Re: [time-nuts] GPSDO and PPS measurement precision

[Attila Kinali]

On Fri, 3 Jun 2016 18:23:22 +0200
Lars Walenius  wrote:

> Using Tom van Baak´s GPSDO simulator is very informative as it can limit the 
> TIC resolution.

Oh.. right. I haven't thought about that... I need to see what I can
hack up using that.

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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Re: [time-nuts] GPSDO and PPS measurement precision

[Lars Walenius]

By the way: Have anyone compared the 30sec average from the Shera with a TI 
counter to see the real result?

Lars

Från: Lars Walenius<mailto:lars.walen...@hotmail.com>
Skickat: den 3 juni 2016 18:23
Till: Discussion of precise time and frequency 
measurement<mailto:time-nuts@febo.com>
Ämne: Re: [time-nuts] GPSDO and PPS measurement precision

Hej,

Using Tom van Baak´s GPSDO simulator is very informative as it can limit the 
TIC resolution.

Shera´s design is much more complicated than the 42ns resolution as it depends 
on the noise in the 24MHz oscillator. With an oscillator with enough noise 
during a 30 sec period it might be below 10ns eq. resolution all times? With a 
better oscillator it might have a ”hanging bridge” now and then.

Lars

Från: Attila Kinali<mailto:att...@kinali.ch>
Skickat: den 3 juni 2016 18:01
Till: Discussion of precise time and frequency 
measurement<mailto:time-nuts@febo.com>
Ämne: [time-nuts] GPSDO and PPS measurement precision

Moin,

With all the talk about GPSDOs going on in the last couple of months,
I started to wonder how much precision in the measurments is actually
needed. On one hand, we have the old GPSDO designs, like Shera's,
that offer a resolution in the 40ns range. On the other hand, we
have modern designs, that measure the PPS down to <100ps.

How much does the accuracy/stability improve using higher resolution?
Does anyone have data on that? If not, would someone be willing to
measure one of the better GPSDO's by artifically decreasing its
resolution in software and see what happends to the ADEV/MDEV/TDEV?

I am willing to give a hand with the data analysis, but I don't have
the equipment to do such a measurement.

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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Re: [time-nuts] GPSDO and PPS measurement precision

[Lars Walenius]

Hej,

Using Tom van Baak´s GPSDO simulator is very informative as it can limit the 
TIC resolution.

Shera´s design is much more complicated than the 42ns resolution as it depends 
on the noise in the 24MHz oscillator. With an oscillator with enough noise 
during a 30 sec period it might be below 10ns eq. resolution all times? With a 
better oscillator it might have a ”hanging bridge” now and then.

Lars

Från: Attila Kinali<mailto:att...@kinali.ch>
Skickat: den 3 juni 2016 18:01
Till: Discussion of precise time and frequency 
measurement<mailto:time-nuts@febo.com>
Ämne: [time-nuts] GPSDO and PPS measurement precision

Moin,

With all the talk about GPSDOs going on in the last couple of months,
I started to wonder how much precision in the measurments is actually
needed. On one hand, we have the old GPSDO designs, like Shera's,
that offer a resolution in the 40ns range. On the other hand, we
have modern designs, that measure the PPS down to <100ps.

How much does the accuracy/stability improve using higher resolution?
Does anyone have data on that? If not, would someone be willing to
measure one of the better GPSDO's by artifically decreasing its
resolution in software and see what happends to the ADEV/MDEV/TDEV?

I am willing to give a hand with the data analysis, but I don't have
the equipment to do such a measurement.

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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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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[time-nuts] GPSDO and PPS measurement precision

[Attila Kinali]

Moin,

With all the talk about GPSDOs going on in the last couple of months,
I started to wonder how much precision in the measurments is actually
needed. On one hand, we have the old GPSDO designs, like Shera's,
that offer a resolution in the 40ns range. On the other hand, we
have modern designs, that measure the PPS down to <100ps.

How much does the accuracy/stability improve using higher resolution?
Does anyone have data on that? If not, would someone be willing to
measure one of the better GPSDO's by artifically decreasing its
resolution in software and see what happends to the ADEV/MDEV/TDEV?

I am willing to give a hand with the data analysis, but I don't have
the equipment to do such a measurement.

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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