[time-nuts] DIY GPS-DO

Azelio Boriani azelio.boriani at screen.it
Sat Mar 10 14:05:47 UTC 2012


Sure it is message ID #21 to be looked for?

On Sat, Mar 10, 2012 at 2:54 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> 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.
>>>>
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>
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