Thanks again for the help. I think I better understand how to set the RX mux. I am now working on the multi_file.py example to receive using 2 daughterboards on the same USRP. I want to do the same type of thing using 2 antennas where RX-A and RX-B (on side A) will receive signal 1's I and Q and RX-A and RX-B (on side B) will receive signal 2's I and Q. If my understanding is correct, I would set the mux to (0x32103210). Let me know if this is not correct.
My question now comes on the TX side. I don't quite understand how to set the TX mux. I want to transmit using 2 daughterboards on 1 USRP so I am using the fm_tx_2_daughterboards.py example. I want daughterboard 1 to transmit the I (RX-A) and Q (RX-B) of signal 1 and daughterboard 2 to transmit the I (RX-A) and Q (RX-B) of signal 2. This example uses the command: self.u.set_mux(0xba98) which I don't think is right for what I want to do, but I don't really understand how to set the TX mux in the same way I understand how to set the RX mux (it seems to be different). How would I set the TX mux to do what I want? Thanks Nick ----- Original Message ----- From: Eric Blossom <[EMAIL PROTECTED]> Date: Tuesday, March 20, 2007 10:15 am Subject: Re: [Discuss-gnuradio] Question about Basic TX/RX boards, the I, Q > On Sun, Mar 18, 2007 at 02:46:26PM -0400, [EMAIL PROTECTED] wrote: > > > It's a little confusing to me why the Basic TX does not have a > > problem using both the I and Q channel but the Basic RX does. > > Actually, there's no problem. You can get it to do what you want > by explicitly specifying the rx mux value. > > To feed both A side inputs into the DDC 0 as I & Q, do > > u.set_mux(0x10101010) > > /*! > * \brief Set input mux configuration. > * > * This determines which ADC (or constant zero) is connected to > * each DDC input. There are 4 DDCs. Each has two inputs. > * > * <pre> > * Mux value: > * > * 3 2 1 > > * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 > 1 0 > * +-------+-------+-------+-------+-------+-------+-------+----- > --+ > * | Q3 | I3 | Q2 | I2 | Q1 | I1 | Q0 | > I0 | > * +-------+-------+-------+-------+-------+-------+-------+----- > --+ > * > * Each 4-bit I field is either 0,1,2,3 > * Each 4-bit Q field is either 0,1,2,3 or 0xf (input is const zero) > * All Q's must be 0xf or none of them may be 0xf > * </pre> > */ > bool set_mux (int mux); > > > > > It seems to me that the command "-R a:1" would tell the RX_B > input to > > receive but not the RX_A input anymore. I need both the inputs to > > receive data at the same time, as I/Q channels connected to my RF > > front end. Any insights in how I do this would be much appreciated > > (if my assumption that "-R a:1" would only have the RX_B input > > receive). > > > Thanks > > Nick > > Eric > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
