[GreenKeys] Full Duplex / Polar Relays

[Nick England]

FWIW, there is an Army publication with the same name as the Navy
“Principles of Telegraphy (Teletypewriter)” but it has different content.
http://www.navy-radio.com/manuals/tty/tm11-655-tty.pdf

There’s also “Teletypewriter Circuits and Equipment”.
http://www.navy-radio.com/manuals/tty/TM_11-680-TTY.pdf

And for some more reading:
http://www.navy-radio.com/manuals-ttycorp.htm#books


Cheers
Nick

-- 
Nick England K4NYW
www.navy-radio.com
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