The "-Q" (frequency) option gives the frequency of the first of the four channels; the remaining channel frequencies appear at regular intervals (default spacing is 100 KHz). The ysf channel format may be set to "wide", using "-R" (default=narrow). The "-q" option is needed for PPM correction (unless a time base such as GPSDO is used). -The input file ("-f" option) requires WAV format, 8000 samples/sec, S16_LE. Audio from the WAV file is transmitted on all frequencies. However if the "-A" (audio) option is given, program content for the second DMR time slot is instead taken live from the sound card audio input port ("-I" option). +The input file ("-f" option) requires WAV format, 8000 samples/sec, S16_LE. Audio from the WAV file is transmitted on all frequencies. However if the "-A" option is given, program content for the second DMR time slot is instead taken live from the sound card audio input port ("-I" option).
-f filename (or -F filename in DMR mode) is selected the input is read from file(s); otherwise the GR audio source is selected. Likewise output is sent to the soundcard unless -o is given. When using files the -r option can be specified to replay the input file(s) in a continuous loop. Without this option the program exits at EOF. The -p protocol option is used to select which of the four DV standards (dmr, dstar, p25 or ysf) is to be used. The dmr and ysf modes also utilize a configuration file, specified using the -c filename parameter. See the specific section (below) for more details on the configuration file.