[GreenKeys] Teletype Corp. TT-36/GGA-1 ???

[Jack Hart]

Definitely looks like Model 15 era parts and pieces...note
the Model 14 TD tape "gate".
Maybe late/post WW II equipment?

Jack K0TTY


-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Duncan Brown
Sent: Tuesday, November 25, 2014 7:03 PM
To: Green Keys
Subject: [GreenKeys] Teletype Corp. TT-36/GGA-1 ???

Anyone know anything about the TT-36 and/or AN/GGA-1??    The AWA Museum 
just received a donation of a TT-36/GGA-1 (pictures enclosed) .

I have found very little about it on the Internet (mostly on Navy-radio.com).  The AN/GGA-1 is described as a "Teletypewriter Group" 
and consists of the TT-36 tape reader and TT-37 & -38 reperforators (don't know what the difference is between the TT-37 & TT-38, except that the TT-38 weighs twice as much as the TT-37). Some descriptions say it is used with "classified equipment" others (AN/TSC-35 manual) call it cryptographic equipment.

The TT-36 has 24 cam-operated switches and 8 multi-pole relays.  It looks like it could encrypt a signal by itsself, but there is no obvious way to change the "key" other than the "Group Eliminator" switch on the front.  There are two toggle switches under the cover, but the only identification for them is "484" above the upper one. It does not look like it would be easy to change the cams.  There are two large connectors on the back, so maybe encryption was done in a different unit.

The TT-36 has a tag labeled "Teletype Code ZA0U2HG"  and a US Patents tag for patents # 2074189 & 2326148 (these patents have to do with stopping a tape that has broken and reading chadless tape)


JANAP 161 says that the AN/GGA-1 operates at 460 opm (75 wpm?), so maybe this unit was designed to interoperate with some European TTY crypto gear??

Any ideas??

Thanks,

Duncan Brown, K2OEQ
USASA  31J30

Antique Wireless Association Museum Asst. Curator, Commercial Equipment (also Chief TTY operator & repairman) http://www.antiquewireless.org/






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