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[aprssig] DIGIpeater - Network performance

Robert Bruninga bruninga at usna.edu
Fri Jan 26 18:02:01 UTC 2007


I should have also provided this link:
http://www.ew.usna.edu/~bruninga/aprs/mdmapw66.gif

That map showed all the digipeaters we used to hear on RF prior
to the 2004 New-N Paradigm.  We were seeing digis and users over
9 states, all on RF.  Now what I hear on RF is much improved and
covers a much smaller area that is appropriate for the 240 users
we see every day.  QRM is down, reliability is up.  

Compare the above map with the map below and you can clearly see
the difference that the New-N paradigm makes over the 2 years.
And it also appears that we are 90% there.   Bob, WB4APR

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> Subject: [aprssig] DIGIpeater - Network performance
> 
> No one jumped on this sentence buried in some of the earlier
> emails...
> 
> > 1) I live in probably the highest density of APRS and voice
> > repeaters on the planet, over 100 voice repeaters and I just
> > checked 50 digipeaters heard on RF....
> 
> I was frying other fish at the time, but when I noticed this
50
> digipeaters heard on RF in the Baltimore-Washington DC area,
it
> did tweak my interest.  Today, I got back to it and took a
> detail look at this.  
> 
> Turns out, all but 5 of those digis are using the proper 2 hop
> paths and are fully compliant with the New-N paradigm.  Only 1
> was so far out of area as to be due to TROPO.  The others all
> represent how powerful a 2 hop path is on the Eastern
Seaboard.
> Now remember, that a 2 HOP path from a digipeater is similar
to
> a 3 hop path from a user station, since the digi is already at
a
> high site, so we will see digipeaters one tier beyond where we
> should be seeing 2 hop users.  These two images show the digis
> and how many are outside of my ALOHA circle.
> 
> http://www.ew.usna.edu/~bruninga/aprs/DC-digis.GIF
> 
> But since 2 hop users are one tier less than 2 hop digi's,
most
> of the 240 users I hear on RF these days are within my ALOHA
> circle as we hoped:
> 
> http://www.ew.usna.edu/~bruninga/aprs/DC-users.GIF
> 
> Anyway, this is a lot better picture than it used to be, and
> even with all that activity, there is still some quiet time
for
> most mobiles to get in.
> 
> Those areas that are still stuck with RELAY and WIDE
> digiepeaters can look forward to improvements such as we have
> gained here.  See
> http://www.ew.usna.edu/~bruninga/aprs/fix14439.html
> 
> Bob, WB4APR
> 
> 
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