I finally got around to wiring up my URC-32 to my TTY, keying, and audio switchboards (I’d just been using the handset previously). I also had to install a field change from 1962 or so. 
The URC-32 seemed to work fine on the 850 shift RATT net this morning. We had 8 check-ins and a nice roundtable chat. 
When was the last time a URC-32 was running RATT? I suspect a long time ago…..
https://www.navy-radio.com/misc/shack2/urc32_4841.JPG


Cheers
Nick K4NYW