siglevdetcal - The SvxLink signal level detector calibration
utility
siglevdetcal <configuration file>
<RX config section name>
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.
- 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.
Tobias Blomberg (SM0SVX) <sm0svx at svxlink dot org>
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
svxlink(1), remotetrx(1), svxlink.conf(5)