diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 95cbd91..78cc646 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -36,6 +36,7 @@
     receiver/sch_detector.py
     receiver/fcch_detector.py 
     receiver/chirpz.py
+    misc_utils/arfcn.py
     misc_utils/clock_offset_corrector.py DESTINATION ${GR_PYTHON_DIR}/grgsm
 )
 
@@ -55,3 +56,5 @@
 GR_ADD_TEST(qa_burst_sdcch_subslot_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_burst_sdcch_subslot_filter.py)
 GR_ADD_TEST(qa_burst_fnr_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_burst_fnr_filter.py)
 GR_ADD_TEST(qa_dummy_burst_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_dummy_burst_filter.py)
+GR_ADD_TEST(qa_arfcn ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_arfcn.py)
+
diff --git a/python/__init__.py b/python/__init__.py
index 41adfe8..31c0bc5 100644
--- a/python/__init__.py
+++ b/python/__init__.py
@@ -51,6 +51,7 @@
 from fcch_detector import fcch_detector
 from clock_offset_corrector import clock_offset_corrector
 from gsm_input import gsm_input
+import arfcn
 
 
 #
diff --git a/python/misc_utils/arfcn.py b/python/misc_utils/arfcn.py
new file mode 100644
index 0000000..2397970
--- /dev/null
+++ b/python/misc_utils/arfcn.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author Roman Khassraf <rkhassraf@gmail.com>
+# @section LICENSE
+#
+# Gr-gsm is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# Gr-gsm is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+#
+
+# first uplink freq, first arfcn, last arfcn, downlink frequence distance
+__band_conf = {'GSM450': {'first_freq': 450.6e6, 'first_arfcn': 259, 'last_arfcn': 293, 'downlink_dist': 10e6},
+            'GSM480': {'first_freq': 479e6, 'first_arfcn': 306, 'last_arfcn': 340, 'downlink_dist': 10e6},
+            'GSM850': {'first_freq': 824.2e6, 'first_arfcn': 128, 'last_arfcn': 251, 'downlink_dist': 45e6},
+            'P-GSM': {'first_freq': 890.2e6, 'first_arfcn': 1, 'last_arfcn': 124, 'downlink_dist':  45e6},
+            'E-GSM': {'first_freq': 880.2e6, 'first_arfcn': 975, 'last_arfcn': 1023, 'downlink_dist':  45e6},           
+            'R-GSM': {'first_freq': 876.2e6, 'first_arfcn': 955, 'last_arfcn': 1023, 'downlink_dist':  45e6},
+            'DCS1800': {'first_freq': 1710.2e6, 'first_arfcn': 512, 'last_arfcn': 885, 'downlink_dist':  95e6},
+            'PCS1900': {'first_freq': 1850.2e6, 'first_arfcn': 512, 'last_arfcn': 810, 'downlink_dist':  80e6}}
+
+__chan_spacing = 2e5
+
+
+def get_bands():
+    return __band_conf.keys()
+
+
+def is_valid_arfcn(arfcn, band):
+    """
+    Returns True if arfcn is valid in the given band, else False
+    """
+    if band in __band_conf:
+        conf = __band_conf.get(band)
+        first_arfcn = conf['first_arfcn']
+        last_arfcn = conf['last_arfcn']
+        if first_arfcn <= arfcn <= last_arfcn:
+            return True
+    return False
+
+
+def is_valid_uplink(freq, band):
+    """
+    Returns True if the given frequency is a valid uplink frequency in the given band
+    """
+    if band in __band_conf:
+        conf = __band_conf.get(band)
+        first_freq = arfcn2uplink(conf['first_arfcn'], band)
+        last_freq = arfcn2uplink(conf['last_arfcn'], band)
+    if first_freq is None or last_freq is None:
+        return False
+    if first_freq <= freq <= last_freq:
+        return True
+    return False
+
+
+def is_valid_downlink(freq, band):
+    """
+    Returns True if the given frequency is a valid downlink frequency in the given band
+    """
+    if band in __band_conf:
+        conf = __band_conf.get(band)
+        first_freq = arfcn2downlink(conf['first_arfcn'], band)
+        last_freq = arfcn2downlink(conf['last_arfcn'], band)
+    if first_freq is None or last_freq is None:
+        return False
+    if first_freq <= freq <= last_freq:
+        return True
+    return False 
+
+
+def arfcn2uplink(arfcn, band):
+    if band in __band_conf and is_valid_arfcn(arfcn, band):
+
+        conf = __band_conf.get(band)
+        freq_start = conf['first_freq']
+        offset = conf['first_arfcn']
+        # if (band == 'E-GSM' or band == 'R-GSM') and arfcn > 124:
+        #     offset = 1024
+        f = freq_start + (__chan_spacing * (arfcn - offset))
+        return round(f, 1)
+    return None
+
+
+def arfcn2downlink(arfcn, band):
+    if band in __band_conf and is_valid_arfcn(arfcn, band):
+        conf = __band_conf.get(band)
+        distance = conf['downlink_dist']
+        return round(arfcn2uplink(arfcn, band) + distance, 1)
+    return None
