[GreenKeys] series of "N"'s

[AA8K73 GMail]

I guess I'm dense; I don't see anything unique about


ZCZC

10001
01110
10001
01110

and

NNNN

00110
00110
00110
00110


I mean, how is that different from, say,

AMAM

11000
00111
11000
00111

and

IIII

01100
01100
01100
01100


Now,  null  and  shift-to-letters  are unique,
but would not be used for signaling due to
their special functions.


On computers we used to send a series of nulls
on the head and Ltrs on the tail.  We could
write info on the unpunched area.


I was always impressed with the pattern of
RYRYRY on PPT.



On 08/15/2011 01:12 PM, NNN7DXB at aol.com wrote:
> Look closely at the tape punch holes in a tape bearing either ZCZC or
> NNNN - they are unique, and are easily recognized, understood and
> memorized by tape relay operators, as their hole punches are ordered.
> (In the early days, tape punching equipment did not feature printing
> on the tape; you had to memorize the hole punches. In later years,
> tape printing became the norm, but the ZCZC and NNNN continued
> in use).
>