[time-nuts] LTE-Lite module and the pendulum...

Don Latham 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.
Don

John Miles
>> Great insight thanks. You nailed it: out with the old oscillator and in with
>> one
>> 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
>> too
>> 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
> happening.
>
> -- john, KE5FX
> Miles Design LLC
>
>
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-- 
"The power of accurate observation is commonly called cynicism by those who
have not got it."
 -George Bernard Shaw

Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail:  POBox 404
Frenchtown MT 59834-0404
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com





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