[GreenKeys] RTTY (and SSB) in WW2

[Nick England]

On Sun, Oct 17, 2021 at 2:15 PM Harold Hallikainen <harold at w6iwi.org> wrote:

> On Sun, October 17, 2021 10:32 am, Nick England wrote:
> > An interesting an informative article is here
> > "Military Teletypewriter Systems of World War II"
> > https://www.nonstopsystems.com/radio/pdf-hell/article-AIEE-1948.pdf
> >
> Thanks for posting! An interesting idea is on pdf page 8. They transmitted
> two mark tones and two space tones on an SSB transmitter to get frequency
> diversity.
> Harold
>

============
This was standard practice on the Navy's UCC-1 multiplex system. Called
"twinning". Also the selector switch included 4 channel diversity as well
as 2.
https://www.navy-radio.com/rtty-mux-ucc1.htm

IIRC, one of the Army's RATT TU's will do the same thing, simultaneously
running 85Hz as well as 850 Hz shift.
MD-522 used with the GRC-106 maybe?
Nick
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