A quick
search will turn up many. Here a few to get started:
Graham,
OK:-)
But as you say only these specialised programs have compensation. I think this is either for when the card crystal is used as a frequency counter reference or in order to allow for differences between the soundcard and the computer system clocks when this can affect the program output.
WSPR will be looking the 4 tones which might themselves be varying due to propagation and/or TX/RX drift. It is not looking for precise frequencies, just tones separated by approximately the WSPR standard.
SpecLab is a complex program, maybe there is a way to compensate for sample rate and send the corrected audio to WSPR.
Or, how about using VAC? The in/out sample rate can be compensated, would that work?
As I said, I'm amazed at the computer power used for WSPR analysis. In my opinion there is so much variation in propagation and probably in the way WSPR finally decides to present a low SNR that low SNRs will not be reproducible. (I think this is basically what G3ZIL says?)
Certainly it seems propagation affect things, several times I have compared two RX systems, one clearly wins over one day, the other one wins the next day. Or, are these just random variations?
Even two seemingly identical RX systems will have small differences which could affect weak signal decoding.
73 Alan G4ZFQ
If you have ever used FLDIGI to decode WEFAX images you will be aware of
the image slanting one way or the other til you have it calibrated.
www.wb1gof.org/files/FrequencyCalibration.pptx
That is all find and dandy if there was a way in WSPR or WSJT-X to
correct the sample rate t
