Hi Joe,

thank you for your answer.

> The second sentence of the section from which you quote advises the 
> interested user to read the full detailed description of the protocol in 
> a paper published in the ARRL journal QEX:
> http://physics.princeton.edu/pulsar/K1JT/JT65.pdf
> You will find the description you are looking for at the top of page 8.

You are right. The only reason why I spoke about the potential documentation 
update is that also the original paper speaks about the rounded value 2.6917 
while the precise value is 11025/4096, which indicates a nice relationship 
between the symbol duration and the frequency step (equal to the symbol rate).

> Incidentally, the right-parenthesis in your expression
> "1270.5 + (11025/4096) × (2 + N × m) Hz"
> is misplaced.  Your formula should read
> "1270.5 + (11025/4096) × (2 + N) × m Hz"

My fault. In fact, the most illustrative way to show how the frequency is 
calculated is to define a frequency step:

Δf = (11025/4096) × m

Then the symbol tone frequency is:

1270.5 + Δf × (2 + N)

Everything is clear now.

Thank you

Tomáš
OK2TKB
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