[GreenKeys] Why and When 7.00 vs. 7.42 unit code?

Mon Mar 10 10:28:08 EDT 2014

Jim,

Yes, it sounds like you were converting FGC-25s to FGC-52s as they had 
the stepper function option along with the 7.00 code (according to the 
manual).  I have seen the stepper function option mentioned (even on the 
TT-76, I think) but never used it.  We did not use the stepper functions 
with KW-7 or -26 in 1967-68, but may have only be working with 60 wpm.  
Maybe the stepper was only for 100wpm? (Maybe KW-7 & -26 couldn't keep 
up at 100wpm?)

-Duncan

On 10-Mar-14 10:01, Jim Plummer wrote:
> I'll add some fodder the mystery...
> While stationed at Andersen AFB, Guam (1958 Comm), we did a 
> modification to the AN/FGC-25's to add a stepper function. This 
> changed the nomenclature to AN/FCG - 52... as I recall. This allowed 
> the KLI gear to synchronize with the crypto equipment (so I was 
> told).  The crypto equipment was KW-7 and KW26.  Being 19 years old at 
> the time, TTY was my job not a passion.  So I just install the mods 
> and then headed to the beach.  These modifications included  a couple 
> of gears and a stepper box for the TD.  There may have been other 
> changes that I don't recall.  The year was '66 or '67.... a lifetime ago.
>
> de Jim
> /
> /
>
>
> On Monday, March 10, 2014 9:41 AM, Duncan Brown 
> <duncanancy at earthlink.net> wrote:
>
>     Nick,
>
>     I've been wondering about 7.42 vs 7.00. (& 8.00) also.
>
>     US Army Signal Corps (KLI) used both also.  But KW-7 & KW-26
>     crypto units worked with 7.42 codes.
>
>     Seemingly identical units would be available in both codes under
>     different numbers, so it was apparently important to keep them
>     separate.  For example, the AN/FGC-25 & -26 (KLI's "ASR") was
>     supplied with 7.42 code. But the seemingly identical AN/FGC-52 &
>     -68 used 7.00 code from the tape reader and 8.00 code from the
>     keyboard.
>
>     I always assumed it was some computer equipment that couldn't
>     handle a fractional data bit.  Maybe Autodin?? (I believe that
>     Autodin used AN/FGC-161, -162 (low level signaling version of the
>     FGC-25) machines. But lthe FGC-161 was 7.42 and the FGC-162 used
>     8.00 from the keyboard & 7.00 from the tape reader.)
>
>     I would think it would be hard to sync on a 7.00 code??
>
>     Another good mystery to work on!!
>
>     73,
>
>     Duncan
>     K2OEQ
>     USASA  31J30
>
>
>     On 10-Mar-14 08:09, Nick England wrote:
>>     OK, I understand 7.00 unit code means you can run a bit faster,
>>     but who used it in practice and in what circumstances?
>>
>>      I understand WU was all 7.00 - is this right?
>>
>>     Looking at the Navy's list of TTY units, there were both 7.00 and
>>     7.42 unit machines galore - how was it decided what to use where?
>>     Were all on-line crypto machines 7.00 or some systems were 7.42
>>     and some were 7.00? Or what? What about Signal Corps gear?
>>
>>     Was there just a break and after July 17, 1958 all new Bell
>>     installations used 7.00 or whatever? Or was this decided on a
>>     case by case basis - and what was the basis?
>>
>>     Thanks for helping to reduce my confusement.
>>     Nick England K4NYW
>>     http://www.navy-radio.com/
>>
>>
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