MINIMODEM(1)						      General Commands Manual						      MINIMODEM(1)

NAME

       minimodem - software audio Bell-type or RTTY FSK modem

SYNOPSIS

       minimodem --tx [options] {baudmode}
       minimodem --rx [options] {baudmode}

DESCRIPTION

       minimodem  is  a command-line program which generates (or decodes) audio modem tones at any specified baud rate, emulating an old Bell-type
       or radio-teletype FSK modem.  The tones can be played to (or recorded from) the PulseAudio system or to an audio file.

       minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers
       using radio, telephone, or another audio communications medium.

TX
/RX MODE
       -t, --tx, --transmit, --write
	      transmit mode: generate audio tones

       -r, --rx, --receive, --read
	      receive mode: decode audio tones

OPTIONS

       -a, --auto-carrier
	      automatically detect mark and space frequences from carrier

       -c, --confidence threshold
	      set receive confidence threshold (0.0 to 1.0, default 0.6)

       -8, --ascii
	      ASCII  8-N-1

       -5, --baudot
	      Baudot 5-N-1.5

       -f, --file filename.wav
	      encode or decode an audio file (extension sets audio format)

       -b, --bandwidth {rx_bandwidth}

       -M, --mark {mark_freq}

       -S, --space {space_freq}

       -T, --txstopbits {m.n}

       -q, --quiet
	      Do not report CARRIER / NOCARRIER or signal analysis metrics.

       -V, --version
	      print program version

{baudmode}
       The  required  {baudmode}  parameter  may  be  any  floating-point value to specify a baud rate, or the string "rtty".  The {baudmode} also
       implies certain other parameter defaults depending on the rate, including standard (or at least reasonable) default  mark  and  space  tone
       frequencies.

       1200	   : Bell202  1200 bps --ascii

       300	   : Bell103   300 bps --ascii

       rtty	   : RTTY    45.45 bps --baudot --txstopbits 1.5

       {any floating point value N}
		   : Bell-like	 N bps --ascii

EXAMPLES

       minimodem --tx 100
	      Transmit 100 baud tones from one computer ...

       minimodem --rx 100
	      and receive 100 baud tones on another nearby computer.

       minimodem --rx --auto-carrier rtty
	      Decode amateur radio RTTY signals (listen near 14.085 MHz).

       minimodem --tx 0.5
	      Experiment with very low baud rates (works in noisy conditions).

       minimodem --tx 12000
	      Experiment with very high baud rates works (works with audio files).

NOTES

       minimodem does not decode AX.25 framed packets.

       minimodem does not support modem control ("AT") commands, nor does it produce DTMF telephone dialing tones.

VERSION

       This page documents minimodem version 0.8.1.  The latest version is available at <http://www.whence.com/minimodem>.

AUTHOR

       minimodem was written by Kamal Mostafa <kamal@whence.com>.

COPYRIGHT

       Copyright (C) 2011 by Kamal Mostafa <kamal@whence.com>.	License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

								   July 15, 2011						      MINIMODEM(1)