If the sound card does vary from the ideal, doesn't the correction bring it to the correct point? As long as it is within the required + and minus of 200 or so?
By the way, I checked the sound card in my newer HP Computer that is running Vista and the numbers are almost exactly the right ones. In fact, on one test the number was 11025 for the sound card sampling rate. I may have to try out this machine again for my ham activities. Normally, I use a 2.93 GHz emachines computer running XP for that purpose, but as you note, it does have a mediocre built-in sound card. I actually have a Soundblaster Live! card that is not being used, and maybe I can figure out how to get it to work with my emachine. 73, Rick, KV9U Patrick Lindecker wrote: > Hello Rick, > > >MFSK16 which requires even more accuracy I think I read in the help > files, 4 Hz > Yes (and MFSK8: 2 Hz...which becomes a problem). However you can use > the 2 vertical traces in the waterfall displayed at the beginning of > each MFSK16 transmission. Simply make coincide these two traces with > the two vertical fix lines and it will be OK. A RS ID solve also the > problem, as there is an automatic tuning. > > >On thing that would help us is some kind of measurement to tell us when > >we are locked on the phase/frequency OK, similar to the way the earlier > >programs displayed the graphic phase meter on screen when we operated > >PSK31. > It will be theoritically possible by measuring the difference of phase > (after some time as it is MFSK and not BPSK) between the selected > carrier and the carrier received but I'm not sure it will be very > reliable and surely not on weak signal. > > >By the way, once you do the calibration, is there any way to know that > >it was done, other than it indicating the offset that it detected? > >For example, my sound card shows still shows 11101 and 76 Hz offset and > >does not vary much from that when I run the test each time. > I'll see this. > Rick: your sound card is rather not very good...Corrections will apply > but with an old Creative Labs or equivalent, you will be more confident. > > 73 > Patrick > > >
