diff --git a/lms6/lms6.c b/lms6/lms6.c
new file mode 100644
index 0000000..e7757cb
--- /dev/null
+++ b/lms6/lms6.c
@@ -0,0 +1,653 @@
+
+/*
+   LMS6
+   (403 MHz)
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+
+typedef unsigned char  ui8_t;
+typedef unsigned short ui16_t;
+typedef unsigned int   ui32_t;
+
+
+int option_verbose = 0,  // ausfuehrliche Anzeige
+    option_raw = 0,      // rohe Frames
+    option_inv = 0,      // invertiert Signal
+    option_res = 0,      // genauere Bitmessung
+    wavloaded = 0;
+
+
+/* -------------------------------------------------------------------------- */
+
+#define BAUD_RATE   4800
+
+int sample_rate = 0, bits_sample = 0, channels = 0;
+float samples_per_bit = 0;
+
+int findstr(char *buf, char *str, int pos) {
+    int i;
+    for (i = 0; i < 4; i++) {
+        if (buf[(pos+i)%4] != str[i]) break;
+    }
+    return i;
+}
+
+int read_wav_header(FILE *fp) {
+    char txt[4+1] = "\0\0\0\0";
+    unsigned char dat[4];
+    int byte, p=0;
+
+    if (fread(txt, 1, 4, fp) < 4) return -1;
+    if (strncmp(txt, "RIFF", 4)) return -1;
+    if (fread(txt, 1, 4, fp) < 4) return -1;
+    // pos_WAVE = 8L
+    if (fread(txt, 1, 4, fp) < 4) return -1;
+    if (strncmp(txt, "WAVE", 4)) return -1;
+    // pos_fmt = 12L
+    for ( ; ; ) {
+        if ( (byte=fgetc(fp)) == EOF ) return -1;
+        txt[p % 4] = byte;
+        p++; if (p==4) p=0;
+        if (findstr(txt, "fmt ", p) == 4) break;
+    }
+    if (fread(dat, 1, 4, fp) < 4) return -1;
+    if (fread(dat, 1, 2, fp) < 2) return -1;
+
+    if (fread(dat, 1, 2, fp) < 2) return -1;
+    channels = dat[0] + (dat[1] << 8);
+
+    if (fread(dat, 1, 4, fp) < 4) return -1;
+    memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24);
+
+    if (fread(dat, 1, 4, fp) < 4) return -1;
+    if (fread(dat, 1, 2, fp) < 2) return -1;
+    //byte = dat[0] + (dat[1] << 8);
+
+    if (fread(dat, 1, 2, fp) < 2) return -1;
+    bits_sample = dat[0] + (dat[1] << 8);
+
+    // pos_dat = 36L + info
+    for ( ; ; ) {
+        if ( (byte=fgetc(fp)) == EOF ) return -1;
+        txt[p % 4] = byte;
+        p++; if (p==4) p=0;
+        if (findstr(txt, "data", p) == 4) break;
+    }
+    if (fread(dat, 1, 4, fp) < 4) return -1;
+
+
+    fprintf(stderr, "sample_rate: %d\n", sample_rate);
+    fprintf(stderr, "bits       : %d\n", bits_sample);
+    fprintf(stderr, "channels   : %d\n", channels);
+
+    if ((bits_sample != 8) && (bits_sample != 16)) return -1;
+
+    samples_per_bit = sample_rate/(float)BAUD_RATE;
+
+    fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit);
+
+    return 0;
+}
+
+
+#define EOF_INT  0x1000000
+
+int read_signed_sample(FILE *fp) {  // int = i32_t
+    int byte, i, ret;         //  EOF -> 0x1000000
+
+    for (i = 0; i < channels; i++) {
+                           // i = 0: links bzw. mono
+        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;
+            if (i == 0) ret +=  byte << 8;
+        }
+
+    }
+
+    if (bits_sample ==  8) return ret-128;   // 8bit: 00..FF, centerpoint 0x80=128
+    if (bits_sample == 16) return (short)ret;
+
+    return ret;
+}
+
+int par=1, par_alt=1;
+unsigned long sample_count = 0;
+
+int read_bits_fsk(FILE *fp, int *bit, int *len) {
