NAME

       gen_packets - Generate audio file for AX.25 frames.

SYNOPSIS

       gen_packets -o wav-file-out [ options ] [ text-file | - ]

              wav-file-out is the result.  The -o option is required.

              text-file  may contain AX.25 packets in the standard monitoring format.  Use "-" to
              read from stdin.  If not specified, a default builtin message will be used.

DESCRIPTION

       gen_packets is a test application which converts text to AX.25 audio  for  testing  packet
       decoders.

       It  is  very  flexible  allowing a wide range of audio sample rates, data speeds, and AFSK
       tones.  It will even generate the scrambled signals commonly used for 9600 baud operation.

OPTIONS

       -a n   Signal amplitude in range of 0-200%.  Default 50.  Note that 100% is corresponds to
              signal peaks of +/- 16383 so we have plenty of headroom to avoid saturation.

       -b n   Bits / second for data.  Default is 1200.

       -B n   Data  rate  in  bits/sec  for  first channel.  Standard values are 300, 1200, 2400,
              4800, 9600.
                     300 bps defaults to AFSK tones of 1600 & 1800.
                     1200 bps uses AFSK tones of 1200 & 2200.
                     2400 bps uses QPSK based on V.26 standard.
                     4800 bps uses 8PSK based on V.27 standard.
                     9600 bps and up uses K9NG/G3RUH standard.
                     EAS for Emergency Alert System (EAS) Specific Area Message Encoding (SAME).

       -g     Force G3RUH modem regardless of data rate.

       -j     2400 bps QPSK compatible with Dire Wolf <= 1.5.

       -J     2400 bps QPSK compatible with MFJ-2400.

       -X n   1 to enable FX.25 transmit.  16, 32, 64 for specific number of check bytes.

       -I n   Enable IL2P transmit.  n=1 is recommended.  0 uses weaker FEC.

       -i n   Enable IL2P transmit, inverted polarity.  n=1 is recommended.  0 uses weaker FEC.

       -m n   Mark frequency.  Default is 1200.

       -s n   Space frequency.  Default is 2200.

       -r n   Audio sample Rate.  Default is 44100.

       -n n   Generate specified number of frames with increasing noise.  (For  built-in  message
              only.)

       -o file
              Send output to .wav file.

       -8     8 bit audio rather than 16.

       -2     2 channels of audio rather than 1.

       -vmax[,incr]
              Variable speed with specified maximum error and optional increment.

EXAMPLES

       gen_packets -o x.wav

              With  all  defaults,  a  built-in  test message is generated with standard Bell 202
              tones used for packet radio on ordinary VHF FM transceivers.

       gen_packets -o x.wav -g -b 9600
       gen_packets -o x.wav -B 9600

              Both of these are equivalent.  "-B 9600" automatically selects  scrambled  baseband
              rather than AFSK.

       gen_packets -o x.wav -m 1600 -s 1800 -b 300
       gen_packets -o x.wav -B 300

              Both of these generate 200 Hz shift, 300 baud, suitable for HF SSB transceiver.

       echo -n 'WB2OSZ>WORLD:Hello, world!' | gen_packets -a 25 -o x.wav -
       atest x.wav

              Read  message  from stdin and put quarter volume sound into the file x.wav.  Decode
              the sound file.

SEE ALSO

       More      detailed      information      is      in      the      PDF       files       at
       https://github.com/wb2osz/direwolf/tree/master/doc/.

       Applications  in this package: aclients, atest, cm108, decode_aprs, direwolf, gen_packets,
       kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll

                                                                                   GEN_PACKETS(1)