[time-nuts] Rubidium Performance

[John Miles]

(Sorry for the dupe, not sure how that happened...)

-- john

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of John Miles
> Sent: Sunday, February 05, 2012 1:46 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Rubidium Performance
> 
> > John
> > Thank you for your effort. It would be nice if you could confirm the 4
to
> 5
> >  Hz dither that seems to be the loop time constant and long term aging
> that
> > will  influence the GPS/Rb control loop time constant setting. I did see
1
> > E-12 per  month which may be unique to that unit.
> > Bert Kehren
> 
> There's a lot of impulse-like structure in the 10 MHz signal from the
units
> I have, certainly.   You can see the spikes here that are associated with
> the spurs at multiples of 1 Hz in the earlier PN plot, as well as some
even
> stronger pulses that show up about every 28 seconds.  They might
> correspond
> to the grand repetition rate of the DDS.
> 
> I don't see anything specific around 4-5 Hz except for the 1 Hz harmonics.
> 
> -- john