[time-nuts] Raw phase data of super-5065

Bob kb8tq kb8tq at n1k.org
Fri Jun 8 09:02:34 EDT 2018


Hi

Ok, so this question should not come as a great surprise: Does one of the 5065’s have about 3X the temperature 
sensitivity of the other? ( or pressure or humidity ). 

Bob



> On Jun 8, 2018, at 8:05 AM, timeok at timeok.it wrote:
> 
> 
>   Here a ten days simultaneously run of the A and B version compared with my HP Z3816A GPSDO.
>   Luciano
> 
> 
>   Da "time-nuts" time-nuts-bounces at febo.com
>   A kb8tq at n1k.org
>   Cc "time-nuts" time-nuts at febo.com
>   Data Wed, 6 Jun 2018 08:18:27 +0200
>   Oggetto Re: [time-nuts] Raw phase data of super-5065
> 
>   Hi,
> 
>   certainly the environmental effects are significant and it is precisely for this reason that
>   acquisitions have been made simultaneously on two 5065, one modified and the other not.
>   To verify the results the same measures were taken with another pair of 5065, one modified and the other not.
>   This second test was carried out at another site 300Km from the first one.
>   Both tests showed a better and more consistent medium/long term ADEV than the unmodified HP5065A.
>   I want to clarify that these measures have the objective of verifying the medium / long term stability and not the short term stability of the Super version I agree it is improved..
>   Luciano
> 
> 
>   Da "Bob kb8tq" kb8tq at n1k.org
>   A "Luciano Paramithiotti" timeok at timeok.it,"Discussion of precise time and frequency measurement" time-nuts at febo.com
>   Cc
>   Data Tue, 5 Jun 2018 10:05:34 -0400
>   Oggetto Re: [time-nuts] Raw phase data of super-5065
>   Hi
> 
>   It is pretty well known that without “help” ( beyond the filter stuff on the super) the 5065 has fairly poor temperature
>   stability and somewhat variable response to pressure and humidity. Taking two samples right off the production line
>   likely would have given you different long term data as a result.
> 
>   If you are going to the trouble of watching these devices for a long time, monitor temperature, pressure and humidity.
>   I suspect you will find correlations ….
> 
>   Bob
> 
>> On Jun 5, 2018, at 5:44 AM, timeok at timeok.it wrote:
>> 
>> 
>> Hi Attila,
>> I am doing the long therm stability test on a couple of HP5065, one original A type, the second B or "super" compared with my best long therm stability, a GPSDO HPz3816A.
>> This test will be 30 days long. It is a second test, with a second couple of HP5065A/B, to verify the long therm stability of both the version.
>> 
>> Up to now the data available for version B or "super" only concerned the improvement of phase noise.
>> 
>> From the first results it seems that the HP5065A is more stable within 30days than the modified version with the filter.
>> It must be considered that the short-term stability of 5065 is better than the GPSDO / TICC up to 10-80k sec then, in this test configuration the valid data will be beyond these values.
>> The results will be ready within 28 days and I will be happy to share them in order to have everyone's opinion.
>> Regards,
>> Luciano
>> 
>> 
>> Da "time-nuts" time-nuts-bounces at febo.com
>> A "Discussion of precise time and frequency measurement" time-nuts at febo.com
>> Cc
>> Data Mon, 4 Jun 2018 10:11:50 +0200
>> Oggetto [time-nuts] Raw phase data of super-5065
>> Hoi zäme!
>> 
>> Would one (preferably multiple) of the owners of a super-5065 be so kind
>> and share the raw phase data of an super-5065 against a stable reference
>> with me? The longer the data trace, the better.
>> 
>> Thanks in advance!
>> 
>> Attila Kinali
>> 
>> --
>> It is upon moral qualities that a society is ultimately founded. All
>> the prosperity and technological sophistication in the world is of no
>> use without that foundation.
>> -- Miss Matheson, The Diamond Age, Neil Stephenson
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