My Rubidium reference vs my GPSDO.
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=979920;image)
I probably need to find a cesium reference to know who's right and who's not.
That would be fun, go for it!
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
I'm looking forward to your teardown of that gem then.
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
But what about something easier to accomplish first?
Looking at that BG7TBL FA-2 counter I see lots of resolution when taking samples with a gate time of 10s.
Seems to be very much maths involved, so what's the precision of that unit?
Perhaps you should first check with a decent counter with high resolution
and high precision, for example some nice gear from HP/Agilent/Keysight (53132A, 5370A or newer ones), Fluke/Pendulum (PM91,CNT-91), Stanford Research (SR 620).
I surely missed some. Any further suggestions?
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
Secondly, can you improve your GPS antenna setup?
With a good view of the sky and a good antenna you could explore how different GPSDOs compare (even better with step one accomplished -better counter..)
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)
When you ran down this timenuttin' rabbit hole a cesium standard might easier find the way to you because of Karma.
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)