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| author | Josh Blum <josh@joshknows.com> | 2010-11-23 18:32:47 -0800 |
|---|---|---|
| committer | Josh Blum <josh@joshknows.com> | 2010-11-23 18:32:47 -0800 |
| commit | adee39f089420ce4cbf3d2da156b4b82c4240313 (patch) | |
| tree | 8dc5c8bc302ac88c3ac9e612af84bd64727abc1d /host/docs/usrp1.rst | |
| parent | 905f42618d42343e7aae57129b37726011e8befd (diff) | |
| parent | b8b4d9406c9785546c575addff2a5ba518ecd790 (diff) | |
| download | uhd-adee39f089420ce4cbf3d2da156b4b82c4240313.tar.gz uhd-adee39f089420ce4cbf3d2da156b4b82c4240313.tar.bz2 uhd-adee39f089420ce4cbf3d2da156b4b82c4240313.zip | |
Merge branch 'refclock_docs'
Diffstat (limited to 'host/docs/usrp1.rst')
| -rw-r--r-- | host/docs/usrp1.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/host/docs/usrp1.rst b/host/docs/usrp1.rst index be684e20e..9038616a8 100644 --- a/host/docs/usrp1.rst +++ b/host/docs/usrp1.rst @@ -89,3 +89,25 @@ Windows - install driver On Windows, a driver must be installed the first time the USRP1 is attached to the host computer. A download link for this driver can be found on the UHD wiki page. Download and unpack the driver, and direct the Windows driver install wizard to the .inf file. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Hardware setup notes +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +------------------------------------------------------------------------ +External Clock Modification +------------------------------------------------------------------------ +The USRP can be modified to accept an external clock reference instead of the 64MHz onboard reference. + * Solder SMA (LTI-SASF54GT) connector to J2001 + * Move 0 ohm 0603 resistor R2029 to R2930 + * Move 0.01uF 0603 capacitor C929 to C926 + * Remove 0.01uF 0603 capacitor C924 + +The new external clock needs to be a square wave between +7dBm and +15dBm + +To configure UHD for the new reference clock, modify host/lib/usrp/usrp1/clock_ctrl.cpp: + +:: + + static const double master_clock_rate = <YOUR_NEW_REFERENCE_FREQUENCY>; + |