[time-nuts] Expected 10 MHz offset from a GPSDO?

Bob kb8tq kb8tq at n1k.org
Fri Aug 19 20:03:59 EDT 2016


Ok let's toss some numbers into the mix.

The counter time base one day after calibration is in the 0.5 to 1.5 ppb range.

The LPRO ten years after it left the factory is in the 0.5 to 1.5 ppb range.

The GPSDO when running properly should be in the 0.005 to 0.02 ppb range at one second.

One ppb at 10 MHz is 0.01 Hz. It also is a the resolution limit on a 5335 at 1 second.


> On Aug 19, 2016, at 5:29 PM, Mark Sims <holrum at hotmail.com> wrote:
> Try driving your counter frequency reference input with the LPRO or comparing the LPRO with the GPSDO.  The LPRO is (most likely) much more accurate the counters' internal timebase.
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