Packages Svxlink Calibration Tools

svxlink-calibration-tools

Sets the audio levels an SvxLink node needs to work properly

• Version recorded: 24.02
• Categories: echolink-repeaters
• Upstream: https://www.svxlink.org
• Install after: svxlink-server

What it does

Tools for measuring and setting the transmit and receive audio levels between a computer and a radio in an SvxLink installation, including the CTCSS tone level and the deviation of the transmitted signal.

Why you would want it

Audio level is the single most common reason a repeater controller works on the bench and badly on the air. Over-deviation sounds distorted and splatters; under-deviation is quiet and fails to open squelch on distant receivers. Both are invisible without measurement, and this is the measurement.

Before it will work

A configured SvxLink installation and a radio connected. A second receiver to listen on helps considerably and is not required.

How it installs

• apt: svxlink-calibration-tools

Known problems

Getting levels right is iterative and takes longer than people expect, which is why it is so often skipped. The tools measure what the sound card sees; the radio's own microphone gain and compressor sit between that and the transmitted signal, so a correct reading here does not guarantee correct deviation without checking on the air.

Keeping it current

• probe: apt policy
• strategy: apt_upgrade

Where to get help with the software itself

Tobias Blomberg, SM0SVX -- part of the SvxLink project.

Source: catalog/packages/svxlink-calibration-tools.yaml