[time-nuts] Re: pulling some crystals

[glen english LIST]

Well today Bob, I find hysteresis, retrace, and spurious modes all 
affected by pulling the temperature all over the place ( as an attempt 
to get another handle of control) .  Ands different starting behaviour 
at temperature spots. golly.

Propensity of spurious modes (my 3OT xtals) seems to be dependent on 
temperature, also. golly.

This is tough. Might just have  tweak  in there that gets adjusted every 
few years.

Holding it over a narrow temperature range (without the intention of 
stability) appears to improve behaviour of hysteresis, retrace and 
spurious modes, at least over a few hours.

IE by holding it in a in a small temperature range, I reduce the number 
of things that can affect the outcome.

Time to go back and read some more Rubiola.

Bob, I built your low noise oscillator for a fundamental AT xtal. 
Reduced bad behaviour, but more noise than the overtone crystal.

Geeez who would build crystal oscillators for a living ????

glen

On 12/12/2023 11:00 am, Bob kb8tq wrote:
> Hi
>
> When you change the oven temperature you get both first and second 
> order temperature effects. You also impact the degree aging has 
> “settled out”.