[time-nuts] Thunderbolt? (re simple gpsdo.)

Azelio Boriani azelio.boriani at screen.it
Sat Dec 31 09:03:24 UTC 2011


PI controllers can be implemented      analog only. For the PPS they need
large capacitors that are the equivalent of averaging (sum and accumulate)
in a software implemented controller.

On Sat, Dec 31, 2011 at 7:54 AM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> On Fri, Dec 30, 2011 at 11:46 AM, Stanley <timenuts at n4iqt.com> wrote:
> >
> >
> >>
> >>> "What is the simplest design for a GPSDO that uses only the PPS signal
> >>> from
> >>> a modern GPS?"
> >>
> >>
> >> Some sort of oscillator with a voltage control.
> >> CPU with a timer/counter that can capture the PPS.
> >> DAC.
> >> Software.
> >>
> >
> > How about MSC1200 : http://www.ti.com/lit/ds/symlink/msc1200y3.pdf
>
> I don't count anything with a computer and software inside as
> "simple".   My definition of a simple device is a capacitor or a
> transistor or I guess a single flip-flop or op-amp.   A simple
> controller would some how use about two dozen or less of these kinds
> of components.
>
> Home heating thermostats can be simple of complex.  Some use LCD
> displays and a computer.  Other have a simple bimetallic spring
> inside.
>
> If this CAN'T be done.  And if a computer is really required.  I'm
> going to go all out and use a "real" computer.  Something that can run
> an operating system and talk on the network.  Here is an example of
> what I mean
>
> http://www.embeddedarm.com/products/board-detail.php?tab=options&product=TS-7550#
>
> No one really wants a device that connects to a computer over a serial
> port.  That was 20 years ago.   The above board can host a web site
> and log data to a USB thumb drive and burns less then 2W of power
>
> But for now I'm looking for a controller that is much more like the
> bimetallic spring thermostat.
>
> Chris Albertson
> Redondo Beach, California
>
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