NAME

       smdiag - Linux soundcard packet radio modem driver diagnostics utility

SYNOPSIS

       smdiag [-i device] [-d display] [ -ce ]

DESCRIPTION

       smdiag  may  help  to adjust the audio levels of the soundcard modem driver, as well as to
       control the quality of the radio link. It may either display an oscilloscope like view  of
       the input signal, or display an eye diagram.  The display may be gated with DCD, i.e. only
       updated if the modem detects a data carrier.

OPTIONS

       smdiag accepts the following options:

       -i     The device argument specifies the soundcard modem device which should be configured
              or interrogated.  It will usually have the following form: sm[0-3].

       -d     sets the address of the X server to display the window.

       -h     display an overview of the available command line parameters and exit.

       -c     toggle the carrier gating of the display.

       -e     display  an eye diagram (overlay of the synchronized demodulator output) instead of
              an oscilloscope view of the input signal.

KEYS

       C      clears the window

       D      toggles the DCD gating.

       E      displays an eye diagram

       I      displays the input signal

       Q      quits smdiag

BUGS

       smdiag Reacts sluggishly to keypresses. The window size is fixed. For speed  reasons,  two
       square root operations per sample are not implemented in the AFSK 1200 baud modes. The eye
       diagram for the AFSK 1200 baud mode is therefore distorted.

SEE ALSO

       smmixer (8), sethdlc (8), linux/drivers/net/soundmodem.c

AUTHOR

       smdiag was written by Thomas Sailer (t.sailer@alumni.ethz.ch).