[time-nuts] HP10811 vs 00105 OCXO
timeok at timeok.it
timeok at timeok.it
Thu Aug 6 23:37:22 EDT 2015
here the ADEV of the two oscillator. I have added the Super performance of an HP105B (old oscillator) bought in an Ham fest.
On Fri 07/08/15 03:37 , Bob Camp <kb8tq at n1k.org> wrote:
> HP 10811’s vary over almost a 100:1 range in terms of ADEV performance
> at short tau. The standard model is un-sealed so it has some issues
> with humidity when it is in storage for a long time. In both the case of
> the 10811 and the 105, their stability will improve as they are
> on power. In the case of long term storage, they both may continue to
> improve for more than a month.
> All of this makes any sort of comparison between the two models a bit
> difficult. About all you can say is that on a given day, this example of
> was (or was not) more stable than that example of the other model.
> > On Aug 6, 2015, at 5:03 AM, timeok at timeok.it wrote:
> > Hi,
> > I have done some measurement comparing two HP OCXO, the HP10811 and the
> > These two oscillator are mounted in the HP5065A rubidium Standard, the
> 105 in the old models, the 10811 in newer, and for this purpose they are
> selected units.
> > I have two HP5065A use the different oscillators. For the stability test
> I have set the two 5065A in Open loop so the OCXO are free running .
> > I have done the measurements using as reference a third HP5065A in
> closed loop operation.
> > Here the files show the frequency and phase difference.
> > The 00105-6034 appear to be more stable as frequency than the 10811.
> > comments?
> > Luciano
> > www.timeok.it 
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