On 04/06/2018 08:29 AM, ALEJANDRO BLANCO PIZARRO wrote:
Hi all, Marcus,
Thanks for the answer, it was really useful. Now, I am trying to
generate the 10Mhz signal using a vector signal generator, but the
signal is nor really pure because the signal generator bandwidth is
only 60MHz. Also, the Vpp of the signal is 1.4 V, is it correct?
If someone can see the signal (in attached) and tell me if I can use
it as an external clock, it will be really helpful.
Best regards,
Alejandro
What is the stability of your vector signal generator? I suspect that
it's much worse than the on-board clocks.
You'd do better to use an external GPSDO to feed to your two X310.
2018-04-05 16:34 GMT+02:00 Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>>:
On 04/05/2018 06:20 AM, ALEJANDRO BLANCO PIZARRO via USRP-users wrote:
Dear community,
I would like to add an external clock to two USRP in order to
have the same clock discarding possible synchronization
issues. The desirable frequency of the clock would be 184 MHz
(compatible with LTE).
And I was wondering about what will be the possible solutions:
--> It is possible to use a sine signal with a desirable
frequency as an external clock? In this case what will the
amplitude of the signal be? Unfortunately, I do not have a PWM
generator in order to use it as a clock.
--> It is possible to use another USRP as an external clock
using a transmit basic daughterboard ?
Thanks you so much in advance.
Best regards,
Alejandro
X310 supports an external clock already, via the 10MHz front-panel
input. The master clock (which can be 184.32Mhz, to support LTE)
is then derived
from that. Just feed a 10Mhz clock to all your X310s.
See:
https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices
<https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices>
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