On Tue, Jan 06, 2009 at 10:41:22AM -0300, Ronaldo Nunez wrote: > Thank you for your answer Mr. Blossom, > So, the tx path is something like this: > > PC --> USB --> CIC(FPGA) --> AD9862 --> Daughter Board --> Antenna > > There is two frequencies involved in all transmissions: > * A signal frequency (f_signal), generated by sig_source_c(). > * A RF frequency (f_tx), set with target_freq in tune(). > > The signal (which frequency is f_signal) is interpolated by a factor between > 4 and 512 on CIC interpolator, > after it is up converted to the RF frequency (by the NCO on fine modulator), > so it is moved +- fdac/4 or fdac/8 on coarse modulator. > The signal will be converted to analog (DAC) and amplified and transmitted. > > > Be free to correct me, I need to know exactly how USRP and GNUradio works.
Yes, you've got the basic path right. Please see also the USRP FAQ, available here http://gnuradio.org/trac/wiki/UsrpFAQ or as a pdf http://gnuradio.org/trac/attachment/wiki/UsrpFAQ/USRP_Documentation.pdf Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
