[GreenKeys] 'Old' portable Teletype...

[WA5CAB at cs.com]

There is at least one more TT-30 around.  If George hasn't gotten rid of 
it, he has one.

In a message dated 2/9/2010 7:38:17 PM Central Standard Time, 
duncanancy at earthlink.net writes: 
> The Model 31 was produced from 1949-1959, only about 500 units were made. 
> 
> It was originally designed for the military as a light weight and compact
> mobile terminal for RTTY.  The military version, TT-30/AGA-1, ran on 24VDC
> and is the only known teletypewriter to use both a dynamotor and an tube! 
> There is a 250VDC generator built into the 24VDC motor to provide loop
> current and operate the RTTY converter.  They were apparently worried that
> the motor governor would generate RFI, so there is a 25L6GT sticking out 
> of
> the top of the unit that does the motor governor switching.  There is an
> extra contact on the keyboard transmitter designed to key the transmitter
> when you start typing.
> 
> I have a feeling that as a military unit it was a flop (since they didn't
> make many of them), though President Truman's plane had one installed. 
> Since the military wasn't interested, Teletype Corp. apparently put in an
> AC sync motor and a handle on the top and sold it as a "portable" to be
> taken to sports events.
> 
> Don't know why they didn't use the M14, unless they were looking for
> something a little newer and/or different shape factor.
> 
> The AWA Museum has a working TT-30/AGA-1.
> 
> 73 &have fun,
> 

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