[GreenKeys] on-off radio teletype (not FSK)

[Ralph Mowery]

I did not take time to read all about it, but isn’t that set up to use either AM or FM where there is a carrier on all the time  and audio tones are used that are cut off and on.

 

At one time off/on keying is all that was allowed on the lower ham bands.   I think when hams could use 11 meters (before CB) AM with tone could be used.  

There would be a big difference in having a carrier on all the time and just off and on of the signal.

 

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Friday, February 16, 2018 5:01 PM
To: Greenkeys
Subject: [GreenKeys] on-off radio teletype (not FSK)

 

How common was on-off radio teletype (not FSK) back in the day?

Did hams ever use it or was it strictly a military or commercial thing?

This question poked up in my mind as I was scanning the manual for a 1952 RTTY converter designed for 60-600 wpm on-off keying.
http://www.navy-radio.com/manuals/r466-uc-man-91612-5202.pdf

One block diagram shows it being used to receive on-off tone signals via VHF that were generated originally from an AN/FGC-5 which is a gadget that time-multiplexes four TTY lines together. 




Nick England K4NYW

www.navy-radio.com

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