Hi Tony, Thank you for the simulation results. I will report any field results for PSKR modes in NVIS conditions.
Regards, John --- In [email protected], Tony <d...@...> wrote: > > John, > > >The Pskmail group certainly report visible improvements in > >sensitivity and QRM handling which is expected with the > > >FEC and interleaver but at the price of speed of course. > >In white noise we see a 4 to 5dB improvement over the >same > >bpsk speed but at 1/2 the data rate. > > That does seem to be the case John. I ran each mode through > the white noise test channel today and found the minimum SNR > figures to be 4 to 5db better with PSK-R. > > Mode Minimum SNR > PSK125 -4db > PSK125R -8db > PSK250 -1db > PSK250R -5db > PSK500 +2db > PSK500R -3db > PSK31 -11db > > >Mind you, most links are established on 30M over most > >likely a single hop (less than 2000 Miles > > >approximately).Would you have a test that simulates these > >conditions as this is what we targeted in the >development > >of the "robust" modes? > > The HF path simulation models are not defined by the number > of hops, but I think it's safe to say that the quiet-day > channel distortion should be minimal on a the single hop > path you describe as long as there's no multipath involved. > In that case, the PSK-R mode should perform better than BPSK > based on sensitivity alone. > > I ran a simple white noise test with the signal-to-noise > ratio set at the minimum SNR established for PSK250-R. The > results are obvious. > > PATH: WHITE NOISE TEST CHANNEL > SNR : -5db > > BPSK250 > the qpicI brown fox jump o aer the lazy dog > the qeeick brown fox jumps over the lazy dog > he qck bsnJox jump e over the lazy dog > the quick own foxtumps oIer the lazb dog > the quick brown fox jumpr ove the lazy dog > te quihk Ûown fox jumus ovet th lazt og > the iopick brown f jumps over t ee lazy d > the quickbrown fox jumGo oÚr the laPy dog > t quick browvioeo jumps over the lazy7og > the qui browi fox jpkoA r the lazy d > t& quick brown fox jpMover t{ lazy dog > > PSK250-R > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dag > the quick bsrown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > the quick brown fox jumps over the lazy dog > > > It seems that only Darko and I have regular NVIS Pskmail > > linkups to our respective servers > > Please keep me informed John -- I'd like to know how well > PSK-R compares to BPSK via NVIS. > > 73, Tony -K2MO >
