Betreff: Re: [time-nuts] GPS orthodontics: sawteeth & hanging
> bridges-theeffect of time averaging
>
>
> Knew there was something I liked about Ulrich!
> Laphroaig! I have a 30 and 40 in my collection... waiting for
> an excuse to open my 40.
>
>
>
>
>
>
> Brooke
>
> I'm not convinced that one can actually directly derive the GPS timing
> receiver stability from measurements taken within a feedback loop where
> the OCXO is locked to the GPS timing receiver output. Surely one has to
Yes, I'm nervous about this approach too.
> correct for the loop
Knew there was something I liked about Ulrich!
Laphroaig! I have a 30 and 40 in my collection... waiting for an excuse to open
my 40.
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age -
>From: "Brooke Clarke" <[EMAIL PROTECTED]>
>To: "Discussion of precise time and frequency measurement"
>
>Sent: Friday, December 22, 2006 14:27
>Subject: Re: [time-nuts] GPS orthodontics: sawteeth & hanging bridges-
>theeffect of time averaging
s, including 1e6.
>
> Have Fun,
>
> Brooke Clarke
>
- Original Message -
From: "Brooke Clarke" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, December 22, 2006 14:27
Subject: Re: [time-nuts] GPS orthodonti
gt;>>
>>>> Nevertheless, pardon to contradict you: One simply has NO choice to
>>>> average this long or to average that long. You have to set the
>>>> regulation loop time constant up to exactly where the OCXO's
>>>> tau-sigma-diagram meets the
nstant different from that is a faulty design and nothing else. The
>>>regulation loop dynamics may be improved a bit by pre-averaging the
>>>phase data before they are fed into the loop but not by computing the
>>>arithmetic mean over a time but by a gliding exponential
>> phase data before they are fed into the loop but not by computing the
>> arithmetic mean over a time but by a gliding exponential average as is
>> explained in detail in the PRS-10's handbook. Due to stability reasons
>> even this time constant of this pre-filter
,DF6JB
>
>
>
>
>>-----Ursprüngliche Nachricht-
>>Von: [EMAIL PROTECTED]
>>[mailto:[EMAIL PROTECTED] Im Auftrag von Brooks Shera
>>Gesendet: Donnerstag, 21. Dezember 2006 18:50
>>An: Discussion of precise time and frequency measurement
>>Betreff: [time-
e and frequency measurement
> Betreff: Re: [time-nuts] GPS orthodontics: sawteeth & hanging
> bridges-theeffect of time averaging
>
>
> > Have a look to
> http://www.ulrich-> bangert.de/html/photo_gallery_44.html
>
>
> Ulrich,
>
> Thanks a
> nice
> Have a look to
> http://www.ulrich-bangert.de/html/photo_gallery_44.html
Ulrich,
Thanks a nice one. What 1PPS reference did you use
when that M12 data was collected?
/tvb
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t; Von: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Im Auftrag von Brooks Shera
> Gesendet: Donnerstag, 21. Dezember 2006 18:50
> An: Discussion of precise time and frequency measurement
> Betreff: [time-nuts] GPS orthodontics: sawteeth & hanging
> bridges - theeffect of time ave
In message <[EMAIL PROTECTED]>, "Tom Van Baak" writes:
>1 second raw samples: 10.40 ns
>then removing small linear frequency offset,
>1 second samples: 9.36 ns
>30 second averages: 9.62 ns
>300 second averages: 10.0 ns
>
>Did I do something wrong? PHK, what do you think
>about this?
Given what w
> To explore this I used TAC32 to record the 1 pps sawtooth
> correction message from a Motorola M12+ receiver for
> about 1 hour, during which time many bridges occurred (1).
> Excel's statistical toolbox was then used to examine
> the data.
Brooks,
That's really nice work.
Are you sure, though
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