[OZAPRS] HF APRS with linux soundmodem.

Steve stevez at tpg.com.au
Wed Jun 18 20:52:26 EST 2008


No worries. I didn't want to get yelled at for dragging discussion too 
far off topic!
There are probably better forums to get info about soundmodem and 
Xastir, but I also bet there are lots of people on this list that use 
this combo too.
I'll try to help if I can.
Starting with soundmodem, an example of a working 
/etc/ax25/soundmodem.conf is :-
----- snip ----
<?xml version="1.0"?>
<modem>
  <configuration name="APRS">
    <channel name="Channel 0">
      <mod mode="afsk" bps="1200" f0="1200" f1="2200" diffenc="1"/>
      <demod mode="afsk" bps="1200" f0="1200" f1="2200" diffdec="1"/>
      <pkt mode="KISS" ifname="sm0" hwaddr="" ip="10.0.0.1" 
netmask="255.255.255.0" broadcast="10.0.0.255" file="/dev/soundmodem0" 
unlink="1"/>
    </channel>
    <chaccess txdelay="150" slottime="100" ppersist="40" fulldup="0" 
txtail="10"/>
    <audio type="soundcard" device="/dev/dsp" halfdup="0"/>
    <ptt file="/dev/ttyS0"/>
  </configuration>
</modem>

----- snip -----

You should be able to check receive audio levels using the inbuilt scope 
functions of soundmodemconfig. Once you think you have levels correct, 
you should be able to run soundmodem, and see decoded packets displayed 
in the terminal window you started soundmodem from. If that works you 
are well on your way.
Anyway, what problems are you having?


vk3xci wrote:
> No Steve,
>
> Keep it on list...
> Ive been trying to get soundmodem to work for 1200 too!
>
>
>
> Steve wrote:
>
>>
>> Happy to help (if I can) with Soundmodem/Xastir/VHF setup if you 
>> contact me off list.
>>
>> Anyone got this working on HF though?
>>
>> Steve.
>>
>
>
> Norm
> Vk3XCI
>
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> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs
>
>
>

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