Re: [Discuss-gnuradio] 2 complex receive channels on usrp n210

[Anisha Gorur]

I am getting complex data around my center frequency, but only on one channel, RXA shows the data, while RXB is just zeros. In my code, I have just added a few lines from rx_samples_to_file.cpp to rx_multi_samples.cpp to make rx_multi_samples write out to a file. This is with the subdevice specs A:A and A:B, should I change those?

On Wed, Sep 19, 2012 at 6:50 PM, Josh Blum <address@hidden> wrote:

On 09/19/2012 04:54 PM, Anisha Gorur wrote:
> I tried this out, and I am getting two real signals, while I want two
> complex signals. From dboards.rst:
>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Basic RX and LFRX
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> The Basic RX and LFRX boards have 4 frontends:
>
> * **Frontend A:** real signal on antenna RXA
> * **Frontend B:** real signal on antenna RXB
> * **Frontend AB:** quadrature frontend using both antennas (IQ)
> * **Frontend BA:** quadrature frontend using both antennas (QI)
>
> So choosing A and B as the subdevice specs would give me two real signals,
> correct?
>

In this case, the DDC chains will zero out Q, and connect A or B to I.
So you will get complex data centered at whatever you tune center
frequency to.

-josh

> On Wed, Sep 19, 2012 at 2:58 PM, Anisha Gorur <address@hidden> wrote:
>
>> Great! So if i selected 0:A and 0:B as multiple subdevices, I would
>> receive something like I0, Q0 and I1, Q1?
>>
>>
>> On Wed, Sep 19, 2012 at 12:45 PM, Josh Blum <address@hidden> wrote:
>>
>>>
>>>
>>> On 09/19/2012 10:44 AM, Anisha Gorur wrote:
>>>> Hello All,
>>>>
>>>> I know that on the USRP1, it was possible to have four seperate RX
>>>> channels, and therefore receive two pairs of IQ samples. I was
>>> wondering if
>>>> there were any way to do this on a USRP N210, using a basic RX
>>>> daughterboard, even by possible changing the FPGA code, or it you could
>>>> only have one pair of IQ samples.
>>>>
>>>
>>> Yes. Same idea, except, the frontend names for Basic RX are A, B, and
>>> AB:
>>>
>>> http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2011-May/001271.html
>>>
>>> -josh
>>>
>>>> Thanks,
>>>> Anisha
>>>>
>>>>
>>>>
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>>>>
>>>
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>>
>>
>>
>> --
>> Anisha Gorur
>> Class of 2012
>> Electrical Engineering
>>
>>
>
>

-- 
Anisha Gorur
Class of 2012
Electrical Engineering