soundmodem on laptop.. receive working, xmit not working.

From: James Washer (lzifov@roskapostia.tunk.net)
Date: Fri Jan 23 2004 - 06:57:31 EET

  • Next message: Tomi Manninen: "Re: soundmodem on laptop.. receive working, xmit not working."

    I've tried a new kernel (2.4.24 from kernel.org) but my soundcard modem is still not producing reasonable sounds. Receive works just fine.

    If I select the PTT button from soundmodemconfig, it makes a lot of 'noise' but this sounds to me to be quite a bit higher frequency that the 'hiss' sound of normal 1200baud AFSK.

    If I use the beacon command, or some other AX.25 commandline tool to 'send' a packet, the speaker just makes a clicking sound.

    If I stop soundmodem, and use the linux play command to play a simple music wave file, all sounds well.

    Any ideas? I'm in the process of building a soundmodem system on a desktop PC (as opposed to the laptop). I just want to check whether I get different results on a full PC than I do on the laptop.

    My /etc/ax25/soundmodem.conf is included below.

    thanks

     - jim

    <?xml version="1.0"?>
    <modem>
      <configuration name="config0">
        <channel name="Channel 0">
          <mod mode="afsk" bps="1200" f0="1200" f1="2200"/>
          <demod mode="afsk" bps="1200" f0="1200" f1="2200"/>
          <pkt mode="MKISS" ifname="sm0" hwaddr="KG7HH-2" ip="10.0.0.1" netmask="255.255.255.0" broadcast="10.0.0.255" file="/dev/soundmodem0" unlink="1"/>
        </channel>
        <chaccess txdelay="400" slottime="100" ppersist="40" fulldup="1" txtail="10"/>
        <audio type="soundcard" device="/dev/dsp" halfdup="1"/>
        <ptt file="none"/>
      </configuration>
    </modem>
    -
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