diff --git a/RX_FSK/RX_FSK.ino b/RX_FSK/RX_FSK.ino
index fb44735..8d87fcb 100644
--- a/RX_FSK/RX_FSK.ino
+++ b/RX_FSK/RX_FSK.ino
@@ -1002,7 +1002,7 @@ void initialMode() {
 // 2: access point mode in background. directly start initial mode (spectrum or scanner)
 // 3: traditional sync. WifiScan. Tries to connect to a network, in case of failure activates AP.
 //    Mode 3 shows more debug information on serial port and display.
-static char* _scan[2] = {"/", "\\"};
+static const char* _scan[2] = {"/", "\\"};
 void loopWifiScan() {
   if (sonde.config.wifi == 0) {   // no Wifi
     wifi_state = WIFI_DISABLED;
diff --git a/libraries/SondeLib/RS41.cpp b/libraries/SondeLib/RS41.cpp
index 29909ff..586698a 100644
--- a/libraries/SondeLib/RS41.cpp
+++ b/libraries/SondeLib/RS41.cpp
@@ -74,8 +74,11 @@ int RS41::setup()
 #if RS41_DEBUG
 	Serial.println("Setup sx1278 for RS41 sonde");
 #endif
-	Gencrctab();
-	initrsc();
+	if(!initialized) {
+		Gencrctab();
+		initrsc();
+		initialized = true;
+	}
 
 	if(sx1278.ON()!=0) {
 		RS41_DBG(Serial.println("Setting SX1278 power on FAILED"));
diff --git a/libraries/SondeLib/RS41.h b/libraries/SondeLib/RS41.h
index b7b1aca..41d9f92 100644
--- a/libraries/SondeLib/RS41.h
+++ b/libraries/SondeLib/RS41.h
@@ -42,6 +42,7 @@ private:
               { 1, 1, 1, 0, 0, 0, 0, 1}};
 	uint8_t He[8] = { 0x7, 0xB, 0xD, 0xE, 0x8, 0x4, 0x2, 0x1};  // Spalten von H:
                                                             // 1-bit-error-Syndrome
+	boolean initialized = false;
 
 public:
 	RS41();