[GreenKeys] TTY protocol

[Dave Meier]

I found a wikipedia entry which explained this.  It also said that the NNNN
punched hole pattern was just a series single hole punches to be easily
identifiable to the operator as the tear point.

Dave Meier N4MW
www.n4mw.com

----- Original Message ----- 
From: "Duncan M. Brown" <duncanancy at earthlink.net>
To: "Jerry Barnish" <jrbarnish at DRPA.ORG>; <greenkeys at mailman.qth.net>
Sent: Sunday, August 17, 2008 10:56 AM
Subject: RE: [GreenKeys] TTY protocol


> "ZCZC" indicates "start of message" and was originally used in military
TTY
> torn-tape message relay stations.  "ZCZC" is like "RY" in that punches all
> five holes and is easily identified by an operator or automatic equipment.
>
> Likewise, "NNNN" was used to indicated the end of a message (maybe because
> it sounds like "end"?).
>
> I'll have to do some more research, but I believe these indicators were
> first used by the AN/FGC-1 Tape Relay equipment in WWII.  They are still
> used today, though in ASCII format by many automated message systems.
>
> 73 & have fun,
>
> Duncan Brown, K2OEQ
>
> Chief TTY operator & repairman
> AWA Electronic Communication Museum
> http://www.antiquewireless.org/
>
>
> > [Original Message]
> > From: Jerry Barnish <jrbarnish at DRPA.ORG>
> > To: <greenkeys at mailman.qth.net>
> > Date: 15-Aug-08 07:57:02
> > Subject: [GreenKeys] TTY protocol
> >
> > Gentleman:
> >
> > I am a ham for 33 yrs and am experienced with tty operations to a point
> > of being
> > just a bit past neophyte.
> >
> > What is the meaning of "NNNN" and "ZCZC" at the ending of a message?
> > I notice the long term users adding it and also on German Meteo msgs
> > and have not yet taken the time to research it as of yet.
> >
> > I also agree that the fascination of watching the units print has never
> > become
> > boring. The public has no appreciation of the history behind the units
> > and I also agree that it needs to be preserved forever.
> > Fortunately, the Battleship New Jersey is giving me the opportunity to
> > learn
> > much more about teletype now then I did when I was active on local
> > VHF nets in the 1980's.
> >
> > Thanks for all of the infornation posted on this net.
> >
> > Jerry WB2CAK
> > _______________________________________________
> > GreenKeys mailing list
> > GreenKeys at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/greenkeys
>
>
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