[time-nuts] 1 pps correction
avollhar at physik.uzh.ch
Tue Apr 10 09:06:58 EDT 2012
Dear Chris, Bert and all,
for the M12M, I have done exactly this..
It plugs in between the M12M and the carrier board and compensates the
sawtooth based on the @@Hn information via a delay line. Yes, the uC is
rather large, but used because available :)
If anybody is seriously interested, I am happy to hand over layout and
source code. Please contact directly.
> do you or any one else have a micro controller and code for such an 8 pin
> solution? The rest I would know how to do.
> Bert Kehren
> In a message dated 4/7/2012 12:12:40 P.M. Eastern Daylight Time,
> albertson.chris at gmail.com writes:
> The simplest way to do this is to use a "standard" GPS and let if
> drive a GPSDO. Yes you can try and build a copy of a T-bolt but how
> many engineering ours do you think Trimble spent on that? Well over a
> man year I'd say and few people have the range of skills needed to do
> it all themselves.
> If you want to use the sawtooth data in the GPSDO then you'd need a
> one of those very small 8-pin micro controllers. It could "tap" the
> serial line and listen for the sawtooth correction and then output a
> voltage on an analog pin. The sawtooth correction does not change
> very fast so the bandwidth is low enough for something like an AVR or
> PIC. This uP would have only one function so the software would be
> I think you'd use the analog sawtooth voltage to slightly bias the
> phase detector.
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