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

Bob kb8tq kb8tq at n1k.org
Fri Jun 8 11:17:55 EDT 2018


Hi

With ADEV, you really need something closer to 100X your tau to get accurate data. The utter impossibility of doing this 
for long Tau is what has driven the development of other evaluation methods. 

Bob

> On Jun 8, 2018, at 10:36 AM, timeok at timeok.it wrote:
> 
> 
>   Hi Adrian,
>   as you know, to get real data up to 100K sec range, you should acquire at least 500K 1M sec.
>   I say this from my personal experience. Soon I will have my 30 days run for both the A and B version of the HP5065.
>   Very interesting the response of the GPSDO in the range 1 to 100 sec that I had never had the chance to see for lack of an instrument as your A7.
>   ciao,
>   Luciano
> 
> 
>   Da "time-nuts" time-nuts-bounces at febo.com
>   A time-nuts at febo.com
>   Cc
>   Data Fri, 8 Jun 2018 15:46:50 +0200
>   Oggetto Re: [time-nuts] Raw phase data of super-5065
>   This is a 6 days run of a modified 5065'B' against GPS.
> 
>   Adrian
> 
>   Am 08.06.2018 um 14:05 schrieb timeok at timeok.it:
>> 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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