Re: [Discuss-gnuradio] grGPS Preliminary Schematic

[Martin Dvh]

David Bengtson wrote:
> After far to long, I've updated the information on the Gnu Radio GPS
> board. I've finished a preliminary schematic, and I'd appreciate any
> comments that anyone might have.
Why don't you use the usrp to generate your 16.384 or 32.768 MHz refclock.
Most daugterboards (except the tvrx) use this feature (They all use a 4Mhz 
refclock on io pin 0.
The only difference with your design is that you need another frequency.
The cyclone fpga in the usrp has internal PLLs which can generate all kinds of 
frequencies.
(They are not used at the moment)

This way you would have a phase coherent system.
Which is very nice if you start to play with multiple gps daughterboards.

You could then even play with modifying the refclock frequency to receive other 
frequencies.
(like the russian or the european GPS-like systems, which are on frequencies 
near the GPS frequency)

Greetings,
Martin

> 
> Page:
> http://www.keystoneradio.com/grGPS.html
> 
> Schematic
> 
> http://www.keystoneradio.com/pdfs/Schematic_1.pdf
> 
> Thanks
> 
> 
> Dave
> 
> 
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