+    static int sample;
+    int n, y0;
+    float l, x1;
+    static float x0;
+
+    n = 0;
+    do{
+        y0 = sample;
+        sample = read_signed_sample(fp);
+        if (sample == EOF_INT) return EOF;
+        sample_count++;
+        par_alt = par;
+        par =  (sample >= 0) ? 1 : -1;    // 8bit: 0..127,128..255 (-128..-1,0..127)
+        n++;
+    } while (par*par_alt > 0);
+
+    if (!option_res) l = (float)n / samples_per_bit;
+    else {                                 // genauere Bitlaengen-Messung
+        x1 = sample/(float)(sample-y0);    // hilft bei niedriger sample rate
+        l = (n+x0-x1) / samples_per_bit;   // meist mehr frames (nicht immer)
+        x0 = x1;
+    }
+
+    *len = (int)(l+0.5);
+
+    if (!option_inv) *bit = (1+par_alt)/2;  // oben 1, unten -1
+    else             *bit = (1-par_alt)/2;  // sdr#<rev1381?, invers: unten 1, oben -1
+// *bit = (1+inv*par_alt)/2; // ausser inv=0
+
+    return 0;
+}
+
+/* -------------------------------------------------------------------------- */
+
+
+#define BITS 8
+#define HEADLEN (3*16)
+#define HEADOFS  0
+
+// (pp pp 24 54) 00                00                00                  (7A..: SondeID, GPS, ...)
+char header[] = "0011101100100000""0000000000000000""0000000000000000";//"0010010011110001";
+
+
+#define FRAMESTART 0
+
+#define FRAME_LEN       (300)  // 4800baud, 16bits/byte
+#define BITFRAME_LEN    (FRAME_LEN*BITS)
+#define RAWBITFRAME_LEN (BITFRAME_LEN*2)
+
+char buf[HEADLEN];
+int bufpos = -1;
+
+char  frame_rawbits[RAWBITFRAME_LEN+8];
+
+#define K 8
+char polyA[] = "10010101"; // 0xA9
+char polyB[] = "00100010"; // 0x44
+
+char  frame_bits[BITFRAME_LEN+K+4];  // init K-1 bits mit 0
+ui8_t frame_bytes[FRAME_LEN]; // = { 0x7A, ... };
+
+
+void inc_bufpos() {
+  bufpos = (bufpos+1) % HEADLEN;
+}
+
+char cb_inv(char c) {
+    if (c == '0') return '1';
+    if (c == '1') return '0';
+    return c;
+}
+
+int compare2() {
+    int i, j;
+
+    i = 0;
+    j = bufpos;
+    while (i < HEADLEN) {
+        if (j < 0) j = HEADLEN-1;
+        if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break;
+        j--;
+        i++;
+    }
+    if (i == HEADLEN) return 1;
+
+    i = 0;
+    j = bufpos;
+    while (i < HEADLEN) {
+        if (j < 0) j = HEADLEN-1;
+        if (buf[j] != cb_inv(header[HEADOFS+HEADLEN-1-i])) break;
+        j--;
+        i++;
+    }
+    if (i == HEADLEN) return -1;
+
+    return 0;
+
+}
+
+
+int deconv(char* frame_rawbits, char *bits) {
+
+    int j, n, bitA, bitB;
+    char *p;
+    int len;
+    int errors = 0;
+
+        len = strlen(frame_rawbits);
+        for (j = 0; j < K-1; j++) bits[j] = '0';
+        n = 0;
+        while (2*n < len-2*K) {
+            p = frame_rawbits+2*n;
+            bitA = bitB = 0;
+            for (j = 0; j < K-1; j++) {
+                bitA ^= (bits[n+j]&1) & (polyA[j]&1);
+                bitB ^= (bits[n+j]&1) & (polyB[j]&1);
+            }
+            if      ( (bitA^(p[0]&1))==(polyA[K-1]&1)  &&  (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = '1';
+            else if ( (bitA^(p[0]&1))==0               &&  (bitB^(p[1]&1))==0              ) bits[n+K-1] = '0';
+            else { // error: no error correction...
