[time-nuts] time-nuts Digest, Vol 43, Issue 35

Didier Juges didier at cox.net
Thu Feb 14 18:26:32 EST 2008


Martyn,

What is the type of oscillator used as the frequency reference of the SR620?
How is it characterized?

Didier KO4BB 

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Martyn Smith
> Sent: Thursday, February 14, 2008 11:36 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35
> 
> Pete,
> 
> That's my point.
> 
> Tom has plotted Allan Variance.  I have plotted frequency accuracy.
> 
> I get similar Allan Variance results to Tom.  But if I just 
> measure the accuracy, e.g peak to peak frequency variations, 
> rubidium's out- perform OXCO's even when both are disciplined to GPS.
> 
> I hope I'm not being stupid here.
> 
> I measure frequency accuracy using my Stanford SR620 in time 
> AB mode and calculate the frequency error.  My accuracy floor 
> noise is 2E-11/sec.
> 
> When measuring an OXCO based unit I often get frequency 
> errors of plus/minus
> 5 milli hertz.  Rubidium units (mine and Symettricom) never 
> has errors > 1 milli hertz.
> 
> Best Regards
> 
> Martyn
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, 
> go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> 
> No virus found in this incoming message.
> Checked by AVG Free Edition. 
> Version: 7.5.516 / Virus Database: 269.20.5/1279 - Release 
> Date: 2/14/2008 6:35 PM
>  
> 

No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.516 / Virus Database: 269.20.5/1279 - Release Date: 2/14/2008
6:35 PM
 




More information about the time-nuts mailing list