---
name: "siglevdetcal"
section: "1"
platform: "linux"
package: "svxlink-calibration-tools"
version: "24.02-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/siglevdetcal"
---

# siglevdetcal(1)

The SvxLink signal level detector calibration utility

## NAME

siglevdetcal - The SvxLink signal level detector calibration utility

## SYNOPSIS

**siglevdetcal \<***configuration file***\> \<***RX config section name***\>**

## DESCRIPTION

**siglevdetcal** is the SvxLink signal level detector calibration utility. It is used to assist in the setup of the SIGLEV\_SLOPE and SIGLEV\_OFFSET configuration variables for a local receiver. The signal level detector need to be calibrated if a voter or the SIGLEV squelch detector is going to be used.

The calibration procedure is quite simple and everything is more or less explained at run-time. The procedure is outlined below.

- •

  Disconnect the antenna and the PTT cable. The PTT might be triggered by the siglevdetcal utility. If you want to be really sure that no harm come to your transceiver, connect a dummy load.

- •

  Setup the audio input level. The audio input level must not be changed after the calibration has been done.

- •

  Start the siglevdetcal utility.

- •

  Transmit on another radio so that the receiver under calibration will receive full signal strength.

- •

  Still holding the PTT, press ENTER and wait until the squelch open level measurements have been done.

- •

  Release the PTT. Make sure the squelch is open so that only noise is received.

- •

  Press ENTER to start the squelch close level measurements.

- •

  When finished, the two config variables SIGLEV\_SLOPE and SIGLEV\_OFFSET are printed. Put these in your configuration file under the corresponding receiver configuration section.

- •

  Start the SvxLink server and verify that full signal strength is showed as about 100 and open squelch is showed as about 0. If full signal strength is not showed, you might have to setup SQL\_DELAY to delay the signal level measurement until the signal is stable.

## ENVIRONMENT

- ASYNC\_AUDIO\_NOTRIGGER

  Set this environment variable to 1 if you get an error about **ioctl: Broken pipe** when the remotetrx server starts.

- ASYNC\_AUDIO\_ALSA\_ZEROFILL

  Set this environment variable to 0 to stop the Alsa audio code from writing zeros to the audio device when there is no audio to write available. ASYNC\_AUDIO\_UDP\_ZEROFILL Set this environment variable to 1 to enable the UDP audio code to write zeros to the UDP connection when there is no audio to write available.

## AUTHOR

Tobias Blomberg (SM0SVX) \<sm0svx at svxlink dot org\>

## REPORTING BUGS

Bugs should be reported using the issue tracker at https://github.com/sm0svx/svxlink.

Questions about SvxLink should not be asked using the issue tracker. Instead use the group set up for this purpose at groups.io: https://groups.io/g/svxlink

## SEE ALSO

[**svxlink**(1)](/svxlink/1.md), [**remotetrx**(1)](/remotetrx/1.md), [**svxlink.conf**(5)](/svxlink.conf/5.md)