[aprssig] New-N paradigm and LOCALINFO Freq Objects

Stephen H. Smith wa8lmf2 at aol.com
Tue Sep 24 15:59:27 CDT 2013


On 9/24/2013 4:11 PM, Robert Bruninga wrote:
>> ... [maybe]a directed path rather than WIDE2-1.
>> >For example, you might advertise 146.94-RI
>> >with a path of VERMLN to specifically target users
>> >north of the repeater...
> Seems like a good idea on the surface... BUT... While this may satisfy the
> need to inform users in the VERMLN area, it violates three principles of
> the LOCALINFO paradigm.
>
> 1) It uses a hop, meaning it will blindly collide with  users in the
> VERMLN area because the digi (nor VERMLN) that is sourcing this packet
> into the network CANNOT HEAR ALL THE USERS of VERMLN.  Hence the network
> suffers reliability.  Hence the rule, only source these at the digi
> direct.


So HOW DO you reconcile this with the fact that, in the vast open 
thinly-populated expanses of the US and Canadian great plains and prairies, the 
voice repeater will probably have 2-3 times the range of the co-located 
digipeater if you don't let surrounding digis also announce it.

In densely populated coastal areas (especially where rolling hills force a 
limit on voice coverage well before you are out of the range of the co-located 
digipeater) no hops makes sense.   However, in the low-density environment of 
the plains, where the digi is virtually guaranteed to "run out of coverage" 
long before the voice repeater, 1 WIDE2-1 hop outward from the co-located digi 
makes sense.

_______________________________________________________

--

Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:   14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net


  Long-Range APRS on 30 Meters HF
     http://wa8lmf.net/aprs/HF_APRS_Notes.htm

High Performance Sound Systems for Soundcard Apps
    http://wa8lmf.net/ham/imic.htm
    http://wa8lmf.net/ham/uca202.htm

"APRS 101"  Explanation of APRS Path Selection & Digipeating
   http://wa8lmf.net/DigiPaths





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