[time-nuts] 5061 Cs frequency shift with long time constant?
cfharris at erols.com
Wed Apr 6 10:11:16 EDT 2005
John Ackermann N8UR wrote:
> Thanks, Tom. That's another excellent point. The long term stability
> impact of this cap is worth considering.
> Following up on Brian's comment yesterday, I'm investigating sources for
> very low leakage caps. If I find some, I'll let the group know, and if
> there's a minimum purchase quantity that's reasonable, I may just buy a
> bunch and make them available to the group here.
> buehl wrote:
>> If circuit has an electrolytic, following may influence how/ when you
>> Electrolytics change value and leakage with no voltage applied for
>> long periods. So if the long TC cap has been switched out for months
>> it will need a long time with "in circuit" to stabilize again. The
>> electrolytic barrier "forms" as a result of the electric field across it.
>> Tom Buehl
Given the easy availability of mylar caps in the 1 to 10uf range, I highly
doubt that such an important task would be given over to an electrolytic.
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