[GreenKeys] 850 shift history - AN/FGC-1

[Nick England]

Well, I found my FGC-1 manual but it is later than the 1943 Western
Electric typewritten ones abstracted on my web page at
https://www.navy-radio.com/rtty-demod.htm
These came from Duncan Brown some years ago

The one I have is August 1952 TM 11-356 which supersedes the 1943 edition
and is typeset in typical TM fashion. One interesting addition is that when
radio frequencies in the 70-kc to 500-kc range are used, a frequency shift
of 170 cps is used which necessitates replacement of the M and S filters to
2465(M) and 2635(S).
You learn something new every day, huh?

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