[GreenKeys] FWIW - an "official" EIA to neutral signal interface

[Nick England]

The 186627 to connect neutral signaling (current/no-current) teletype
equipment to EIA devices (data sets, etc.)
https://www.navy-radio.com/manuals/tty/spec/50694s-iss2-7401.pdf
https://www.navy-radio.com/manuals/tty/wd/wdp0238-186627-iss9.pdf

Don't get too excited unless you have a M33 or M35 with a UCC29 - it
isn't for general 60ma loops.

Nick England K4NYW
Chapel Hill NC
www.navy-radio.com