Posted by
Dan Barker on
Dec 24, 2006; 2:49pm
URL: http://elecraft.85.s1.nabble.com/K2-frequencyh-stability-tp442294p442299.html
You don't mention what you mean by "master frequency" nor how you measured
the drift, but I believe you've misunderstood the purpose of the 4MHz
oscillator. It is used to program the lookup tables for frequency
generation, but during normal operation it's exact frequency does not
matter.
So, you should set C22 as accurately as you can and immediately run CAL PLL
and CAL FIL and then ignore any drift.
If you measure the actual performance of the radio, you should see 100 Hz
drift maximum. I've never heard anyone say what the drift of the 4MHz
oscillator might be, but since it doesn't matter - who cares?
Or did I understand you wrong?
Dan / WG4S / K2 #2456
<snip> the master
frequency drifts as a function of temperature. From an
ambient temp of 65F to max rig temp when the KPA100 fan
kicks in the receiver may drift by 800 Hz.
</snip>
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