[time-nuts] Z3816a and newbie questions

[Dave Carlson]

Remember that the Z3816 does not have the HP 10811 oscillator -- it has an
MTI260 smaller-format VCXO. Its specs may not be as good unlocked as those
of the HP 10811 series.
Also the specs that Rex quoted are from the Symmetricom manual and not that
of HP.

Dave

----- Original Message ----- 
From: "Brian Kirby" <kirbybq at bellsouth.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, January 09, 2005 3:43 PM
Subject: Re: [time-nuts] Z3816a and newbie questions


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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