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diff --git a/m10/m10c_part.c b/m10/m10c_part.c
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+++ b/m10/m10c_part.c
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+
+/*
+ * radiosonde M10 (Trimble GPS)
+ * author: zilog80
+ *
+ * big endian forest
+ */
+
+
+typedef struct {
+    int week; int gpssec;
+    int jahr; int monat; int tag;
+    int wday;
+    int std; int min; int sek;
+    double lat; double lon; double h;
+} datum_t;
+
+datum_t datum;
+
+
+#define BAUD_RATE  4800
+
+
+unsigned char header_bytes[] = { 0x64, 0x9F, 0x20 };
+char header[] = "011001001001111100100000";
+
+#define FRAME_LEN 102
+int framebytes[FRAME_LEN];
+
+
+int bits2bytes(char *bits) {
+// big endian
+// framebytes[pos] = byteval;
+}
+
+
+/* -------------------------------------------------------------------------- */
+
+#define pos_GPSTOW     0x0A  // 4 byte
+#define pos_GPSlat     0x0E  // 4 byte
+#define pos_GPSlon     0x12  // 4 byte
+#define pos_GPSheight  0x16  // 4 byte
+#define pos_GPSweek    0x20  // 2 byte
+
+char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
+
+double B60B60 = 0xB60B60;  // 2^32/360 = 0xB60B60.xxx
+
+void Gps2Date(long GpsWeek, long GpsSeconds, int *Year, int *Month, int *Day) {
+//
+}
+
+int get_GPSweek() {
+//
+    for (i = 0; i < 2; i++) {
+        gpsweek_bytes[i] = framebytes[pos_GPSweek + i];
+    }
+
+    datum.week = (gpsweek_bytes[0] << 8) + gpsweek_bytes[1];
+
+    return 0;
+}
+
+int get_GPStime() {
+//
+    for (i = 0; i < 4; i++) {
+        gpstime_bytes[i] = framebytes[pos_GPSTOW + i];
+    }
+
+    gpstime = 0;
+    for (i = 0; i < 4; i++) {
+        gpstime |= gpstime_bytes[i] << (8*(3-i));
+    }
+
+    //ms = gpstime % 1000;
+    gpstime /= 1000;
+    datum.gpssec = gpstime;
+
+    day = gpstime / (24 * 3600);
+    gpstime %= (24*3600);
+
+    datum.wday = day;
+    datum.std =  gpstime/3600;
+    datum.min = (gpstime%3600)/60;
+    datum.sek =  gpstime%60;
+
+    return 0;
+}
+
+int get_GPSlat() {
+//
+    for (i = 0; i < 4; i++) {
+        gpslat_bytes[i] = framebytes[pos_GPSlat + i];
+    }
+
+    gpslat = 0;
+    for (i = 0; i < 4; i++) {
+        gpslat |= gpslat_bytes[i] << (8*(3-i));
+    }
+    datum.lat = gpslat / B60B60;
+
+    return 0;
+}
+
+int get_GPSlon() {
+//
+    for (i = 0; i < 4; i++) {
+        gpslon_bytes[i] = framebytes[pos_GPSlon + i];
+    }
+
+    gpslon = 0;
+    for (i = 0; i < 4; i++) {
+        gpslon |= gpslon_bytes[i] << (8*(3-i));
+    }
+    datum.lon = gpslon / B60B60;
+
+    return 0;
+}
+
+int get_GPSheight() {
+//
+    for (i = 0; i < 4; i++) {
+        gpsheight_bytes[i] = framebytes[pos_GPSheight + i];
+    }
+
+    gpsheight = 0;
+    for (i = 0; i < 4; i++) {
+        gpsheight |= gpsheight_bytes[i] << (8*(3-i));
+    }
+    datum.h = gpsheight / 1000.0;
+
+    return 0;
+}
+
+/* -------------------------------------------------------------------------- */
+
+int print_pos() {
+    int err;
+
+    err = 0;
+    err |= get_GPSweek();
+    err |= get_GPStime();
+    err |= get_GPSlat();
+    err |= get_GPSlon();
+    err |= get_GPSheight();
+
+    if (!err) {
+
+        Gps2Date(datum.week, datum.gpssec, &datum.jahr, &datum.monat, &datum.tag);
+
+        printf(" (W %d) ", datum.week);
+        printf("%s ", weekday[datum.wday]);
+        printf("%04d-%02d-%02d (%02d:%02d:%02d) ", 
+                datum.jahr, datum.monat, datum.tag, datum.std, datum.min, datum.sek);
+        printf(" lat: %.6f ", datum.lat);
+        printf(" lon: %.6f ", datum.lon);
+        printf(" h: %.2f ", datum.h);
+        printf("\n");
+ 
+    }
+
+    return err;
+}
+
+void print_frame() {
+    int i;
+    ui8_t byte;
+
+    for (i = 0; i < FRAME_LEN; i++) {
+        byte = framebytes[i];
+        fprintf(stdout, "%02x", byte);
+    }
+    fprintf(stdout, "\n");
+
+}
+
+
+int main(int argc, char **argv) {
+
+
+    while ( !read_bits_psk() ) {
+//
+// read_bit_PSK:
+/*
+synch: ...,du,ud,du  oder  ...,ud,du,ud
+bit 0: ud,du  oder  du,ud
+bit 1: du,du  oder  ud,ud  (phase shift)
+Header
+_uuddu udududduududduud udduudududududud duududduudduuddu (oder:)
+_dduud dududuudduduuddu duuddudududududu udduduudduudduud (invers)
+  0 0  0 1 1 0 0 1 0 0  1 0 0 1 1 1 1 1  0 0 1 0 0 0 0 0
+*/
+// header_found
+// bits2byte
+// framebytes
+//
+                    if (option_raw) print_frame();
+                    else print_pos();
+
+    }
+
+
+    return 0;
+}
+