diff --git a/python/trx/CMakeLists.txt b/python/trx/CMakeLists.txt
index d8e9164..4049e54 100644
--- a/python/trx/CMakeLists.txt
+++ b/python/trx/CMakeLists.txt
@@ -24,5 +24,7 @@
     ctrl_if.py
     ctrl_if_bb.py
     fake_pm.py
-    radio_if.py DESTINATION ${GR_PYTHON_DIR}/grgsm/trx
+    radio_if.py
+    radio_if_grc.py
+    DESTINATION ${GR_PYTHON_DIR}/grgsm/trx
 )
diff --git a/python/trx/__init__.py b/python/trx/__init__.py
index 81e569c..5d193b5 100644
--- a/python/trx/__init__.py
+++ b/python/trx/__init__.py
@@ -24,4 +24,5 @@
 from ctrl_if import ctrl_if
 from ctrl_if_bb import ctrl_if_bb
 from fake_pm import fake_pm
+from radio_if_grc import radio_if_grc
 from radio_if import radio_if
diff --git a/python/trx/radio_if.py b/python/trx/radio_if.py
index 689f074..9e97277 100644
--- a/python/trx/radio_if.py
+++ b/python/trx/radio_if.py
@@ -2,9 +2,10 @@
 # -*- coding: utf-8 -*-
 
 # GR-GSM based transceiver
-# Follow graph implementation
+# Extending a GRC flowgraph gr-gsm/examples/trx_radio_if/radio_if_grc.grc
 #
 # (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
+# (C) 2017      by Piotr Krysik <ptrkrysik@gmail.com>
 #
 # All Rights Reserved
 #
@@ -22,229 +23,37 @@
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-import pmt
-import time
-import grgsm
-import osmosdr
+from grgsm.trx import radio_if_grc
 
-from math import pi
-
-from gnuradio.filter import firdes
-from gnuradio import digital
-from gnuradio import blocks
-from gnuradio import uhd
-from gnuradio import gr
-
-
-# HACK: should be implemented in C++!
-import numpy as np
-
-class burst_type_filter(gr.sync_block):
-    def __init__(self, burst_types=[]):
-        gr.sync_block.__init__(
-            self,
-            name='Burst type filter',
-            in_sig=[],
-            out_sig=[]
-        )
-        self.burst_types = burst_types
-        self.message_port_register_in(pmt.intern("bursts_in"))
-        self.message_port_register_out(pmt.intern("bursts_out"))
-        self.set_msg_handler(pmt.intern("bursts_in"), self.filter)
-
-    def filter(self, msg):
-        burst_with_header = pmt.to_python(pmt.cdr(msg))
-        burst = burst_with_header[-148:]
-        header = np.ndarray.tolist(burst_with_header[0:-148])
-        burst_type = header[12]
-        if burst_type in self.burst_types:
-            self.message_port_pub(pmt.intern("bursts_out"), msg)
-
-class burst_to_fn_time(gr.basic_block):
-    def __init__(self):  # only default arguments here
-        gr.basic_block.__init__(
-            self,
-            name='Burst to fn_time',
-            in_sig=[],
-            out_sig=[]
-        )
-        self.message_port_register_in(pmt.intern("bursts_in"))
-        self.message_port_register_out(pmt.intern("fn_time_out"))
-        self.set_msg_handler(pmt.intern("bursts_in"), self.convert)
-
-    def convert(self, msg):
-        fn_time = pmt.dict_ref(pmt.car(msg),pmt.intern("fn_time"),pmt.PMT_NIL)
-        fn_time_msg = pmt.dict_add(pmt.make_dict(), pmt.intern("fn_time"), fn_time)
-        if pmt.to_python(fn_time) is not None:
-            self.message_port_pub(pmt.intern("fn_time_out"), fn_time_msg)
-
-class radio_if(gr.top_block):
-	# PHY specific variables
-	rx_freq = 935e6
-	tx_freq = 890e6
-
+class radio_if(radio_if_grc):
 	# Application state flags
 	trx_started = False
 
-	# GSM timings
-	delay_correction = 285.616e-6
