Another solution is to run G3PLX's PSK31 SB software. There is a
setup routine in the software that allows the Soundcard sampling rate to
be calibrated. The procedure is given in the Help file, accessible from
the menu bar. Again, an accurate audio frequency source will be
necessary.
The vectorscope in that software allows fine tuning accuracy to an
arbitrary audio tone, and frequency resolution of less than 1Hz is
clearly seen. So it becomes a useful tool for measuring carrier
frequencies even if you don't actually want to use the PSK31 data mode.
Andy G4JNT
For those who want to calibrate the soundcard there is also a simple
hardware solution :
Take a CMOS4060 (14-stage divider with internal oscillator)
and let it run
with a xtal in the 8-12MHz range. At the end of the divider
chain (pin 3)
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