diff --git a/sa_core.c b/sa_core.c
index 25be718..3e61097 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -2151,6 +2151,7 @@ void self_test(int test)
     // RBW step time search
     in_selftest = true;
     reset_settings(M_LOW);
+    setting.frequency_IF=433900000;
     ui_mode_normal();
     int i = 15;       // calibrate low mode power on 30 MHz;
     test_prepare(i);
diff --git a/si4432.c b/si4432.c
index 3671265..f58651d 100644
--- a/si4432.c
+++ b/si4432.c
@@ -442,7 +442,7 @@ float SI4432_RSSI(uint32_t i, int s)
     i = setting.repeat;
     RSSI_RAW  = 0;
     while (i-->0)
-      RSSI_RAW += (unsigned int)SI4432_Read_Byte( 0x26 ) << 4 ;
+      RSSI_RAW += ((unsigned int)SI4432_Read_Byte( 0x26 )) << 4 ;
     RSSI_RAW = RSSI_RAW / setting.repeat;
  //   if (MODE_INPUT(setting.mode) && RSSI_RAW == 0)
  //     SI4432_Init();