I have a bunch of UGC-74s and at 100lbs their definition of portable was pushing it already.

Jeff

On Apr 19, 2025, at 7:17 PM, Duncan Brown <duncanancy@earthlink.net> wrote:

 At 180 pounds (!), it is what the Navy would consider "portable" ("anything that can be carried on a battleship").

The UGC-143 looks similar to the Space Shuttle teleprinter Curious Mark did a series on a few months ago -  https://www.youtube.com/watch?v=7HihKMIVnbs
Initially, he refers  to it as a "Navy teletype", but later shows pictures of the AN/UGC-74 (which was more Army & Marine Corps)

A block diagram of the UGC-74 & UGC-143 would probably be pretty similar, but was there any connection between the two?  Or just two different manufacturers trying to solve the same problem?

Have fun,

Duncan,
K2OEQ

On 4/19/2025 2:33 PM, Nick England wrote:

This is a circa 1988 machine I am trying to revive with not enough technical info. To my surprise the control unit and the printer appear to work - but not the keyboard.

A description and photos of the beast are at

http://www.navy-radio.com/tty/ugc143a.htm

It, of course, uses multiple microprocessors - It will pass BIT diagnostics except that evidently the printer Z80 isn't talking to the keyboard Z80 so it doesn't think that the keyboard is actually plugged in. I believe that the keyboard Z80 is alive because the one-line display on the keyboard says PLEASE WAIT.

I have an operation and troubleshooting manual which covers the built-in test routines, but that stops at the "replace the keyboard assembly" stage.

So does anyone have a spare keyboard or a tech manual with schematics that I could borrow?

This is a very long shot, but you never know what someone has accumulated.

Cheers,

Nick England K4NYW
www.navy-radio.com

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