diff --git a/apps/grgsm_trx b/apps/grgsm_trx
index b53d12a..efb9c24 100755
--- a/apps/grgsm_trx
+++ b/apps/grgsm_trx
@@ -52,7 +52,7 @@ class Application:
 		self.phy_tx_gain = argv.tx_gain
 		self.phy_rx_antenna = argv.rx_antenna
 		self.phy_tx_antenna = argv.tx_antenna
-		self.phy_freq_offset_hz = argv.freq_offset
+		self.phy_freq_offset = argv.freq_offset
 		self.phy_ppm = argv.ppm
 
 		# Set up signal handlers
@@ -63,7 +63,7 @@ class Application:
 		self.radio = radio_if(self.phy_args, self.phy_sample_rate,
 			self.phy_rx_gain, self.phy_tx_gain, self.phy_ppm,
 			self.phy_rx_antenna, self.phy_tx_antenna,
-			self.phy_freq_offset_hz, self.bind_addr,
+			self.phy_freq_offset, self.bind_addr,
 			self.remote_addr, self.base_port)
 
 		# Power measurement emulation
diff --git a/python/trx/radio_if.py b/python/trx/radio_if.py
index a9b0358..85970a9 100644
--- a/python/trx/radio_if.py
+++ b/python/trx/radio_if.py
@@ -85,7 +85,7 @@ class radio_if(gr.top_block):
 	def __init__(self, phy_args, phy_sample_rate,
 			phy_rx_gain, phy_tx_gain, phy_ppm,
 			phy_rx_antenna, phy_tx_antenna,
-			phy_freq_offset_hz, trx_bind_addr,
+			phy_freq_offset, trx_bind_addr,
 			trx_remote_addr, trx_base_port):
 
 		print("[i] Init Radio interface (L:%s:%u <-> R:%s:%u)"
@@ -97,7 +97,7 @@ class radio_if(gr.top_block):
 		self.rx_gain = phy_rx_gain
 		self.tx_gain = phy_tx_gain
 		self.ppm = phy_ppm
-		self.freq_offset_hz = phy_freq_offset_hz
+		self.freq_offset = phy_freq_offset
 
 		gr.top_block.__init__(self, "GR-GSM TRX")
 
@@ -279,19 +279,19 @@ class radio_if(gr.top_block):
 		return self.ppm / 1.0e6 * 2 * pi * fc / self.sample_rate
 
 	def set_rx_freq(self, fc):
-		fc += self.freq_offset_hz
+		fc += self.freq_offset
 		print("[#] Shifting RX freq. to %s (offset is %s)"
 			% (eng_notation.num_to_str(fc),
-				eng_notation.num_to_str(self.freq_offset_hz)))
+				eng_notation.num_to_str(self.freq_offset)))
 		self.phy_src.set_center_freq(fc, 0)
 		self.rotator_src.set_phase_inc(self.calc_phase_inc(fc))
 		self.rx_freq = fc
 
 	def set_tx_freq(self, fc):
-		fc += self.freq_offset_hz
+		fc += self.freq_offset
 		print("[#] Shifting TX freq. to %s (offset is %s)"
 			% (eng_notation.num_to_str(fc),
-				eng_notation.num_to_str(self.freq_offset_hz)))
+				eng_notation.num_to_str(self.freq_offset)))
 		self.phy_sink.set_center_freq(fc, 0)
 		self.rotator_sink.set_phase_inc(-self.calc_phase_inc(fc))
 		self.tx_freq = fc