[time-nuts] Re: Custom Quartz crystals

[Hal Murray]

Richard (Rick) Karlquist said:
> We actually used the upper turnover because the E1938 had to operate at
> ambient up 85  degrees.  BTW, the E1938 crystals had to be calibrated for
> 10.000000 MHz at series resonance, unlike the 10811 crystals which were
> calibrated for 20 pF (IIRC). 

How big is the difference between series and 20pF compared to the tuning range?


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