smdiag(8)

1SMDIAG(8)                  Linux Programmer's Manual                 SMDIAG(8)
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NAME

6       smdiag - Linux soundcard packet radio modem driver diagnostics utility
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SYNOPSIS

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

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

21       smdiag accepts the following options:
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24       -i     The  device  argument specifies the soundcard modem device which
25              should be configured or interrogated.  It will usually have  the
26              following form: sm[0-3].
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28       -d     sets the address of the X server to display the window.
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30       -h     display an overview of the available command line parameters and
31              exit.
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33       -c     toggle the carrier gating of the display.
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35       -e     display an eye diagram (overlay of the synchronized  demodulator
36              output) instead of an oscilloscope view of the input signal.
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KEYS

40       C      clears the window
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42       D      toggles the DCD gating.
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44       E      displays an eye diagram
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46       I      displays the input signal
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48       Q      quits smdiag
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BUGS

52       smdiag  Reacts  sluggishly to keypresses. The window size is fixed. For
53       speed reasons, two square root operations per  sample  are  not  imple‐
54       mented  in  the AFSK 1200 baud modes. The eye diagram for the AFSK 1200
55       baud mode is therefore distorted.
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AUTHOR

63       smdiag was written by Thomas Sailer (sailer@ife.ee.ethz.ch).
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69Smdiag 0.1                      1 October 1996                       SMDIAG(8)