[GreenKeys] Odd Model 15/20 gears

[Sheldon Daitch]

Don,

I can't imagine the AP really cared about being closer
to the European speeds as it wasn't as if the individual
AP members would be sending network wide material
into Europe.

I know there were international links for the AP, but
my guess would be that any stories intended to be sent
on the international side would have been either via
dedicated tape readers (in those days) or dedicated
data ports off computer systems, where the speeds could
be set in software.

I had only limited experience with being in an AP state
bureau, 1978-1979, Raleigh, and the only time I ever saw
anything close to using paper tape for transmission was
associated with the election of 1978.  Tech Charlie
Brown, who had been a tape operator in earlier years,
set up a tape punch for additional elections material and
the output of the TD went into the computer system for
incorporation into the state feeds, SC and NC.  This
method was done because the bureau didn't have enough
electronic terminals and we went to back to a mechanical
input for a special event.

Otherwise, at the state bureau level, I can't imagine the
AP being concerned about European speeds, other than a
study that they work.

73
Sheldon


On 6/1/2011 12:06 AM, DR HOUSE wrote:
> THANKS Jim!
>
> I will not have to go count them now. :-)
> I am wondering how to set the options on Heavy Metal..
> Could AP have wanted to be closer to the European speeds?
>
> Don
>
> On 31 May 2011, at 11:43 AM, Jim Haynes wrote:
>
> So I went out to the Baudy House and counted the gear teeth.  Guess if I
> had done that earlier I could have figured all this out without having
> to
> ask. 114460 pinion has 10 teeth and 114461 gear has 39 teeth.  With an
> 1800 rpm motor that gives a receiving shaft speed of 461.5 rpm.  For 360
> opm, 45.45 baud, the corresponding number is 420 rpm.  So for a 5 level
> machine, taking the ratios of those two numbers gives a baud rate of
> 50 and a character rate of 404 opm, or 67 wpm.  If the 50 baud signal is
> transmitted as 7.5 unit code (European standard) rather than 7.42 then
> the speed would be 400 opm or 67 (rounded) wpm.
>
> I can't do the calculations for 6-level code right now, because I don't
> know if that is transmitted as 8.00 units, or 8.42, or 8.5, or 9.0, or
> something else.
>
> It would be interesting to know why A.P. chose to go from 45.45 to 50
> baud, or 60 to 67 wpm.  If they wanted more speed they could have
> switched to 75 wpm, a standard speed for the Model 15.
>
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