diff --git a/c34/c34.txt b/c34/c34.txt
index 8544155..4172037 100644
--- a/c34/c34.txt
+++ b/c34/c34.txt
@@ -7,7 +7,8 @@ Modulation AFSK 2400 baud
 bits : little endian -> byte
 bytes: big endian -> int-value
 
-bytes getrennt durch 4 bit 1110
+bytes getrennt durch 4 bit 1110:
+8N1: 0 bbbbbbbb 1(11)0 bb... , (11)-idle
 
 Datenpaket besteht aus 8 byte:
 header  2 byte  00FF
diff --git a/c34/c34dft.c b/c34/c34dft.c
index ea7d44f..11b7473 100644
--- a/c34/c34dft.c
+++ b/c34/c34dft.c
@@ -109,7 +109,7 @@ int read_signed_sample(FILE *fp) {  // int = i32_t
         byte = fgetc(fp);
         if (byte == EOF) return EOF_INT;
         if (i == 0) ret = byte;
-    
+
         if (bits_sample == 16) {
             byte = fgetc(fp);
             if (byte == EOF) return EOF_INT;
@@ -131,7 +131,7 @@ int read_signed_sample(FILE *fp) {  // int = i32_t
 #define N      64 // 128  Vielfaches von 22 oder 10 unten
 #define WLEN   40 // (2*(48000/BAUDRATE))
 
-#define BITS (4+8)  // 1110 bbbbbbbb (oder: 10 bbbbbbbb 11)
+#define BITS (4+8)  // 1110 bbbbbbbb (oder: 0 bbbbbbbb 1 11) (8N1, 11-idle)
 #define LEN_BITFRAME  84  // 7*(4+8)
 #define HEADLEN 28
 
@@ -281,7 +281,7 @@ int bits2bytes(ui8_t bits[], ui8_t bytes[]) {
         /* for (i = 7; i >= 0; i--) { // big endian */
             if     (bits[BITS*j+i] == 1)   byteval += d;
             else /*(bits[BITS*j+i] == 0)*/ byteval += 0;
-            d <<= 1;      
+            d <<= 1;
         }
         bytes[j] = byteval;
     }
@@ -480,7 +480,7 @@ int main(int argc, char *argv[]) {
     ptr = -1; sample_count = -1;
     while ((sample=read_signed_sample(fp)) < EOF_INT) {
 
-        ptr++; 
+        ptr++;
         sample_count++;
         if (ptr == N) ptr = 0;
         buffer[ptr] = sample / (double)(1<<bits_sample);
diff --git a/c34/c50.txt b/c34/c50.txt
new file mode 100644
index 0000000..a3e029d
--- /dev/null
+++ b/c34/c50.txt
@@ -0,0 +1,34 @@
+
+Modulation AFSK 2400 baud
+3000 Hz : bit 1
+4800 Hz : bit 0
+
+
+bits : little endian -> byte
+bytes: big endian -> int-value
+
+8N1: 0 bbbbbbbb 1
+
+Datenpaket besteht aus 8 byte:
+header  2 byte  00FF
+pck_id  1 byte  N
+data    4 byte  val (big endian)
+chksum  2 byte  Fletcher16 (hier: byte2 1's-complement am Ende)
+
+
+Telemetrie pck_id N:
+0x14: date: 0x0003F815 =    260117 -> 2017-01-26
+0x15: time: 0x0001C41D =    124735 -> 11:57:41
+0x16: lat : 0x1BC1678B = 465659787 -> 46+5659787/6000000=46.943298°
+0x17: lon : 0x03D54F9F =  64311199 ->  6+4311199/6000000=6.7185332°
+0x18: alt : 0x0003252E =    206126 -> 206126/10 = 20612.6m
+
+
+GPS-lat/lon wie NMEA mit Faktor 1e5
+
+
+Checksum: Fletcher16
+
+PTU-Data: float32?
+
+