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[aprssig] USA Map of new n-N paradigm

Robert Bruninga bruninga at usna.edu
Thu Dec 23 14:50:36 UTC 2004


Thanks,
Excellent feedback.

I hope the add-on ALOHA algorithm for UIview includes
the multiplication of packets by the number of digipeaters
involved.  Meaning, if there are 6 digipeaters in your
ALOHA circle, then those stations that are equally that
far out should have each of their packets multipled by
SIX in the total count, because that is the number of
packets that result...

thanks
Bob

>>> lcerney at viawest.net 12/20/04 6:29:08 PM >>>
Hi Bob, et al;

Are there any cities in those vast Plains States that are being
overloaded by WIDEn-N and will want to firewall WIDEn-N just 
around their cities but leave it WIDEn-N the rest of the state?
Denver comes to mind. 
[Larry Cerney] I just did some checking and it appears that we must
have one
of the best APRS environments in the country.  I ran two programs I
have to
sniff out what's happening in APRS around me.  The first I ran was
Lee's
fine UI-ALOHA add-on.  It shows my ALOHA circle to be 320 miles.  That
covers ALL of Colorado and parts of KS, OK, TX, NM, AZ, UT, WY, SD, and
NE.
There are many holes in the coverage to be sure, but the Wides we have
here,
and there are only a handful on the Front Range of the Rockies, are
great.
Most are on mountaintops above 10,000 feet.  West of the Divide we may
have
another 12 to 15 Wides also on mountaintops covering the rest of the
state.
The 60 stations that UI-ALOHA used in its calculations included about
10
stations with the farthest station being 515 miles away that added 147
packets to the count.  We do get QRM from stations outside the area and
I do
pay attention to them.  I sent a gentleman in Lubbuck, TX a letter
referring
him to your "How to fix Digipeating" and suggesting that his digi
didn't
need Wide7-7. 

The second program I ran was APRSNetSpy, by Rick, N0KKZ, which analyzes
and
counts packets heard in the area.  I ran it a couple of days ago and
was
seeing only 15 to 20 packets a minute, far below the 60 that would
choke an
APRS network. 

But remember, that once we stop the HIGH POPULATION
areas from using WIDEn-N, then those packets wont get
to you, so once they are cut-off by a firewall, 
[Larry Cerney] With the APRS environment such as it is here in Denver,
Colorado I don't see a need for "Firewalling" around the cities.  Maybe
some
day in the future, but WIDEn-N seems to be working just fine.
then the vast plains might be able to support WIDEn-N just fine?

Bob

[Larry Cerney] 73.....
Larry
K0ANI in Beautiful Denver Colorado





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