[time-nuts] Z3816a and newbie questions

[Brian Kirby]

I beleive that HP made some errors when writing the Z3801A manual, or 
they were unclear/grey about some areas.  The spec of 1E10-9 would be 
the oscillator unlocked, probally worse case, temp drift, etc.  The 
basic oscillator is better than this - If you look at the 10811A/B 
quartz crystal oscillator manual, long term drift at 24 hours is rated 
less than 5E-10.  ! second variance is 5E10-12.  Now if we look at 
Mejia-Norton's file "Performance Specifications for HP 10811D/E Family 
Crystal Oscillators and at the 10811-60158 (page 21) specs are coarse 
tuning +/- 5x10E-7, EFC +/-2E10-7 for a range of +/- 5Volts.  Long term 
stability 2.5E-10 per 24 hours after warm up and typical 1E10-8 for the 
year.

When the Z3801A is locked up, it approaches UTC,  parts in low 10E-13 to 
slightly better over 24 hours.

Rex wrote:

>On Sun, 09 Jan 2005 22:28:00 +0100, Alberto di Bene <dibene at usa.net>
>wrote:
>
>  
>
>>  Rex wrote:
>>
>>I downloaded the "Z3801A GPS Receiver User's Guide" from Symmetricon. It
>>has Specifications in section 5. It gives "10 MHz Output
>>Characteristics" as "Frequency Accuracy: < 1 x 10^-9, one day average".
>> 
>>
>>  Doesn't that number take into account also the possibility of an
>>  holdover?
>>  73  Alberto  I2PHD
>>    
>>
>
>Possibly. The manual I quoted from doesn't say more, other than phase
>noise numbers.
>
>I would think that the 10811 should do better than 1 x 10^-9 even
>without adjusting for drift in holdover. This strange documentation is
>one reason I asked my original question.
>
>
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