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[aprssig] Coverage in the National Parks

Robert Bruninga bruninga at usna.edu
Thu Apr 7 13:58:39 UTC 2005


>>> jdw at eng.uah.edu 4/7/05 9:38:54 AM >>>
>Maybe it's for when the packet hits a WIDEn-n capable 
>first instead of  a deprecated RELAY and does some 
>good that way?

Bingo!  Yes, that was the problem with the old RELAY,WIDEn-N
path for the last many years.  It works perfectly when the
only digi it hits is the initial RELAY.  But all the other 95%
of the time that that mobile is driving around and IS in
good digi coverage, he is being heard by many RELAYS
at the same time (all digis also support RELAY) and so his
single packet generates from 2 to 5 dupes at EVERY digi
that hears him.  This is what has been killing APRS reliability
in many areas for many years...

and what we are solving by changing RELAY,WIDEn-N to
WIDE1-1,WIDEn-N...  works exactly the same way, but
does not have the 2 to 5 dupes for every packet.

Bob, Wb4APR





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