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[aprssig] Fundamental APRS capacity

Robert Bruninga bruninga at usna.edu
Mon Oct 4 13:16:36 UTC 2004


>>> rtg at aapsc.com 10/4/04 7:15:24 AM >>>
>> Here is the algorithm to exactly (in real time) determine what
>> the ALOHA circle range is for any user:
>
>Great explanation, and the algorithm seems reasonable, 
>but you stopped at the most critical point.  How do you 
>use this information to come up with a reasonable path.  
>Should it be 'RELAY, WIDEC-C'?

Ah, that's easy.  Just have your software display the PHG
circles for the digis and then you can see how many hops
it takes to hit the digis or any combination of them.  APRSdos
displays the DIGI ranges in green so they are easy to see.
And recent versions display the ranges of the digis and fill in
the areas in different colors based on the number of hops to 
get to them so all of the  map that is red is direct, what is 
yellow is 1 hop, what is violet is 2 hops etc..
See a screen shot of APRSdos for Wash DC area:

http://www.ew.usna.edu/~bruninga/aprs/digihopsX.gif

This is an instantaneous snapshot based on the packets recently
heard from each digi, so you have to watch this over a period
of time to gather what the average really is...  Just hit the 
MAPS-PLOTS-HOPS key to get this display (in APRSmax.exe).

Being able to view the PHG ranges of the digis and visualize 
the network and the number of hops to get to any station and 
the distinct path to get there  is fundamental to any APRS operations
and now even more-so as we are well beyond saturation.

thanks
de WB4APR, Bob


-- 
Rick Green

"They that can give up essential liberty to obtain a little
 temporary safety, deserve neither liberty nor safety."
                                  -Benjamin Franklin


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