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[aprssig] Protocols

Robert Bruninga bruninga at usna.edu
Fri Apr 4 17:48:17 UTC 2008


> That's not counting the bytes in the 
> destination address field, though! 

If you are going to send it over AX.25 packet you are stuck with
the AX.25 addresses.  So the Mic-E only uses 9 bytes.  And those
9 bytes carry not just position, but also includes Course,
Speed, a symbol code for over 3000 different symbols, and a 3
bit message code.

> We were talking about how compact you can make things 
> without worrying about backwards compatibility.

But, As you know, I worry *very much* about maintaining
compatibility of all APRS systems for all users...

> ----original message -------
> >> What I found is that even in my own dabblings 
> >> here, I can pack data much more efficiently.
> >> Astrerix works something like this
> >>  
> >> 40 00 16 30 27 34 56 43 45 45 67
> >>  
> > 
> > But a Mic-E packet only takes 9 Data bytes:
> > 
> > 'LLLCSP$\
> > 
> > And it is decodable by all existing APRS systems.
> > No real need to come up with incompatible formats 
> > on APRS that existing users cannot decode...
> > 
> > Bob, Wb4APR





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