+
+
+def uplink2arfcn(freq, band):
+    if band in __band_conf and is_valid_uplink(freq, band):
+        conf = __band_conf.get(band)
+        freq_start = conf['first_freq']
+        offset = conf['first_arfcn']
+        return int(round(offset + ((freq - freq_start) / __chan_spacing), 0))
+    return None
+
+
+def downlink2arfcn(freq, band):
+    if band in __band_conf and is_valid_downlink(freq, band):
+        conf = __band_conf.get(band)
+        distance = conf['downlink_dist']
+        freq_uplink = freq - distance
+        return int(round(uplink2arfcn(freq_uplink, band), 0))
+    return None
diff --git a/python/qa_arfcn.py b/python/qa_arfcn.py
new file mode 100755
index 0000000..64775ff
--- /dev/null
+++ b/python/qa_arfcn.py
@@ -0,0 +1,268 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author Roman Khassraf <rkhassraf@gmail.com>
+# @section LICENSE
+# 
+# Gr-gsm is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+# 
+# Gr-gsm is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+# 
+
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import os
+import sys
+
+
+class qa_arfcn (gr_unittest.TestCase):
+   
+    def test_001_is_valid_arfcn(self):
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(259, 'GSM450'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(277, 'GSM450'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(293, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(258, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(294, 'GSM450'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(306, 'GSM480'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(323, 'GSM480'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(340, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(305, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(341, 'GSM480'))
+                
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(128, 'GSM850'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(199, 'GSM850'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(251, 'GSM850'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(127, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(251, 'GSM480'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(1, 'P-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(63, 'P-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(124, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(0, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(125, 'P-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(975, 'E-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(999, 'E-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(1023, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(974, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(1024, 'E-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(955, 'R-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(989, 'R-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(1023, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(954, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(1024, 'R-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(512, 'DCS1800'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(732, 'DCS1800'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(885, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(511, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(886, 'DCS1800'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(512, 'PCS1900'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(691, 'PCS1900'))
+        self.assertTrue(grgsm.arfcn.is_valid_arfcn(810, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(511, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_arfcn(811, 'PCS1900'))
+
+
+    def test_002_is_valid_uplink(self):
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(450.6e6, 'GSM450'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(457.4e6, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(450.4e6, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(457.6e6, 'GSM450'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(479e6, 'GSM480'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(485.8e6, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(478.8e6, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(486e6, 'GSM480'))
+                
