On 05/04/2013 01:22 PM, Wolfgang Buesser wrote: > Hi I am using a usrp1 populated with 2LF-RX and 2LF-TX daughterboards. > > I am trying to learn how to use this hardware with the 'new' > uhd-interface. > > I am trying tx_waveforms. Using --subdev A:A or B:A I can select the two > daughterbords. But how can I select a single output on either of the 2 > boards? > > I always get signals on both outputs of either board - irrespective of > wether I specify --subdev A:A, A:B or A:AB >
Well, we should be driving zeros into one of the DACs inputs: https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/usrp1/usrp1_calc_mux.hpp#L95 Are you setting a non zero center frequency? There is no CORDIC in the usrp1 TX chain, so if you set a center frequency, the DAC would actually perform the mixing, and you would see something on both outputs. -josh > Thanks > > Wolfgang > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
