Hi Joe,
I would like to suggest a minor modification of the JT65 protocol
description.
The current documentation says: "Each channel symbol generates a tone at
frequency 1275.8 + 2.6917 × N × m Hz". Actually the origin of these two
magic constant 1275.8 and 2.6917 is not immediately clear. However, if we
rewrite it as "1270.5 + (11025/4096) × (2 + N × m) Hz" it becomes evident
that:
- everything is derived from the synchronization frequency 1270.5 Hz
- the frequency step is a rational number whose parts correspond to the
value shown before (the symbol duration 4096/11025 seconds)
- there is a single step hole between the synchronization frequency and the
first symbol frequency.
It is also not fully clear why the documentation speaks about the 1270.5 Hz
synchronization frequency while the actual HAM traffic successfully uses
various synchronization frequencies.
Please understand me, the current documentation is not wrong. I am only
describing my problems that occurred when I tried to reconstruct the encoder
behaviour according to the documentation.
Thanks for understanding.
Tomáš
OK2TKB
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