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

Mike Jameson mike.jameson at ettus.com
Fri Sep 19 13:17:46 EDT 2014


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
>>
>>
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>>
>>
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>>
>
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