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[aprssig] WIDE settings (was A test for APRS in some lessor traveled Western areas)

Keith Stevenson ki4ybq at ki4ybq.net
Sat Sep 8 23:36:33 UTC 2007


Cap,

I think that you may have misunderstood the intent of my question.  I'm
trying to understand how and (more importantly) why the protocol works.
There seems to be some subtleties that if misunderstood can cause grief for
a large number of users.  I've read the new n-N paradigm papers (some of
them several times), and I believe I understand how setting an appropriately
small value of N keeps the traffic local and avoids out of area QRM.  My
frustration stems from the fact that I've been unable to find a discussion
of the relationship between n and N.  I'm looking for a deeper understanding
than "please use this setting to avoid generating QRM."

Also, I am using the example of how one would select the value of n for a
digi as just that, an example.  I find that there is a lot more information
about appropriate settings for end-stations than for the digis and I'm
simply trying to learn.  I have no intention of blindly setting up a digi.
In fact, I have yet to transmit a single APRS packet because I do not yet
feel that I have an adequate understanding of how APRS works.  I'm one of
those obsessives that is compelled to learn as much as possible about a
topic.

73,
Keith Stevenson, KI4YBQ


On 9/8/07, Cap Pennell <cap at cruzio.com> wrote:
>
> You guys could _really_ benefit from _another_ careful read-through of
> http://web.ew.usna.edu/~bruninga/aprs/fix14439.html
> and the links from that page.
>
> Best bet: WIDE1-1,WIDE2-1 mobile; WIDE2-2 (or less) fixed or base.  Three
> (or more) hops in all directions is not the answer for courtesy, nor
> rarely
> much help for vanity.
>
> In remote areas the trick is mostly getting packets from your station into
> _the first_ digi called for in your digipath.  Broader digipaths don't
> help
> there.  Many areas are far less "remote" than a visitor's first impression
> might indicate.  High mountains often have digis on top providing access
> from a vast area.
>
> A fill-in digi only operates packets addressed to WIDE1-1.  The other
> digis
> will operate packets addressed to WIDE1-1 or WIDE2-2 or WIDE2-1 or WIDE3-1
> (while inserting their callsign in the path's "history").  This is the
> "New
> Paradigm", traceable WIDEn-N.  RELAY and WIDE and TRACE and TRACEn-N are
> completely obsolete (pass it on).
>
> Many digis will give only one hop to any WIDE3-N address (that is, WIDE3-3
> or WIDE3-2 or WIDE3-1).  They operate/digipeat the packet while adjusting
> the path so there will be no further hops ("trapping" the excess hops).
> Still, any modern high "S overlay" digi will give WIDE2-1 or WIDE3-1 (or
> WIDE1-1) the same one hop.
>
> Confused about any of this stuff at all?  Then use WIDE1-1,WIDE2-1 mobile;
> WIDE2-2 (or less) fixed or base.  Transmit only as frequently as your
> intended "audience" requires to fulfill their objectives.
>
> (And please don't even consider putting up any new digipeater at all until
> your confusion is all gone and you've had full discussions about the VHF
> network's _needs_ with all the operators of existing digipeaters in your
> network/region).
> 73, Cap KE6AFE
>
>
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