"I don't think it would be technically very difficult to do something equivalent to P3 with sound cards. I think that it would even possible to do much better with, for example, multi-users protocol."
RFSM8000 has come as close as anything so far, but it's weakness was operating well under poor conditions (read normally poor these days) "The problem is the time necessary to do this. An amateur can work (with pleasure and passion of course), let's say a day per week, when a company can make work a small team 5 days a week. Now an amateur project must be short in time (several months at a maximum) as it is done for fun. Working on the same project during years seems very difficult (and surely boring) for amateurs." No kidding.. it is amazing and very appreciated with what you and other software authors have done, and is especially important when it is done as a hobby. "Another point is that the number of Hams really interested in ARQ modes is very weak..." I can't answer that , outside of the fact there are a pile of winlink users. Think you might underestimate the number of folks interested in ARQ soundcard modes, and maybe this is an opportunity for Andy to do a survey on his website? "Note: have tests on the minimum S/N versus the data rate done, for pactot P2 and P3? (as it is difficult to trust commercial data) " don't know, but think so . but my ear tells me it works better than OLIVIA, which is about the top of the heap right now. I cannot hear the other station and yet the connect runs at fast speed. John VE5MU
