[aprssig] APRS Messenger is now multi-mode

Guy Mallery wa2msu at pacbell.net
Mon Jun 28 13:21:19 CDT 2010


hmmm, Multi-Mode Multi-Tasking... I like that.  I remember seeing
someone had done similar about ten years ago with soundcard GMDSS
software, but never went any further.

$10,000 for an HF rig @ 10% audio distortion or $300
for a Radeon graphics adapter with 1,600 GPU (processors).
CPU power (might be?) the way of the future...


73, Guy - W6MSU

> Date: Sun, 27 Jun 2010 23:44:18 +0100
> From: Chris Moulding <chrism at crosscountrywireless.net>
> Message-ID: <4C27D442.9070102 at crosscountrywireless.net>
> I've just released the latest version v2.64 of APRS Messenger.
> In addition to being able to send and receive APRS over PSK-63 it now 
> has options to transmit APRS over PSK-31, QPSK-31 and QPSK-63. The QPSK 
> modes have forward error correction so may work better under typical HF 
> conditions.
> The interesting feature that made it possible is that the program can 
> receive all modes at once with six receivers in software, one for each 
> mode or variant, decoding incoming signals looking for APRS packets.
> It's possible for stations to beacon and send and receive APRS messages 
> using different modes and speeds. For example a well sited HF igate 
> could use PSK-63 or QPSK-63 while a QRP station out in the wilderness 
> could use PSK-31 or QPSK-31. You could experiment with the different 
> modes to see what works best. HF Igates can run the program and Igate 
> all HF activity to the APRS-IS. Most APRS over PSK-63 activity is on 
> 10.1497 MHz in the US, Europe and Asia. There is an Igate in Australia 
> on 7.0347 MHz. Frequencies are actual RF frequencies not dial frequencies.
> Thanks to Robert, VA3ROM, Larry, W8LIW and Dave, K6MAR for their advice 
> and comments during the multi-mode development.
> It can be downloaded from:
> http://www.crosscountrywireless.net/aprs_messenger.htm
> 73,
> Chris, G4HYG

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