[time-nuts] DIY GPS-DO

[Magnus Danielson]

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<lists at rtty.us>  napisał(a):
>
>> Hi
>>
>> Which module do you have?
>>
>> Bob
>>
>>
>>
>> On Mar 10, 2012, at 8:07 AM, Filip Ozimek<me_super at o2.pl>  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.
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.