Dear Chris, Bert and all,
for the M12M, I have done exactly this..
http://gulp.physik.uzh.ch/de-saw.jpg
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.
Regards,
Achim
Chris
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
easy
I think you'd use the analog sawtooth voltage to slightly bias the
phase detector.
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