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

Mike Jameson mike.jameson at ettus.com
Fri Sep 19 11:56:09 EDT 2014


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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