[time-nuts] Frequency processing scheme of HP5065 vapour rubidium standard

[Ulrich Bangert]

John,

> offset that changed annually.  IIRC, it was typically something like 
> 300x10e-10.

Agreed! And that is what the manual says its good for! 

However, the question remains why different physics packages need
DIFFERENT thumbwheel settings in order to achieve the SAME time scale.

73 de Ulrich, DF6JB

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von John Ackermann N8UR
> Gesendet: Montag, 6. November 2006 17:12
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Frequency processing scheme of 
> HP5065 vapour rubidium standard
> 
> 
> Ulrich Bangert wrote:
> 
> > Agreed! But you are talking about things that happen INSIDE the 
> > physics package, don't you? Ok, let us assume that there WERE big 
> > differences in the physics packages that need to be 
> compensated for. 
> > In THIS case the tunable synthesizer would indeed make 
> sense and even 
> > more the printed synthesizer settings on the physics 
> packages! If this 
> > were the only information available, i would immediatly 
> agree to you!
> 
> Ulrich, one thing that hasn't been mentioned is that back in 
> the ancient 
> days, before leap seconds, UTC was "corrected" by applying a 
> frequency 
> offset that changed annually.  IIRC, it was typically something like 
> 300x10e-10.
> 
> I think the main use of the adjustable synthesizer was to 
> allow you to 
> dial in that offset.
> 
> I believe that in later versions of the 5065A, the thumbwheel setting 
> was removed because after leap seconds came along the need to 
> adjust the 
> frequency annually went away.  My 5065A is a very late one 
> and I don't 
> think it has those thumbwheels (but I'm not going to take it 
> out of the 
> rack to find out...).
> 
> John
> 
> _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com 
> https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts
>