Thanks a lot for the help. In a non Software Radio FM transmitter we have an integrator, local osc, mixer, and RF filter. In this case, I can´t find the integrator and the RF section. why? are not necessary?. Thanks again. Jorge Chavez Mexico
On 11/9/05, cswiger <[EMAIL PROTECTED]> wrote: > > On Wed, 9 Nov 2005, [ISO-8859-1] Jorge Chávez wrote: > > > Hi Everyone: > > I´m looking for a block diagram of the fm_tx4.py, the code is not > totally > > understandable for me, that's why i´m trying to find a diagram. > > > > Hi Jorge - As far as I can make out it looks something like this: > > > pipeline: > > (src|file_source)---->(fmtx|nbfm_tx)------>(mixer|multiply_cc)----> > ^ > | > (lo|sig_source_c)-----------+ > > > > > > (t1:pipeline)--->(sum|add_cc)-->(gain|multiply_const_cc)-->(u:usrp_sink_c) > ^ ^ > (t2:pipeline)-----+ | > | > ... | > | > (tn:pipeline)------------+ > > > > First he creates a hierarchical block called 'pipeline' which takes > filename, local osc freq, audio_rate and if_rate. Then he uses > that in fm_tx_graph in a loop connecting them all to 'sum', then > to 'gain' then out to the usrp hardware. There can be up to 7 'pipeline' > channels. The 't' definition loop is pretty tricky - but he creates > each 't' pipeline with a seperate audio-1.dat file (audio-2.dat, > audio-3.dat, audio-4.dat and then I think it goes back to audio-1.dat) > and a seperate local osc frequency from 'offset', 0, 25, -25, 50, -50, > 75 and -75Khz for each 't' pipeline. Yes, (i % 4) is modulo - > 0,1,2,3,0,1,2,3. > > Good luck. > > --Chuck > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
