[time-nuts] Z3805 initial behaviour after power up

Brian Kirby kilodelta4foxmike at gmail.com
Wed Jun 17 19:50:46 EDT 2009


They do not talk about driving the frequency off, but they warn to keep 
the receiver locked the first 24 hours, so it can determine how the 
oscillator ages.  Its in the section on "holdover" (page 52 of the PDF , 
page 3-8 of the user guide).

You may also want to search for HP An1279, it also goes over HP 
smartclock operation, and look for a paper titled "the Global 
Positioning System and HP SmartClock" by John A. Kusters.

If you have a broadband connection, I can email you each one, if that 
will help.

Brian

Ulrich Bangert wrote:
> Brian,
>
> thanks for your information!
>
>   
>> algorithm.  From what I read about the smart clock, it takes 
>> 5 days for it to complete its initial learning cycle and then its
>>     
> continuously 
>   
>> refining.
>>     
>
> Is that from the Z3801 manual, which I have available, or do you have any
> other in depth information source?
>
> Best regards
> Ulrich 
>
>   
>> -----Ursprungliche Nachricht-----
>> Von: time-nuts-bounces at febo.com 
>> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Brian Kirby
>> Gesendet: Mittwoch, 17. Juni 2009 16:58
>> An: Discussion of precise time and frequency measurement
>> Betreff: Re: [time-nuts] Z3805 initial behaviour after power up
>>
>>
>> Ulrich,
>>
>> I have two Z3801A and both of them act close to what you 
>> describe in the 
>> first 24 hours of power up.  I believe its part of the disciplining 
>> algorithm.  From what I read about the smart clock, it takes 
>> 5 days for 
>> it to complete its initial learning cycle and then its continuously 
>> refining.
>>
>> Brian
>>
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