[time-nuts] Z3805 initial behaviour after power up

Ulrich Bangert df6jb at ulrich-bangert.de
Wed Jun 17 04:52:06 EDT 2009


John,

> Any OCXO that has been sitting around for years is likely to 
> undergo rapid aging when you first bring it up.  

Sure! I had better formulated my question like: A constructor of a GPSDO
knows, that any OCXO that has been sitting around for years is likely to
undergo rapid aging when it is first brouht up. When Symmetricon choosed to
switch to a long time constant early after power up, were they perhaps
expecting a lower OCXO drift than I am observing now?

73s Ulrich DF6JB

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von John Miles
> Gesendet: Mittwoch, 17. Juni 2009 10:25
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Z3805 initial behaviour after power up
> 
> 
> 
> > Since I do not have an manual for the Z3805: Can any of you Z3801 
> > owners second this behaviour to be normal or would you 
> think that it 
> > is kind of special for the Z3805 or even a real malfunction (in the 
> > sense that the OCXO's drift is above the specs in the beginning)?
> 
> Any OCXO that has been sitting around for years is likely to 
> undergo rapid aging when you first bring it up.  It will be 
> so far out of spec that I wouldn't even bother looking at the 
> loop behavior until it's been running for a week or two.  
> Chances are it'll be fine by then.
> 
> -- john, KE5FX
> 
> 
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