The other day I got myself a GPS-disciplined frequency reference and
started going through
my rigs, calibrating them one by one.
When I came to my KX2 I quickly found that the reference frequency
oscillator calibration
procedure, as described in the manual, does not work. (To be really sure, I
even downloaded the
latest version from Elecraft's web.)
What is not mentioned in the manual is that it is necessary to activate APF
(to get the
1Hz VFO resolution) or the auto-spot part of the procedure will go astray
and you will
end up worse off than before.
Also, even with APF enabled, REF CAL is only 7 digits, not 8 as stated in
the manual.
Although not an error per se, I found that since the radio's auto-spot has
a small hysteresis
(a 2-3 Hz with high resolution tuning) you can do much better by adjusting
REF CAL
manually, simply turning the VFO knob. With such manual adjustment I was
able to adjust my KX2 to
an impressive accuracy of 0.04ppm (which of course may not hold over all
temperatures and
supply voltages.)
Have I missed something or have others made the same observations?
Or is it just another case of documentation not keeping up with firmware
updates?
73,
Björn SM7IUN
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