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GEN_PACKETS(1) General Commands Manual GEN_PACKETS(1)

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

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.

Bits / second for data. Default is 1200.

Bits / second for data. Proper modem selected for 300, 1200, 9600.

Scrambled baseband rather than AFSK.

Mark frequency. Default is 1200.

Space frequency. Default is 2200.

Audio sample Rate. Default is 44100.

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

Send output to .wav file.

-8
8 bit audio rather than 16.

-2
2 channels of audio rather than 1.

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 in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location.

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