diff --git a/simulations/airshower_beacon_simulation/lib/rit.py b/simulations/airshower_beacon_simulation/lib/rit.py
index db2704c..cf6a4f6 100644
--- a/simulations/airshower_beacon_simulation/lib/rit.py
+++ b/simulations/airshower_beacon_simulation/lib/rit.py
@@ -58,6 +58,8 @@ def pow_and_time(test_loc,ev,dt=1.0):
         a_sum = np.add(a_sum,a_int)
     if len(a_sum) != 0:
         P = np.sum(np.square(np.absolute(np.fft.fft(a_sum))))
+        # normalise P with the length of the traces
+        P = P/( t_sum[-1] - t_sum[0])
     else:
         print("ERROR, a_sum lenght = 0",
               "tmin ",t_min,