diff --git a/README.md b/README.md
index 274afb7..0b60bc9 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,45 @@
-# rdz_ttgo_sonde
\ No newline at end of file
+RDZ_TTGO_SONDE
+==============
+
+This a simple, experimental, not (well) tested, and incomplete decoder for
+radiosonde RS41 and DFM06/09 on a TTGO LoRa ESP32 with OLED display board.
+
+## Button commands
+You can use the button on the board (not the reset button, the second one) to
+issue some commands. The software distinguishes between several inputs:
+
+SHORT	Short button press (<1.5 seconds)
+DOUBLE  Short button press, followed by another button press within 0.5 seconds
+MID	Medium-length button press (2-4 seconds)
+LONG	Long button press (>5 seconds)
+
+## Wireless configuration
+
+On startup, as well as after a LONG button press, the WiFI configuration will
+be started.  The board will scan available WiFi networks, if the scan results
+contains a WiFi network configured with ID and Password in networks.txt, it
+will connect to that network in station mode. If no known network is found, or
+the connection does not suceed after 5 seconds, it instead starts in access point
+mode. In both cases, the ESP32's IP address will be shown in tiny letters in the
+bottom line. Then the board will switch to scanning mode.
+
+## Scanning mode
+
+In the scanning mode, the board will iterate over all channels configured in
+channels.txt, trying to decode a radio sonde on each channel for about 1 second
+for RS41, a bit less for DMF06/09. If a valid signal is found, the board switches
+to receiving mode on that channel.  a SHORT buttong press will also switch to
+receiving mode.
+
+## Receiving mode
+
+In receiving mode, a single frequency will be decoded, and sonde info (ID, GPS
+coordinates, RSSI) will be displayed. The bar above the IP address indicates,
+for the last 18 frames, if reception was successfull (|) or failed (.) 
+A DOUBLE press will switch to scanning mode.
+A SHORT press will switch to the next channel in channels.txt
+
+# Spectrum mode
+
+A medium press will active scan the whole band (400..406 MHz) and display a
+spectrum diagram (each line == 50 kHz)
diff --git a/RX_FSK/RX_FSK.ino b/RX_FSK/RX_FSK.ino
index 46b0674..ec03589 100644
--- a/RX_FSK/RX_FSK.ino
+++ b/RX_FSK/RX_FSK.ino
@@ -101,6 +101,37 @@ void setupWifiList() {
   for(int j=0; j<i; j++) { Serial.print(networks[j].id); Serial.print(": "); Serial.println(networks[j].pw); }
 }
 
+void setupChannelList() {
+  File file = SPIFFS.open("/qrg.txt", "r");
+  if(!file) {
+    Serial.println("There was an error opening the file '/qrg.txt' for reading");
+    return;
+  }
+  int i=0;
+  sonde.clearSonde();
+  while(file.available()) {
+    String line = file.readStringUntil('\n');
+    if(!file.available()) break;
+    if(line[0] == '#') continue;
+    char *space = strchr(line.c_str(), ' ');
+    if(!space) continue;
+    *space = 0;
+    float freq = atof(line.c_str());
+    SondeType type;
+    if(space[1]=='4') { type=STYPE_RS41; }
+    else if (space[1]=='9') { type=STYPE_DFM09; }
+    else if (space[1]=='6') { type=STYPE_DFM06; }
+    else continue;
+    Serial.printf("Adding %f with type %d\b",freq,type);
+    sonde.addSonde(freq, type);
+    i++;
+  }
+  nNetworks = i;
+  Serial.print(i); Serial.println(" networks in networks.txt\n");
+  for(int j=0; j<i; j++) { Serial.print(networks[j].id); Serial.print(": "); Serial.println(networks[j].pw); }
+
+}
+
 const char *fetchWifiPw(const char *id) {
   for(int i=0; i<nNetworks; i++) {
     Serial.print("Comparing '");
@@ -206,10 +237,13 @@ void setup()
   // Handle button press
   attachInterrupt(0, buttonISR, CHANGE);
 
