[time-nuts] LTE-Lite module and the pendulum...
djl at montana.com
Tue Oct 21 15:08:36 EDT 2014
Also have this problem with capacitor-adjusted tuning. No matterhow careful
you turn, stiction causes the adjustment to jump in the direction of the turn.
>> Great insight thanks. You nailed it: out with the old oscillator and in with
>> that doesn't have that problem.
>> Btw the mechanical tuning issue you mentioned is essentially the same exact
>> problem: even the slightest turn will make the frequency jump too high or
>> low. It can drive you (and the loop) crazy trying to get it on-frequency.
> Whenever I've seen this behavior, it has always been caused by uncertainty or
> "quantization" on the part of the trimpot's wiper, rather than anything that
> could be blamed on the varactor. What would be a good example of a TCXO or
> OCXO model that exhibits EFC hysteresis? I don't immediately understand what
> could cause this phenomenon, and I'd like to reproduce it here to see what's
> -- john, KE5FX
> Miles Design LLC
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