GEN_PACKETS(1)

💖 GEN_PACKETS(1) — General Commands Manual 💖

okay so bestie, this is the GEN_PACKETS(1) page from the General Commands Manual, and it's literally here to make AX.25 audio files for testing packet decoders. ✨

🌸 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. No cap. 🫶

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's giving test-lab main character energy. 🧪💜

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. highkey iconic. 🔥

✨ OPTIONS ✨

• -a n — Signal amplitude in range of 0-200%. Default 50. Note that 100% 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 in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location. 🐺📚

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

---

💖 That's the GEN_PACKETS(1) page from the General Commands Manual — source/version/date info wasn't in the footer beyond GEN_PACKETS(1), so signing off, bestie! 🎀✨