-	ul_dl_shift = -(6.0/1625000*(156.25)*3)
-
 	def __init__(self, phy_args, phy_sample_rate,
 			phy_rx_gain, phy_tx_gain, phy_ppm,
 			phy_rx_antenna, phy_tx_antenna,
-			trx_remote_addr, trx_base_port):
+			trx_remote_addr, trx_base_port,
+			phy_tx_freq=938900000,
+			phy_rx_freq=938900000-45e6,
+			delay_correction=285.616e-6,
+			uplink_shift=-(6.0/1625000*(156.25)*3),
+			timing_advance=0):
 
 		print("[i] Init Radio interface")
 
-		# PHY specific variables
-		self.rx_gain = phy_rx_gain
-		self.tx_gain = phy_tx_gain
-
-		gr.top_block.__init__(self, "GR-GSM TRX")
-
-		# TRX Burst Interface
-		self.trx_burst_if = grgsm.trx_burst_if(
-			trx_remote_addr, str(trx_base_port))
-
-
-		# RX path definition
-		self.phy_src = uhd.usrp_source(phy_args,
-			uhd.stream_args(cpu_format="fc32",
-				channels=range(1)))
-
-		self.phy_src.set_center_freq(self.rx_freq, 0)
-		self.phy_src.set_antenna(phy_rx_antenna, 0)
-		self.phy_src.set_samp_rate(phy_sample_rate)
-		self.phy_src.set_bandwidth(650e3, 0)
-		self.phy_src.set_gain(phy_rx_gain)
-
-		self.gsm_input = grgsm.gsm_input(
-			ppm = phy_ppm - int(phy_ppm), osr = 4,
-			fc = self.rx_freq, samp_rate_in = phy_sample_rate)
-
-		self.gsm_receiver = grgsm.receiver(4, ([0]), ([]))
-
-		self.gsm_clck_ctrl = grgsm.clock_offset_control(
-			self.rx_freq, phy_sample_rate, osr = 4)
-
-		self.ts_filter = grgsm.burst_timeslot_filter(0)
-		self.ts_filter.set_policy(grgsm.FILTER_POLICY_DROP_ALL)
-
-		# Connections
-		self.connect(
-			(self.phy_src, 0),
-			(self.gsm_input, 0))
-
-		self.connect(
-			(self.gsm_input, 0),
-			(self.gsm_receiver, 0))
-
-		self.msg_connect(
-			(self.gsm_receiver, 'C0'),
-			(self.ts_filter, 'in'))
-
-		self.msg_connect(
-			(self.ts_filter, 'out'),
-			(self.trx_burst_if, 'bursts'))
-
-		self.msg_connect(
-			(self.gsm_receiver, 'measurements'),
-			(self.gsm_clck_ctrl, 'measurements'))
-
-		self.msg_connect(
-			(self.gsm_clck_ctrl, 'ctrl'),
-			(self.gsm_input, 'ctrl_in'))
-
-
-		# TX Path Definition
-		self.phy_sink = uhd.usrp_sink(phy_args,
-			uhd.stream_args(cpu_format="fc32",
-				channels=range(1)), "packet_len")
-
-		self.phy_sink.set_antenna(phy_tx_antenna, 0)
-		self.phy_sink.set_samp_rate(phy_sample_rate)
-		self.phy_sink.set_center_freq(self.tx_freq, 0)
-		self.phy_sink.set_gain(self.tx_gain)
-
-		self.tx_time_setter = grgsm.txtime_setter(
-			0xffffffff, 0, 0, 0, 0, 0,
-			self.delay_correction + self.ul_dl_shift)
-
-		self.tx_burst_proc = grgsm.preprocess_tx_burst()
-
-		self.pdu_to_tagged_stream = blocks.pdu_to_tagged_stream(
-			blocks.byte_t, 'packet_len')
-
-		self.gmsk_mod = grgsm.gsm_gmsk_mod(
-			BT = 4, pulse_duration = 4, sps = 4)
-
-		self.burst_shaper = digital.burst_shaper_cc(
-			(firdes.window(firdes.WIN_HANN, 16, 0)),
-			0, 20, False, "packet_len")
-
-		# Connections
-		self.msg_connect(
-			(self.trx_burst_if, 'bursts'),
-			(self.tx_time_setter, 'bursts_in'))
-
-		self.msg_connect(
-			(self.tx_time_setter, 'bursts_out'),
-			(self.tx_burst_proc, 'bursts_in'))
-
-		self.msg_connect(
-			(self.tx_burst_proc, 'bursts_out'),
-			(self.pdu_to_tagged_stream, 'pdus'))
-
-		self.connect(
-			(self.pdu_to_tagged_stream, 0),
-			(self.gmsk_mod, 0))
-
-		self.connect(
-			(self.gmsk_mod, 0),
-			(self.burst_shaper, 0))
-
-		self.connect(
-			(self.burst_shaper, 0),
-			(self.phy_sink, 0))
-
-
-		# RX & TX synchronization
