Calibration and precision frequency comparison is a lot like
parenting; It's an ongoing process that never ends.
Burt, K6OQK
From: "Bob Camp" <[email protected]>
Subject: Re: [time-nuts] Frequency comparison
Hi
The rubidium *should* be good at the 1x10^-11 level. The GPSDO can be better
than that. The issue is that neither one is very good in the short term.
Measurement periods of hours are not unusual to get things right. If GPS
with your antenna location is good at the 10 ns level, that's 1x10^-8 per
second. 10,000 seconds will get you to 1x10^-12. That's good enough to
calibrate the rubidium. The calibration standard should always be much
better than the thing you are calibrating.
No matter what you do, it's a "watching grass grow" sort of thing. Some sort
of automation is a good idea.
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
K6OQK
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
