[GreenKeys] Fwd: Interesting cipher machine.

[kn7sfz]

Why does that one ART-13 have what looks to be a speaker?  Mebbe a vent 
for heat?

Asking for a friend...😉

Richard kn7sfz


On 2/10/2022 12:59 PM, Duncan Brown wrote:
>
>
>
> -------- Forwarded Message --------
> Subject:     Re: [GreenKeys] Interesting cipher machine.
> Date:     Thu, 10 Feb 2022 15:59:22 -0500
> From:     Duncan Brown <duncanancy at earthlink.net>
> To:     Michael Katzmann <vk2bea at gmail.com>
>
>
>
> Michael,
>
> Thanks for the link!!
>
> I was not aware that NCM had a youtube channel - looks to be new.
>
> The TTY in there is a TT-30/AGA-1 (aka Teletype Corp. Model 31). The 
> box is a portable TTY and (SIGABA-type) encryption unit in one.  Never 
> seen this version, but description enclosed.  There is a picture 
> (enclosed) of the communications position of President Truman's VC-118 
> aircraft in 1947 using a similar unit.  (note the AN/ART-12 modified 
> for RTTY on the shelf above.)
>
> The original  "SIGABA" machine did not include a TTY.  It had a 
> keyboard and just generated the encrypted signal typed onto a paper 
> tape to be sent out over voice, CW or TTY. Later, there were 
> modifications or adapters to generate the 5-bit TTY code directly. 
> SIGABA was manufactured by Teletype Corp. for the government.
>
>  I believe the proper nomenclature for the AFSAM 4A was "SIGNIN" and 
> "M-294"
>
> Thanks  & have fun,
>
> Duncan
> K2OEQ
>
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