[Discuss-gnuradio] Using the USRP LFRX daughterboard to receive a complex baseband signal (I+Q)

[Einar Thorsrud]

Hi all,

I am having difficulties understanding how to combine the two signals on 
the RXA and RXB connectors on the same LFRX-daughterboard to one single 
complex signal (I+Q) using the "usrp_dual_source_x" block.

The best would be to receive a float from each, and then combine the two 
signals to a complex signal using the "gr_float_to_complex" block. 
However it seems it is only possible to get the samples as short or 
complex, so my idea is to take the real part of each of the two 
“complex” signals (as they in reality are real), and combine those to 
complex using the above mentioned block.

This method involves some seemingly unnecessary conversions, so I am 
guessing that there is another way?

- Einar