On Fri, Jul 04, 2008 at 12:21:25PM +1000, Phaysal Khan wrote: > Hi List,I am using an RFX2400 d'board, for IF sampling a signal > which is 20MHz wide, centered at 2.4125GHz. I know it's not possible > to sample whole 20Meg, but I am happy with a 16MHz version at this > stage (which we belive is the widest we can go). I am using
> python usrp_rx_cfile.py -f 2404.5M -s --no-hb -8 -N 40000 data1.dat I'm pretty sure that the 8-bit support is still missing from the FPGA. Until somebody fixes that, the highest rate you'll be able to run at is 8MS/s complex. That's what you'll get with -d 8. > 1. Am I correct in using 2404.5M to downconvert the IF signal at > 10MHz? I need "real" IF samples at 10MHz, do I need to change > something here? You set the frequency that you want to appear at DC in the complex baseband. > 2. this frequency in the above command is LO frequency or incoming > signal frequency? The -f <freq> argument is the RF frequency that you want to appear at zero in the complex baseband. > 3. My signal is in the range 2402.5-2422.5MHz range, which is well > with in defined range of RFX2400 (2.4-2.483GHz), do I still need to > cut lines for ISM filter on-board, as one of my project mates was > advised to do. If yes, can't I use the other signal input on the > board, which hasn't got any filter around it? > 4. when I look at the spectrum of the IF samples collected using > above command, they appear to have lesser bandwidth (4MHz) than the > expected bandwidth(20MHz). With -d 8 you'll get 64M/8 = 8MS/s complex. That'll be +/- 4MHz. > Sorry if any/all of these questions sound stupid, but consider me > novice :S Welcome! Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