-		self.bt_filter = burst_type_filter([3])
-		self.burst_to_fn_time = burst_to_fn_time()
-
-		# Connections
-		self.msg_connect(
-			(self.gsm_receiver, 'C0'),
-			(self.bt_filter, 'bursts_in'))
-
-		self.msg_connect(
-			(self.bt_filter, 'bursts_out'),
-			(self.burst_to_fn_time, 'bursts_in'))
-
-		self.msg_connect(
-			(self.burst_to_fn_time, 'fn_time_out'),
-			(self.tx_time_setter, 'fn_time'))
+		radio_if_grc.__init__(self,
+			samp_rate=phy_sample_rate, 
+			tx_gain=phy_tx_gain, rx_gain=phy_rx_gain,
+			tx_freq=phy_tx_freq, rx_freq=phy_rx_freq,
+			osr=4, ppm=phy_ppm, 
+			trx_base_port=str(trx_base_port),
+			trx_remote_addr=trx_remote_addr,
+			delay_correction=delay_correction,
+			uplink_shift=uplink_shift,
+			timing_advance=timing_advance)
 
 	def shutdown(self):
 		print("[i] Shutdown Radio interface")
 		self.stop()
 		self.wait()
 
-	def set_rx_freq(self, fc):
-		self.phy_src.set_center_freq(fc, 0)
-		self.gsm_clck_ctrl.set_fc(fc)
-		self.gsm_input.set_fc(fc)
-		self.rx_freq = fc
-
-	def set_tx_freq(self, fc):
-		self.phy_sink.set_center_freq(fc, 0)
-		self.tx_freq = fc
-
-	def set_rx_gain(self, gain):
-		self.phy_src.set_gain(gain, 0)
-		self.rx_gain = gain
-
-	def set_tx_gain(self, gain):
-		self.phy_sink.set_gain(gain, 0)
-		self.tx_gain = gain
diff --git a/python/trx/radio_if_grc.py b/python/trx/radio_if_grc.py
new file mode 100755
index 0000000..26c1f22
--- /dev/null
+++ b/python/trx/radio_if_grc.py
@@ -0,0 +1,259 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+##################################################
+# GNU Radio Python Flow Graph
+# Title: Trx radio interface
+# Author: (C) Piotr Krysik 2017
+# Description: Alpha version of trx radio interface
+# Generated: Thu Nov 30 12:45:52 2017
+##################################################
+
+from gnuradio import blocks
+from gnuradio import digital
+from gnuradio import eng_notation
+from gnuradio import filter
+from gnuradio import gr
+from gnuradio import uhd
+from gnuradio.eng_option import eng_option
+from gnuradio.filter import firdes
+from grgsm import gsm_gmsk_mod
+from optparse import OptionParser
+import grgsm
+import math
+import time
+
+
+class radio_if_grc(gr.top_block):
+
+    def __init__(self, delay_correction=285.616e-6, osr=4, ppm=-1, rx_freq=938600000, rx_gain=40, samp_rate=13e6/12.0, timing_advance=0, trx_base_port="5700", trx_remote_addr="127.0.0.1", tx_freq=938900000, tx_gain=30, uplink_shift=-(6.0/1625000*(156.25)*3)):
+        gr.top_block.__init__(self, "Trx radio interface")
+
+        ##################################################
+        # Parameters
+        ##################################################
+        self.delay_correction = delay_correction
+        self.osr = osr
+        self.ppm = ppm
+        self.rx_freq = rx_freq
+        self.rx_gain = rx_gain
+        self.samp_rate = samp_rate
+        self.timing_advance = timing_advance
+        self.trx_base_port = trx_base_port
+        self.trx_remote_addr = trx_remote_addr
+        self.tx_freq = tx_freq
+        self.tx_gain = tx_gain
+        self.uplink_shift = uplink_shift
+
+        ##################################################
+        # Blocks
+        ##################################################
+        self.uhd_usrp_source_0 = uhd.usrp_source(
+        	",".join(("", "")),
+        	uhd.stream_args(
