Ok one more time-
AN/UGA-1 is NOT repeat NOT a frequency-division multiplex system. 

UGA-1 is a time-division multiplex device that has 16 synchronous serial teletype signals on one side and a single serial time-compressed stream on the other side. All digital teletype signals. The time-compressed stream interfaces to a crypto system that processes sixteen serial characters in the same time as one 100wpm character. 

On the 16-channel side the UGA-1 connected to a separate device such as AN/UCC-1 which IS a frequency-division multiplexer providing VFCT (voice frequency carrier telegraphy) to run comms over wireline, HF, UHF, microwave etc. 

If you aren’t tired of this topic yet, check out my pages full of TTY multiplexer info at
https://www.navy-radio.com/rtty-mux.htm

Cheers
Nick K4NYW 

On Thu, Dec 7, 2023 at 6:32 PM W2HX <w2hx@w2hx.com> wrote:
Yes they were designated LLSB and UUSB. 

Sent from Nine
From: Francesco Ledda <frledda@att.net>
Sent: Thursday, December 7, 2023 6:05 PM
To: Nick England
Cc: milsurplus@mailman.qth.net
Subject: Re: [Milsurplus] AN/UGA-1 Mux, know it ?

No, the TSC-60 is not VHF or UHF. It is HF with 4 sidebands. These are the two standard SSB sidebands and two other sidebands above the traditional SSB sidebands! This kind of systems were used by all services. In the early 90s, the UCC-3 was replaced by modern digital modems!

Best, Francesco K5URG

Sent from my iPhone

On Dec 7, 2023, at 15:39, Nick England <navy.radio@gmail.com> wrote:


BTW the UGA-1 talked to the crypto system on one side and to a 16-channel frequency division multiplexer on the other side which was used for HF RTTY - 85 Hz shift on 170 Hz centers was standard for the fleet broadcast and other HF RTTY.

Nick England K4NYW
www.navy-radio.com


On Thu, Dec 7, 2023 at 4:25 PM Nick England <navy.radio@gmail.com> wrote:
Time-division multiplexer for use with TSEC/KO-5 crypto gear - it interfaces with 16 channel frequency-division multiplexer for RTTY.


FUNCTIONAL DESCRIPTION The AN/UGA-1 is designed to accept multiplexed output of sixteen (16) channel multiplex equipment and divides it into sixteen (16) separate channels which are synchronously related to each other. Output on each channel is in six (6) unit synchronous signal. The receive portion of the equipment performs companion function.
RELATION TO OTHER EQUIPMENT The AN/UGA-1 is designed to be used with but not part of AN/UGC-3() for use on frequency division telegraph systems.
TYPE OF DIVISION: Time-division type. 
TYPE OF OPERATION: Neutral. 
TYPE OF ACTUATION: DC actuated. 
NUMBER OF CHANNELS: 16. 
NUMBER OF WORDS PER MINUTE: 60, 75, 100 words per minute per channel. 
RELATION OF CHANNELS INPUT AND OUTPUT: The 16 channel inputs and outputs are synchronous in nature and are synchronously related.

The KO-5 crypto system is a monster-

Nick England K4NYW
www.navy-radio.com


On Thu, Dec 7, 2023 at 4:11 PM Hubert Miller <Kargo_cult@msncom> wrote:

Anyone familiar with the USN UGA-1  16 channel TTY multiplexer, used with the UGC-3 radio ?

I have a large ‘Teletype Corporation’ preliminary instruction book, and man does it look “prelim”,

with lots of sort of unpolished drawings. Lots of transistors. This must be for a VHF system, right,

or they couldn’t put that many channels on a signal ? Can someone give me the short version of

what this system was about ? Date on manual, 1960.

-Hue Miller

Newport, Oregon

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