diff --git a/libraries/SondeLib/RS41.cpp b/libraries/SondeLib/RS41.cpp
index 39c6628..4752b37 100644
--- a/libraries/SondeLib/RS41.cpp
+++ b/libraries/SondeLib/RS41.cpp
@@ -357,10 +357,11 @@ static void posrs41(const byte b[], uint32_t b_len, uint32_t p)
 
 
 
-
-void RS41::decode41(byte *data, int maxlen)
+// returns: 0: ok, -1: rs or crc error
+int RS41::decode41(byte *data, int maxlen)
 {
-	char buf[128];
+	char buf[128];	
+	int crcok = 0;
 
 	int32_t corr = reedsolomon41(data, 560, 131);  // try short frame first
 	if(corr<0) {
@@ -393,7 +394,8 @@ void RS41::decode41(byte *data, int maxlen)
 		// check CRC
 		if(!crcrs(data, 560, p, p+len)) {
 			Serial.println("###CRC ERROR###");
-		} else {
+		} else {	
+		crcok = 1;
 		switch(typ) {
 		case 'y': // name
 			{
@@ -421,6 +423,7 @@ void RS41::decode41(byte *data, int maxlen)
 		p += len;
 		Serial.println();
 	}
+	return crcok ? 0 : -1;
 }
 void RS41::printRaw(uint8_t *data, int len)
 {
@@ -473,8 +476,8 @@ int RS41::receiveFrame() {
 	//printRaw(data, MAXLEN);
 	for(int i=0; i<RS41MAXLEN; i++) { data[i] = data[i] ^ scramble[i&0x3F]; }
 	//printRaw(data, MAXLEN);
-	decode41(data, RS41MAXLEN);
-	return RX_OK;
+	int res = decode41(data, RS41MAXLEN);
+	return res==0 ? RX_OK : RX_ERROR;
 }
 
 RS41 rs41 = RS41();
diff --git a/libraries/SondeLib/RS41.h b/libraries/SondeLib/RS41.h
index f817233..b7b1aca 100644
--- a/libraries/SondeLib/RS41.h
+++ b/libraries/SondeLib/RS41.h
@@ -23,7 +23,7 @@ private:
 	uint32_t bits2val(const uint8_t *bits, int len);
 	void printRaw(uint8_t *data, int len);
 	int bitsToBytes(uint8_t *bits, uint8_t *bytes, int len);
-	void decode41(byte *data, int maxlen);
+	int decode41(byte *data, int maxlen);
 
 #define B 8
 #define S 4
diff --git a/libraries/SondeLib/Scanner.cpp b/libraries/SondeLib/Scanner.cpp
index fba1ed9..9e91869 100644
--- a/libraries/SondeLib/Scanner.cpp
+++ b/libraries/SondeLib/Scanner.cpp
@@ -6,7 +6,7 @@ extern U8X8_SSD1306_128X64_NONAME_SW_I2C *u8x8;
 
 #define CHANBW 10
 #define PIXSAMPL (50/CHANBW)
-#define SMOOTH 4
+#define SMOOTH 3
 #define STARTF 400000000
 #define NCHAN ((int)(6000/CHANBW))
 
@@ -16,7 +16,7 @@ int scandisp[NCHAN/PIXSAMPL];
 #define PLOT_N 120
 #define TICK1 (120/6)
 #define TICK2 (TICK1/4)
-#define PLOT_MIN -220
+#define PLOT_MIN -250
 #define PLOT_SCALE(x) (x<PLOT_MIN?0:(x-PLOT_MIN)/2)
 
