I dunno - I haven't ever had a UGC-129 - but the capabilities look similar.
The UGC-129 manual I found on line is an Air Force TO but has what looks like a 1977 Navy contract number - weird
TRACOR, INC.   N00038-77-C-0077
Did the Navy fly them aboard P-3 Orions?

Probably the Navy needed something that was gray and twice as heavy for ship/sub ballast?

The military era between mechanical machines (Model 28, Kleinschmidt) and PC/LCD seems awful schizophrenic to me.
Lots of versions with essentially the same features.

Huh - I found this in a 1986 DCA report on UHF SATCOM -
"A prevailing problem is the teletype ASCII character length where the Navy uses 7-bit and the Air Force uses 8-bit"

Nick England K4NYW
www.navy-radio.com


On Wed, Jul 16, 2025 at 11:11 PM Jim Haynes <jhhaynes@earthlink.net> wrote:

I've been meaning to ask if there is any connection between the
UGC-136 and the UGC-129.  The UGC-129 was apparently built for
aviation use and there were at least two versions.  The earlier
one used a type slug similar to that of the MITE; the later used
dot matrix.  There is an absence of any available documentation
of the early UGC-129

        ---

        "Ya can argue all ya wanna, but it's dif'rent than it was."
        "No it ain't! No it ain't!  But ya gotta know the territory."
                Meredith Willson, The Music Man