[time-nuts] Jupiter modules: 1pps or 10kHz to lock an OCXO ?

Didier didier at cox.net
Mon Dec 22 00:02:40 UTC 2008


Patrick,

This has been covered extensively in recent past (this year). A quick look
through the archives will tell you more than you bargained for...

Didier 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Patrick Reynaert
> Sent: Sunday, December 21, 2008 4:13 PM
> To: time-nuts
> Subject: [time-nuts] Jupiter modules: 1pps or 10kHz to lock an OCXO ?
> 
> Hello,
> 
> 
> Using the 10kHz output to lock an OCXO is common practice and 
> seems to give good results. 
> 
> Has anyone tried to use the 1pps output? One? could first 
> make a simple divider to create a 0.5Hz reference with 50% 
> duty cycle, and then use this signal to lock an OCXO. This 
> would also allow the use of other OEM GPS modules that don't 
> have the 10kHz but only the 1pps signal.
> 
> Of course, as the 0.5Hz signal is much lower in frequency 
> than 10kHz, the short-term stability is pushed more to the 
> OCXO, making the requirements of the OCXO even harder.
> 
> But maybe the 1pps signal has better stability than the 10kHz 
> signal? Or is this the same since these signals will only 
> influence the long-term stability of the oscillator and have 
> the same accuracy?
> 
> Any thoughts are highly appreciated.
> 
> Thanks,
> Patrick.
> 
> 
> 
> 
>       
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