[RTTY] Why 45.45 baud?

[Kai]

Peter,
Hoff, K8DKC, also includes snippets about FCC regs regarding RTTY. You can follow
why we are where we are with the FCC.

I learned RTTY in the last 5 years from that series, this reflector, and the 
MMTTY reflector.
RTTY has a very rich and interesting history history!

73
Kai

On 4/15/2014 4:51 PM, Peter Laws wrote:
> On Tue, Apr 15, 2014 at 2:14 PM, Kai<k.siwiak at ieee.org>  wrote:
>> 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.
>>
>
> Can't say as I'll read them all but I pulled this one from the archive
> and it's pretty interesting.  About to read about USOS ...
>
>