[OZAPRS] RF modulations techniques
Andrew Rich
vk4tec at tech-software.net
Mon Nov 13 07:32:57 EST 2006
Gudday
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
1Mb/s
They can send GPS co-ords in 112us
Cheers
Andy
-----------------------------------------
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec at tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
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