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 1 to make the Alsa audio code write zeros to the audio device
              when there is no audio to write available. This may be needed for some audio devices that  take  a
              long time to recover from an underflow condition.

AUTHOR

       Tobias Blomberg (SM0SVX) <sm0svx at users dot sourceforge dot net>

REPORTING BUGS

       SvxLink Devel <svxlink-devel at lists dot sourceforge dot net>

SEE ALSO

       svxlink(1), remotetrx(1), svxlink.conf(5)