text: #!/usr/bin/env python2
  # -*- coding: utf-8 -*-
  ##################################################
  # GNU Radio Python Flow Graph
  # Title: Top Block
  # Generated: Mon Aug 26 14:46:26 2019
  ##################################################
  
  if __name__ == '__main__':
      import ctypes
      import sys
      if sys.platform.startswith('linux'):
          try:
              x11 = ctypes.cdll.LoadLibrary('libX11.so')
              x11.XInitThreads()
          except:
              print "Warning: failed to XInitThreads()"
  
  from PyQt4 import Qt
  from gnuradio import blocks
  from gnuradio import channels
  from gnuradio import digital
  from gnuradio import eng_notation
  from gnuradio import gr
  from gnuradio import qtgui
  from gnuradio.eng_option import eng_option
  from gnuradio.filter import firdes
  from gnuradio.qtgui import Range, RangeWidget
  from optparse import OptionParser
  import numpy
  import sip
  import sys
  
  
  class top_block(gr.top_block, Qt.QWidget):
  
      def __init__(self):
          gr.top_block.__init__(self, "Top Block")
          Qt.QWidget.__init__(self)
          self.setWindowTitle("Top Block")
          try:
              self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
          except:
              pass
          self.top_scroll_layout = Qt.QVBoxLayout()
          self.setLayout(self.top_scroll_layout)
          self.top_scroll = Qt.QScrollArea()
          self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
          self.top_scroll_layout.addWidget(self.top_scroll)
          self.top_scroll.setWidgetResizable(True)
          self.top_widget = Qt.QWidget()
          self.top_scroll.setWidget(self.top_widget)
          self.top_layout = Qt.QVBoxLayout(self.top_widget)
          self.top_grid_layout = Qt.QGridLayout()
          self.top_layout.addLayout(self.top_grid_layout)
  
          self.settings = Qt.QSettings("GNU Radio", "top_block")
          self.restoreGeometry(self.settings.value("geometry").toByteArray())
  
          ##################################################
          # Variables
          ##################################################
          self.sps = sps = 8
          self.nfilts = nfilts = 128
          self.timing_loop_bandwidth = timing_loop_bandwidth = .063
          self.samp_rate = samp_rate = 32000
          self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), 0.35, 45*nfilts)
          self.noise_voltage = noise_voltage = .063
          self.freq_offset = freq_offset = 0
          
          self.BPSK = BPSK = digital.constellation_calcdist(([-1, 1]), ([0, 1]), 4, 1).base()
          
  
          ##################################################
          # Blocks
          ##################################################
          self._timing_loop_bandwidth_range = Range(.001, .2, .001, .063, 200)
          self._timing_loop_bandwidth_win = RangeWidget(self._timing_loop_bandwidth_range, self.set_timing_loop_bandwidth, "timing_loop_bandwidth", "counter_slider", float)
          self.top_grid_layout.addWidget(self._timing_loop_bandwidth_win, 0,0,1,1)
          self.qtgui_const_sink_x_0_0 = qtgui.const_sink_c(
          	1024, #size
          	"", #name
          	1 #number of inputs
          )
          self.qtgui_const_sink_x_0_0.set_update_time(0.10)
          self.qtgui_const_sink_x_0_0.set_y_axis(-2, 2)
          self.qtgui_const_sink_x_0_0.set_x_axis(-2, 2)
          self.qtgui_const_sink_x_0_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, qtgui.TRIG_SLOPE_POS, 0.0, 0, "")
          self.qtgui_const_sink_x_0_0.enable_autoscale(False)
          self.qtgui_const_sink_x_0_0.enable_grid(True)
          self.qtgui_const_sink_x_0_0.enable_axis_labels(True)
          
          if not True:
            self.qtgui_const_sink_x_0_0.disable_legend()
          
