diff --git a/src/energenie/radio2_test.py b/src/energenie/radio2_test.py
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+# radio2_test.py  15/04/2016  D.J.Whale
+#
+# A simple Energenie radio exerciser
+#
+# Repeatedly transmits OOK packets to turn switch 1 on and off.
+#
+
+import radio2 as radio
+import time
+
+# How many times to repeat the OOK payload.
+# NOTE: At the moment this is limited to 16*8<256 in the HRF module
+# but that restriction will soon be removed.
+
+
+REPEATS = 8
+
+
+# The 'radio' module knows nothing about the Energenie (HS1527) bit encoding,
+# so this test code manually encodes the bits.
+# For the full Python stack, there is an encoder module that can generate
+# specific payloads. Repeats are done in radio_transmitter.
+# The HRF preamble feature is no longer used, it's more predictable to
+# put the preamble in the payload.
+
+
+# preamble pulse with timing violation gap
+PREAMBLE = [0x80, 0x00, 0x00, 0x00]
+
+# Energenie 'random' 20 bit address is 0x6C6C6
+# 0110 1100 0110 1100 0110
+# 0 encoded as 8 (1000)
+# 1 encoded as E (1110)
+ADDR     = [0x8E, 0xE8, 0xEE, 0x88, 0x8E, 0xE8, 0xEE, 0x88, 0x8E, 0xE8]
+
+# Energenie 'switch 1 ON' command  F 1111  (0xEE, 0xEE)
+SW1_ON  = [0xEE, 0xEE]
+
+# Energenie 'switch 1 OFF' command E 1110  (0xEE, 0xE8)
+SW1_OFF = [0xEE, 0xE8]
+
+# manual preamble, 20 bit encoded address, 4 encoded data bits
+enc_1on  = PREAMBLE + ADDR + SW1_ON
+enc_1off = PREAMBLE + ADDR + SW1_OFF
+
+
+def radio_test_ook():
+    """Repeatedly test switch 1 ON then OFF"""
+
+    radio.init()
+
+    try:
+        radio.modulation(ook=True)
+        while True:
+            print("Switch 1 ON")
+            radio.send_payload(enc_1on, REPEATS)
+            radio.standby()
+            time.sleep(1)
+
+            print("Switch 1 OFF")
+            radio.send_payload(enc_1off, REPEATS)
+            radio.standby()
+            time.sleep(1)
+    finally:
+        radio.finished()
+
+
+if __name__ == "__main__":
+    radio_test_ook()
+
+# END
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