On Sat, May 20, 2006 at 08:59:00PM -0700, rdmiller wrote: > > Eric, > > Thank you very much for the reply. I noticed that I was actually modifying > a very old version of usrp_rx_cfile.py (found at > http://www.koders.com/python/fidB649E66943F7649C67371CB015D6E5ACAE276523.aspx). > > I've taken a look at the latest version from cvs and have a question > regarding the proper way to add the call to select_rx_antenna( ). It > appears that the mux value is set based upon user input or another method, > and that this may result in improper operation using RX2. I've tried > setting the rx_subdev_spec to 'RX2' from the command line argument with > error. The message is to use 'A', 'A:0', or 'A:1' when using the A side of > the usrp. When trying 'A:1', an error also results. So, when I run the > code I am using 'A:0' as the input. I am therefore fearful of having bad > mux values even though the modified code (listed below) runs without error > in terms of creating the data file. My question is whether or not there is > a simple alteration to the code below that will result in using RX2 for > receiving data while transmitting simultaneously from RX/TX?
The subdevice spec has to do with selecting either the daughterboard on the A or B side. It has nothing to do with the selection of the TX/RX vs RX2 antenna port. The mux is set up depending on the A vs B selection. Your code looks right. Sorry, not near a USRP to test it right now. > Although I am aware that the signal will need to be attenuated severely, I > am unsure what the RF front end of the RFX-400 is spec'd for. With a 20 dBm > signal at the TX, I am planning to use anywhere from 40 to 60 dB of > attenuation. I believe this will give me a -20 to -40 dBm signal at RX2. > This should be acceptable, right? Thanks again for your help, it is much > appreciated. I'm not sure. Matt's the guy to answer this (unless it's already on the daughterboard data sheet). He's at the Dayton Hamvention now ;) Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
