multimon(1) [debian man page]

MULTIMON(1)						      General Commands Manual						       MULTIMON(1)

NAME

       multimon - program to decode radio transmissions

SYNOPSIS

       multimon [options] [input_file]

DESCRIPTION

       This  manual  page  documents briefly the multimon command.  This manual page was written for the Debian GNU/Linux distribution because the
       original program does not have a manual page.

       The multimon software can decode a variety of digital transmission modes commonly found on 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
			o 1200 Baud AFSK
			o 2400 Baud AFSK (2 variants)
			o 4800 Baud HAPN
			o 9600 Baud FSK (G3RUH)

	   * POCSAG
			o 512 Baud
			o 1200 Baud
			o 2400 Baud

	   * Miscellaneous
			o DTMF
			o ZVEI
			o SCOPE

       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
       POCSAG (Post Office Code Standards Advisory Group) is a common paging transmission format.
       DTMF - Dual Tone Multi Frequency. Commonly used in in-band telephone dialing.
       ZVEI- The German Electrical and Electronic Manufacturers' Association - paging tone format.
       SCOPE - show samples in a rudimentary oscilloscope display on an X server.

       Multimon does not decode Morse code signals.

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

       -s <demod>
	      subtract demodulator

       Where <demod> is one of: POCSAG512 POCSAG1200 POCSAG2400 EAS AFSK1200 AFSK2400 AFSK2400_2 HAPN4800 FSK9600 DTMF ZVEI 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 -s SCOPE -t wav /tmp/message.wav

       With  no input file specified, the program listens directly to the sound card using the /dev/dsp interface.  So to decode (only) DTMF tones
       on the sound card input:
       multimon -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.

SEE ALSO

       gen(1) http://www.qsl.net/kb9mwr/projects/pager/Two-Tone%20Pager%20Decoding%20Using%20Multimon.pdf

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>, for the Debian GNU/Linux system (but may be used by others).

								   June 19, 2000						       MULTIMON(1)

Check Out this Related Man Page

BAYCOM(9)						      Kernel Reference Guide							 BAYCOM(9)

NAME

       baycom - amateur (AX.25) packet radio network driver for baycom modems

SYNOPSIS

       #include <linux/baycom.h>
       #include <linux/hdlcdrv.h>

DESCRIPTION

       The driver currently supports three different modems: ser12, par96 and par97.

   ser12
       This  is a very simple 1200 baud AFSK modem. The modem consists only of a modulator/demodulator chip, usually a TI TCM3105. The computer is
       responsible for regenerating the receiver bit clock. The modem connects to a serial port, hence the name. Since the serial port is not used
       as  an  async serial port, the kernel driver for serial ports cannot be used, and this driver only supports standard serial hardware (8250,
       16450, 16550).

   par96
       This is a modem for 9600 baud FSK compatible to the G3RUH standard.  The modem does all the filtering and regenerates the  receiver  clock.
       Data  is transferred from and to the PC via a shift register.  The shift register is filled with 16 bits and an interrupt is signalled. The
       PC then empties the shift register in a burst. This modem connects to the parallel port, hence the name.

   par97
       This is a redesign of the par96 modem by Henning Rech, DF9IC. The modem is protocol compatible to par96, but uses only three low power  ICs
       and can therefore be fed from the parallel port and does not require an additional power supply.

IOCTL CALLS

       The ioctl calls follow the implementation in the hdlcdrv.

       BAYCOMCTL_GETMODEMTYPE
	      returns the modem type (i.e. ser12 or par96) and the options in effect (currently only the source of the DCD signal)

       BAYCOMCTL_SETMODEMTYPE
	      sets the modem type and the options. Only superuser can do this.

       BAYCOMCTL_GETDEBUG
	      return some debugging values. Not always available.

SEE ALSO

       baycom (9), soundmodem (9), linux/drivers/net/hdlcdrv.c,

AUTHOR

       baycom was written by Thomas Sailer, HB9JNX/AE4WA, (t.sailer@alumni.ethz.ch).

Linux 2.1.x							  2 October 1996							 BAYCOM(9)

Linux and UNIX Man Pages

multimon(1) [debian man page]

Check Out this Related Man Page