Jason, Ah this is exactly what I have been grappling with as well. Basically you need to set the MUX _such that_ you can access the two setting simultaneously. If you have the gnuradio source you, look at the file gnuradio-examples/multi-antenna/multi_scope.py which tells you how you can look at 4 signals at the same time using two BASIC-RX boards.For more than one signal, you can no longer use the usrp.determine_rx_mux_value(u,rx_subdev_spec) method. Instead you have to set the MUX by hand. The crucial line in the example code is.
self.u.set_mux(gru.hexint(0xf3f2f1f0)) This sets all the Q channels to zero (because of 0xf) and routes ADC0 to I0, ADC1 to I1 etc. To separate them you have the line gr.deinterleave(gr.sizeof_gr_complex) I have yet to try this out on my own program, but that is as far as I understand it. I believe If you want to get 4 signals simultaneously you need load a special FPGA image file, the details of which are shown in the example. However for getting only 2 signals the standard FGPA config is good enough (there is an earlier post on this somewhere in the archive). Maybe others can correct me if I am wrong. Karthik On Feb 11, 2008 9:05 PM, Jason Anders <[EMAIL PROTECTED]> wrote: > > Hi! Thanks for your reply. It was helpful! > > However, I have another follow-up question. So, basically I won't be able > to access RX-A and RX-B simultaneously since I have to set the MUX > everytime? Is this correct? > > Thanks! > -- www.stanford.edu/~karthikv _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
