[aprssig] Re: OLD vs NEW

[Stephen H. Smith]

kb7tbt at gmail.com wrote:
> I have a question that maybe some of you would say is simply silly but 
> I need
> it answered, so lets see if you all can teach a old dog a new trick.
>
> As far as I understand the reasoning for the new WIDEn-n is to prevent 
> the
> abuse and packet flooding by ignorant 7-7's and so fourth.
>

Part of the new n-N is to trap abusive paths like WIDE7-7.  

The other part is address the fact that KPC3 TNCs  (used in a very large 
percentage of all U.S. digipeaters) don't do dupe suppression on "RELAY" 
or plain "WIDE" paths, but do on any kind of n-N path. 


> Now I have seen all this chatter about 1-1 and 1-2 and how digi's dont
> understand it, my question is simply "why?"
>

The WIDE1-1 path is a replacement for the now-obsolute "RELAY" (which 
KPC3s won't dupe supress) for home low-level fill-in digis.

> For years now I have simply used WIDE2-2 on all my paths, 3 or 4 years 
> ago I
> went across country with the same path and it worked just fine with the
> exception of the "dead" areas at the time.
>

By doing that you are depending solely on high-level wide-coverage "true 
WIDEn-Ns" only,  and are bypassing the possible help from low-level home 
fill-in digis.  In the west where WIDEn-N digis are  *REALLY*  wide on 
mountains thousands of feet above the user,  this works well. 

In the flat lands of the midwest and east coast where "true WIDEn-Ns" 
are typically only a few hundred feet above the user, the assistance of 
home stations via WIDE1-1 can make a major difference. 


WIDE1-1 is compatible with either:  a home station as the first hop, 
--or-- a true high-level WIDEn-N as the first hop.  [ The home station 
is typically too stupid to properly decrement WIDE2-2 properly to 
WIDE2-1.  Instead it would mark it as used, preventing any further digi 
hops.  ]

By using two WIDEn-N statements in series,  a "dumb" home station can 
"eat" the first WIDE1-1 while leaving the following WIDE2-2 (or WIDE2-1) 
part for subsequent true WIDEn-N digis to process normally. 


> So as I see it old or new setups should still accept the wide2-2 path, in
> our state that is the basic recommended path other then AZ2-2 but of 
> course
> that's special to the state.
>

The whole history and rationale behind the new scheme is here on my website:
     "APRS 101"  Explanation of APRS Path Selection & Digipeating
     http://webs.lanset.com/wa8lmf/DigiPaths







Stephen H. Smith    wa8lmf (at) aol.com
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