[RTTY] Why 45.45 baud?

[Kai]

Dennis,
Great question!

See the second installment of RTTY articles by Irvin Hoff, K8DKC,  "Operating 
the Teleprinter",  QST, Feb 1965, pp 29-35. He wrote 13 articles in QST in 
1965-66 on all aspects of RTTY.   the reciprocal of 45.454545... baud (we round 
to 45.45, some EUs use 45 baud)  equals 22 mS, the basic timing interval for the 
teletype code. He also discusses the roots of 1, 1.5, 1.43, 2 pulse stop bit 
intervals.

The series is very interesting reading, and traces the archaic roots from 
land-line tone units today's RF amateur-RTTY standard.

Happy reading,
Kai, KE4PT


On 4/15/2014 2:49 PM, Dennis wrote:
> Where did the 45.45 baud rate come from?
> Some antiquated mechanical usage, or?
>
> Dennis W1UE
>
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