[time-nuts] A question from a newbie

Peter Vince petervince1952 at gmail.com
Fri Nov 2 17:27:45 EDT 2018


Hi Tom,

    Like Daniel, I would also love to see your QBASIC programs please.

    Thank you,

          Peter


On Fri, 2 Nov 2018 at 19:14, Daniel H. Pressler <dpressler at dandydan.net>
wrote:

> Tom,
>
>    Thanks so much.  I downloaded both the suggest software packages and
> they
> look excellent.  It appears to me that my Arduino with phase comparator
> should be a data collection only environment since these programs seem to
> have all the whistles and bells I'm looking for.  I would appreciate
> anything you might have in QBASIC as well.  That will save me from the
> challenge of refreshing my C code skills.
>
>    Again, thanks so much.  This was exactly what I was looking for.
>
> Respectfully,
>
>
> Daniel H. Pressler, KF2HP
>
>
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of Tom
> Van Baak
> Sent: Thursday, November 1, 2018 9:54 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] A question from a newbie
>
> Daniel,
>
> There's simple C code at http://leapsecond.com/tools/adev_lib.c that does
> ADEV / MDEV / TDEV / HDEV.
> A sample ADEV program using that code is:
> http://leapsecond.com/tools/adev1.htm
>
> There are Python versions on the web if you're into Python and its
> ecosystem.
> If you want a QBASIC version let me know.
>
> The only thing you need to watch out for is that there are two forms of the
> ADEV formula. The "x" version takes phase difference as input. The "y"
> version takes fractional frequency difference as input. You can convert one
> to the other with differentiation or integration.
>
> Since your old GPIB and basic days there are some very nice tools that take
> all the pain out of ADEV now.
> One is Stable32, highly recommended. [1]
> The other is TimeLab, also highly recommended, especially if this is your
> first time doing clock statistics interactively. [2]
> Both have extremely well-written and informative documentation, worth
> reading even if you don't use the programs.
>
> /tvb
>
> [1] http://www.stable32.com/
> [2] http://www.ke5fx.com/timelab/readme.htm
>
>
> ----- Original Message -----
> From: "Daniel H. Pressler" <dpressler at dandydan.net>
> To: <time-nuts at lists.febo.com>
> Sent: Thursday, November 01, 2018 3:05 PM
> Subject: [time-nuts] A question from a newbie
>
>
> >I was directed to this group when I asked this question of another group.
> > However, after reading some of the emails I am a real novice when it
> comes
> > to this stuff.  I worked with cesium and rubidium oscillators as Primary
> > Reference clocks in the telecommunication industry.  When I was there I
> > wrote a basic program to retrieve phase offset between two signals over
> GPIB
> > from a counter.  The program then calculated frequency accuracy and did
> some
> > Allan Variance calculations.  I am trying to replicate that with an
> Arduino
> > and a simple phase comparator.  I have forgotten the math and I am not
> smart
> > enough to glean it out of the data presented on the internet.  Can
> someone
> > point me to some example programs that will allow me to measure phase
> offset
> > over time and calculate frequency accuracy and do some basic Allan
> Variance
> > calculation.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Daniel H. Pressler, KF2HP
> >
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