1GEN_PACKETS(1)              General Commands Manual             GEN_PACKETS(1)
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NAME

6       gen_packets - Generate audio file for AX.25 frames.
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SYNOPSIS

11       gen_packets -o wav-file-out [ options ] [ text-file | - ]
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13              wav-file-out is the result.  The -o option is required.
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15              text-file  may  contain AX.25 packets in the standard monitoring
16              format.  Use "-" to  read  from  stdin.   If  not  specified,  a
17              default builtin message will be used.
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DESCRIPTION

21       gen_packets  is  a  test application which converts text to AX.25 audio
22       for testing packet decoders.
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24       It is very flexible allowing a wide range of audio sample  rates,  data
25       speeds,  and  AFSK  tones.  It will even generate the scrambled signals
26       commonly used for 9600 baud operation.
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OPTIONS

31       -a n   Signal amplitude in range of 0-200%.   Default  50.   Note  that
32              100%  is  corresponds  to  signal  peaks of +/- 16383 so we have
33              plenty of headroom to avoid saturation.
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36       -b n   Bits / second for data.  Default is 1200.
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39       -B n   Data rate in bits/sec for first channel.   Standard  values  are
40              300, 1200, 2400, 4800, 9600.
41                     300 bps defaults to AFSK tones of 1600 & 1800.
42                     1200 bps uses AFSK tones of 1200 & 2200.
43                     2400 bps uses QPSK based on V.26 standard.
44                     4800 bps uses 8PSK based on V.27 standard.
45                     9600 bps and up uses K9NG/G3RUH standard.
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48       -g     Force G3RUH modem regardless of data rate.
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51       -j     2400 bps QPSK compatible with Dire Wolf <= 1.5.
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54       -J     2400 bps QPSK compatible with MFJ-2400.
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58       -m n   Mark frequency.  Default is 1200.
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61       -s n   Space frequency.  Default is 2200.
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64       -r n   Audio sample Rate.  Default is 44100.
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67       -n n   Generate specified number of frames with increasing noise.  (For
68              built-in message only.)
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71       -o file
72              Send output to .wav file.
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75       -8     8 bit audio rather than 16.
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78       -2     2 channels of audio rather than 1.
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EXAMPLES

83       gen_packets -o x.wav
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85              With all defaults, a built-in test  message  is  generated  with
86              standard Bell 202 tones used for packet radio on ordinary VHF FM
87              transceivers.
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89       gen_packets -o x.wav -g -b 9600
90       gen_packets -o x.wav -B 9600
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92              Both of these are equivalent.  "-B 9600"  automatically  selects
93              scrambled baseband rather than AFSK.
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95       gen_packets -o x.wav -m 1600 -s 1800 -b 300
96       gen_packets -o x.wav -B 300
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98              Both  of  these generate 200 Hz shift, 300 baud, suitable for HF
99              SSB transceiver.
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101       echo -n 'WB2OSZ>WORLD:Hello, world!' | gen_packets -a 25 -o x.wav -
102       atest x.wav
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104              Read message from stdin and put quarter volume  sound  into  the
105              file x.wav.  Decode the sound file.
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SEE ALSO

108       More    detailed    information    is    in    the    pdf    files   in
109       /usr/local/share/doc/direwolf,  or  possibly   /usr/share/doc/direwolf,
110       depending on installation location.
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112       Applications  in  this  package:  aclients,  atest, cm108, decode_aprs,
113       direwolf, gen_packets, kissutil,  ll2utm,  log2gpx,  text2tt,  tt2text,
114       utm2ll
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119                                                                GEN_PACKETS(1)
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