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

kb2scs at optonline.net kb2scs at optonline.net
Sun Sep 9 00:19:24 UTC 2007


Hi Keith
n-N 
        The relationship between n-N is 
Back when WIDEn-N first came out stations would set up their path
using the same number for n as N.
For example:

WIDE5-5

Their packet would go out into the APRS world and be digipeated 5 times
Yes it would get digied a lot more than 5 times. But for this 
discussion we will keep this linear.

As each digi digipeated the packet it would deincrement the N. In this 
case the second 5.

The packet would travel a great distance and end when the N was 
decrimented to 0. Which would look like this at the last hop.
WIDE5.

Now receiving stations would know that this packet traveled 5 hops,
Yes we are still talking linear.

So put simply the n is just to let receiving stations know how many 
hops it took the packet to reach them.

Now with the new paradigm the n really has no meaning any more.
you could send packets wide7-2 which would be the same as 
WIDE2-2. You would get 2 hops in both cases.

Hope this helped.

On 8 Sep 2007 at 19:36, Keith Stevenson wrote:

> 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.
Snip
Let us hope we never witness the "Silence Of The Hams"
73 DE John  KB2SCS
       E-Mail:            kb2scs at arrl.net
       APRS-SCS     http://www.tapr.org/~kb2scs
       Web Page:     http://www.qsl.net/kb2scs




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