[time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit

Ulrich Bangert df6jb at ulrich-bangert.de
Sat Dec 16 15:34:02 EST 2006


Hal,

> Do I have to get a cesium clock so I have a better reference?

In the last consequence: I fear, yes! A disciplined H2 Maser might even
be the better choice.
 
> But then how do I tell how good my cesium clock really is?

The manual tells you. If you don't believe the manual ask TVB as a
second source. 

Best regards
Ulrich Bangert, DF6JB

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Hal Murray
> Gesendet: Samstag, 16. Dezember 2006 21:23
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS 
> locking circuit
> 
> 
> 
> > You still want to produce some form of quality measure for the ADEV 
> > shape in order to form some form of control loop.
> 
> Suppose I build I good GPSDO.  How do I determine how good it 
> is?  (or even 
> if it is any good)
> 
> How much do I learn by just plotting the control voltage?
> How much do I learn by comparing it with a good 
> non-disciplined crystal?
> 
> 
> Do I have to get a cesium clock so I have a better reference? 
>  But then how 
> do I tell how good my cesium clock really is?
> 
> 
> 
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
> 
> 
> 
> 
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