[time-nuts] Tbolt temperature sensor
Brooke Clarke
brooke at pacific.net
Thu Feb 5 19:56:06 UTC 2009
Hi Tom:
AFAICR the HP/Agilent GPS receivers compensate for temperature and crystal
oscillator drift when in holdover. You can see the oscillator drift
compensation in the Allan plots on your web page. That's why the HP units have
better performance.
AFAICR Mr. Allan is on contract with Agilent as a consultant and he has a
patent on this concept.
Have Fun,
Brooke Clarke
http://www.prc68.com
Tom Van Baak wrote:
>> The whole purpose of a GPSDO with an expensive double
>> oven OCXO is to provide extremely high quality holdover
>> performance when GPS signals go away. To achieve this
>> level of performance one needs to compensate for the affects
>> of temperature on the parts of the system outside the oven.
>
> Mark,
>
> Is this really true? What is the typical tempco of parts outside
> the oven? Compared to the spec'd tempco of the OCXO itself.
>
> In holdover mode, the tempco of the GPS receiver and the
> phase comparator have no effect. Maybe just the DAC tempco
> is all that's left?
>
> Does anyone know if 58503/Z3801-series has a temperature
> sensor?
>
> /tvb
>
>
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