+        		cpu_format="fc32",
+        		channels=range(1),
+        	),
+        )
+        self.uhd_usrp_source_0.set_clock_rate(26e6, uhd.ALL_MBOARDS)
+        self.uhd_usrp_source_0.set_samp_rate(samp_rate)
+        self.uhd_usrp_source_0.set_center_freq(rx_freq, 0)
+        self.uhd_usrp_source_0.set_gain(rx_gain, 0)
+        self.uhd_usrp_source_0.set_antenna("RX2", 0)
+        self.uhd_usrp_sink_0 = uhd.usrp_sink(
+        	",".join(("", "")),
+        	uhd.stream_args(
+        		cpu_format="fc32",
+        		channels=range(1),
+        	),
+        	"packet_len",
+        )
+        self.uhd_usrp_sink_0.set_clock_rate(26e6, uhd.ALL_MBOARDS)
+        self.uhd_usrp_sink_0.set_subdev_spec("A:B", 0)
+        self.uhd_usrp_sink_0.set_samp_rate(samp_rate)
+        self.uhd_usrp_sink_0.set_center_freq(tx_freq, 0)
+        self.uhd_usrp_sink_0.set_gain(tx_gain, 0)
+        self.uhd_usrp_sink_0.set_antenna("TX/RX", 0)
+        self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass(
+        	1, samp_rate, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
+        self.gsm_txtime_setter_0 = grgsm.txtime_setter(None if (None is not None) else 0xffffffff, 0, 0, 0, 0, timing_advance, delay_correction+uplink_shift)
+        self.gsm_trx_burst_if_0 = grgsm.trx_burst_if(trx_remote_addr, trx_base_port)
+        self.gsm_receiver_0 = grgsm.receiver(4, ([0]), ([4]), False)
+        self.gsm_preprocess_tx_burst_0 = grgsm.preprocess_tx_burst()
+        self.gsm_msg_to_tag_0_0 = grgsm.msg_to_tag()
+        self.gsm_msg_to_tag_0 = grgsm.msg_to_tag()
+        self.gsm_gmsk_mod_0 = gsm_gmsk_mod(
+            BT=0.3,
+            pulse_duration=4,
+            sps=osr,
+        )
+        self.gsm_controlled_rotator_cc_0_0 = grgsm.controlled_rotator_cc(-ppm/1.0e6*2*math.pi*tx_freq/samp_rate)
+        self.gsm_controlled_rotator_cc_0 = grgsm.controlled_rotator_cc(ppm/1.0e6*2*math.pi*rx_freq/samp_rate)
+        self.gsm_burst_type_filter_0 = grgsm.burst_type_filter(([3]))
+        self.gsm_burst_to_fn_time_0 = grgsm.burst_to_fn_time()
+        self.digital_burst_shaper_xx_0 = digital.burst_shaper_cc((firdes.window(firdes.WIN_HANN, 16, 0)), 0, 20, False, "packet_len")
+        self.blocks_pdu_to_tagged_stream_0_0 = blocks.pdu_to_tagged_stream(blocks.byte_t, "packet_len")
+
+        ##################################################
+        # Connections
+        ##################################################
+        self.msg_connect((self.gsm_burst_to_fn_time_0, 'fn_time_out'), (self.gsm_txtime_setter_0, 'fn_time'))    
+        self.msg_connect((self.gsm_burst_type_filter_0, 'bursts_out'), (self.gsm_burst_to_fn_time_0, 'bursts_in'))    
+        self.msg_connect((self.gsm_preprocess_tx_burst_0, 'bursts_out'), (self.blocks_pdu_to_tagged_stream_0_0, 'pdus'))    
+        self.msg_connect((self.gsm_receiver_0, 'C0'), (self.gsm_burst_type_filter_0, 'bursts_in'))    
+        self.msg_connect((self.gsm_receiver_0, 'C0'), (self.gsm_trx_burst_if_0, 'bursts'))    
+        self.msg_connect((self.gsm_trx_burst_if_0, 'bursts'), (self.gsm_txtime_setter_0, 'bursts_in'))    
+        self.msg_connect((self.gsm_txtime_setter_0, 'bursts_out'), (self.gsm_preprocess_tx_burst_0, 'bursts_in'))    
+        self.connect((self.blocks_pdu_to_tagged_stream_0_0, 0), (self.gsm_gmsk_mod_0, 0))    
