[time-nuts] HP10811 vs 00105 OCXO
Mark Spencer
mark at alignedsolutions.com
Fri Aug 7 14:45:33 EDT 2015
Hi Luciano. That is interesting. Thanks for sharing this.
I also have an HP105B with the old style oscillator. (An auction site purchase from years ago.) Yours seems at bit better than the one I have at tau's of approx 100 seconds or so. I'm curious if you have any data for longer tau's ?
All the best Mark Spencer
> On Aug 6, 2015, at 8:37 PM, timeok at timeok.it wrote:
>
>
> here the ADEV of the two oscillator. I have added the Super performance of an HP105B (old oscillator) bought in an Ham fest.
>
> Luciano
>
>
>
>> On Fri 07/08/15 03:37 , Bob Camp <kb8tq at n1k.org> wrote:
>>
>> Hi
>>
>> 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
>> one
>> was (or was not) more stable than that example of the other model.
>>
>> Bob
>>
>>> 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
>> 105.
>>>
>>> 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 [1]
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