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

[Brian Kirby]

The offsets were determined by BIH for UTC as ;
1960, 1961   -150 x10-10
1962-1963   -130 x10-10
1964-1965   -150x10-10
1966-1971 -300x10-10
and in 1972   -0-
"the offset in clock rate was chosen to keep the UTC clock in reasonable 
agreement with ET" (Chapter 1 - NBS Monograph 140)




Ulrich Bangert wrote:
> 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
>>
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>>     
>
>
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