[GreenKeys] RTTY confusion

[Nick England]

I have inserted answers below (and probably goofed somewhere according to
Murphy’s Law). You might want to look at this booklet which may help.
http://www.samhallas.co.uk/repository/telegraph/introduction_to_RTTY.pdf

Cheers
Nick K4NYW

On Tue, Aug 24, 2021 at 6:04 PM steve bennett via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Hello,
>
>   I have been Googling all day and finding conflicting information.
> Maybe someone can set me strait.
>
> I have the following questions about 45.45 Bd 170 split RTTY.
>
> 1) Does a hole punched in a tape represent mark or space?
>
mark

> 2) Which is a one and which is a zero? mark or space?
>
mark=1

> 3) What are the tone frequencies for mark and space? (I see NEW and OLD
> mentioned)
>
for ham use 2125 is M, 2295 is S. When transmitted in LSB, Space is then
the lower RF freq, hence LSMFT “low space means fine teletype”

> 4) How many seconds is a mark or space? (at 45.45 Bd)
>
1/45.45 = 22 msec

> 5) How many seconds is a stop bit?
>
usually 1.42x22 msec. 7.42 unit code.
For 7.00 unit, then stop is 22msec

> 6) When I look at a Baudot chart and see A = 11000 which bit is sent first?
>
the leftmost 1

>
>
> Thanks,
> -Steve
>
>
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-- 
Nick England K4NYW
www.navy-radio.com
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