On 2021-10-15 3:02 p.m., Achilleas Anastasopoulos wrote:
Hi Marcus and all,
The X310 has three leds in the front panel (among others):
REF, PPS, GPS
When I turn on the USRP none of them is lit.
When I execute "uhd_usrp_probe" from the terminal the the REF lights
up and the PPS starts blinking.
What is the meaning of this? (I am not connected to any REF source ...)
thanks
Achilleas
UHD_USRP_PROBE will set the system clock to the GPS if there's one
installed.
Regardless, there's always a system REF clock and internal PPS. The REF
LED is simply indicating
that the internal reference PLL is locked--whether its getting that
from external, the internal GPS, or just from
the on-board TCXO oscillator.
The GPS LED illuminates when the internal GPS module indicates that it
has achieved lock.
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