          labels = ['', '', '', '', '',
                    '', '', '', '', '']
          widths = [1, 1, 1, 1, 1,
                    1, 1, 1, 1, 1]
          colors = ["blue", "red", "red", "red", "red",
                    "red", "red", "red", "red", "red"]
          styles = [0, 0, 0, 0, 0,
                    0, 0, 0, 0, 0]
          markers = [0, 0, 0, 0, 0,
                     0, 0, 0, 0, 0]
          alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
                    1.0, 1.0, 1.0, 1.0, 1.0]
          for i in xrange(1):
              if len(labels[i]) == 0:
                  self.qtgui_const_sink_x_0_0.set_line_label(i, "Data {0}".format(i))
              else:
                  self.qtgui_const_sink_x_0_0.set_line_label(i, labels[i])
              self.qtgui_const_sink_x_0_0.set_line_width(i, widths[i])
              self.qtgui_const_sink_x_0_0.set_line_color(i, colors[i])
              self.qtgui_const_sink_x_0_0.set_line_style(i, styles[i])
              self.qtgui_const_sink_x_0_0.set_line_marker(i, markers[i])
              self.qtgui_const_sink_x_0_0.set_line_alpha(i, alphas[i])
          
          self._qtgui_const_sink_x_0_0_win = sip.wrapinstance(self.qtgui_const_sink_x_0_0.pyqwidget(), Qt.QWidget)
          self.top_layout.addWidget(self._qtgui_const_sink_x_0_0_win)
          self.qtgui_const_sink_x_0 = qtgui.const_sink_c(
          	1024, #size
          	"", #name
          	1 #number of inputs
          )
          self.qtgui_const_sink_x_0.set_update_time(0.10)
          self.qtgui_const_sink_x_0.set_y_axis(-2, 2)
          self.qtgui_const_sink_x_0.set_x_axis(-2, 2)
          self.qtgui_const_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, qtgui.TRIG_SLOPE_POS, 0.0, 0, "")
          self.qtgui_const_sink_x_0.enable_autoscale(False)
          self.qtgui_const_sink_x_0.enable_grid(True)
          self.qtgui_const_sink_x_0.enable_axis_labels(True)
          
          if not True:
            self.qtgui_const_sink_x_0.disable_legend()
          
          labels = ['', '', '', '', '',
                    '', '', '', '', '']
          widths = [1, 1, 1, 1, 1,
                    1, 1, 1, 1, 1]
          colors = ["blue", "red", "red", "red", "red",
                    "red", "red", "red", "red", "red"]
          styles = [0, 0, 0, 0, 0,
                    0, 0, 0, 0, 0]
          markers = [0, 0, 0, 0, 0,
                     0, 0, 0, 0, 0]
          alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
                    1.0, 1.0, 1.0, 1.0, 1.0]
          for i in xrange(1):
              if len(labels[i]) == 0:
                  self.qtgui_const_sink_x_0.set_line_label(i, "Data {0}".format(i))
              else:
                  self.qtgui_const_sink_x_0.set_line_label(i, labels[i])
              self.qtgui_const_sink_x_0.set_line_width(i, widths[i])
              self.qtgui_const_sink_x_0.set_line_color(i, colors[i])
              self.qtgui_const_sink_x_0.set_line_style(i, styles[i])
              self.qtgui_const_sink_x_0.set_line_marker(i, markers[i])
              self.qtgui_const_sink_x_0.set_line_alpha(i, alphas[i])
          
          self._qtgui_const_sink_x_0_win = sip.wrapinstance(self.qtgui_const_sink_x_0.pyqwidget(), Qt.QWidget)
          self.top_layout.addWidget(self._qtgui_const_sink_x_0_win)
          self._noise_voltage_range = Range(0.0, 1, .001, .063, 200)
          self._noise_voltage_win = RangeWidget(self._noise_voltage_range, self.set_noise_voltage, "noise_voltage", "counter_slider", float)
          self.top_grid_layout.addWidget(self._noise_voltage_win, 0,1,1,1)
          self.digital_pfb_clock_sync_xxx_0_0 = digital.pfb_clock_sync_ccf(sps, timing_loop_bandwidth, (rrc_taps), nfilts, nfilts/2, 1.5, 1)
          self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, timing_loop_bandwidth, (rrc_taps), nfilts, nfilts/2, 1.5, 1)
          self.digital_constellation_modulator_0 = digital.generic_mod(
            constellation=BPSK,
            differential=False,
            samples_per_symbol=sps,
            pre_diff_code=True,
            excess_bw=0.35,
            verbose=False,
            log=False,
            )
          self.channels_fading_model_0 = channels.fading_model( 8, 10.0/samp_rate, True, 10, 0 )
          self.blocks_throttle_0 = blocks.throttle(gr.sizeof_char*1, samp_rate,True)
          self.analog_random_source_x_0 = blocks.vector_source_b(map(int, numpy.random.randint(0, 256, 1000)), True)
  
