Joe Taylor <j...@princeton.edu> writes: > Hi Greg, > > N1DAM wrote: >> ... >> Thanks for the explanation. It would be good to have that be readily >> understandable by someone starting at the web site and trying to >> understand everything. Perhaps the "now go install kvasd" section could >> turn into an "optional/recommended" section, with that explanation. (In >> addition, I've never been clear on whether WSPR needs or can use kvasd.) > > The Koetter-Vardy Algebraic Soft-Decision algorithm is for decoding > Reed-Solomon codes. Of all the WSJT-related modes (FSK441, JTMS, ISCAT, > JT6M, JT4, JT9, JT65, WSPR), only JT65 uses a Reed-SOlomon code. > > Modes JT4, JT9, and WSPR also use strong FEC (forward error correction), > but they use a convolutional code for which an open-source soft-decision > decoder is provided. > > Program kvasd would be of no use whatever for JT4, JT9, or WSPR.
Thanks for the explanation. That might be a good parenthetical note near the download info about kvasd. It may be me but I've long been confused on the above points.....
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