[time-nuts] Odetics 365

[Azelio Boriani]

You are measuring your counter stability, not the GPSDO stability. A locked
GPSDO is way better than any free running counter if driven by its internal
timebase oscillator.

On Thu, Oct 18, 2012 at 8:39 AM, Rob S. <roberts at dcsi.net.au> wrote:

> Hello Group,  first time post
>
> I have just got my Odetics 365 working again after it being packed away for
> a few years. I have it connected to a HP 5386A frequency counter and am
> monitoring the 10 MHz output ( down to 0.01 Hz res ).
>
> I am noticing the frequency is drifting about 1.5 to 2 Hz over the day and
> settling low for a few hours ( aprox midday ) and then settling high about
> 12 hours later. The 365 is showing TFOM4 and Time locked, has a GDOP of
> 3.68
> and displays a frequency error of +2.98E-013  and a Std error of Est of
> 4.80E-008. The averaging is turned off and it "see's" 3 to 5 satellites
> continuously.  My question is would this be normal behavior ( + or - 2 Hz )
> for this type of equipment or is it looking like I have something that is
> drifting a bit ? Also would switching the averaging on help ?
>
> Any thoughts would be appreciated Group,
>
> Thanks and Cheers,
>
> Rob.
>
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