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

[Ralph Irish]

​I guess I stand corrected about Make & Break. I never read it anywhere, but I was told by 
an 'older' RTTY guy that it was not permitted. It could be that Jack is correct in what was 
done just after WW II, and I might also be correct about the rules in the 1960s. 

73, 

Ralph - W8ROI 

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----- Original Message -----

From: "Jack" <wa2hwj at att.net> 
To: "Nick England" <navy.radio at gmail.com>, "Greenkeys" <greenkeys at mailman.qth.net> 
Sent: Friday, February 16, 2018 5:12:17 PM 
Subject: Re: [GreenKeys] on-off radio teletype (not FSK) 



Nick, 



It appears that when Hams first got their hands on TTY’s, FSK was not permitted 

on the Ham bands. So they used make/break keying. It didn’t work well and 

the push for FSK started. This was just after WWII ended. 



Some of the earlier RTTY “handbooks” mentioned the trial and tribulations. 



73, 

Jack K2TTY 







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 <greenkeys at mailman.qth.net> 
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-91612-5202pdf 


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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