 const byte tilepatterns[9]={0,0x80,0xC0,0xE0,0xF0,0xF8,0xFC,0xFE,0xFF};
@@ -82,7 +82,7 @@ void Scanner::scan()
 		lastfrf = frf;
 		// Wait TS_HOP (20us) + TS_RSSI ( 2^(SMOOTH+1) / 4 / CHANBW us)
 		int wait = 20 + 1000*(1<<(SMOOTH+1))/4/CHANBW;
-		delayMicroseconds(wait);
+		delayMicroseconds(wait+5);
 		int rssi = -(int)sx1278.readRegister(REG_RSSI_VALUE_FSK);
 		if(iter==0) { scanresult[i] = rssi; } else {
 			if(rssi>scanresult[i]) scanresult[i]=rssi;
diff --git a/libraries/SondeLib/Sonde.cpp b/libraries/SondeLib/Sonde.cpp
index a866f58..26ae18a 100644
--- a/libraries/SondeLib/Sonde.cpp
+++ b/libraries/SondeLib/Sonde.cpp
@@ -17,10 +17,10 @@ static unsigned char ms_tiles[] U8X8_PROGMEM = {
    0x1F, 0x02, 0x04, 0x02, 0x1F, 0x40, 0x20, 0x10, 0x08, 0x04, 0x12, 0xA4, 0xA4, 0xA4, 0x40, 0x00
    };
 static unsigned char stattiles[4][4] =  {
-   0x00, 0x00, 0x00, 0x00 ,
-   0x00, 0x10, 0x10, 0x00 ,
-   0x1F, 0x15, 0x15, 0x00 ,
-   0x00, 0x1F, 0x00, 0x00  };
+   0x00, 0x1F, 0x00, 0x00 ,   // | == ok
+   0x00, 0x10, 0x10, 0x00 ,   // . == no header found
+   0x1F, 0x15, 0x15, 0x00 ,   // E == decode error
+   0x00, 0x00, 0x00, 0x00 };  // ' ' == unknown/unassigned
 
 byte myIP_tiles[8*11];
 
@@ -48,6 +48,11 @@ static uint8_t empty_tile2[8]={0x00, 0x11, 0x02, 0x02, 0x02, 0x01, 0x00, 0x00};
 static uint8_t ap_tile[8]={0x00,0x04,0x22,0x92, 0x92, 0x22, 0x04, 0x00};
 
 Sonde::Sonde() {
+	config.button_pin = 0;
+	config.oled_sda = 4;
+	config.oled_scl = 15;
+	config.oled_rst = 16;
+
 	config.noisefloor = -130;
 	strcpy(config.call,"NOCALL");
 	strcpy(config.passcode, "---");
@@ -83,6 +88,8 @@ void Sonde::setConfig(const char *cfg) {
 		strncpy(config.call, val, 9);
 	} else if(strcmp(cfg,"passcode")==0) {
 		strncpy(config.passcode, val, 9);
+	} else if(strcmp(cfg,"button_pin")==0) {
+		config.button_pin = atoi(val);
 	} else if(strcmp(cfg,"oled_sda")==0) {
 		config.oled_sda = atoi(val);
 	} else if(strcmp(cfg,"oled_scl")==0) {
@@ -147,7 +154,7 @@ void Sonde::addSonde(float frequency, SondeType type, int active)  {
 	sondeList[nSonde].type = type;
 	sondeList[nSonde].freq = frequency;
 	sondeList[nSonde].active = active;
-	memcpy(sondeList[nSonde].rxStat, "\x00\x01\x2\x3\x2\x1\x1\x2\x0\x3\x0\x0\x1\x2\x3\x1\x0", 18);
+	memcpy(sondeList[nSonde].rxStat, "\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3\x3", 18); // unknown/undefined
 	nSonde++;
 }
 void Sonde::nextConfig() {
@@ -196,8 +203,8 @@ int Sonde::receiveFrame() {
 		ret = dfm.receiveFrame();
 	}
 	memmove(sonde.si()->rxStat+1, sonde.si()->rxStat, 17);
-	sonde.si()->rxStat[0] = ret==0 ? 3 : 1;    // OK or Timeout; TODO: add error (2)
-	return ret;  // 0: OK, 1: Timeuot, 2: Other error (TODO)
+	sonde.si()->rxStat[0] = ret;
+	return ret;  // 0: OK, 1: Timeuot, 2: Other error, 3: unknown
 }
 
 void Sonde::updateDisplayPos() {
diff --git a/libraries/SondeLib/Sonde.h b/libraries/SondeLib/Sonde.h
index df1eca3..9c39c4c 100644
--- a/libraries/SondeLib/Sonde.h
+++ b/libraries/SondeLib/Sonde.h
@@ -7,12 +7,13 @@
 // RX_TIMEOUT: no header detected
 // RX_ERROR: header detected, but data not decoded (crc error, etc.)
 // RX_OK: header and data ok
-enum RxResult { RX_OK, RX_TIMEOUT, RX_ERROR };
+enum RxResult { RX_OK, RX_TIMEOUT, RX_ERROR, RX_UNKNOWN };
 
 enum SondeType { STYPE_DFM06, STYPE_DFM09, STYPE_RS41 };
 extern const char *sondeTypeStr[5];
 
 typedef struct st_rdzconfig {
+	int button_pin;
 	int oled_sda;
 	int oled_scl;
 	int oled_rst;