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(824.2e6, 'GSM850'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(848.8e6, 'GSM850'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(824e6, 'GSM850'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(849e6, 'GSM850'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(890.2e6, 'P-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(914.8e6, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(890e6, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(915e6, 'P-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(880.2e6, 'E-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(889.8e6, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(880e6, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(890e6, 'E-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(876.2e6, 'R-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(889.8e6, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(876e6, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(890e6, 'R-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(1710.2e6, 'DCS1800'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(1784.8e6, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(1710e6, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(1785e6, 'DCS1800'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(1850.2e6, 'PCS1900'))
+        self.assertTrue(grgsm.arfcn.is_valid_uplink(1909.8e6, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(1850e6, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_uplink(1910e6, 'PCS1900'))
+
+
+    def test_003_is_valid_downlink(self):
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(460.6e6, 'GSM450'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(467.4e6, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(460.4e6, 'GSM450'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(467.6e6, 'GSM450'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(489e6, 'GSM480'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(495.8e6, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(488.8e6, 'GSM480'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(496e6, 'GSM480'))
+                
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(869.2e6, 'GSM850'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(893.8e6, 'GSM850'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(869e6, 'GSM850'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(894e6, 'GSM850'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(935.2e6, 'P-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(959.8e6, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(935e6, 'P-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(960e6, 'P-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(925.2e6, 'E-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(934.8e6, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(925e6, 'E-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(935e6, 'E-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(921.2e6, 'R-GSM'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(934.8e6, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(921e6, 'R-GSM'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(935e6, 'R-GSM'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(1805.2e6, 'DCS1800'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(1879.8e6, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(1805e6, 'DCS1800'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(1880e6, 'DCS1800'))
+        
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(1930.2e6, 'PCS1900'))
+        self.assertTrue(grgsm.arfcn.is_valid_downlink(1989.8e6, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(1930e6, 'PCS1900'))
+        self.assertFalse(grgsm.arfcn.is_valid_downlink(1990e6, 'PCS1900'))
+        
+    def test_004_arfcn2uplink(self):
+        self.assertEqual(450.6e6, grgsm.arfcn.arfcn2uplink(259, 'GSM450'))
+        self.assertEqual(457.4e6, grgsm.arfcn.arfcn2uplink(293, 'GSM450'))
+        
+        self.assertEqual(479e6, grgsm.arfcn.arfcn2uplink(306, 'GSM480'))
+        self.assertEqual(485.8e6, grgsm.arfcn.arfcn2uplink(340, 'GSM480'))
+        
+        self.assertEqual(824.2e6, grgsm.arfcn.arfcn2uplink(128, 'GSM850'))
+        self.assertEqual(848.8e6, grgsm.arfcn.arfcn2uplink(251, 'GSM850'))
+        
+        self.assertEqual(890.2e6, grgsm.arfcn.arfcn2uplink(1, 'P-GSM'))
+        self.assertEqual(914.8e6, grgsm.arfcn.arfcn2uplink(124, 'P-GSM'))
+        
+        self.assertEqual(880.2e6, grgsm.arfcn.arfcn2uplink(975, 'E-GSM'))
+        self.assertEqual(889.8e6, grgsm.arfcn.arfcn2uplink(1023, 'E-GSM'))
+        
+        self.assertEqual(876.2e6, grgsm.arfcn.arfcn2uplink(955, 'R-GSM'))