+                if ( (bitA^(p[0]&1))!=(polyA[K-1]&1) && (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = 0x39;
+                else bits[n+K-1] = 0x38;
+                if (n < 256) errors++; // nur bis Ende GPS-vel; alternativ: return pos 1. error 
+            }
+            n += 1;
+        }
+        bits[n+K-1] = '\0';
+
+    return errors;
+}
+
+int bits2bytes(char *bitstr, ui8_t *bytes) {
+    int i, bit, d, byteval;
+    int bitpos, bytepos;
+
+    bitpos = 0;
+    bytepos = 0;
+
+    while (bytepos < FRAME_LEN) {
+
+        byteval = 0;
+        d = 1;
+        for (i = 0; i < BITS; i++) { 
+            bit=*(bitstr+bitpos+i);   /* little endian */
+            //bit=*(bitstr+bitpos+7-i);  /* big endian */
+            if        ((bit == '1') || (bit == '9'))    byteval += d;
+            else /*if ((bit == '0') || (bit == '8'))*/  byteval += 0;
+            d <<= 1;
+        }
+        bitpos += BITS;
+        bytes[bytepos++] = byteval & 0xFF;  
+    }
+
+    //while (bytepos < FRAME_LEN) bytes[bytepos++] = 0;
+
+    return 0;
+}
+
+/* -------------------------------------------------------------------------- */
+
+typedef struct {
+    int frnr;
+    int sn;
+    int week; int gpstow;
+    int jahr; int monat; int tag;
+    int wday;
+    int std; int min; float sek;
+    double lat; double lon; double h;
+    double vH; double vD; double vV;
+    double vE; double vN; double vU;
+    //int freq;
+} gpx_t;
+
+gpx_t gpx;
+
+
+#define pos_SondeSN  0x00  // ?3 byte 7A....
+#define pos_FrameNb  0x03  // 2 byte
+//GPS Position
+#define pos_GPSTOW   0x05  // 4 byte
+#define pos_GPSlat   0x0D  // 4 byte
+#define pos_GPSlon   0x11  // 4 byte
+#define pos_GPSalt   0x15  // 4 byte
+//#define pos_GPSweek   0x20  // 2 byte
+//GPS Velocity East-North-Up (ENU)
+#define pos_GPSvO  0x19  // 3 byte
+#define pos_GPSvN  0x1C  // 3 byte
+#define pos_GPSvV  0x1F  // 3 byte
+
+
+int get_SondeSN() {
+    unsigned byte;
+
+    byte = (frame_bytes[pos_SondeSN]<<16) | (frame_bytes[pos_SondeSN+1]<<8) | frame_bytes[pos_SondeSN+2];
+    gpx.sn = byte;
+
+    return 0;
+}
+
+int get_FrameNb() {
+    int i;
+    unsigned byte;
+    ui8_t frnr_bytes[2];
+    int frnr;
+
+    for (i = 0; i < 2; i++) {
+        byte = frame_bytes[pos_FrameNb + i];
+        frnr_bytes[i] = byte;
+    }
+
+    frnr = (frnr_bytes[0] << 8) + frnr_bytes[1] ;
+    gpx.frnr = frnr;
+
+    return 0;
+}
+
+
+char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
+//char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
+
+int get_GPStime() {
+    int i;
+    unsigned byte;
+    ui8_t gpstime_bytes[4];
+    int gpstime = 0, // 32bit
+        day;
+    float ms;
+
+    for (i = 0; i < 4; i++) {
+        byte = frame_bytes[pos_GPSTOW + i];
+        gpstime_bytes[i] = byte;
+    }
+    gpstime = 0;
+    for (i = 0; i < 4; i++) {
+        gpstime |= gpstime_bytes[i] << (8*(3-i));
+    }
+
+    gpx.gpstow = gpstime;
+
+    ms = gpstime % 1000;
+    gpstime /= 1000;
+
+    day = gpstime / (24 * 3600);
+    gpstime %= (24*3600);
+
+    if ((day < 0) || (day > 6)) return -1;
+    gpx.wday = day;
+    gpx.std = gpstime / 3600;
+    gpx.min = (gpstime % 3600) / 60;
+    gpx.sek = gpstime % 60 + ms/1000.0;
+
+    return 0;
+}
+
+double B60B60 = 0xB60B60;  // 2^32/360 = 0xB60B60.xxx
+
+int get_GPSlat() {
+    int i;
+    unsigned byte;
+    ui8_t gpslat_bytes[4];
+    int gpslat;
+    double lat;
+
+    for (i = 0; i < 4; i++) {
+        byte = frame_bytes[pos_GPSlat + i];
+        if (byte > 0xFF) return -1;
