[GreenKeys] Fwd: The Flying White House 1947

[WA5CAB at cs.com]

OK.  I had a TT-30/AGA-1 once upon a time.  Still have the manual but I 
think that George has machine now.

The TT-31 must therefore have been the functional equivalent of the 
TT-40/SGC-1.  My guess is that the black panel with two meters above and to the 
left of the operator could be the TT-31.  Running the T-47 for extended periods 
in AM with high modulation levels would account for the addition of the 
blower..  However, an encrypted AFSK system doesn't account for the coaxial 
cable going into the right end of the transmitter.  As the audio would have 
been on the secure side of the system, there would be no need to run it 
shielded

In a message dated 02/15/2012 19:34:59 PM Central Standard Time, 
duncanancy at earthlink.net writes: 
> 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..
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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