On 03/10/2012 02:38 PM, Filip Ozimek wrote:
It's an old novatel SUPERSTAR II.
It's not hard to hook up a more stable 10 MHz oscillator to the Novatel
Superstar II. There is PCB foot-print for it and you need to move a
component (don't recall if it is a resistor or cap) to enable it.
Get the message ID #21 and use the clock bias and clock drift measures
to steer the oscillator. It should be trivial to setup a FLL/PLL PI loop
and steer a DAC.
http://webone.novatel.ca/assets/Documents/Manuals/om-20000086.pdf
The PPS may still need some processing.
I've intended to do this for ages, but never got off the ground.
Cheers,
Magnus
Filip.
Dnia 10 marca 2012 14:14 Bob Camp<[email protected]> napisał(a):
Hi
Which module do you have?
Bob
On Mar 10, 2012, at 8:07 AM, Filip Ozimek<[email protected]> wrote:
Hello,
could you recommend me a good project of GPS-DO? I've got a GPS module with
1PPS output and a 20 MHz VCXO.
As I understand to do a phaselock to 1 PPS signal one must build some kind of
digital PLL. But I'm not sure
how to calculate a correction signal to the VCXO and how to test such a
disciplined oscillator.
Filip.
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