[GreenKeys] Fwd: The Flying White House 1947

[Duncan Brown]

The TTY part of SIGNIN seems to be based on the Teletype Corp M31, aka 
TT-30.  The TT-30 was part of the AN/AGA-1, which was an AFSK RATT/RTTY 
adaptor.  The AGA-1 just fed audio tones into ANY radio, so no FSK 
converter was necessary.  (Of course for HF, it probably didn't work as 
well at a true FSK system would have.)

The AGA-1 consisted of the TT-30 TTY and a "TT-31" AFSK converter.  I 
don't know of any pictures exist of the TT-31, so would be hard to 
identify if it was being used with the SIGNIN.

Duncan, K2OEQ
USASA  31J

> Thanks to Robert Downs for this information...
>
>   But I would guess that
> it all amounts to an FSK modification.  As the T-47 and T-47A don't
> come with FSK capability..
>
>