[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] grGPS Preliminary Schematic
From: |
Daniel O'Connor |
Subject: |
Re: [Discuss-gnuradio] grGPS Preliminary Schematic |
Date: |
Thu, 6 Apr 2006 14:10:53 +0930 |
User-agent: |
KMail/1.9.1 |
On Thursday 06 April 2006 13:14, Martin Dvh wrote:
> 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)
Farnell sell 32.768 MHz crystals (They're not what you'd call cheap though -
AU$17). Hmm they have 16.384 MHz ones for $12.81. Still not cheap..
Also, I think getting 32.768 MHz from 4Mhz with a PLL would be pretty
difficult (if not impossible)
--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
pgpfpEAxo9Ibz.pgp
Description: PGP signature
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, (continued)
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Lee Patton, 2006/04/05
- [Discuss-gnuradio] gr-audio-oss segfaults, Berndt Josef Wulf, 2006/04/06
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Eric Blossom, 2006/04/06
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Eric Blossom, 2006/04/06
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Berndt Josef Wulf, 2006/04/06
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Eric Blossom, 2006/04/06
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Berndt Josef Wulf, 2006/04/07
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Eric Blossom, 2006/04/09
- Re: [Discuss-gnuradio] gr-audio-oss segfaults, Berndt Josef Wulf, 2006/04/10
Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Martin Dvh, 2006/04/05
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic,
Daniel O'Connor <=
Re: [Discuss-gnuradio] grGPS Preliminary Schematic, David Bengtson, 2006/04/06
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Clark Pope, 2006/04/06
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, David Bengtson, 2006/04/06
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Matt Ettus, 2006/04/06
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, David Bengtson, 2006/04/06
- Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Marcus Leech, 2006/04/06
Re: [Discuss-gnuradio] grGPS Preliminary Schematic, Robert W McGwier, 2006/04/06