Paul Mathews schrieb:
See 'usrp_am_mw_rcv.py' for an example. Look for the code relating to these lines in particular:if self.use_IF: # Turn If to baseband and filter. self.chan_filt = gr.freq_xlating_fir_filter_ccf (chanfilt_decim, chan_filt_coeffs, self.IF_freq, usrp_rate)
hI pAUL, i used this example as possible as i can, but this frequency translating filter has one important difference to my application, the FFT-Plot-sink which is connected to this xlating filter is staticly. I have a slider to change my baseband to the wished spectrum, so my xlating filter it is dynamically. I still doesn't know whether to use a low_pass is usefull or a band_pass. The low_pass doesn't delete the middle signal in the FFT-Plot in my tryings. Further on i doesn't know which conditions have to be made to let my application work fluidly ? Which decimation ? Which rate is useful ? Should it use the same rate, than the element before ? Which is the centerpoint from which the low_pass_cutoff and the high_pass_cutoff frequency will be counted ? I tried it out, but still doesn't know how it works. Regards Markus _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
