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> _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
