[time-nuts] Best counter setting for ADEV?

Bob Camp lists at rtty.us
Wed Oct 3 12:47:07 EDT 2012


Hi

NTP server? Time tagging remotely collected data? Large area industrial
automation?

Generally as you relax the timing requirement, the number of applications
goes up quite a bit. If all you need is a few hundred ns (but under a few
microseconds), a bare timing receiver is a fine thing. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of shalimr9 at gmail.com
Sent: Wednesday, October 03, 2012 8:46 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best counter setting for ADEV?

Of course, that only works when you actually need a GPSDO, but what is the
point of a GPS timing receiver if not to discipline a high quality
oscillator?

Didier KO4BB

Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: Jim Lux <jimlux at earthlink.net>
To: time-nuts at febo.com
Sent: Tue, 02 Oct 2012 9:34 PM
Subject: Re: [time-nuts] Best counter setting for ADEV?

On 10/2/12 7:00 PM, shalimr9 at gmail.com wrote:
> The Thunderbolt is a special case that does not provide sawtooth
correction because it does not need it.
>
> It uses the OCXO as the clock for the processor while disciplining it to
GPS so there is no nominal timing error between where the 1PPS is versus
where it should be.
>
> The processor is able to bring the PPS edge exactly where it wants it,
instead of the typical 25 to 40 ns granularity of most other GPS receivers
that operate on a separate clock.
>
> Pretty simple and elegant solution.
>


But it does depend on having a good oscillator that can be shoved 
around.  That costs money and power.


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