On Sat, Jun 13, 2009 at 02:31:59AM +0200, Sebastiaan Heunis wrote: > Jason > > From what I've picked up, you need two external sampled signals to get > an I-Q signal. With the TV tuner daughterboard, you automatically get > two signals. You just need to set the mux accordingly. When you use > a BasicRX, you need to feed the same signal to both inputs and use a > mux value of 0x32103210.
If you use the standard interfaces, you don't have to do anything. You always get a valid complex baseband signal. The daughterboard code knows which boards have a single real output and which have quadrature inputs. In the single real case (e.g., TVRX), the library configures the mux such that it feeds the single input into the I side of the DDC and connects a constant zero into the Q side. The output of the DDC is always complex. In the case of daughterboards with quadrature output, one input is connected to the I input of the DDC and the other is connected to the Q input. See http://gnuradio.org/trac/wiki/UsrpRfxDiagrams Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