+        self.connect((self.digital_burst_shaper_xx_0, 0), (self.gsm_msg_to_tag_0_0, 0))    
+        self.connect((self.gsm_controlled_rotator_cc_0, 0), (self.low_pass_filter_0_0, 0))    
+        self.connect((self.gsm_controlled_rotator_cc_0_0, 0), (self.uhd_usrp_sink_0, 0))    
+        self.connect((self.gsm_gmsk_mod_0, 0), (self.digital_burst_shaper_xx_0, 0))    
+        self.connect((self.gsm_msg_to_tag_0, 0), (self.gsm_controlled_rotator_cc_0, 0))    
+        self.connect((self.gsm_msg_to_tag_0_0, 0), (self.gsm_controlled_rotator_cc_0_0, 0))    
+        self.connect((self.low_pass_filter_0_0, 0), (self.gsm_receiver_0, 0))    
+        self.connect((self.uhd_usrp_source_0, 0), (self.gsm_msg_to_tag_0, 0))    
+
+    def get_delay_correction(self):
+        return self.delay_correction
+
+    def set_delay_correction(self, delay_correction):
+        self.delay_correction = delay_correction
+        self.gsm_txtime_setter_0.set_delay_correction(self.delay_correction+self.uplink_shift)
+
+    def get_osr(self):
+        return self.osr
+
+    def set_osr(self, osr):
+        self.osr = osr
+        self.gsm_gmsk_mod_0.set_sps(self.osr)
+
+    def get_ppm(self):
+        return self.ppm
+
+    def set_ppm(self, ppm):
+        self.ppm = ppm
+        self.gsm_controlled_rotator_cc_0.set_phase_inc(self.ppm/1.0e6*2*math.pi*self.rx_freq/self.samp_rate)
+        self.gsm_controlled_rotator_cc_0_0.set_phase_inc(-self.ppm/1.0e6*2*math.pi*self.tx_freq/self.samp_rate)
+
+    def get_rx_freq(self):
+        return self.rx_freq
+
+    def set_rx_freq(self, rx_freq):
+        self.rx_freq = rx_freq
+        self.gsm_controlled_rotator_cc_0.set_phase_inc(self.ppm/1.0e6*2*math.pi*self.rx_freq/self.samp_rate)
+        self.uhd_usrp_source_0.set_center_freq(self.rx_freq, 0)
+
+    def get_rx_gain(self):
+        return self.rx_gain
+
+    def set_rx_gain(self, rx_gain):
+        self.rx_gain = rx_gain
+        self.uhd_usrp_source_0.set_gain(self.rx_gain, 0)
+        	
+
+    def get_samp_rate(self):
+        return self.samp_rate
+
+    def set_samp_rate(self, samp_rate):
+        self.samp_rate = samp_rate
+        self.gsm_controlled_rotator_cc_0.set_phase_inc(self.ppm/1.0e6*2*math.pi*self.rx_freq/self.samp_rate)
+        self.gsm_controlled_rotator_cc_0_0.set_phase_inc(-self.ppm/1.0e6*2*math.pi*self.tx_freq/self.samp_rate)
+        self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.samp_rate, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
+        self.uhd_usrp_sink_0.set_samp_rate(self.samp_rate)
+        self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)
+
+    def get_timing_advance(self):
+        return self.timing_advance
+
+    def set_timing_advance(self, timing_advance):
+        self.timing_advance = timing_advance
+        self.gsm_txtime_setter_0.set_timing_advance(self.timing_advance)
+
+    def get_trx_base_port(self):
+        return self.trx_base_port
+
+    def set_trx_base_port(self, trx_base_port):
+        self.trx_base_port = trx_base_port
+
+    def get_trx_remote_addr(self):
+        return self.trx_remote_addr
+
+    def set_trx_remote_addr(self, trx_remote_addr):
+        self.trx_remote_addr = trx_remote_addr
+
+    def get_tx_freq(self):
+        return self.tx_freq
+
+    def set_tx_freq(self, tx_freq):
+        self.tx_freq = tx_freq
+        self.gsm_controlled_rotator_cc_0_0.set_phase_inc(-self.ppm/1.0e6*2*math.pi*self.tx_freq/self.samp_rate)
