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KP edited this page May 18, 2025 · 1 revision

This page covers tuning parameters and configuration options for toc-lp-kit.

🛠 Environment Variables

You can customize the SDR pipeline by setting these variables in a .env file or directly in docker-compose.yml:

SDR_FREQUENCY=7.078000M
SDR_MODE=usb
SDR_SAMPLE_RATE=12k
SDR_GAIN=25

Then reference them in the sdr service command:

rtl_fm -f ${SDR_FREQUENCY} -M ${SDR_MODE} -s ${SDR_SAMPLE_RATE} -g ${SDR_GAIN} \
  | sox -t wav -r ${SDR_SAMPLE_RATE} -e signed -b 16 -c 1 - -t pulse js8loop

📶 PulseAudio Tuning

Keep JS8Call’s waterfall clean by adjusting the null-sink volume:

pactl set-sink-volume js8loop 75%

Inspect available sinks and levels:

pactl list sinks short

⏱ Chrony Time Sync

Default /etc/chrony/chrony.conf:

pool ntp.ubuntu.com iburst
makestep 1.0 3
driftfile /var/lib/chrony/chrony.drift
rtcsync

To add a GPS reference instead of NTP, append:

refclock SHM 0 offset 0.5 refid GPS

Place your custom file in chrony/chrony.conf before launching.

🎛 JS8Call Settings

JS8Call stores its settings in the js8-log volume under ~/.js8call:

  • settings.json – GUI preferences
  • decode.log – JSON-formatted message records

To change audio input, open JS8Call → File → Settings → Audio → select “Monitor of js8loop.”

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