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[aprssig] Net14 April Report -Soundmodem

John Goerzen jgoerzen at complete.org
Tue May 8 21:56:09 UTC 2012

So there are two separate projects with the same name that do pretty 
much the same thing?  The one I'm talking about is 
http://www.baycom.org/~tom/ham/soundmodem/ which runs on Linux as well 
as Windows and Solaris.  I have used it for both 1200bps VHF and 300bps 
HF packet.  It works well with the Linux ax25 stack and software like 
aprx or Xastir for APRS purposes.

It is also a purely soundcard-based software TNC.

I have some tips on using it here:


-- John

On 05/03/2012 10:59 AM, Stephen H. Smith wrote:
> On 5/3/2012 11:13 AM, John Goerzen wrote:
>> Where can we get more information about the soundmodem project?  Is 
>> that the same one that is used on Linux?
>> -- John
> This has nothing to do with Linux.
> The UZ7HO "Soundmodem"  is a purely soundcard-based dual-port 
> software-based TNC for 300, 600 and 1200 baud packet operation on any 
> version of Windows beginning with Windows 2000.
> It's a drop-in replacement for the AGW Packet Engine used in it's 
> sound card mode (i.e. not in AGW's role as a port manger sharing 
> multiple TNCs with any number of packet-using apps).   The Soundmodem 
> exactly mimics AGW's  API, and will work with any program currently  
> offering an AGW option as an alternative to a hardware TNC(s).  Some 
> of the programs that support AGWpe (and thus the UZ7HO "Soundmodem") 
> are WinAPRS, UIview, APRSpoint and APRSis32.
> Compared to AGWpe:
>   * The soundmodem is less tweaky and touchy about sound card setup,
>     timing and audio levels.
>   * The soundmodem can be set to any desired audio tone pair on 300
>     baud HF mode, in a manner similar to most PSK31 programs.  (The
>     freeware version of AGWpe is fixed at 2100/2300 audio tones on HF
>     which causes problems with many HF/SSB transceivers with narrow
>     passbands. The pay-for AGWpe "Pro" version does allow you to
>     select the KAM-style 1600/1800 tone pair that is much less
>     problematic with SSB transceivers.   The Soundmodem lets you use
>     ANY tone pair -- for example selecting a tone pair that matches
>     the passband of a 500 Hz CW filter in the radio.)
>   * In addition to dual waterfall displays (one for each port), the
>     Soundmodem has a built-in raw packet display that allows you to
>     immediately see if it is functioning correctly and decoding
>     packets,  without needing to start up an external application.  
>     Very useful for debugging initial setups -- it immediately
>     eliminates the uncertainty of whether "no decode" problems are in
>     the link between the soundcard program and the external
>     application, or inside the sound card and sound card app itself.
>   * The soundmodem is the highest-performing packet TNC for noisy HF
>     modes that I have ever tested.  It runs circles around any
>     hardware-based devices such as PK-232s or KAMs.
>   * And finally,  it is FREE!!!
> Despite it's rather sophisticated DSP, I am using this soundcard app 
> combined with UIview on a mere 877 MHz Pentium III,  and on an Acer 
> ZG-5 Netbook with a 1GHz Intel "Atom" processor (i.e. rather wimpy 
> CPU),  with no difficulty.  The original site for the Soundmodem is 
> the author's website at:
> . <http://uz7.ho.ua/modem_beta/>
> I have repackaged the original "dumb zipfile" distribution into a 
> full-blown standard Windows "wizard-type" automated installer that 
> includes a user manual, creates a Windows Start Menu group, desktop 
> short cuts, etc.    Download it from my website at:
> . < http://wa8lmf.net/miscinfo/UZ7HO-Soundmodem-Install-Ver-0.44-Beta.exe>
> ------------------------------------------------------------------------
> --
> Stephen H. Smith    wa8lmf (at) aol.com
> Skype:        WA8LMF
> Home Page: http://wa8lmf.net
> High Quality Calibrated Static Maps for Any APRS App
> http://wa8lmf.net/aprs/PM9_StatiicMap_Export.htm
>  Vista & Win7 Install Issues for UI-View and Precision Mapping
> http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7
> "APRS 101"  Explanation of APRS Path Selection & Digipeating
> http://wa8lmf.net/DigiPaths
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