It's known that the channel band width is 200KHz When looking into airprobe, gsm_receiver.py
the cutoff freq in xlating is 145KHz, Can anyone kindly to explain. Thanks! filter_cutoff = 145e3 filter_t_width = 10e3 filter_taps = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING) filtr = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate)
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