NAME

       multimon-ng - program to decode radio transmissions

SYNOPSIS

       multimon-ng [options] [input_file]

DESCRIPTION

       This  manual  page  documents  briefly  the  multimon-ng command. This manual page was written for Debian
       because the original program does not have a manual page.

       The multimon-ng software can decode a variety of digital transmission modes  commonly  found  on  VHF/UHF
       radio.  A  standard  PC  soundcard is used to acquire the signal from a transceiver. The decoding is done
       completely in software. Currently, the following modes are supported:

              •   AX.25

                  •   1200 Baud AFSK

                  •   2400 Baud AFSK (2 variants)

                  •   4800 Baud HAPN

                  •   9600 Baud FSK (G3RUH)

              •   POCSAG

                  •   512 Baud

                  •   1200 Baud

                  •   2400 Baud

              •   Selective call

                  •   CCIR

                  •   EEA

                  •   EIA

              •   Frequency Shift Keying

                  •   1200 Baud FSK (2200/1200 Hz)

                  •   1200 Baud FSK (2300/1100 Hz)

                  •   1200 baud FMS FSK

              •   Miscellaneous

                  •   DTMF

                  •   CW/Morse

                  •   EAS

                  •   FLEX

                  •   SCOPE

                  •   X10

                  •   ZVEI

       An arbitrary set of the above modes may run concurrently on the same input signal (provided the CPU power
       is sufficient), so you do not have to know in advance which mode is used. Note however  that  some  modes
       might  require  modifications  to  the  radio (especially the 9600 baud FSK and the POCSAG modes) to work
       properly.

       AX.25 - Amateur Packet Radio protocol datagram format.
       DTMF - Dual Tone Multi Frequency. Commonly used in in-band telephone dialing.
       EAS - Emergency Alert System.
       FLEX - a paging format.
       POCSAG (Post Office Code Standards Advisory Group) is a common paging transmission format.
       SCOPE - show samples in a rudimentary oscilloscope display on an X server.
       X10 - a home automation protocol.
       ZVEI - The German Electrical and Electronic Manufacturers' Association - paging tone format.

OPTIONS

       -t <type>
              Input file type (any other type than raw requires sox).  Allowed types: raw aiff au  hcom  sf  voc
              cdr dat smp wav maud vwe.

       -a <demod>
              Add demodulator (see below).

       -s <demod>
              Subtract demodulator.

       -c     Remove all demodulators (must be added with -a <demod>).

       -q     Quiet output messages.

       -v <num>
              Verbosity level (0-10).  For POCSAG and MORSE_CW '-v1' prints decoding statistics.

       -h     Print the help.

       -A     APRS mode (TNC2 text output).

       -m     Mute SoX warnings.

       -m     Call SoX in repeatable mode (e.g. fixed random seed for dithering).

       -n     Don't flush stdout, increases performance.

       -j     FMS: Just output hex data and CRC, no parsing.

       -e     POCSAG: Hide empty messages.

       -u     POCSAG: Heuristically prune unlikely decodes.

       -i     POCSAG: Inverts the input samples. Try this if decoding fails.

       -p     POCSAG: Show partially received messages.

       -f <mode>
              POCSAG:  Disables  auto-detection  and forces decoding of data as <mode> (<mode> can be 'numeric',
              'alpha', 'skyper' and 'auto')

       -b <level>
              POCSAG: BCH bit error correction level. Set 0 to disable, default is  2.   Lower  levels  increase
              performance and lower false positives.

       -C <cs>
              POCSAG: Set charset (default: US), where <cs> is one of: US, FR, DE, SE, SI

       -o <time>
              CW: Set threshold for dit detection (default: 500)

       -d <time>
              CW: Dit length in ms (default: 50)

       -g <time>
              CW: Gap length in ms (default: 50)

       -x     CW: Disable auto threshold detection

       -y     CW: Disable auto timing detection

       --timestamp
              Add a time stamp in front of every printed line

       --label <label>
              Add a label to the front of every printed line

       Where  <demod>  is  one  of:  POCSAG512  POCSAG1200  POCSAG2400 FLEX EAS UFSK1200 CLIPFSK FMSFSK AFSK1200
       AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI1 ZVEI2 ZVEI3 DZVEI PZVEI EEA EIA CCIR  MORSE_CW
       DUMPCSV X10 SCOPE
       The -a and -s options may be given multiple times to specify the desired list of demodulators.

EXAMPLE

       Decode signal modulations from a sound file /tmp/message.wav without using a SCOPE display:
       multimon-ng -s SCOPE -t wav /tmp/message.wav

       With  no  input  file  specified, the program listens directly to the sound card using PulseAudio.  So to
       decode (only) DTMF tones on the sound card input:
       multimon-ng -a DTMF

NOTICE

       Please note that monitoring commercial services may be prohibited in some countries, this software should
       therefore only be used to monitor the amateur radio service.

BUGS

       The DTMF and ZVEI decoders have more frequent spurious detection reports.

AUTHOR

       This  manual  page  was  written  by  A.  Maitland  Bottoms  <bottoms@debian.org>  and   Göran   Weinholt
       <weinholt@debian.org>  for  the  Debian  GNU/Linux  system  (but  may  be  used by others).  This is free
       software. You can redistribute it and/or modify it under the terms of the GNU General Public  License  as
       published by the Free Software Foundation; either version 2 of the License, or any later version.

                                                January 30, 2020                                  MULTIMON-NG(1)