[USRP-users] X310 + 2 CBX daughtercards strange behaviour

Michael West michael.west at ettus.com
Fri Sep 19 16:23:04 EDT 2014


Hi Hervé,

Try setting "Stream channels" to [0,1].

Regards,
Michael

On Fri, Sep 19, 2014 at 1:02 PM, boeglen herve via USRP-users <
usrp-users at lists.ettus.com> wrote:

>  Hi Markus and Mike,
>
> Thank you for your answers.
>
> It does not change anything whether you specify the subdev or not.
>
> Markus: yes everything is wired properly. Concerning the last email, I
> used a BladeRF as a generator (0dBm + 30dB attenuator).
>
> Here is another test with Wifi and as you can see from the two spectrum
> scopes (upper is RF 1, lower RF 0), RF 1 reception bandwith seems to be
> larger than for RF 0 (however it's set to 20MHz for both channels).
>
> I have a second X310 with the same daugthercards and I get the same
> behaviour...
>
> Is there a way to use just RF 1?
>
> I hope that going to sleep is going to help me to find an idea to solve
> the problem :-)
>
> Best regards
>
> Hervé
>
> On Fri, 19 Sep 2014 18:17:46 +0100, Mike Jameson wrote:
>
>  The subdev spec should actually be:
>
> A:0 B:0
>
> (Thanks Marcus.L!)
>
>  Mike
>
> --
> Mike Jameson M0MIK BSc MIET
> Ettus Research Technical Support
> Email: support at ettus.com
> Web: http://ettus.com
>
> On Fri, Sep 19, 2014 at 4:56 PM, Mike Jameson <mike.jameson at ettus.com>
> wrote:
>
>>  I'm not fortunate enough to have an X310 to test this myself, however
>> it looks as though you are missing a subdev spec which should be something
>> like:
>>
>> "A:A B:A"
>>
>> More information here:
>>
>> http://files.ettus.com/manual/page_usrp_x3x0.html#x3x0_misc_multirx
>>
>>  Mike
>>
>> --
>> Mike Jameson M0MIK BSc MIET
>> Ettus Research Technical Support
>> Email: support at ettus.com
>> Web: http://ettus.com
>>
>> On Fri, Sep 19, 2014 at 4:14 PM, Marcus D. Leech via USRP-users <
>> usrp-users at lists.ettus.com> wrote:
>>
>>>  Are you certain that you've wired the TX/RX ports of the two CBX to
>>> the front-panel correctly?
>>>
>>>
>>>
>>> What signal levels are you injecting?
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 2014-09-17 11:19, boeglen herve via USRP-users wrote:
>>>
>>>  Hi all,
>>>
>>> I am playing with an USRP X310 + 2 CBX dautercards (RF 0 and RF 1). My
>>> aim is to perform a 2 antennas reception. However, when testing the two RF
>>> inputs, RF 1 doesn't seem to work properly. With a generator,  I just enter
>>> a sum of 2 sines (100 kHz and 200 kHz) around a 3 GHz carrier, firstly on
>>> RF 0 then on RF 1.
>>>
>>> Here are the results ( RF 0 and RF 1). The last image is a screenshot of
>>> my GRC UHD source. It seems like RF 1 has a much wider noise bandwidth than
>>> RF 0 and as you can notice the signal amplitude is 10 dB lower than the one
>>> observed on RF 0.
>>>
>>> Am I doing something wrong? As I understood from the X310 datasheet, it
>>> should be possible to receive or transmit simultaneously wiith an X310
>>> equipped with 2 daughterboards.
>>>
>>> Best regards
>>>
>>> Hervé
>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing listUSRP-users at lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>
>>>
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>>>
>>>
>
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