+  setupChannelList();
+ #if 0
   sonde.clearSonde();
   sonde.addSonde(402.300, STYPE_RS41);
   sonde.addSonde(402.700, STYPE_RS41);
   sonde.addSonde(403.450, STYPE_DFM09);
+ #endif
   /// not here, done by sonde.setup(): rs41.setup();
   sonde.setup();
 }
@@ -267,7 +301,7 @@ void loopScanner() {
       enterMode(ST_DECODER);
       return;
   }
-  if(++tries>=SCAN_MAXTRIES) {
+  if(++tries>=SCAN_MAXTRIES && !hasKeyPress()) {
     sonde.nextConfig();
     tries = 0;
   }
@@ -334,7 +368,7 @@ void loopWifiScan() {
     pw=fetchWifiPw(id);
     if(pw) break;
   }
-  if(!pw) { id="test"; pw="test"; }
+  if(1||!pw) { id="test"; pw="test"; }
   Serial.print("Connecting to: "); Serial.println(id);
   u8x8.drawString(0,6, "Conn:");
   u8x8.drawString(6,6, id);
@@ -344,6 +378,24 @@ void loopWifiScan() {
         Serial.print(".");
         u8x8.drawString(15,7,_scan[cnt&1]);
         cnt++;
+        if(cnt==4) {
+            WiFi.disconnect();  // retry, for my buggy FritzBox
+            WiFi.begin(id, pw);
+        }
+        if(cnt==10) {
+            WiFi.disconnect();
+            delay(1000);
+            WiFi.softAP("sonde","sondesonde");
+            IPAddress myIP = WiFi.softAPIP();
+            Serial.print("AP IP address: ");
+            Serial.println(myIP);
+            sonde.setIP(myIP.toString().c_str());
+            sonde.updateDisplayIP();
+            SetupAsyncServer();
+            delay(5000);
+            enterMode(ST_DECODER);
+            return;
+        }
   }
 
   Serial.println("");
@@ -354,7 +406,7 @@ void loopWifiScan() {
   sonde.updateDisplayIP();
   SetupAsyncServer();
   delay(5000);
-  mainState=ST_SPECTRUM;
+  enterMode(ST_DECODER);
 }
 
 
diff --git a/RX_FSK/data/qrg.txt b/RX_FSK/data/qrg.txt
new file mode 100644
index 0000000..6bb6ae2
--- /dev/null
+++ b/RX_FSK/data/qrg.txt
@@ -0,0 +1,8 @@
+# Frequency in Mhz (format nnn.nnn)
+# Type (4=RS41, 6=DFM normal, DFM-06, 9=DFM inverted, DFM-09)
+#
+402.700 4
+402.300 4
+403.450 9
+405.100 4
+# end
diff --git a/libraries/SondeLib/DFM.cpp b/libraries/SondeLib/DFM.cpp
index 69113a7..1d8828f 100644
--- a/libraries/SondeLib/DFM.cpp
+++ b/libraries/SondeLib/DFM.cpp
@@ -2,6 +2,7 @@
 /* DFM decoder functions */
 #include "DFM.h"
 #include "SX1278FSK.h"
+#include "Sonde.h"
 
