> Up to PSK31, you can see this phenomenon. But if you increase the speed (PSK63), you decrease the sensitivity to Doppler but also increase (with 3 dB) the minimum S/N. All is a question of compromise.
Yes, my point was that adding convolutional encoder, coding gain could somehow eliminate the 3db S/N loss of double bandwidth. > For comparison of modes, I think it would be, ideally, interesting to normalize to the same text throughput so to be able to consider all the parameters of the performance, as for example, the degree of redundancy introduced by the mode (example MFSK16 or PSK63F: 2, Olivia: about 9). This because if, for example, MFSK16 would be transmitted at the same throughput as Olivia 32/1000, its minimum S/N would be 3 dB better that the present S/N (-16,5 dB instead of -13.5 dB). Thanks for that note. In my opinion Olivia trades easy tuning against decreased speed and S/N capability if compared to MFSK16. 73, Vojtech OK1IAK
