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

[Nick England]

The illustrated applications in the manual show this make-break tone device
being used for landline or for VHF links (FM or AM I guess).
Nick

Nick England K4NYW
www.navy-radio.com

On Fri, Feb 16, 2018 at 6:49 PM, Ralph Mowery <rmowery28146 at earthlink.net>
wrote:

> 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@
> 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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