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[aprssig] APRS next gen

Scott Miller scott at opentrac.org
Thu Sep 20 19:31:59 UTC 2007


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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