diff options
Diffstat (limited to 'host/docs/usrp_x3x0.dox')
| -rw-r--r-- | host/docs/usrp_x3x0.dox | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/host/docs/usrp_x3x0.dox b/host/docs/usrp_x3x0.dox index d76d5eaa0..84ef7bd99 100644 --- a/host/docs/usrp_x3x0.dox +++ b/host/docs/usrp_x3x0.dox @@ -616,10 +616,17 @@ Afterward, power-cycle your X-Series device for the changes to take effect. \subsection x3x0_hw_x3x0_hw_ref10M Ref Clock - 10 MHz Using an external 10 MHz reference clock, a square wave will offer the best phase -noise performance, but a sinusoid is acceptable. The power level of the reference clock cannot exceed +15 dBm. +noise performance, but a sinusoid is acceptable. +The power level of the reference clock must exceed +15 dBm. + +To use the external reference in your UHD session, make sure to either call +uhd::usrp::multi_usrp::set_clock_source() or specify `clock_source=external` in +your device args. \subsection x3x0_hw_pps PPS - Pulse Per Second -Using a PPS signal for timestamp synchronization requires a square wave signal with the following a 5Vpp amplitude. + +Using a PPS signal for timestamp synchronization requires a square wave signal +with a 5Vpp amplitude. To test the PPS input, you can use the following tool from the UHD examples: @@ -628,6 +635,10 @@ To test the PPS input, you can use the following tool from the UHD examples: cd <install-path>/lib/uhd/examples ./test_pps_input --args=\<args\> +To use the external time source in your UHD session, make sure to either call +uhd::usrp::multi_usrp::set_time_source() or specify `time_source=external` in +your device args. + \subsection x3x0_hw_gpsdo Internal GPSDO Please see \ref page_gpsdo_x3x0 for information on configuring and using the internal GPSDO. |