[time-nuts] Re: Unstable FTS1050A?

[Bob kb8tq]

Hi

Bad solder joint would be my guess. Possibly on one of the crystal
leads.  Cracks form, whiskers grow. Today it’s fine, tomorrow … not 
so much. 

Bob

> On Apr 25, 2023, at 9:49 AM, AC0XU (Jim) via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Working my way through testing my collection of FTS1050A oscillators, I find one that erratically has poor time stability for tau > 1 sec. In some multi-day tests it is similar to the others (ADEV well under 1e-12 up to about tau = 1000 sec), but during other tests it is about 4x to 10x worse than the others for tau > 1 sec up to about 50k sec.
> 
> If it were consistently bad at higher tau, I would think that the heater has gone. But in about half of the 10 multi-day tests I have done with this unit, the stability appears fine.
> 
> Any ideas about what could cause sometimes good and sometimes not-so-good stability?
> 
> Thanks-
> Jim
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