[time-nuts] GPSDO testing

[Rob Leahy]

G'Day All,

Thanks for adding to me to this group.

I had an application at my workplace where we sent out GPS simulator out for
calibration, and it was found its OCXO was drifting and unstable.

We had no equipment at work, with the required resolution and accuracy to
measure this drift, so to add to my personal test gear I purchased a Chinese
GPSDO which was built around a Trimble unit, A gentric Chinese GPSDO and a
symmetricom GPSDO pcb. Below are links to some of the time toys I have
purchased, in addition to an Agilent 53132A  counter.

 

I have had the Trimble acting as a timebase for the 53132A and am measuring
the symmetricom pcb. This board has a new OCXO from digikey fitted - Connor
Winfield / OH200-71005SV-010.0M

 

I am chasing 0.001hz accuracy - short and long term, is this an achievable
goal with what I have?

 

Here is the lastest results over 48 hours after have the GPSDO's operating
for over a week.

 


Average MHz

9.999999999990


Standard deviaion

1.42841E-09


Max

10.000000006275


Min

9.999999992006


 

Opinions would be appreciated!

 

Cheers

 

Rob

 

 

https://www.ebay.com.au/itm/264742751023?ssPageName=STRK%3AMEBIDX%3AIT&_trks
id=p2060353.m2749.l2649

 

https://www.aliexpress.com/item/1005001868503492.html?spm=a2g0s.9042311.0.0.
24914c4dOxEx60

 

https://www.aliexpress.com/item/4000169088065.html?spm=a2g0s.9042311.0.0.249
14c4dOxEx60

 

https://www.aliexpress.com/item/4000920979852.html?spm=a2g0s.9042311.0.0.249
14c4dOxEx60

 

https://www.aliexpress.com/item/4000925507493.html?spm=a2g0s.9042311.0.0.249
14c4dOxEx60