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 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.
Tobias Blomberg (SM0SVX) <sm0svx at users dot sourceforge dot net>
SvxLink Devel <svxlink-devel at lists dot sourceforge dot net>
svxlink(1),
remotetrx(1),
svxlink.conf(5)