As you said - it’s a Portable repeat character and dot transmitter.  Model ED51 

The ED51 manual is here….
https://www.navy-radio.com/manuals/tty/184B-test-1402.pdf

Set the bit switches to continuously transmit some desired character. Or it can produce continuous MSMSMSMS…..
Useful for testing. 


On Sun, Jul 24, 2022 at 2:09 PM E. <hanyou@xsmail.com> wrote:

On the recent Teletype rescue that I went on, just got a call that they found one more piece.  A Teletype WD-1954-H.  I’ll pick it up later in the week (haven’t seen it yet) and so far I’ve only found one diagram on it (diagram only) — it’s a Portable repeat character and dot transmitter.  What is this???
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