[GreenKeys] Radio up and working... Question...

[WA5CAB at cs.com]

Lar,

As someone else already said in part, the 5-unit or 5-level asynchronous 
Baudot teleprinter code has five information bits, a start bit and a stop bit.  In 
most Model 14/15/19/20/26/28 machines, the stop bit is longer than the other 
six.  For nominal 60 wpm machines the stop bit is 31 ms.  The others are 22 
ms.  So the length of one character is 163 ms.  If the average word is taken to 
be five letters long plus one space, the average word is 978 ms long.  There 
is a little overhead in the CR and LF after each line of printing so that after 
several lines the average word time grows to nearly one per second or 1000 
ms.  And one word per second is 60 words per minute.  

The published or stated baud (bit per second) rates ignore the length of the 
longer stop bits and are simply the inverse of the bit length.  22 ms inverted 
is 45.4545... 

If you run the same calculations against all four common speeds, you will see 
that it takes slightly different assumptions and fudge factors to get the 
nice neat numbers.  I assume that the engineers involved realized that fractional 
wpm figures would only confuse senior management and rounded everything off 
(or more likely up) to neat short figures.  The published baud rates, however, 
are accurate, at least if you take them out to enough decimal places.

Another figure of merit that seems to have fallen into disuse but used to be 
commonly stated instead of baud rate is Operations Per Minute (opm).  60 speed 
machines run at 368 opm.

In a message dated 11/15/2008 10:30:37 AM Central Standard Time, 
duncanancy at earthlink.net writes: 
> >[Original Message]
> >From: Larry Tighe <larryradio at worldnet.att.net>
> >To: <duncanancy at earthlink.net>; Don Robert House <k9tty at dls.net>;
> <greenkeys at mailman.qth.net>
> >Date: 15-Nov-08 11:13:50
> >Subject: Re: [GreenKeys] Radio up and working... Question...
> >
> >How do you convert Bauds to WPM?  Great list, thanks.
> >
> >lar
> >K2JIA
> >================================
> >Subject: RE: [GreenKeys] Radio up and working... Question...
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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