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[aprssig] APRS next gen

Andrew Rich vk4tec at people.net.au
Thu Sep 20 19:37:50 UTC 2007


Oh its not FM at all ;-)

I was thinking 1200 MHz ham band

The current aircraft ADS-B systems use PPM at 1Mb PPM

On another note, I saw a cool laser based aircraft tracking system - AC has
a reflector and tracking follows plane - kewl



----------------------------------------------------------------------------
Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>
http://www.tech-software.net




-----Original Message-----
From: Scott Miller [mailto:scott at opentrac.org]
Sent: Friday, 21 September 2007 5:32 AM
To: vk4tec at people.net.au; TAPR APRS Mailing List
Subject: Re: [aprssig] APRS next gen


A while back on one of the ballooning lists we were discussing PPM using
a strobe light.  I'm not really sure about what'd be involved in doing
it with RF, though.

PPM seems like a good option when you've got the ability to generate
short, high-power pulses.  I don't think it'd be compatible or relevant
for FM operation, though.

Scott
N1VG

Andrew Rich wrote:
> I have been playing with a few concepts
>
> 1. My current AX25 1200 baud takes about 3 seconds to tx a packet (on
> average)
>
> 2. The 434 MHz transmitter I made up takes around 25 ms to send a packet.
>
> 3. ADS-B takes 112uS to transmitt.
>
> I would like one day to play with PPM (Pulse Positon Modulation) for APRS.
>
> Unfortunately I am no good at FPGA programming.
>
>
>
> --------------------------------------------------------------------------
--
> Andrew Rich VK4TEC
> vk4tec at people.net.au <mailto:vk4tec at people.net.au>
> http://www.tech-software.net <http://www.tech-software.net/>
>
>
>
>
>
> ------------------------------------------------------------------------
>
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