diff --git a/crossbow.ino b/crossbow.ino
index e727a38..244478f 100644
--- a/crossbow.ino
+++ b/crossbow.ino
@@ -131,8 +131,9 @@ void setup(void)
     }
 
     LoRa.setSignalBandwidth(500E3);
-    LoRa.setSpreadingFactor(7);
-    LoRa.setCodingRate4(5);
+    LoRa.setSpreadingFactor(8);
+    LoRa.setCodingRate4(6);
+    LoRa.enableCrc();
 
     /*
      * Use interrupt driven approach only on RX side
@@ -314,6 +315,7 @@ void loop(void)
 
         if (frameToSend == QSP_FRAME_RC_DATA && !ppmReader.isReceiving()) {
             frameToSend = -1;
+            //FIXME uncomment to enable full Failsafe
         }
 
         if (frameToSend > -1) {
diff --git a/variables.h b/variables.h
index 8840dca..ceacb2c 100644
--- a/variables.h
+++ b/variables.h
@@ -11,7 +11,7 @@
 #define RX_TASK_HEALTH 200 //5Hz should be enough
 #define RSSI_CHANNEL 11
 
-#define TX_TRANSMIT_SLOT_RATE 50 //ms
+#define TX_TRANSMIT_SLOT_RATE 70 //ms
 #define RX_FAILSAFE_DELAY (TX_TRANSMIT_SLOT_RATE * 8)
 #define TX_FAILSAFE_DELAY (RX_FAILSAFE_DELAY * 4)