[time-nuts] Man with too many clocks.
kb8tq at n1k.org
Sat Nov 5 08:01:33 EDT 2016
If you use a good wire wound pot and run it off of and oscillator EFC source (not
all have them), the temperature effect is pretty much zero. You are using the pot
as a ratio device.
A mechanical cap that is part of the heated region of the OCXO (the normal case)
has already been taken into consideration when the OCXO set point is adjusted to
> On Nov 4, 2016, at 3:34 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> The only practical way to set the 10811 or 10544 is with a >= 10 turn pot on
>> the EFC. I never have worked out just why there are so many instruments that
>> don’t have a pot on the EFC.
> How would temperature effect that? For that matter, how does temperature
> effect the typical mechanical capacitor? Does anybody play fancy tricks to
> cancel out the mechanical motions? (like the mercury pendulum - as the
> pendulum rod expands the mercury expands in the other direction to keep the
> CG the same)
> These are my opinions. I hate spam.
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