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).