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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: Analyse RTLSDR capture
# Author: HB9EGM
# GNU Radio version: 3.7.13.5
##################################################
from gnuradio import analog
from gnuradio import blocks
from gnuradio import digital
from gnuradio import digital;import cmath
from gnuradio import eng_notation
from gnuradio import filter
from gnuradio import gr
from gnuradio.eng_option import eng_option
from gnuradio.filter import firdes
from optparse import OptionParser
import pmt
class analyse_capture(gr.top_block):
def __init__(self):
gr.top_block.__init__(self, "Analyse RTLSDR capture")
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 2048000
self.taps = taps = firdes.low_pass(1.0/256, samp_rate, 3e3, 10e2, firdes.WIN_HAMMING, 6.76)
self.decim = decim = 16
self.audio_rate = audio_rate = int(32e3)
##################################################
# Blocks
##################################################
self.low_pass_filter_0 = filter.fir_filter_ccf(4, firdes.low_pass(
1, audio_rate, 200, 20, firdes.WIN_HAMMING, 6.76))
self.freq_xlating_fft_filter_ccc_0 = filter.freq_xlating_fft_filter_ccc(decim, (taps), 145725e3-145700e3, samp_rate)
self.freq_xlating_fft_filter_ccc_0.set_nthreads(1)
self.freq_xlating_fft_filter_ccc_0.declare_sample_delay(0)
self.digital_mpsk_receiver_cc_0 = digital.mpsk_receiver_cc(2, 0, cmath.pi/100.0, -0.25, 0.25, 0.25, 0.04, 64, 64*64/4, 0.005)
self.digital_diff_phasor_cc_0 = digital.diff_phasor_cc()
self.digital_binary_slicer_fb_0 = digital.binary_slicer_fb()
self.blocks_uchar_to_float_0_0 = blocks.uchar_to_float()
self.blocks_uchar_to_float_0 = blocks.uchar_to_float()
self.blocks_multiply_xx_0 = blocks.multiply_vcc(1)
self.blocks_float_to_complex_1 = blocks.float_to_complex(1)
self.blocks_float_to_complex_0 = blocks.float_to_complex(1)
self.blocks_file_source_0 = blocks.file_source(gr.sizeof_char*1, './iq.raw', False)
self.blocks_file_source_0.set_begin_tag(pmt.PMT_NIL)
self.blocks_file_sink_0 = blocks.file_sink(gr.sizeof_char*1, './psk125.bit', False)
self.blocks_file_sink_0.set_unbuffered(False)
self.blocks_deinterleave_0 = blocks.deinterleave(gr.sizeof_char*1, 1)
self.blocks_complex_to_float_0 = blocks.complex_to_float(1)
self.analog_sig_source_x_1 = analog.sig_source_c(audio_rate, analog.GR_COS_WAVE, 588, 1, 0)
self.analog_nbfm_rx_0 = analog.nbfm_rx(
audio_rate=audio_rate,
quad_rate=samp_rate/decim,
tau=75e-6,
max_dev=5e3,
)
self.analog_const_source_x_0 = analog.sig_source_f(0, analog.GR_CONST_WAVE, 0, 0, 0)
self.analog_agc_xx_0 = analog.agc_ff(1e-4, 0.2, 1.0)
self.analog_agc_xx_0.set_max_gain(1)
##################################################
# Connections
##################################################
self.connect((self.analog_agc_xx_0, 0), (self.blocks_float_to_complex_1, 0))
self.connect((self.analog_const_source_x_0, 0), (self.blocks_float_to_complex_1, 1))
self.connect((self.analog_nbfm_rx_0, 0), (self.analog_agc_xx_0, 0))
self.connect((self.analog_sig_source_x_1, 0), (self.blocks_multiply_xx_0, 1))
self.connect((self.blocks_complex_to_float_0, 0), (self.digital_binary_slicer_fb_0, 0))
self.connect((self.blocks_deinterleave_0, 0), (self.blocks_uchar_to_float_0, 0))
self.connect((self.blocks_deinterleave_0, 1), (self.blocks_uchar_to_float_0_0, 0))
self.connect((self.blocks_file_source_0, 0), (self.blocks_deinterleave_0, 0))
self.connect((self.blocks_float_to_complex_0, 0), (self.freq_xlating_fft_filter_ccc_0, 0))
self.connect((self.blocks_float_to_complex_1, 0), (self.blocks_multiply_xx_0, 0))
self.connect((self.blocks_multiply_xx_0, 0), (self.low_pass_filter_0, 0))
self.connect((self.blocks_uchar_to_float_0, 0), (self.blocks_float_to_complex_0, 0))
self.connect((self.blocks_uchar_to_float_0_0, 0), (self.blocks_float_to_complex_0, 1))
self.connect((self.digital_binary_slicer_fb_0, 0), (self.blocks_file_sink_0, 0))
self.connect((self.digital_diff_phasor_cc_0, 0), (self.blocks_complex_to_float_0, 0))
self.connect((self.digital_mpsk_receiver_cc_0, 0), (self.digital_diff_phasor_cc_0, 0))
self.connect((self.freq_xlating_fft_filter_ccc_0, 0), (self.analog_nbfm_rx_0, 0))
self.connect((self.low_pass_filter_0, 0), (self.digital_mpsk_receiver_cc_0, 0))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
def get_taps(self):
return self.taps
def set_taps(self, taps):
self.taps = taps
self.freq_xlating_fft_filter_ccc_0.set_taps((self.taps))
def get_decim(self):
return self.decim
def set_decim(self, decim):
self.decim = decim
def get_audio_rate(self):
return self.audio_rate
def set_audio_rate(self, audio_rate):
self.audio_rate = audio_rate
self.low_pass_filter_0.set_taps(firdes.low_pass(1, self.audio_rate, 200, 20, firdes.WIN_HAMMING, 6.76))
self.analog_sig_source_x_1.set_sampling_freq(self.audio_rate)
def main(top_block_cls=analyse_capture, options=None):
tb = top_block_cls()
tb.start()
tb.wait()
if __name__ == '__main__':
main()
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