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[aprssig] RF modulations techniques

Andrew Rich vk4tec at tech-software.net
Sun Nov 12 20:32:57 UTC 2006


I was driving along as you do and pondered this thought.

The existing packet radio systems turn data into tones and then modulate up
to vhf and then do the reverse.

A digi comes back down to audio and the does the reverse.

I asked myself why don't we just modulate at RF levels and use transponders
as digis ?

How does D-STARS fit into the APRS equation ?

Anybody ever played with PulsePositionModulation on APRS ? Planes use it at

They can send GPS co-ords in 112us


Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec at tech-software.net
web: http://www.tech-software.net

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