diff --git a/weathex/weathex_20230512_401100kHz.c b/weathex/weathex_20230512_401100kHz.c
new file mode 100644
index 0000000..6866605
--- /dev/null
+++ b/weathex/weathex_20230512_401100kHz.c
@@ -0,0 +1,511 @@
+
+/*
+    Malaysia
+    2023-05-12 ([ 4400]  12:20:37  alt: 12616.6  lat: 2.6785  lon: 101.5827)
+    401100 kHz  (64kHz wide)
+    Weathex w/o PN9 ?
+*/
+
+#include <stdio.h>
+#include <string.h>
+
+
+typedef unsigned char ui8_t;
+typedef short i16_t;
+typedef unsigned int ui32_t;
+
+
+int option_verbose = 0,
+    option_raw = 0,
+    option_inv = 0,
+    option_b = 0,
+    option_timestamp = 0,
+    wavloaded = 0;
+int wav_channel = 0;     // audio channel: left
+
+
+#define BAUD_RATE  4800.0 // (4997.2) // 5000
+
+#define FRAMELEN    69 //64 //200 //(66)
+#define BITFRAMELEN (8*FRAMELEN)
+/*
+#define HEADLEN 56 //64
+#define HEADOFS 0
+char header[] = "10101010""10101010""10101010"//"10101010"  // preamble
+                "11000001""10010100""11000001""11000110";
+*/
+//preamble_header_sn1: 101010101010101010101010 1100000110010100110000011100011001111000 110001010110110111100100
+//preamble_header_sn2: 101010101010101010101010 1100000110010100110000011100011001111000 001100100110110111100100
+//preamble_header_sn3: 101010101010101010101010 1100000110010100110000011100011001111000 001010000110110111100100
+
+#define HEADLEN 48 //64
+#define HEADOFS 0
+char header[] = //"10101010""10101010""10101010"//"10101010"  // preamble
+                //"00101101""11010100""10101010";//"000100";
+                "10101010""10101010""10101010"
+                "00101101""11010100""10101010"; //00010010010101000011011110001001
+
+char buf[HEADLEN+1] = "xxxxxxxxxx\0";
+int bufpos = 0;
+
+char frame_bits[BITFRAMELEN+1];
+ui8_t frame_bytes[FRAMELEN+1];
+ui8_t xframe[FRAMELEN+1];
+
+int sample_rate = 0, bits_sample = 0, channels = 0;
+float samples_per_bit = 0;
+
+int findstr(char *buff, char *str, int pos) {
+    int i;
+    for (i = 0; i < 4; i++) {
+        if (buff[(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
+
+unsigned long sample_count = 0;
+double bitgrenze = 0;
+
+int read_signed_sample(FILE *fp) {  // int = i32_t
+    int byte, i, sample=0, s=0;     // EOF -> 0x1000000
+
+    for (i = 0; i < channels; i++) {
+                           // i = 0: links bzw. mono
+        byte = fgetc(fp);
+        if (byte == EOF) return EOF_INT;
+        if (i == wav_channel) sample = byte;
+
+        if (bits_sample == 16) {
+            byte = fgetc(fp);
+            if (byte == EOF) return EOF_INT;
+            if (i == wav_channel) sample +=  byte << 8;
+        }
+
+    }
+
+    if (bits_sample ==  8)  s = sample-128;   // 8bit: 00..FF, centerpoint 0x80=128
+    if (bits_sample == 16)  s = (short)sample;
+
+    sample_count++;
+
+    return s;
+}
+
+int par=1, par_alt=1;
+
+int read_bits_fsk(FILE *fp, int *bit, int *len) {
+    static int sample;
+    int n;
+    float l;
+
+    n = 0;
+    do{
+        sample = read_signed_sample(fp);
+        if (sample == EOF_INT) return EOF;
+        //sample_count++; // in read_signed_sample()
+        par_alt = par;
+        par =  (sample >= 0) ? 1 : -1;    // 8bit: 0..127,128..255 (-128..-1,0..127)
+        n++;
+    } while (par*par_alt > 0);
+
+    l = (float)n / samples_per_bit;
+
+    *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
+
+    /* Y-offset ? */
+
+    return 0;
+}
+
+int bitstart = 0;
+unsigned long scount = 0;
+int read_rawbit(FILE *fp, int *bit) {
+    int sample;
+    int sum;
+
+    sum = 0;
+
+    if (bitstart) {
+        scount = 0;    // eigentlich scount = 1
+        bitgrenze = 0; //   oder bitgrenze = -1
+        bitstart = 0;
+    }
+    bitgrenze += samples_per_bit;
