Joe Taylor <j...@princeton.edu> writes: > N1DAM wrote:
>> How bad is it for someone to choose not to use KVASD? Does it cost them >> decode performance, or CPU time, or both? Or is it really not a >> feasible choice? The documentation I've found doesn't address this; it >> just says "go get this non-free code, with an implicit "assuming it's >> available for the os/version/cpu that you want to run it on"". > WSJT-X works well without kvasd. The program has a built-in > hard-decision Reed Solomon decoder. The patented soft-decision decoder > implemented in kvasd with proprietary code is about 2 dB more sensitive. > > At HF one might consider a 2 dB penalty rather moderate. But for EME, > the purpose for which JT65 was originally designed and now widely used, > those 2 dB are very important. 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.) 73 de n1dam
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