2011-06-23 01:10:31 +02:00
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.TH MINIMODEM 1 "June 22, 2011"
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.SH NAME
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minimodem \- software audio Bell-type or RTTY FSK modem
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.SH SYNOPSIS
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.B minimodem --tx
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.RI [ options ]
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.I {baudmode}
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.br
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.B minimodem --rx
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.RI [ options ]
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.I {baudmode}
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.SH DESCRIPTION
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.B minimodem
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is a command-line program which generates (or decodes) audio modem tones,
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emulating an old Bell-type or radio-teletype FSK modem.
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The tones are played to (or recorded from) the default system audio device
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or a file.
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.PP
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.B minimodem
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can be used to transfer data between nearby computers using an audio
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cable (or just via sound waves), or between remote computers using radio,
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telephone, or another audio communications medium.
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.SH "TX/RX MODE"
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.TP
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.B \-t, \-\-tx, \-\-transmit, \-\-write
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transmit mode: generate audio tones
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.TP
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.B \-r, \-\-rx, \-\-receive, \-\-read
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receive mode: decode audio tones
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.SH OPTIONS
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.TP
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.B \-8, \-\-ascii
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ASCII 8\-N\-1
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.TP
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.B \-5, \-\-baudot
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Baudot 5\-N\-1.5
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.TP
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2011-06-24 08:46:18 +02:00
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.B \-f, \-\-file filename.wav
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encode or decode an audio file (extension sets audio format)
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2011-06-23 01:10:31 +02:00
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.TP
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.B \-b, \-\-bandwidth {rx_bandwidth}
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.TP
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.B \-M, \-\-mark {mark_freq}
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.TP
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.B \-S, \-\-space {space_freq}
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.TP
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.B \-T, \-\-txstopbits {m.n}
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.SH {baudmode}
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The required \fI{baudmode}\fR parameter may be any floating-point value to
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specify a baud rate, or the string "rtty".
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The \fI{baudmode}\fR also implies certain other parameter defaults
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depending on the rate.
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.TP
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.B 1200
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: Bell202 1200 bps \-\-ascii
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.TP
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.B 300
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: Bell103 300 bps \-\-ascii (auto-rx-carrier)
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.TP
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.B N>=100
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: Bellxxx N bps \-\-ascii
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.TP
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.B N<100
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: RTTY N bps \-\-baudot
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.TP
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.B rtty
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: RTTY 45.45 bps \-\-baudot
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.SH EXAMPLES
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.TP
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.B minimodem --tx 100
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Transmit 100 baud tones from one computer ...
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.TP
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.B minimodem --rx 100
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and receive 100 baud tones on another nearby computer.
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.TP
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.B minimodem --rx rtty
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Decode amateur radio RTTY signals (listen near 14.085 MHz).
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.SH NOTES
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.B minimodem does not decode AX.25 framed packets.
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.PP
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.B minimodem
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does not support modem control ("AT") commands, nor does it produce
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DTMF telephone dialing tones.
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.SH AUTHOR
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.B minimodem
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was written by Kamal Mostafa <kamal@whence.com>.
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.SH COPYRIGHT
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Copyright \(co 2011 by Kamal Mostafa <kamal@whence.com>.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
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.br
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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