[time-nuts] 1pps PLL

[Jim Palfreyman]

For absolutely minimal expenditure might I suggest Murray Greenman's GPS disciplined clock:

http://www.qsl.net/zl1bpu/MICRO/GPSCLOCK/index.htm


I can highly recommend the project, which uses a microcontroller to PLL the VCXO to the 1PPS GPS. Heaps of fun and Murray has provided so much help. 

The most expensive parts are the GPS and the VCXO which you sound like you already have. It would cost you no more than US$30 tops. And that includes the US$10 Murray wants for the microcontroller code. And that includes support.

Murray built his original on project board, but I designed and made some double side printed circuit boards. If there was enough interest I'd be happy to get another batch made (minimum of three at a time) and make them available at cost+postage (around US$15 each from memory).

Regards,

Jim


On Tuesday, January 16, 2007 at 03:09:00 PM, Discussion of precise time and frequency measurement wrote:

> Hi nuts,
> 
> Since signing up to Time-nuts some time ago, there has been a lot of discussion
> relating to GPS disciplined frequency standards. Infact, the information
> is overwhelming but wonderful reading, but I must admit to some extent fragmented,
> but for a reason, mostly replies.
> 
> For the past 20 years I have played with TXCO's and more recently Rubidium
> frequency standards to provide my workshop and test gear with an accurate
> 10MHz clock with minimal phase noise and Freq drift.
> 
> In reading the many wonderful comments, suggestions and feedback and so on,
> I was wondering if I could ask you all for some advice on the best way to
> proceed with building a 1pps PLL so that I can lock my Rubidium FRS/LPRO/TXCO
> to my Oncore M12+ or VP that is just sitting there doing nothing at the moment.
> 
> I am keen to build something myself from scratch, however some of you may
> say the best way forward is to look at Brooks Shera's article and go the
> whole hog. I think Brooks GPS based frequency standard is fantastic and I
> am sure worth every Dollar well spent, however I am looking for something
> very simple to experiment with firstly, e.g. 4046 PLL, understand 1pps and
> then move up.
> 
> Don't all speak at once, no just kidding. I am looking forward to your replies.
> 
> Cheers
> 
> Gerald
> 
> 
>       
> 
> 
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