+
+    do {
+        sample = read_signed_sample(fp);
+        if (sample == EOF_INT) return EOF;
+        //sample_count++; // in read_signed_sample()
+        //par =  (sample >= 0) ? 1 : -1;    // 8bit: 0..127,128..255 (-128..-1,0..127)
+        sum += sample;
+        scount++;
+    } while (scount < bitgrenze);  // n < samples_per_bit
+
+    if (sum >= 0) *bit = 1;
+    else          *bit = 0;
+
+    if (option_inv) *bit ^= 1;
+
+    return 0;
+}
+
+int compare() {
+    int i=0;
+    while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == header[HEADLEN+HEADOFS-1-i])) {
+        i++;
+    }
+    return i;
+}
+
+char inv(char c) {
+    if (c == '0') return '1';
+    if (c == '1') return '0';
+    return c;
+}
+
+int compare2() {
+    int i=0;
+    while ((i < HEADLEN) && (buf[(bufpos+i) % HEADLEN] == inv(header[HEADLEN+HEADOFS-1-i]))) {
+        i++;
+    }
+    return i;
+}
+
+int bits2bytes(char *bitstr, ui8_t *bytes) {
+    int i, bit, d, byteval;
+    int bitpos, bytepos;
+
+    bitpos = 0;
+    bytepos = 0;
+
+    while (bytepos < FRAMELEN) {
+
+        byteval = 0;
+        d = 1;
+        for (i = 0; i < 8; i++) {
+            //bit = bitstr[bitpos+i]; /* little endian */
+            bit = bitstr[bitpos+7-i];  /* big endian */
+            if         (bit == '1')     byteval += d;
+            else /*if ((bit == '0') */  byteval += 0;
+            d <<= 1;
+        }
+        bitpos += 8;
+        bytes[bytepos++] = byteval;
+
+    }
+
+    //while (bytepos < FRAME_LEN) bytes[bytepos++] = 0;
+
+    return 0;
+}
+
+
+// PN9 Data Whitening
+// cf. https://www.ti.com/lit/an/swra322/swra322.pdf
+//     https://destevez.net/2019/07/lucky-7-decoded/
+//
+// counter low byte: frame[OFS+6] XOR 0xCC
+// zero bytes, frame[OFS+32]: 0C CA C9 FB 49 37 E5 A8
+//
+ui8_t  PN9b[64] = { 0xFF, 0x87, 0xB8, 0x59, 0xB7, 0xA1, 0xCC, 0x24,
+                    0x57, 0x5E, 0x4B, 0x9C, 0x0E, 0xE9, 0xEA, 0x50,
+                    0x2A, 0xBE, 0xB4, 0x1B, 0xB6, 0xB0, 0x5D, 0xF1,
+                    0xE6, 0x9A, 0xE3, 0x45, 0xFD, 0x2c, 0x53, 0x18,
+                    0x0C, 0xCA, 0xC9, 0xFB, 0x49, 0x37, 0xE5, 0xA8,
+                    0x51, 0x3B, 0x2F, 0x61, 0xAA, 0x72, 0x18, 0x84,
+                    0x02, 0x23, 0x23, 0xAB, 0x63, 0x89, 0x51, 0xB3,
+                    0xE7, 0x8B, 0x72, 0x90, 0x4C, 0xE8, 0xFb, 0xC1};
+
+
+ui32_t xor8sum(ui8_t bytes[], int len) {
+    int j;
+    ui8_t xor8 = 0;
+    ui8_t sum8 = 0;
+
+    for (j = 0; j < len; j++) {
+        xor8 ^= bytes[j];
+        sum8 += bytes[j];
+    }
+    //sum8 &= 0xFF;
+
+    return  (xor8 << 8) | sum8;
+}
+
+
+#define OFS 4
+
+int print_frame() {
+    int j;
+    int chkdat, chkval, chk_ok;
+
+    bits2bytes(frame_bits, frame_bytes);
+
+    for (j = 0; j < FRAMELEN; j++) {
+        ui8_t b = frame_bytes[j];
+        //if (j >= 6) b ^= PN9b[(j-6)%64];
+        xframe[j] = b;
+    }
+
+    chkval = xor8sum(xframe+OFS+2, 53);
+    chkdat = (xframe[OFS+55]<<8) | xframe[OFS+55+1];
+    chk_ok = (chkdat == chkval);
+
+    if (option_raw) {
+        if (option_raw == 1) {
+            for (j = 0; j < FRAMELEN; j++) {
+                //printf("%02X ", frame_bytes[j]);
+                printf("%02X ", xframe[j]);
+            }
+            printf(" #  %s", chk_ok ? "[OK]" : "[NO]");
+            if (option_verbose) printf(" # [%04X:%04X]", chkdat, chkval);
+        }
+        else {
+            for (j = 0; j < BITFRAMELEN; j++) {
+                printf("%c", frame_bits[j]);
+                //if (j % 8 == 7) printf(" ");
+            }
+        }
+        printf("\n");
+    }
+    else {
+
+        ui32_t sn;
+        ui32_t cnt;
+        int val;
+
+        // SN ?
