[GreenKeys] 28 typer with a pretty full stunt

[Nick England]

FWIW, This FAA document has info about their scheme starting on page 29
(pdf page 37).
http://www.navy-radio.com/manuals/tty/faa-tty-maint.pdf

Cheers
Nick

On Sat, Jun 16, 2018 at 11:03 AM Sheldon Daitch via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Jim,
>
> Okay, and it is that end-of-address sequence which basically mimics
> the NNNN that is used in other systems.
>
> Thanks for the clarification.
>
> Our systems never used any specific location steering...much smaller
> audience.
>
> Thanks,
>
> Sheldon
>
>
> ------------------------------
> *From:* Jim Haynes <jhhaynes at earthlink.net>
> *To:* Sheldon Daitch <sheldondaitch at yahoo.com>
> *Cc:* tony.podrasky <tony.podrasky at gmail.com>; greenkeys <
> GreenKeys at mailman.qth.net>; Pete Lancashire <pete at petelancashire.com>
> *Sent:* Friday, June 15, 2018 9:55 PM
> *Subject:* Re: [GreenKeys] 28 typer with a pretty full stunt
>
> On Fri, 15 Jun 2018, Sheldon Daitch wrote:
>
> > Jim, the question regarding the FAA, for maybe I am misreading your
> > comment.  If they never had a machine off
> > sequence, eventually all the machines would be on and running.   How were
> > the machines turned back off?
>
>
> The FAA had two distinct roles for 28 RO machines.  One was to copy all
> traffic on the circuit, such as weather reports.  The other was to copy
> only traffic directed to the stations, such as flight plans.  To allow
> a spare machine to be used in either role there was a solenoid mounted on
> the left end of the machine that would override the selective calling and
> allow everything to be printed.
>
> In the selective calling role a machine receives a start-of-address
> sequence which allows the stuntbox to respond to call directing codes.
> Receipt of a CDC puts the machine into a printing condition, or leaves
> it non printing.  An end-of-address sequence causes the stuntbox to
> ignore call directing codes.  And an end-of-message sequence causes
> the machine to go into non-print and to respond to call directing codes.\
>
> This may or may not be explained in the stuntbox brochure.
>
> The FAA used nonprinting sequences for some of these functions.  I forget
> which did what, but sequences like CR-CR-LTRS was one and FIGS-CR-LTRS
> was another.
>
-- 
Nick England K4NYW
www.navy-radio.com
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