diff --git a/openair1/PHY/impl_defs_top.h b/openair1/PHY/impl_defs_top.h
index f8b871c545..90645e2c11 100644
--- a/openair1/PHY/impl_defs_top.h
+++ b/openair1/PHY/impl_defs_top.h
@@ -243,11 +243,13 @@
 //#define CHBCH_RSSI_MIN -75
 
 #ifdef BIT8_TX
-#define AMP 128
+#define AMP_SHIFT 7
 #else
-#define AMP 512//1024 //4096
+#define AMP_SHIFT 9
 #endif
 
+#define AMP ((1)<<AMP_SHIFT)
+
 #define AMP_OVER_SQRT2 ((AMP*ONE_OVER_SQRT2_Q15)>>15)
 #define AMP_OVER_2 (AMP>>1)