          ##################################################
          # Connections
          ##################################################
          self.connect((self.analog_random_source_x_0, 0), (self.blocks_throttle_0, 0))    
          self.connect((self.blocks_throttle_0, 0), (self.digital_constellation_modulator_0, 0))    
          self.connect((self.channels_fading_model_0, 0), (self.digital_pfb_clock_sync_xxx_0_0, 0))    
          self.connect((self.digital_constellation_modulator_0, 0), (self.channels_fading_model_0, 0))    
          self.connect((self.digital_constellation_modulator_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0))    
          self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.qtgui_const_sink_x_0_0, 0))    
          self.connect((self.digital_pfb_clock_sync_xxx_0_0, 0), (self.qtgui_const_sink_x_0, 0))    
  
      def closeEvent(self, event):
          self.settings = Qt.QSettings("GNU Radio", "top_block")
          self.settings.setValue("geometry", self.saveGeometry())
          event.accept()
  
      def get_sps(self):
          return self.sps
  
      def set_sps(self, sps):
          self.sps = sps
          self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), 0.35, 45*self.nfilts))
  
      def get_nfilts(self):
          return self.nfilts
  
      def set_nfilts(self, nfilts):
          self.nfilts = nfilts
          self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), 0.35, 45*self.nfilts))
  
      def get_timing_loop_bandwidth(self):
          return self.timing_loop_bandwidth
  
      def set_timing_loop_bandwidth(self, timing_loop_bandwidth):
          self.timing_loop_bandwidth = timing_loop_bandwidth
          self.digital_pfb_clock_sync_xxx_0_0.set_loop_bandwidth(self.timing_loop_bandwidth)
          self.digital_pfb_clock_sync_xxx_0.set_loop_bandwidth(self.timing_loop_bandwidth)
  
      def get_samp_rate(self):
          return self.samp_rate
  
      def set_samp_rate(self, samp_rate):
          self.samp_rate = samp_rate
          self.channels_fading_model_0.set_fDTs(10.0/self.samp_rate)
          self.blocks_throttle_0.set_sample_rate(self.samp_rate)
  
      def get_rrc_taps(self):
          return self.rrc_taps
  
      def set_rrc_taps(self, rrc_taps):
          self.rrc_taps = rrc_taps
          self.digital_pfb_clock_sync_xxx_0_0.update_taps((self.rrc_taps))
          self.digital_pfb_clock_sync_xxx_0.update_taps((self.rrc_taps))
  
      def get_noise_voltage(self):
          return self.noise_voltage
  
      def set_noise_voltage(self, noise_voltage):
          self.noise_voltage = noise_voltage
  
      def get_freq_offset(self):
          return self.freq_offset
  
      def set_freq_offset(self, freq_offset):
          self.freq_offset = freq_offset
  
      def get_BPSK(self):
          return self.BPSK
  
      def set_BPSK(self, BPSK):
          self.BPSK = BPSK
  
  
  def main(top_block_cls=top_block, options=None):
  
      from distutils.version import StrictVersion
      if StrictVersion(Qt.qVersion()) >= StrictVersion("4.5.0"):
          style = gr.prefs().get_string('qtgui', 'style', 'raster')
          Qt.QApplication.setGraphicsSystem(style)
      qapp = Qt.QApplication(sys.argv)
  
      tb = top_block_cls()
      tb.start()
      tb.show()
  
      def quitting():
          tb.stop()
          tb.wait()
      qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
      qapp.exec_()
  
  
  if __name__ == '__main__':
      main()
  