[GreenKeys] [AWA] We have this Model 31 Teletype and need the control box as showen...

[Duncan Brown]

Ed,

The picture in the Tele-Tech article may have been a mock-up just for 
the magazine article, as it was written many months before the M31 
manual (Bul. 200) came out and a couple years before M31 production 
started.

According to the Teletype Corp. Museum books, there were 500 M31s 
produced, between 1949 & 1959. There may have been very few of the AFSK 
converters made.  The AN/AGA-1 spec sheet 
(http://www.virhistory.com/navy/rtty-tu.htm) I sent you does not list a 
manual number for the TT-31/AGA-1 (the AFSK converter).  The manual 
listed for the TT-30/AGA-1 (the M31 printer) is listed as "80MA" which 
just the Teletype Corp. Bulletin 200, M31 manual with a one sheet cover 
page.

Most military RTTY used a 20 ma loop. The 60 ma loop was a left over 
from the telegraph days and when a telegraph or "printing telegraph" had 
to drive many miles of wire. Most Teletype Corp. M14, 15, & 19 machines 
would only run on 60ma, so hams were required to stay with the old 60 ma 
standard.  If you have a TTY only a few feet from the radio, a 20ma loop 
is sufficient & doesn't require as much power.

have fun,

Duncan
K2OEQ

On 14-Nov-13 12:10, COURYHOUSE at aol.com wrote:
> Duncan - we have our eyes out   for a case  for yours.   your military 
> model  needs   the  proper holes in it for the lights  etc  that are  
> unique to that military model.
> Question is though  re: photo in this  article....was this 
> control/AFSK  unit issued to the military or  just  offered as 
> a  commercial  item?  If  military  there  should be a manual we can 
> get hold  of that will  provide a wealth of knowledge.
> In the  article  it is clearly the commercial  version of the Model 
> 31  being shown...
> another thing  notice they mention   this  being a 20 mil loop   on 
> the  commercial one... glad to learn that before I lit  mine off... 
> Our  commercial one  belonged  orig  to John Sheets then George 
> Hutchinson then  us.
> One  thing  of  note... there was a large offering of these machines  
> to HAMs... but  since they were tape printers   did not  get as much  
> love as the page  printers... like the model 15 the  good thing?  
> these things are  small enough they  my be  lodged under  workbenches 
> and in out of the way places still
> at  SMECC we are trying to    figure out  how many of these are  still 
> around  so If  you  have  one  or know   of some one  lets  get a 
> count.....   drop note to info at smecc.org <mailto:info at smecc.org>
> many thanks  Ed Sharpe Archivist  for SMECC - Arizona's Communications 
> and computation museum
> www.smecc.org <http://www.smecc.org>
>



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