 #define DFM_DEBUG 1
 
@@ -167,6 +168,8 @@ int DFM::decodeCFG(uint8_t *cfg)
 	if((cfg[0]>>4)==0x06 && type==0) {   // DFM-6 ID
 		lowid = ((cfg[0]&0x0F)<<20) | (cfg[1]<<12) | (cfg[2]<<4) | (cfg[3]&0x0f);
 		Serial.print("DFM-06 ID: "); Serial.print(lowid, HEX);
+		snprintf(sonde.si()->id, 10, "%x", lowid);
+		sonde.si()->validID = true;
 	}
 	if((cfg[0]>>4)==0x0A) {  // DMF-9 ID
 		type=9;
@@ -180,6 +183,8 @@ int DFM::decodeCFG(uint8_t *cfg)
 		if(idgood==3) {
 			uint32_t dfmid = (highid<<16) | lowid;
 			Serial.print("DFM-09 ID: "); Serial.print(dfmid); 
+			snprintf(sonde.si()->id, 10, "%d", dfmid);
+			sonde.si()->validID = true;
 		}
 	}
 }
@@ -204,6 +209,9 @@ int DFM::decodeDAT(uint8_t *dat)
 		vh = (dat[4]<<8) + dat[5];
 		Serial.print("GPS-lat: "); Serial.print(lat*0.0000001);
 		Serial.print(", hor-V: "); Serial.print(vh*0.01);
+		sonde.si()->lat = lat*0.0000001;
+		sonde.si()->hs = vh*0.01;
+		sonde.si()->validPos |= 0x11; 
 		}
 		break;
 	case 3:
@@ -213,6 +221,9 @@ int DFM::decodeDAT(uint8_t *dat)
 		dir = ((uint16_t)dat[4]<<8) + dat[5];
 		Serial.print("GPS-lon: "); Serial.print(lon*0.0000001);
 		Serial.print(", dir: "); Serial.print(dir*0.01);
+		sonde.si()->lon = lon*0.0000001;
+		sonde.si()->dir = dir*0.01;
+		sonde.si()->validPos |= 0x42;
 		}
 		break;
 	case 4:
@@ -222,6 +233,9 @@ int DFM::decodeDAT(uint8_t *dat)
 		vv = (int16_t)( (dat[4]<<8) | dat[5] );
 		Serial.print("GPS-height: "); Serial.print(hei*0.01);
 		Serial.print(", vv: "); Serial.print(vv*0.01);
+		sonde.si()->hei = hei*0.01;
+		sonde.si()->vs = vv*0.01;
+		sonde.si()->validPos |= 0x0C;
 		}
 		break;
 	case 8:
@@ -258,7 +272,7 @@ int DFM::receiveFrame() {
 
 	sx1278.writeRegister(REG_OP_MODE, FSK_RX_MODE);
 	int e = sx1278.receivePacketTimeout(1000, data);
-	if(e) { return 1; } //if timeout... return 1
+	if(e) { return RX_TIMEOUT; } //if timeout... return 1
 
 	deinterleave(data, 7, hamming_conf);
 	deinterleave(data+7, 13, hamming_dat1);
@@ -279,6 +293,7 @@ int DFM::receiveFrame() {
 	decodeCFG(byte_conf);
 	decodeDAT(byte_dat1);
 	decodeDAT(byte_dat2);
+	return RX_OK;
 }
 
 DFM dfm = DFM();
diff --git a/libraries/SondeLib/Sonde.cpp b/libraries/SondeLib/Sonde.cpp
index 22b5e52..86ff2a4 100644
--- a/libraries/SondeLib/Sonde.cpp
+++ b/libraries/SondeLib/Sonde.cpp
@@ -36,6 +36,10 @@ static const uint8_t font[10][5]={
   0x36, 0x49, 0x49, 0x49, 0x36,   // 8
   0x06, 0x49, 0x39, 0x29, 0x1E }; // 9;  .=0x40
 
+static uint8_t halfdb_tile[8]={0x80, 0x27, 0x45, 0x45, 0x45, 0x39, 0x00, 0x00};
+static uint8_t empty_tile[8]={0x80, 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00, 0x00};
+
+
 void Sonde::setIP(const char *ip) {
   int tp = 0;
   int len = strlen(ip);
@@ -152,8 +156,11 @@ void Sonde::updateDisplayID() {
 void Sonde::updateDisplayRSSI() {
 	char buf[16];
 	u8x8.setFont(u8x8_font_7x14_1x2_r);
-	snprintf(buf, 16, "%ddB ", sonde.si()->rssi);
+	snprintf(buf, 16, "-%d   ", sonde.si()->rssi/2);
+	int len=strlen(buf)-3;
+	buf[5]=0;
 	u8x8.drawString(0,6,buf);
+	u8x8.drawTile(len,6,1,(sonde.si()->rssi&1)?halfdb_tile:empty_tile);
 }
 
 void Sonde::updateStat() {
diff --git a/libraries/SondeLib/Sonde.h b/libraries/SondeLib/Sonde.h
index de3e80a..27936cd 100644
--- a/libraries/SondeLib/Sonde.h
+++ b/libraries/SondeLib/Sonde.h
@@ -23,7 +23,8 @@ typedef struct st_sondeinfo {
         float hei;
         float vs;
         float hs;
-        bool validPos;
+	float dir; // 0..360
+        uint8_t validPos;   // bit pattern for validity of above 6 fields
         // RSSI from receiver
         int rssi;
 	uint8_t rxStat[20];