[Elecraft] K2 frequencyh stability

[adamkern at uchicago.edu]

Hello all,

I notice that on K2 #03547 rev B (with KPA100, KDSP2, KSB2, 
K160RX and thermistor installed at time of build) 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.  The range is 
usually more narrow given the typical temp shift experienced.

My solution has been to calibrate C22 against WWV such that 
as the rig warms up, the master frequency set by C22 drifts 
towards zero-beat with WWV.

My question is this: how much drift is typical?

Adam, N1KO