Decoding packet radio with a PC sound card

Decoding packet radio with a PC sound card

Post by coloc » Mon, 03 Feb 2003 13:30:05

Can anyone point me to a site (or thread) that would help me
understand how to decode packets received on my scanner, then
connected to the mic input on my PC via the discriminator port on my
scanner.  I know it has been done before and have had some success by
tapping into the bit stream using the waveIn* functions.  However, I
am lacking the knowledge to "decode" the data at a certain baud rate
and making any sense of the bit stream.

thanks for any pointers (no pun intended)

tpzxr5

 
 
 

Decoding packet radio with a PC sound card

Post by Fran » Mon, 03 Feb 2003 20:23:30



^ ... how to decode packets received on my scanner, then
^ connected to the mic input on my PC via the discriminator port ...

I haven't looked at it yet but it appears that there is some freely usable
code that may save you a lot of work. Look through the downloads at
TrunkedRadio.net for the file CAPTURE.ZIP:

  <http://www.trunkedradio.net/modules.php?name=Downloads>

The file README.TXT from the archive:

========================================================================
       CONSOLE APPLICATION : capture
========================================================================

AppWizard has created this capture application for you.

This file contains a summary of what you will find in each of the files that
make up your capture application.

capture.dsp
    This file (the project file) contains information at the project level
and
    is used to build a single project or subproject. Other users can share
the
    project (.dsp) file, but they should export the makefiles locally.

capture.cpp
    This is the main application source file.

/////////////////////////////////////////////////////////////////////////////
Other standard files:

StdAfx.h, StdAfx.cpp
    These files are used to build a precompiled header (PCH) file
    named capture.pch and a precompiled types file named StdAfx.obj.

/////////////////////////////////////////////////////////////////////////////
Other notes:

AppWizard uses "TODO:" to indicate parts of the source code you
should add to or customize.

/////////////////////////////////////////////////////////////////////////////

Frank

 
 
 

Decoding packet radio with a PC sound card

Post by John » Tue, 04 Feb 2003 12:52:17

Check your email

Quote:> Can anyone point me to a site (or thread) that would help me
> understand how to decode packets received on my scanner, then
> connected to the mic input on my PC via the discriminator port on my
> scanner.  I know it has been done before and have had some success by
> tapping into the bit stream using the waveIn* functions.  However, I
> am lacking the knowledge to "decode" the data at a certain baud rate
> and making any sense of the bit stream.

> thanks for any pointers (no pun intended)

> tpzxr5