Frequency Shift Keying.
It was used allot when I was in the Navy (1950's) for Teletype Machines.
For all I know, it still is used.

I seem to remember "R-Y" as two letters I could type, and it would make the
Teletype Machine go from one extreme function to the opposite extreme
function, in the printer and machine and the code functions.
We used to use that as a way to check out if a machine was functioning
properly, as that would put it through all it's steps.
With age, I am wondering if I am right or wrong on it being R-Y.
Was it R-(?) ??
Best to all----
Ron

wrote in message
...
is it cw i guess new to radio



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