diff --git a/op25/gr-op25_repeater/apps/tdma/tdma_audio.py b/op25/gr-op25_repeater/apps/tdma/tdma_audio.py
new file mode 100755
index 0000000..3968bb9
--- /dev/null
+++ b/op25/gr-op25_repeater/apps/tdma/tdma_audio.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, gru, audio, eng_notation, analog, blocks, filter
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+import numpy as np
+
+import op25_repeater
+import lfsr
+
+class app_top_block(gr.top_block):
+    def __init__(self, options):
+        gr.top_block.__init__(self, "mhp")
+
+        self.lfsr = lfsr.p25p2_lfsr(options.nac, options.sysid, options.wacn)
+        xor_mask = ''
+        for c in self.lfsr.xorsyms:
+            xor_mask += chr(c)
+
+        IN = blocks.file_source(gr.sizeof_char, options.input_file)
+
+        slotid = options.tdma_slotid
+        FRAMER = op25_repeater.p25p2_frame(0, slotid)
+        FRAMER.set_xormask(xor_mask)
+
+        S2F = blocks.short_to_float()
+        M = blocks.multiply_const_ff(1.0 / 32767.0)
+
+        SINK = audio.sink(8000, 'plughw:0,0')
+        
+        self.connect(IN, FRAMER, S2F, M, SINK)
+
+def main():
+    parser = OptionParser(option_class=eng_option)
+    parser.add_option("-v", "--verbose", action="store_true", default=False)
+    parser.add_option("-i", "--input-file", type="string", default=None, help="input file name")
+    parser.add_option("-n", "--nac", type="int", default=0, help="NAC")
+    parser.add_option("-s", "--sysid", type="int", default=0, help="sysid")
+    parser.add_option("-t", "--tdma-slotid", type="int", default=0, help="tdma-slotid (0 or 1)")
+    parser.add_option("-w", "--wacn", type="int", default=0, help="WACN")
+    (options, args) = parser.parse_args()
+    if len(args) != 0:
+        parser.print_help()
+        sys.exit(1)
+
+    assert options.tdma_slotid == 0 or options.tdma_slotid == 1
+ 
+    tb = app_top_block(options)
+    try:
+        tb.run()
+    except KeyboardInterrupt:
+        tb.stop()
+
+if __name__ == "__main__":
+    main()