[GreenKeys] That's not a RTTY station........

[Jim Haynes]

On Sat, 25 Jan 2020, Duncan Brown wrote:
>> 
> Morkrum did wireless TTY experiments, including with the US Navy, in the 
> early 1920s. They initially used on-off keying.  The first patent using FSK 
> for a "Radio Telegraph" was filed by Lawrence Schmitt of Morkrum in 1924 and 
> issued in 1929: #1,705,211. Probably the first commercial use of FSK RTTY  
> was by RCA on a San Francisco to Hawaii circuit in 1932.
>
Attached is something I was working on at one time, FWIW
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