On 14/12/2015 08:51, Игорь Ч wrote: > As RR73 in the free message box has lack of compression and forward > error correction Hi Igor,
that is not correct. All messages in the HF implementation of WSJT-X have the same degree of FEC and some compression mechanism. The compression is higher with the standard form messages because the components are treated specially, this does not change the probability of their being decoded it simply allows more that 13 characters to be encoded within the constraints of the fixed standard message forms. In the VHF & up mode JT65 short codes may be selected and that causes special tone patterns to be used that do have a higher probability of being decoded from shorter incomplete periods of reception. I think I have that right, I defer to Joe K1JT if not. As I see it, all these proposals to use various free text message forms to try and shorten QSO exchanges are flawed in that they cannot handle all the call sign formats that the standard messages can. This means that even more special cases have to be introduced to cater for completing QSOs with these edge case call signs involved. 73 Bill G4WJS. ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
