[time-nuts] Basic question regarding comparing two frequencies

Leigh L. Klotz, Jr. WA5ZNU Leigh at WA5ZNU.org
Mon Jul 26 19:26:28 EDT 2010

> I use Peter G3PLX's SBSpectrum as the analyser, where you can trim the
> sample rate in tiny steps. It also has a frequency resolution of 25mHz,
> which is more than adequate for HF. My combination has won FMCs, but I
> still can't resolve 0.01Hz off-air.
> 73,
> Murray ZL1BPU

You might also take a look at fldigi.  It uses libsamplerate for
conversion so you can do +/- ppm correction on the sound input, and also
offers a tracking frequency measurement mode.  A couple of years ago, I
calibrated my radio clock against WWV at 10 MHz, then applied the
resampling correction to get the sound card right, and then placed highly
in the ARRL 7 Mhz FMT using this method.


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