Re: [USRP-users] Add an external clock to a USRP x310

[Marcus D. Leech via USRP-users]

On 04/17/2018 09:04 AM, ALEJANDRO BLANCO PIZARRO wrote:

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

The LED should be on solidly.



2018-04-10 18:53 GMT+02:00 Marcus D. Leech >:


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 >:

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
>:

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 >:

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





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Re: [USRP-users] Add an external clock to a USRP x310

[ALEJANDRO BLANCO PIZARRO via USRP-users]

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 :

> 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 :
>
>> 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 :
>>
>>> 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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Re: [USRP-users] Add an external clock to a USRP x310

[Marcus D. Leech via USRP-users]

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 >:


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 >:

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
>:

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





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Re: [USRP-users] Add an external clock to a USRP x310

[ALEJANDRO BLANCO PIZARRO via USRP-users]

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

2018-04-06 16:28 GMT+02:00 Marcus D. Leech :

> 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 :
>
>> 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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Re: [USRP-users] Add an external clock to a USRP x310

[Marcus D. Leech via USRP-users]

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 >:


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
>:

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





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Re: [USRP-users] Add an external clock to a USRP x310

[ALEJANDRO BLANCO PIZARRO via USRP-users]

Hi Marcus,

Thanks a lot! What GPSDO do you recommend? We need to buy one.

Best regards,
Alejandro

2018-04-06 16:00 GMT+02:00 Marcus D. Leech :

> 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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Re: [USRP-users] Add an external clock to a USRP x310

[Marcus D. Leech via USRP-users]

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 
>:


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




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Re: [USRP-users] Add an external clock to a USRP x310

[ALEJANDRO BLANCO PIZARRO via USRP-users]

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

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_with_USRP_Devices
>
>
>
> ___
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>
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Re: [USRP-users] Add an external clock to a USRP x310

[Marcus D. Leech via USRP-users]

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



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