On Tue, Apr 03, 2007 at 09:50:20AM -0400, [EMAIL PROTECTED] wrote: > I can't get the output to the fm_tx_2_daughterbaords.py example to > work. I am testing with 2 complex signals and on each signal, the > I channel is a sinusoid and the Q channel is a sinusoid of a > different frequency. I have connected each of the 4 SMA > connectors from the 2 Basic TX daughterboards to a different > channel on an oscope. I expect to see a sinusoid on each channel > but that is not the case. I see some weird waveform on the > different channels on the oscope. Originally I didn't think the > TX mux was set correct because the comments at the beginning of > the example says that it transmits SSB (USB) and that is not what > I'm looking for. I want each of the 4 different waveforms (2 > sines on the I's and 2 sines on the Q's, all with different > frequencies) to come out of the 4 SMA connectors. Any help would > be greatly appreciated. > > Thanks, > Nick
Nick, Without a serious amount of hacking you're not going to be able to get 4 unrelated signals out of 2 Basic Tx's, and if you could, you'd lose the digital upconverters. Each I/Q pair is sent through a DUC (in the AD9862) that computes the equivalent of OUT = IN * exp(jwt) where IN is the I/Q input and OUT is the I/Q output, and w is the freqency of the digital LO. Given how the DUC works, you can't treat the I and Q as if they were totally unrelated. There's a reason they're called I and Q, not I1 and I2. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
