I used my K3 in the ARRL FMT [1] and calibrated it against 10Mhz WWV
just before.
I listed on 40m only, and measured two of the four signals I copied
within 1Hz. The other two were <2Hz off [2].
Interestingly, although I was off by >1Hz in two of the measurements, I
was off <1Hz in the difference frequencies because of cancellation of
errors.
For software, I used fldigi [3], a digital mode program which is now
available on Windows as well as the tried-and-true Linux version.
[1] http://www.arrl.org/w1aw/fmt/
[2] http://www.b4h.net/fmt/fmtresults200811.php
[3] http://w1hkj.com/Fldigi.html
Leigh/WA5ZNU
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