On 04/10/2018 06:49 AM, ALEJANDRO BLANCO PIZARRO wrote:
Hi all, Marcus,
I continue trying to generate the square signal as a clock but now by
means of a FPGA.
The square signal, that I generated, has *a period of 100 ns and a Vpp
of 0.65 V (in attached). *These values are correct in order to feed a
USRP?
Thanks in advance. Best regards,
Alejandro
That signal looks good to me.
2018-04-06 16:28 GMT+02:00 Marcus D. Leech <mle...@ripnet.com
<mailto:mle...@ripnet.com>>:
On 04/06/2018 10:16 AM, ALEJANDRO BLANCO PIZARRO wrote:
Hi Marcus,
Thanks a lot! What GPSDO do you recommend? We need to buy one.
Best regards,
Alejandro
Most Ettus customers with more than a single USRP tend to use the
Octoclock-G:
https://www.ettus.com/product/details/OctoClock-G
<https://www.ettus.com/product/details/OctoClock-G>
2018-04-06 16:00 GMT+02:00 Marcus D. Leech <mle...@ripnet.com
<mailto:mle...@ripnet.com>>:
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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