Fw: [GreenKeys] TTY protocol

[Dave Meier]

Duncan,

Yes, I didn't bother to fact check the article but was suspicious.  I guess
the pattern would still be easily recognizable by eye.  Perhaps a better
explanation of NNNN will come forth.

Dave Meier

----- Original Message ----- 
From: "Duncan M. Brown" <duncanancy at earthlink.net>
To: "Sam Hallas" <s.hallas at ntlworld.com>; "Dave Meier" <n4mw at msn.com>
Cc: "greenkeys" <greenkeys at mailman.qth.net>
Sent: Sunday, August 17, 2008 5:18 PM
Subject: Re: [GreenKeys] TTY protocol


> Sam: Do  you have any sources for the pre-WWII tape relay & ZCZC uses??
>
> Dave:  I saw that Wikipedia article, too.  However, "NNNN" is not "just a
> series single hole punches"  --  "N" is 3rd & 4th bits.
>
>   --Duncan
>
>
> > [Original Message]
> > From: Sam Hallas <s.hallas at ntlworld.com>
> > To: Dave Meier <n4mw at msn.com>
> > Cc: Greenkeys <greenkeys at mailman.qth.net>
> > Date: 17-Aug-08 16:19:38
> > Subject: Re: [GreenKeys] TTY protocol
> >
> > Dave Meier wrote:
> > >  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, I couldn't find the article. Could you post the link, please?
> >
> > I have a feeling that the use of ZCZC & NNNN predates WWII and most
> > likely started with the cable operators like Cable & Wireless, where
> > torn tape relay was widely used.
> >
> > Cheers,
> > Sam
> >
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>