My Rubidium reference vs my GPSDO.
I probably need to find a cesium reference to know who's right and who's not.
That would be fun, go for it!
I'm looking forward to your teardown of that gem then.
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?
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..)
When you ran down this timenuttin' rabbit hole a cesium standard might easier find the way to you because of Karma.