+        gpslat_bytes[i] = byte;
+    }
+
+    gpslat = 0;
+    for (i = 0; i < 4; i++) {
+        gpslat |= gpslat_bytes[i] << (8*(3-i));
+    }
+    lat = gpslat / B60B60;
+    gpx.lat = lat;
+
+    return 0;
+}
+
+int get_GPSlon() {
+    int i;
+    unsigned byte;
+    ui8_t gpslon_bytes[4];
+    int gpslon;
+    double lon;
+
+    for (i = 0; i < 4; i++) {
+        byte = frame_bytes[pos_GPSlon + i];
+        if (byte > 0xFF) return -1;
+        gpslon_bytes[i] = byte;
+    }
+
+    gpslon = 0;
+    for (i = 0; i < 4; i++) {
+        gpslon |= gpslon_bytes[i] << (8*(3-i));
+    }
+    lon = gpslon / B60B60;
+    gpx.lon = lon;
+
+    return 0;
+}
+
+int get_GPSalt() {
+    int i;
+    unsigned byte;
+    ui8_t gpsheight_bytes[4];
+    int gpsheight;
+    double height;
+
+    for (i = 0; i < 4; i++) {
+        byte = frame_bytes[pos_GPSalt + i];
+        if (byte > 0xFF) return -1;
+        gpsheight_bytes[i] = byte;
+    }
+
+    gpsheight = 0;
+    for (i = 0; i < 4; i++) {
+        gpsheight |= gpsheight_bytes[i] << (8*(3-i));
+    }
+    height = gpsheight / 1000.0;
+    gpx.h = height;
+
+    if (height < -100 || height > 60000) return -1;
+    return 0;
+}
+
+int get_GPSvel24() {
+    int i;
+    unsigned byte;
+    ui8_t gpsVel_bytes[3];
+    int vel24;
+    double vx, vy, vz, dir; //, alpha;
+
+    for (i = 0; i < 3; i++) {
+        byte = frame_bytes[pos_GPSvO + i];
+        if (byte > 0xFF) return -1;
+        gpsVel_bytes[i] = byte;
+    }
+    vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
+    if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
+    vx = vel24 / 1e3; // ost
+
+    for (i = 0; i < 3; i++) {
+        byte = frame_bytes[pos_GPSvN + i];
+        if (byte > 0xFF) return -1;
+        gpsVel_bytes[i] = byte;
+    }
+    vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
+    if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
+    vy= vel24 / 1e3; // nord
+
+    for (i = 0; i < 3; i++) {
+        byte = frame_bytes[pos_GPSvV + i];
+        if (byte > 0xFF) return -1;
+        gpsVel_bytes[i] = byte;
+    }
+    vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
+    if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
+    vz = vel24 / 1e3; // hoch
+
+    gpx.vE = vx;
+    gpx.vN = vy;
+    gpx.vU = vz;
+
+
+    gpx.vH = sqrt(vx*vx+vy*vy);
+/*
+    alpha = atan2(vy, vx)*180/M_PI;  // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts)
+    dir = 90-alpha;                  // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht
+    if (dir < 0) dir += 360;         // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t)
+    gpx.vD2 = dir;
+*/
+    dir = atan2(vx, vy) * 180 / M_PI;
+    if (dir < 0) dir += 360;
+    gpx.vD = dir;
+
+    gpx.vV = vz;
+
+    return 0;
+}
+
+
+void print_frame(int len) {
+
+    int i, err = 0;
+
+    if (len > RAWBITFRAME_LEN) len = RAWBITFRAME_LEN;
+
+    for (i = len; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = 0;  // oder: '0'
+    err = deconv(frame_rawbits, frame_bits);
+    bits2bytes(frame_bits+K-1, frame_bytes);
+
+
+    if (option_raw) {
+        if (option_raw == 1) {
+            for (i = 0; i < len/(2*BITS); i++) printf("%02x ", frame_bytes[i]); printf("\n");
+        }
+        else {
+            for (i = 0; i < len; i++) printf("%c", frame_rawbits[i]); printf("\n");
+        }
+    }
+    else if (!err  &&  len > 8*2*(pos_GPSTOW+4)) {
+
+        if ((frame_bytes[0] & 0xF0) == 0x70)  // ? beginnen alle SNs mit 0x7A.... bzw 80..... ?
