Hi Rick, Cannot comment on DominoEx performance on 6 meters as noone ever answers me (marginal station here so no surprise). I find it to be a very good performer on the lower bands...I am a horrid typist (as many can attest) so I tend to stick to 11 baud. The use of FEC seems to minimize hits under less than ideal conditions (as one would expect). It remains my mode of preference for 80 meters due to its robust nature and bandwidth (although MFSK16 and Olivia have their virtues).
73 es be well, Bill N9DSJ --- In digitalradio@yahoogroups.com, KV9U <[EMAIL PROTECTED]> wrote: > > I just got off the air with a "local" station about 35 miles north of > me. This is our second test, last week we did the first one. We expect > to try more modes each week. Tonight we started out on 6 meters PSK31 > and switched to Domino EX 11. Big surprise. DEX seems to have great > difficulty with rapid doppler from aircraft reflections. Lots of errors. > This was also evident in the audio and on the waterfall. At one time I > even copied two waterfalls running parallel to each other when the worst > of the reflections were evident. We tried a faster mode with FEC and it > may have performed slightly better but I can not say for sure. > > What mode would be the very best one to handle this kind of of doppler? > > Then we moved to 80 meters. Surprisingly, even at 7:30 PM local time, we > had outstanding signals on 80 meters running 25 watts. I copied him at > 20 to 30 over S9 with noticeable rapid QSB, and he copied me about 15 > over. Pretty good for that time of night, so the band must not have gone > long then. Right now, the FoF2 is supposed to only be 3 MHz for our area > and it is about 45 minutes since we tested on 80. Good copy with DEX11/FEC > > Then on 160 our signals were only S9 although pretty solid. Just not as > loud as it was on 80 meters. I expected it to be a bit better but then > again we were running much less power than you would normally do for > this band if you wanted to participate in a voice roundtable. > > The DEX11/FEC signal was a bit slower than we wanted so we decided to > move to DEX22 without any FEC at all. Of course the speed is very fast. > And neither of us could detect any hits at all! That was very > impressive. If there had been a lot of QRN, then I would have wanted to > kick in the FEC as I have found that the FEC is not only good for weak > signal, but it really does seem to work better under difficult > conditions, even with reasonably strong signals. I especially like it > because unlike the nightmare I have been having with tuning in MFSK16, > it is not real critical for accurate tuning and it gives you several > choices of speeds and the ability to use the FEC or not. The FEC of > course cuts whatever speed you were using in half to handle the overhead. > > Anyone else doing anything with DEX lately and can report on how it > performs on various bands? > > 73, > > Rick, KV9U >
