your AN/GRC-26D.

In a message dated 1/15/2010 8:41:45 AM Central Standard Time, 
duncanancy at earthlink.net writes: 
> Bob et al, 
>  
>  Thanks for your description on the old TM numbering system.  I know the 
> "new" numbering system (eg TM 11-5815 = TTY), but never looked at the old 
> numbers enough to see any "system."
>   
>  How many pages in MC-543? What does it cover/  Is it available scanned or 
> for sale??
>   
>  I forgot to mention that I helped maintain a AN/GRC-26D in Viet Nam in a 
> support company to the Big Red One.
>   
>   
>  have fun,
>   
>  Duncan
>  
> 
> 

Robert & Susan Downs - Houston
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