[GreenKeys] Early Teletype in the RN

[Duncan Brown]

On 03-Jan-17 23:19, John Nagle wrote:
> 1923 would have been very early for this. It says "Teletype"
> on the drawing, which would have been the 1923 Morkrum machine.

Charles & Howard Krum experimented with wireless transmissions of 
printing telegraph signals and communicated from Chicago to Milwaukee, 
almost 100 miles, in about 1921.  In 1922, the US Navy did air-to-ground 
tests, using the Morkrum M11.  These, and the RN's tests, were probably 
just using on-off keying, which probably didn't work very well 
(especially with the simple receivers of the day).

There were various patents for "RTTY" in the 1920s, but I don't think 
that the use of FSK for regular commercial RTTY started until the late 
1930s ?

Have Fun,

Duncan
K2OEQ


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