diff --git a/RX_FSK/data/screens.txt b/RX_FSK/data/screens.txt
index d00d93b..84a12cf 100644
--- a/RX_FSK/data/screens.txt
+++ b/RX_FSK/data/screens.txt
@@ -38,7 +38,9 @@
 # C afC value
 # N ip address (only tiny font)
 # S launch site
-# Mx telemetry value x (t temp p preassure h hyg)
+# K RS41 kill timer values: Kl launch timer, Kb burst timer, Kc kill countdown
+#   format: K_4: h:mm k_6: h:mm:ss k_s: sssss,  nothing shown for other sonde
+# Mx telemetry value x (t temp p preassure h hyg) [not yet implemented, maybe some day in future]
 # Gx  GPS-related data
 #     raw data from GPS:  GA, GO, GH, GC: LAtitude, lOngitude, Altutide(Height), Course over ground
 #     relative to sonde:  GD, GI, GB: Distance, dIrection (absolute), relative Bearing
diff --git a/libraries/SondeLib/Display.cpp b/libraries/SondeLib/Display.cpp
index 0485796..d80f0e2 100644
--- a/libraries/SondeLib/Display.cpp
+++ b/libraries/SondeLib/Display.cpp
@@ -1064,6 +1064,40 @@ void Display::drawSite(DispEntry *de) {
 void Display::drawTelemetry(DispEntry *de) {
 }
 
+void Display::drawKilltimer(DispEntry *de) {
+	rdis->setFont(de->fmt);
+	uint16_t value;
+	switch(de->extra[0]) {
+	case 'l': value = sonde.si()->launchKT; break;
+	case 'b': value = sonde.si()->burstKT; break;
+	case 'c':
+		value = sonde.si()->countKT;
+		if(value!=0xffff) {
+			value += ((uint16_t)sonde.si()->frame)-sonde.si()->crefKT;
+		}
+		break;
+	}
+	// format: 4=h:mm; 6=h:mm:ss; s=sssss
+	uint16_t h=value/3600;
+	uint16_t m=(value-h*3600)/60;
+	uint16_t s=value%60;
+	switch(de->extra[1]) {
+	case '4':
+		if(value!=0xffff) snprintf(buf, 5, "%d:%02d", h, m);
+		else strcpy(buf, "    ");
+		break;
+	case '6':
+		if(value!=0xffff) snprintf(buf, 7, "%d:%02d:%02d", h, m, s);
+		else strcpy(buf, "       ");
+		break;
+	default:
+		if(value!=0xffff) snprintf(buf, 6, "%5d", value);
+		else strcpy(buf, "     ");
+		break;
+	}
+	strcat(buf, de->extra[2]);
+	drawString(de, buf);
+}
 #define EARTH_RADIUS (6371000.0F)
 #ifndef PI
 #define  PI  (3.1415926535897932384626433832795)
diff --git a/libraries/SondeLib/RS41.cpp b/libraries/SondeLib/RS41.cpp
index a6e3cff..76ddc57 100644
--- a/libraries/SondeLib/RS41.cpp
+++ b/libraries/SondeLib/RS41.cpp
@@ -438,6 +438,25 @@ int RS41::decode41(byte *data, int maxlen)
 			strncpy(sonde.si()->ser, (const char *)(data+p+2), 8);
 			sonde.si()->ser[8]=0;
 			sonde.si()->validID=true;
+			int calnr = data[p+23];
+			// not sure about this
+			if(calnr==0x31) {
+				uint16_t bt = data[p+30] + 256*data[p+31];
+				sonde.si()->burstKT = bt;
+			}
+			// this should be right...
+			if(calnr==0x02) {
+				uint16_t kt = data[p+31] + 256*data[p+32];
+				sonde.si()->launchKT = kt;
+			}
+			// and this seems fine as well...
+			if(calnr==0x32) {
+				uint16_t cntdown = data[p+24] + (data[p+25]<<8);
+				uint16_t min = cntdown - (cntdown/3600)*3600;
+				Serial.printf("Countdown value: %d\n [%2d:%02d:%02d]", cntdown, cntdown/3600, min/60, min-(min/60)*60);
+				sonde.si()->countKT = cntdown;
+				sonde.si()->crefKT = fnr;
+			}
 			}
 			// TODO: some more data
 			break;
diff --git a/libraries/SondeLib/Sonde.h b/libraries/SondeLib/Sonde.h
index 432bceb..a600920 100644
--- a/libraries/SondeLib/Sonde.h
+++ b/libraries/SondeLib/Sonde.h
@@ -83,8 +83,11 @@ typedef struct st_sondeinfo {
 	uint32_t norxStart;		// millis() timestamp of continuous no rx start
 	uint32_t viewStart;		// millis() timestamp of viewinf this sonde with current display
 	int8_t lastState;		// -1: disabled; 0: norx; 1: rx
+	// shut down timers, currently only for RS41; -1=disabled
+	int16_t launchKT, burstKT, countKT;
+	uint16_t crefKT; // frame number in which countKT was last sent
 } SondeInfo;
-// rxStat: 3=undef[empty] 1=timeout[.] 2=errro[E] 3=ok[1] 5=no valid position[°]
+// rxStat: 3=undef[empty] 1=timeout[.] 2=errro[E] 0=ok[|] 4=no valid position[°]
 
 // Used for interacting with the RX background task
 typedef struct st_RXTask {