+        sn = xframe[OFS+2] | (xframe[OFS+3]<<8) | ((xframe[OFS+4])<<16) | ((xframe[OFS+5])<<24);
+        printf(" (0x%08X) ", sn);
+
+        // counter ?
+        cnt = xframe[OFS+6] | (xframe[OFS+7]<<8);
+        printf(" [%5d] ", cnt);
+
+        ui8_t frid = xframe[OFS+8];
+
+        if (frid == 2)
+        {
+            // time/UTC
+            int hms;
+            hms = xframe[OFS+9] | (xframe[OFS+10]<<8) | ((xframe[OFS+11])<<16);
+            hms &= 0x3FFFF;
+            //printf(" (%6d) ", hms);
+            ui8_t h =  hms / 10000;
+            ui8_t m = (hms % 10000) / 100;
+            ui8_t s =  hms % 100;
+            printf(" %02d:%02d:%02d ", h, m, s);  // UTC
+
+            // alt
+            val = xframe[OFS+15] | (xframe[OFS+16]<<8) | ((xframe[OFS+17])<<16);
+            val &= 0x7FFFFF; // int23 ?
+            val >>= 4;
+            //if (val & 0x3FFFFF) val -= 0x400000;
+            float alt = val / 10.0f;
+            printf(" alt: %.1f ", alt);  // MSL
+
+            // lat
+            val = xframe[OFS+17] | (xframe[OFS+18]<<8) | ((xframe[OFS+19])<<16) | ((xframe[OFS+20])<<24);
+            val >>= 7;
+            val &= 0x3FFFFFF; // int26 ?
+            if (val & 0x2000000) val -= 0x4000000; // sign ?
+            float lat = val / 1e5f;
+            printf(" lat: %.4f ", lat);
+
+            // lon
+            val = xframe[OFS+21] | (xframe[OFS+22]<<8) | ((xframe[OFS+23])<<16)| ((xframe[OFS+24])<<24);
+            val &= 0x3FFFFFF; // int26 ?
+            if (val & 0x2000000) val -= 0x4000000; // sign ?
+            float lon = val / 1e5f;
+            printf(" lon: %.4f ", lon);
+
+        }
+
+        // checksum
+        printf("  %s", chk_ok ? "[OK]" : "[NO]");
+        if (option_verbose) printf(" # [%04X:%04X]", chkdat, chkval);
+
+        printf("\n");
+    }
+
+    return 0;
+}
+
+int main(int argc, char **argv) {
+
+    FILE *fp;
+    char *fpname;
+
+    int i, j, h, bit, len;
+    int bit_count, frames;
+    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, "       -i\n");
+            fprintf(stderr, "       -b\n");
+            return 0;
+        }
+        else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
+            option_inv = 1;
+        }
+        else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
+            option_verbose = 1;
+        }
+        else if   (strcmp(*argv, "-b" ) == 0) { option_b = 1; }
+        else if   (strcmp(*argv, "-t" ) == 0) { option_timestamp = 1; }
+        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 {
+            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) return -1;
+
+
+    bit_count = 0;
+    frames = 0;
+    while (!read_bits_fsk(fp, &bit, &len)) {
+
+        if (len == 0) {
+            bufpos--;
+            if (bufpos < 0) bufpos = HEADLEN-1;
+            buf[bufpos] = 'x';
+            continue;
+        }
+
+
+        for (j = 0; j < len; j++) {
+            bufpos--;
+            if (bufpos < 0) bufpos = HEADLEN-1;
+            buf[bufpos] = 0x30 + bit;
+
+            if (!header_found)
+            {
+                h = compare(); //h2 = compare2();
+                if ((h >= HEADLEN)) {
+                    header_found = 1;
+                    fflush(stdout);
+                    if (option_timestamp) printf("<%8.3f> ", sample_count/(double)sample_rate);
+                    strncpy(frame_bits, header, HEADLEN);
+                    bit_count += HEADLEN;
+                    frames++;
+                }
+            }
+            else
+            {
+                frame_bits[bit_count] = 0x30 + bit;
+                bit_count += 1;
+            }
+
+            if (bit_count >= BITFRAMELEN) {
+                bit_count = 0;
+                header_found = 0;
+
+                print_frame();
+            }
+
+        }
+        if (header_found && option_b) {
+            bitstart = 1;
+
+            while ( bit_count < BITFRAMELEN ) {
+                if (read_rawbit(fp, &bit) == EOF) break;
+                frame_bits[bit_count] = 0x30 + bit;
+                bit_count += 1;
+            }
+
+            bit_count = 0;
+            header_found = 0;
+
+            print_frame();
+        }
+    }
+    printf("\n");
+
+    fclose(fp);
+
+    return 0;
+}
+