diff --git a/python/qa_tch_f_chans_demapper.py b/python/qa_tch_f_chans_demapper.py
new file mode 100755
index 0000000..6643653
--- /dev/null
+++ b/python/qa_tch_f_chans_demapper.py
@@ -0,0 +1,154 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2018 by Vasil Velichkov <vvvelichkov@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.
+# 
+# 
+
+import numpy as np
+from gnuradio import gr, gr_unittest, blocks
+import grgsm_swig as grgsm
+import pmt
+
+class qa_tch_f_chans_demapper (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+
+        self.bursts = [
+            "1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "0000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"]
+
+    def tearDown (self):
+        self.tb = None
+
+    def test_fr_demapper (self):
+        """
+            TCH/F Full Rate demapper
+        """
+        frames = [
+                 0,  1,  2,  3,  4,  5,  6,  7,
+                 8,  9, 10, 11, 12, 13, 14, 15,
+                16, 17, 18, 19, 20, 21, 22, 23,
+                24, 25, 26, 27, 28, 29]
+        timeslots = [
+                3, 3, 3, 3, 3, 3, 3, 3,
+                3, 3, 3, 3, 3, 3, 3, 3,
+                3, 3, 3, 3, 3, 3, 3, 3,
+                3, 3, 3, 3, 3, 3
+                ]
+        b = self.bursts
+        bursts = [
+                b[ 0], b[ 1], b[ 2], b[ 3], b[ 4], b[ 5], b[ 6], b[ 7],
+                b[ 8], b[ 9], b[10], b[11], b[12], #12 - sacch
+                b[13], b[14], b[15], b[16], b[17], b[18], b[19], b[20],
+                b[21], b[22], b[23], b[24], b[25], #25 - idle
+                b[26], b[27], b[28], b[29], b[30]
+        ]
+
+        src = grgsm.burst_source(frames, timeslots, bursts)
+        demapper = grgsm.tch_f_chans_demapper(3)
+        tch = grgsm.burst_sink()
+        acch = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "tch_bursts", tch, "in")
+        self.tb.msg_connect(demapper, "acch_bursts", acch, "in")
+
+        self.tb.run ()
+
+        self.assertEqual([
+            b[ 0], b[ 1], b[ 2], b[ 3], b[ 4], b[ 5], b[ 6], b[ 7],
+            b[ 4], b[ 5], b[ 6], b[ 7], b[ 8], b[ 9], b[10], b[11],
+            b[ 8], b[ 9], b[10], b[11],
+            b[13], b[14], b[15], b[16],
+            b[13], b[14], b[15], b[16], b[17], b[18], b[19], b[20],
+            b[17], b[18], b[19], b[20], b[21], b[22], b[23], b[24],
+            b[21], b[22], b[23], b[24],
+            b[26], b[27], b[28], b[29],
+            ], list(tch.get_burst_data()))
+
+        self.assertEqual([], list(acch.get_burst_data()))
+
+    def sacch_fr_test (self, ts, frames, bursts):
+        timeslots = [ts, ts, ts, ts, ts, ts, ts, ts]
+
+        src = grgsm.burst_source(frames, timeslots, bursts)
+        demapper = grgsm.tch_f_chans_demapper(ts)
+        tch = grgsm.burst_sink()
+        acch = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "tch_bursts", tch, "in")
+        self.tb.msg_connect(demapper, "acch_bursts", acch, "in")
+
+        self.tb.run ()
+
+        self.assertEqual([], list(tch.get_burst_data()))
+
+        return list(acch.get_burst_data())
+
+    def test_sacch_tf (self):
+        """
+            SACCH/TF tests
+        """
+        b = self.bursts
+        bursts=[b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]]
+        even = [b[0], b[2], b[4], b[6]]
+        odd =  [b[1], b[3], b[5], b[7]]
+        self.assertEqual(even, self.sacch_fr_test(ts=0, frames=[12, 25, 38, 51, 64, 77, 90, 103], bursts=bursts))
+        self.assertEqual(odd,  self.sacch_fr_test(ts=1, frames=[12, 25, 38, 51, 64, 77, 90, 103], bursts=bursts))
+        self.assertEqual(even, self.sacch_fr_test(ts=2, frames=[38, 51, 64, 77, 90, 103, 116, 129], bursts=bursts))
+        self.assertEqual(odd,  self.sacch_fr_test(ts=3, frames=[38, 51, 64, 77, 90, 103, 116, 129], bursts=bursts))
+        self.assertEqual(even, self.sacch_fr_test(ts=4, frames=[64, 77, 90, 103, 116, 129, 142, 155], bursts=bursts))
+        self.assertEqual(odd,  self.sacch_fr_test(ts=5, frames=[64, 77, 90, 103, 116, 129, 142, 155], bursts=bursts))
+        self.assertEqual(even, self.sacch_fr_test(ts=6, frames=[90, 103, 116, 129, 142, 155, 168, 181], bursts=bursts))
+        self.assertEqual(odd,  self.sacch_fr_test(ts=7, frames=[90, 103, 116, 129, 142, 155, 168, 181], bursts=bursts))
+
+if __name__ == '__main__':
+    gr_unittest.run(qa_tch_f_chans_demapper, "qa_tch_f_chans_demapper.xml")