+        {
+            get_FrameNb();
+            get_GPStime();
+            get_SondeSN();
+            if (option_verbose) printf(" (%7d) ", gpx.sn);
+            printf(" [%5d] ", gpx.frnr);
+            printf("%s ", weekday[gpx.wday]);
+            printf("(%02d:%02d:%06.3f) ", gpx.std, gpx.min, gpx.sek); // falls Rundung auf 60s: Ueberlauf
+
+            get_GPSlat();
+            get_GPSlon();
+            err = get_GPSalt();
+            if (!err) {
+                printf(" lat: %.6f° ", gpx.lat);
+                printf(" lon: %.6f° ", gpx.lon);
+                printf(" alt: %.2fm ", gpx.h);
+                //if (option_verbose)
+                {
+                    get_GPSvel24();
+                    //if (option_verbose == 2) printf("  (%.1f ,%.1f,%.1f) ", gpx.vE, gpx.vN, gpx.vU);
+                    printf("  vH: %.1fm/s  D: %.1f°  vV: %.1fm/s ", gpx.vH, gpx.vD, gpx.vV);
+                }
+            }
+
+            printf("\n");
+        }
+    }
+
+}
+
+
+int main(int argc, char **argv) {
+
+    FILE *fp;
+    char *fpname;
+    int i, bit, len, rbit, rbit0;
+    int pos;
+    //int header_found = 0;
+
+
+    fpname = argv[0];
+    ++argv;
+    while ((*argv) && (!wavloaded)) {
+        if      ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
+            fprintf(stderr, "%s [options] audio.wav\n", fpname);
+            fprintf(stderr, "  options:\n");
+            fprintf(stderr, "       -v, --verbose\n");
+            fprintf(stderr, "       -r, --raw\n");
+            return 0;
+        }
+        else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
+            option_verbose = 1;
+        }
+        //else if ( (strcmp(*argv, "-vv") == 0) ) option_verbose = 2;
+        else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
+            option_raw = 1;
+        }
+        else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
+            option_raw = 2;
+        }
+        else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
+            option_inv = 1; // unnoetig, NRZ-S...
+        }
+        else if   (strcmp(*argv, "--res") == 0) { option_res = 1; }
+        else {
+            fp = fopen(*argv, "rb");
+            if (fp == NULL) {
+                fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
+                return -1;
+            }
+            wavloaded = 1;
+        }
+        ++argv;
+    }
+    if (!wavloaded) fp = stdin;
+
+    i = read_wav_header(fp);
+    if (i) {
+        fclose(fp);
+        return -1;
+    }
+
+
+    pos = FRAMESTART;
+    rbit0 = 0; //idle
+
+    while (!read_bits_fsk(fp, &rbit, &len)) {
+
+        if (len == 0) { // reset_frame();
+          /*if (pos > 8*2*pos_GPSlon) {
+                //for (i = pos; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = '0';
+                print_frame(pos);
+                //header_found = 0;
+                pos = FRAMESTART;
+            }*/
+            //inc_bufpos();
+            //buf[bufpos] = 'x';
+            continue;   // ...
+        }
+
+        for (i = 0; i < len; i++) {
+
+            inc_bufpos();
+            bit = 0x30 + (rbit==rbit0);  // Ascii, NRZ-S
+            buf[bufpos] = bit;
+            rbit0 = rbit;
+
+            if (pos < RAWBITFRAME_LEN) frame_rawbits[pos] = bit;
+            pos++;
+            if ( compare2() ) {  // GPS: (36+3)
+                print_frame(pos);//FRAME_LEN
+                //header_found = 0;
+                pos = FRAMESTART;
+            }
+        }
+    }
+
+    printf("\n");
+
+    fclose(fp);
+
+    return 0;
+}
+