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

[Duncan Brown]

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/






---
This email has been checked for viruses by Avast antivirus software.
http://www.avast.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TT-36GGA-1.jpg
Type: image/jpeg
Size: 108215 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20141125/84a9b03c/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TT-36 cover off.jpg
Type: image/jpeg
Size: 124803 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20141125/84a9b03c/attachment-0003.jpg>