US Navy AN/UGC-136AX, AN/UGC-136BX, AN/UGC-136CX
Teleprinter/Teletypewriter (Canadian AN/UGC-504)

Some Restoration Info - from experimenting, not from a manual - use caution!
Please send me any additions, corrections, etc.

Power connector

Movie

I got mine working!

Compose/Edit Message - press EDIT MSG, then ENTER - C/E ACT lamp illuminates

• PRINT ENABLE = ON prints the incoming characters and disables keyboard echo
                                 any buffered characters get printed at high speed (120cps).
  PRINT ENABLE = OFF - incoming message goes to a buffer for later printing. 
                                  Keyboard echo is enabled
                                  MSG ST ACT lamp lights
• PRINT MSG - prints the composed message with line numbers
• LINE xx, then ENTER - prints line xx
  • DLTE - deletes line xx
  • INSRT- inserts new lines after LINE xx - EXIT when finished inserting lines
• DLTE - prints entire message then asks "DELETE ??" - I don't know how to say NO yet!
• prints EXIT when finished composing 
• I don't know how to number or save messages yet - there should be storage for 64 messages.

11/21/17 - I cannot transmit keyboard characters or transmit a message yet.....
       - the TX DATA line from the USART is working, because BREAK works, but I get no data...
Update 11/27/17 - I tacked on some wires to scope out the UART - and I found -CTS high. 
I had tied CTS to RTS on the DB25 but that was evidently a mistake.
 (Leaving CTS open works fine because of pull-up resistors on the line receiver input.)
Now I can transmit from the keyboard! - press XMT MSG, then ENTER => XMIT ACT lamp will light.
Turn off Transmit Echo switch, Turn on Transmit Print.
This will put you in full duplex mode - you can receive and transmit at the same time.
          (PRINT ENABLE = OFF lets you send while receiving into a buffer)
          (If PRINT ENABLE = ON, you can still send while receiving/printing but sent characters do not print unless Transmit Echo is on)
But there is no way out of this mode short of Master Clear - you can no longer compose messages.
So I am still missing something in the way this thing is supposed to create/send messages 
              - but at least I can run simple full duplex.

I have requested a manual via a Freedom Of Information Act request - we'll see how that works out.........

The AN/UGC-136CX is a ruggedized send-and-receive teleprinter, controlled by a microprocessor with an internal solid state memory, and full-message composition and editing capabilities; it prints data at a nominal 120 characters per second (1200 bps). It can transmit or receive at data rates from 50 to 9600 bps to or from the message storage memory, and can operate in switch-selectable Baudot or ASCII codes. The storage capacity of 64 messages or 256K random access memory (RAM), permits the short-term storage of received messages while the operator simultaneously composes and stores outgoing messages for transmission. Multiple communication ports also provide a bulk-storage device compatibility.

AN/UGC-136AX

AN/UGC-136BX (ECI) - This one is missing the keyboard

The commercial designation  is E-Systems T-1148 - see ads below