[GreenKeys] reperf turn on/off

[Russ Miller]

Take a look at the "Selective Calling" sections of this document:

http://www.rtty.com/development/books/stuntbox.pdf

It is covered with graphics in great detail on pages 4, 16 and 17.


Russ WA3FRP

On Mon, Feb 25, 2019 at 4:22 PM Sheldon Daitch via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Steve,
>
> Way back when Voice of America had the RTTY traffic schedules, pre-email
> days, we used FAXFAX for the start convention and NNNN for the end of
> message for the punched tape traffic.
>
> At least that is what was in the typed information.  I think the tape
> punch actually started on FAX, but by sending it twice, we had a bit of
> redundancy.
>
> As for the tape punch stop, I think it was actually coded for three NNNs,
> but having four of them was a bit more reliable to stop the tape punching.
>
> As our Greenville TTY operation was totally manual, we didn't need to be
> able to read the tapes for destination, for our network distribution was
> fairly small.
>
> When we were handling message traffic, the NNNN did stop the tape punch.
> All of the tape punches were chadless, and our operating procedure
> was to pull about a foot or so of blank tape out of the punch, so we had
> plenty of blank tape between incoming messages.  Our procedures for
> our incoming traffic from overseas was to clean up the messages and we had
> an extra M-28ASR which was used to repunch the incoming traffic
> and clean up the errors.  Some days, we had really good HF propagation and
> we'd have all the DC bound traffic cleaned up almost by the end of
> the RTTY schedule, some days, it would be two or three hours before we had
> all the traffic cleaned up and sent to DC.  Propagation and volume.
>
> 73
> Sheldon
>
> ------------------------------
> *From:* Steve Garrison <steve.n4tty at gmail.com>
> *To:* Ken Stritzel <stritzel at svs.com>
> *Cc:* greenkeys at mailman.qth.net
> *Sent:* Monday, February 25, 2019 3:22 PM
> *Subject:* Re: [GreenKeys] reperf turn on/off
>
> I thought the sequences ZCZC and NNNN were just used to indicate the
> beginning and ends of messages since the "hole" patterns were easily
> recognizable by the "tape apes" having to handle all the tape messages.  I
> don't recall any of the machines that I worked on turning on with ZCZC and
> off with NNNN.  At least in the comm centers I supported.  Although that
> number was rather small when compared to all the comm centers in all
> branches of the military back in the mid 60s!
>
> Steve G./N4TTY
> Sent from my iPhone
>
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