[aprssig] Digital two-way Radio communication in emergency situations

SARTrack Admin info at sartrack.co.nz
Mon Sep 8 03:11:40 EDT 2014

Thanks everyone for their input.

I am still looking for a digital transmission unit which can transmit 
data in a higer modulation scheme.
I actually just found an interesting company who sells just that, but I 
assume this gear is going to be very expensive. They use OFDM on Time 
Division Multiplex 256-QAM modulation, which enables them to transmit up 
to 56Kb on a 12.5 Kc channel, but it would require a huge amount of FEC. 
I would think something like 8PSK would be more suitable for what I have 
in mind.

Anyway, its interesting stuff.


SARTrack Developer and CEO

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