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 (sailer@ife.ee.ethz.ch).