[USRP-users] Full Duplex w/ X310 & UBX-160

Dave NotTelling dmp250net at gmail.com
Wed Mar 30 13:02:28 EDT 2016


Oh, sorry, I meant that I no longer see the GFSK transmission.  I also
should have added that I don't get a correct spectrum from the RX side *at
all*.  If I disable one of the two chains (disable all TX or RX) then
everything works fine.

On Wed, Mar 30, 2016 at 1:00 PM, <mleech at ripnet.com> wrote:

> What do you mean by "it all breaks down"?  Error messages?
>
>
>
>
>
>
>
>
> On 2016-03-30 12:55, Dave NotTelling wrote:
>
> Marcus,
>
>      This is odd then.  Please see the attached for my example flow graph
> in GNU Radio.  The basics are that I am transmitting a GFSK (just for
> giggles) on 1.001 GHz and receiving on 900 MHz.  When the graph starts up,
> the TX side is working properly.  I can tell this by looking at the output
> of my B200 which is tuned to 1.001 GHz.  The moment I change a parameter
> (RX/TX gain/freq) it all breaks down.  Is this possibly an issue with the
> X300/X310 UHD driver and/or GNU Radio gr-uhd?  Or am I just doing something
> stupid?
>
> Thank you!
>
> -Dave
>
>
>
> On Wed, Mar 30, 2016 at 12:22 PM, <mleech at ripnet.com> wrote:
>
>> The RX and TX synthesizers are totally separate on the UBX, so you can
>> frequency-split however you want.
>>
>> The larger the split, the easier it will be to prevent de-sense between
>> TX and RX, since it would be easy to, for example, insert a notch filter
>> for your TX band into the RX path, etc.
>>
>>
>>
>>
>> On 2016-03-30 11:18, Dave NotTelling via USRP-users wrote:
>>
>> Can I transmit at say 100 MHz while simultaneously receiving at say 1
>> GHz?  If so, can I also use different sampling rates between the TX and RX
>> paths?  Are there any existing examples of how to do simultaneous TX and RX
>> in GNU Radio?
>>
>> If this is not possible, then what is the max frequency difference?  I
>> was assuming that if I were transmitting at 1 GHz, then I could tune the RX
>> side up and down by half the master clock rate.
>>
>> Thank you!
>>
>> -Dave
>>
>> _______________________________________________
>> USRP-users mailing listUSRP-users at lists.ettus.comhttp://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20160330/dea6b858/attachment-0002.html>


More information about the USRP-users mailing list