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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 for- mat. 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 com- monly 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 head- room 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 stan- dard Bell 202 tones used for packet radio on ordinary VHF FM trans- ceivers. 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/dire- wolf, or possibly /usr/share/doc/direwolf, depending on installation loca- tion. Applications in this package: aclients, atest, cm108, decode_aprs, dire- wolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll GEN_PACKETS(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO
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