[time-nuts] FE-5680A Mechanical Question

Bob Camp lists at rtty.us
Fri Jan 13 12:29:28 EST 2012


Common wisdom is that Rb's come back up pretty close to where they shut
down. Weather it takes 10 minutes or two hours to get close on the specific
Rb you have is indeed an open question.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bob Smither
Sent: Thursday, January 12, 2012 9:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question

J. L. Trantham wrote:
> Bob,
> You (and others) make a good point.  The stability of a good Rb may be
> that, in a portable operation, if you are going to be there for less than
> weeks, why bother with the GPSDRbO option.  Turn it on, adjust it to your
> GPSDO at home, turn it off, take it to the site, turn it on, use it, turn
> off, bring it back home, turn it on and compare it to your GPSDO.

This might work if all you are concerned with is the 10MHz.  If the 1PPS
the Rb is to be used, it will come up at some random phase after the unit is
powered off and back on.

I have not done the power off - restart test to see how close the 10MHz
recovers.  Not sure I have anything that could measure it.  Maybe it is time
order a 2nd Rb :-).

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