Hi all, Marcus,
Finally, I've fed one USRP with the clock that I generated. But I would
like to check if it is working properly, besides, I explicitly enabled the
external clock using set_clock_source("external").
To do this, I've checked the REF LED in the front panel.
--> Without adding the external clock, the LED is on, therefore it is good
because the external clock is blocked.
--> Adding the external clock, the LED flicks and I do not If the LED
should do this. It is a normal behavior?
Thank in advance. Best!
Alejandro
2018-04-10 18:53 GMT+02:00 Marcus D. Leech <mle...@ripnet.com>:
> 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>:
>
>> 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
>>
>>
>>
>>
>> 2018-04-06 16:00 GMT+02:00 Marcus D. Leech <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>:
>>>
>>>> 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_wit
>>>> h_USRP_Devices
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> USRP-users mailing list
>>>> USRP-users@lists.ettus.com
>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>>
>>>
>>>
>>>
>>
>>
>
>
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