I did not see any response to this but each of the DominoEX modes does have an estimated SNR
For example: DEX4 = -14.5 dB DEX5 = -14 DEX8 = -13.5 DEX11 = -12 DEX16 = -10.5 DEX22 = -9 Add about one 1 db better SNR for using the FEC mode. It does seem that DEX22/FEC works better than DEX11 without FEC in many cases even though the throughput speed is about the same. However, under weak signal condx, I suspect that DEX11 wihout FEC would work deeper into the noise. As I am finding out on many HF circuits, the ability to handle the vagaries of the ionosphere is often more important than the raw ability to handle AWGN. I did think that MT-63 would do better than DEX11/FEC and DEX22/FEC, but it was much worse during the 160 meter test. Signal strengths were generally quite good though and QRN was not too bad considering the time of year here in the northern hemisphere. It will be most interesting to see what happens this summer with static crashes. It just seemed like DEX was able to handle static crashes better than other non-ARQ modes. 73, Rick, KV9U DuBose Walt Civ AETC CONS/LGCA wrote: > Coding Coding >Mode Baud Speed Correction Convolution Interleaving SNR >(in dB) Bandwidth >DominoEx11 10.766 77 WPM No No Not Stated >Not Stated 194 Hz >DominoEx22 21.533 154 WPM No No Not Stated >Not Stated 388 Hz >MT63-1K 10 100 WPM No No Yes > -5 1000 Hz > >Perhaps the bandwidth of MT63 and its SNR threshold may have been the >difference. But I don't know what the SNR threshold of DEx11 and DEx22 are. >Also, they are different types of modulations. > >Walt/K5YFW > > > >