+        self.uhd_usrp_sink_0.set_center_freq(self.tx_freq, 0)
+
+    def get_tx_gain(self):
+        return self.tx_gain
+
+    def set_tx_gain(self, tx_gain):
+        self.tx_gain = tx_gain
+        self.uhd_usrp_sink_0.set_gain(self.tx_gain, 0)
+        	
+
+    def get_uplink_shift(self):
+        return self.uplink_shift
+
+    def set_uplink_shift(self, uplink_shift):
+        self.uplink_shift = uplink_shift
+        self.gsm_txtime_setter_0.set_delay_correction(self.delay_correction+self.uplink_shift)
+
+
+def argument_parser():
+    parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
+    parser.add_option(
+        "", "--delay-correction", dest="delay_correction", type="eng_float", default=eng_notation.num_to_str(285.616e-6),
+        help="Set delay_correction [default=%default]")
+    parser.add_option(
+        "", "--osr", dest="osr", type="intx", default=4,
+        help="Set OSR [default=%default]")
+    parser.add_option(
+        "", "--ppm", dest="ppm", type="eng_float", default=eng_notation.num_to_str(-1),
+        help="Set Clock offset correction [default=%default]")
+    parser.add_option(
+        "-d", "--rx-freq", dest="rx_freq", type="eng_float", default=eng_notation.num_to_str(938600000),
+        help="Set rx_freq [default=%default]")
+    parser.add_option(
+        "-g", "--rx-gain", dest="rx_gain", type="eng_float", default=eng_notation.num_to_str(40),
+        help="Set rx_gain [default=%default]")
+    parser.add_option(
+        "", "--samp-rate", dest="samp_rate", type="eng_float", default=eng_notation.num_to_str(13e6/12.0),
+        help="Set samp_rate [default=%default]")
+    parser.add_option(
+        "", "--timing-advance", dest="timing_advance", type="eng_float", default=eng_notation.num_to_str(0),
+        help="Set timing_advance [default=%default]")
+    parser.add_option(
+        "", "--trx-base-port", dest="trx_base_port", type="string", default="5700",
+        help="Set 5700 [default=%default]")
+    parser.add_option(
+        "", "--trx-remote-addr", dest="trx_remote_addr", type="string", default="127.0.0.1",
+        help="Set 127.0.0.1 [default=%default]")
+    parser.add_option(
+        "-u", "--tx-freq", dest="tx_freq", type="eng_float", default=eng_notation.num_to_str(938900000),
+        help="Set tx_freq [default=%default]")
+    parser.add_option(
+        "-r", "--tx-gain", dest="tx_gain", type="eng_float", default=eng_notation.num_to_str(30),
+        help="Set tx_gain [default=%default]")
+    parser.add_option(
+        "", "--uplink-shift", dest="uplink_shift", type="eng_float", default=eng_notation.num_to_str(-(6.0/1625000*(156.25)*3)),
+        help="Set uplink_shift [default=%default]")
+    return parser
+
+
+def main(top_block_cls=radio_if_grc, options=None):
+    if options is None:
+        options, _ = argument_parser().parse_args()
+
+    tb = top_block_cls(delay_correction=options.delay_correction, osr=options.osr, ppm=options.ppm, rx_freq=options.rx_freq, rx_gain=options.rx_gain, samp_rate=options.samp_rate, timing_advance=options.timing_advance, trx_base_port=options.trx_base_port, trx_remote_addr=options.trx_remote_addr, tx_freq=options.tx_freq, tx_gain=options.tx_gain, uplink_shift=options.uplink_shift)
+    tb.start()
+    tb.wait()
+
+
+if __name__ == '__main__':
+    main()