+        self.assertEqual(889.8e6, grgsm.arfcn.arfcn2uplink(1023, 'R-GSM'))
+        
+        self.assertEqual(1710.2e6, grgsm.arfcn.arfcn2uplink(512, 'DCS1800'))
+        self.assertEqual(1784.8e6, grgsm.arfcn.arfcn2uplink(885, 'DCS1800'))
+        
+        self.assertEqual(1850.2e6, grgsm.arfcn.arfcn2uplink(512, 'PCS1900'))
+        self.assertEqual(1909.8e6, grgsm.arfcn.arfcn2uplink(810, 'PCS1900'))
+        
+    def test_005_arfcn2downlink(self):
+        self.assertEqual(460.6e6, grgsm.arfcn.arfcn2downlink(259, 'GSM450'))
+        self.assertEqual(467.4e6, grgsm.arfcn.arfcn2downlink(293, 'GSM450'))
+        
+        self.assertEqual(489e6, grgsm.arfcn.arfcn2downlink(306, 'GSM480'))
+        self.assertEqual(495.8e6, grgsm.arfcn.arfcn2downlink(340, 'GSM480'))
+        
+        self.assertEqual(869.2e6, grgsm.arfcn.arfcn2downlink(128, 'GSM850'))
+        self.assertEqual(893.8e6, grgsm.arfcn.arfcn2downlink(251, 'GSM850'))
+        
+        self.assertEqual(935.2e6, grgsm.arfcn.arfcn2downlink(1, 'P-GSM'))
+        self.assertEqual(959.8e6, grgsm.arfcn.arfcn2downlink(124, 'P-GSM'))
+        
+        self.assertEqual(925.2e6, grgsm.arfcn.arfcn2downlink(975, 'E-GSM'))
+        self.assertEqual(934.8e6, grgsm.arfcn.arfcn2downlink(1023, 'E-GSM'))
+        
+        self.assertEqual(921.2e6, grgsm.arfcn.arfcn2downlink(955, 'R-GSM'))
+        self.assertEqual(934.8e6, grgsm.arfcn.arfcn2downlink(1023, 'R-GSM'))
+        
+        self.assertEqual(1805.2e6, grgsm.arfcn.arfcn2downlink(512, 'DCS1800'))
+        self.assertEqual(1879.8e6, grgsm.arfcn.arfcn2downlink(885, 'DCS1800'))
+        
+        self.assertEqual(1930.2e6, grgsm.arfcn.arfcn2downlink(512, 'PCS1900'))
+        self.assertEqual(1989.8e6, grgsm.arfcn.arfcn2downlink(810, 'PCS1900'))
+        
+    def test_006_uplink2arfcn(self):
+        self.assertEqual(259, grgsm.arfcn.uplink2arfcn(450.6e6, 'GSM450'))
+        self.assertEqual(293, grgsm.arfcn.uplink2arfcn(457.4e6, 'GSM450'))
+        
+        self.assertEqual(306, grgsm.arfcn.uplink2arfcn(479e6, 'GSM480'))
+        self.assertEqual(340, grgsm.arfcn.uplink2arfcn(485.8e6, 'GSM480'))
+        
+        self.assertEqual(128, grgsm.arfcn.uplink2arfcn(824.2e6, 'GSM850'))
+        self.assertEqual(251, grgsm.arfcn.uplink2arfcn(848.8e6, 'GSM850'))
+        
+        self.assertEqual(1, grgsm.arfcn.uplink2arfcn(890.2e6, 'P-GSM'))
+        self.assertEqual(124, grgsm.arfcn.uplink2arfcn(914.8e6, 'P-GSM'))
+        
+        self.assertEqual(975, grgsm.arfcn.uplink2arfcn(880.2e6, 'E-GSM'))
+        self.assertEqual(1023, grgsm.arfcn.uplink2arfcn(889.8e6, 'E-GSM'))
+        
+        self.assertEqual(955, grgsm.arfcn.uplink2arfcn(876.2e6, 'R-GSM'))
+        self.assertEqual(1023, grgsm.arfcn.uplink2arfcn(889.8e6, 'R-GSM'))
+        
+        self.assertEqual(512, grgsm.arfcn.uplink2arfcn(1710.2e6, 'DCS1800'))
+        self.assertEqual(885, grgsm.arfcn.uplink2arfcn(1784.8e6, 'DCS1800'))
+        
+        self.assertEqual(512, grgsm.arfcn.uplink2arfcn(1850.2e6, 'PCS1900'))
+        self.assertEqual(810, grgsm.arfcn.uplink2arfcn(1909.8e6, 'PCS1900'))
+        
+    def test_007_downlink2arfcn(self):
+        self.assertEqual(259, grgsm.arfcn.downlink2arfcn(460.6e6, 'GSM450'))
+        self.assertEqual(293, grgsm.arfcn.downlink2arfcn(467.4e6, 'GSM450'))
+        
+        self.assertEqual(306, grgsm.arfcn.downlink2arfcn(489e6, 'GSM480'))
+        self.assertEqual(340, grgsm.arfcn.downlink2arfcn(495.8e6, 'GSM480'))
+        
+        self.assertEqual(128, grgsm.arfcn.downlink2arfcn(869.2e6, 'GSM850'))
+        self.assertEqual(251, grgsm.arfcn.downlink2arfcn(893.8e6, 'GSM850'))
+        
+        self.assertEqual(1, grgsm.arfcn.downlink2arfcn(935.2e6, 'P-GSM'))
+        self.assertEqual(124, grgsm.arfcn.downlink2arfcn(959.8e6, 'P-GSM'))
+        
+        self.assertEqual(975, grgsm.arfcn.downlink2arfcn(925.2e6, 'E-GSM'))
+        self.assertEqual(1023, grgsm.arfcn.downlink2arfcn(934.8e6, 'E-GSM'))
+        
+        self.assertEqual(955, grgsm.arfcn.downlink2arfcn(921.2e6, 'R-GSM'))
+        self.assertEqual(1023, grgsm.arfcn.downlink2arfcn(934.8e6, 'R-GSM'))
+        
+        self.assertEqual(512, grgsm.arfcn.downlink2arfcn(1805.2e6, 'DCS1800'))
+        self.assertEqual(885, grgsm.arfcn.downlink2arfcn(1879.8e6, 'DCS1800'))
+        
+        self.assertEqual(512, grgsm.arfcn.downlink2arfcn(1930.2e6, 'PCS1900'))
+        self.assertEqual(810, grgsm.arfcn.downlink2arfcn(1989.8e6, 'PCS1900'))
+        
+        
+if __name__ == '__main__':
+    gr_unittest.run(qa_arfcn, "qa_arfcn.xml")
+