I don't know that model - but with an HP tag it's likely to be one of
the 'good ones' .
In direct answer to your question, nothing will compare with Caesium -
although I don't think you really meant that :-) Cs is a standard in
its own right, not something you can lock. Unless you have a hydrogen
maser perhaps? (I suppose you could try using that to control the
Zeeman line magnetic field compensation - but you'd have to use a PLL
time constant of a few decades or centuries to do it properly!)
It is unlikely to be as good as a GPS disciplined Rb reference, but
even that would only be near-perfect if the time constant were made
long enough and it didn't use a frequency locked loop creating steps
to correct as certain well known GPSDO designs do.
For a look at the state of the art in amateur timekeeping, this site
takes some beating http://leapsecond.com/time-nuts.htm
Andy
On 3 December 2015 at 14:52, Warren Ziegler <[email protected]> wrote:
> Andy, Paul,
>
> How does the HP Z3816A rate for short term stability compared to
> caesium/rubidium based GPSDOs?
>
> Thanks
> Warren
>
>
>
> On Thu, Dec 3, 2015 at 9:39 AM, Paul Nicholson <[email protected]> wrote:
>>
>> Edgar wrote:
>>
>>> why is a GPSDO better than using just a Rubidium
>>> Oscillator for EbNaut?
>>
>> If you have a rubidium oscillator, then use it. But if
>> buying, then I'd suggest a GPSDO because they're often
>> cheaper, you don't have to worry about calibration, and
>> it also gives you a PPS for your soundcard and the UT for
>> your PC.
>>
>> VO1NA 2015-12-02/03 8K19A 1S 25C QRO
>>
>> start Eb/N0 BER rank
>>
>> 21:00 11.5 4.6% 0
>> 21:30 14.9 0.6% 0
>> 22:00 2.5 27.4% 0
>> 22:30 10.8 5.8% 0
>> 23:00 15.4 0.4% 0
>> 23:30 13.2 2.0% 0
>> 00:00 12.1 3.5% 0
>> 00:30 14.2 1.0% 0
>> 01:00 13.1 2.1% 0
>> 01:30 14.4 0.9% 0
>> 02:00 14.3 1.0% 0
>> 02:30 4.5 22.5% 0
>> 03:00 15.6 0.3% 0
>> 03:30 12.8 2.5% 0
>> 04:00 12.4 3.1% 0
>> 04:30 6.3 17.7% 0
>> 05:00 13.7 1.5% 0
>> 05:30 5.5 19.9% 0
>> 06:30 11.4 4.8% 0
>> 07:00 9.2 9.7% 0
>> 07:30 10.9 5.8% 0
>> 08:00 8.1 12.6% 0
>>
>> Only one missing, 06:00
>> --
>> Paul Nicholson
>> --
>>
>
>
>
> --
> 73 Warren K2ORS
> WD2XGJ
> WD2XSH/23
> WE2XEB/2
> WE2XGR/1
>
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