Hi Alberto,

> please pardon my truly naif question, but, isn't Fano a decoding algorithm for
> sequential
> convolutional coding, while your FT decoder is meant for block RS coding ?
> Do you mean that JT4F doesn't use RS, while JT65C does ?

Yes, JT4 uses a convolutional code with K=32, r=1/2.

For more details see, for example

1. Section 15 of the WSJT-X User Guide:
http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-1.7.0-devel.html#PROTOCOLS

2. A rather old write-up about JT2 (obsolete) and JT4:
http://physics.princeton.edu/pulsar/k1jt/JT2_JT4.TXT

        -- Joe, K1JT

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