Remember that what you have set is a fixed number representing the TCXO
frequency that is correct only at the time you adjusted it. The reason
being is that the TCXO frequency drifts. Mine will move +48Hz from a
cold start to plus four hours. Thereafter is hardly moves. This drift
will result in the display frequency and the true frequency diverging.
In my unit I have concluded that setting REF CAL after about an hours
warm up is a reasonable compromise. However, I guess not all TCXOs will
drift the same way or at the same rate.
The biggest driver is likely front panel temperature because the TXCO is
located within that environment. My K3 front panel is pretty loaded with
the sub RX dsp board and the DVK. It increases from +24C at switch on
and reaches +39C after a couple of hours. This is easily recorded and
from that you can judge what would be a suitable warm up period before
doing the Method 2 calibration.
All this was determined when I started using a 10MHz GPS disciplined
reference and the K3 REF LOCK option.
Regards,
Mike VP8NO
On 19/01/2019 22:36, Richard wrote:
To all who jumped in to help — thanks.
I just performed Method 2 as found on page 53 of the K3s Owner's Manual, and it
made a huge difference all around. Wish I could paste it here.
Cheers!
Richard Kunc — W4KBX
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