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[aprssig] WIDEn-N 'Decay Sequence'

Anders Green anders at pobox.com
Mon Jun 19 14:48:14 UTC 2006


At 10:05 AM 6/19/2006, Mark Earle wrote:
>As Bob will tell you, APRS is a local tactical system. Emphasis on LOCAL.

Yes. My interest lies in exactly that area. When I first
hooked up my D700 and it told me it was getting packets
from 178 miles away, I was like, "Huh?"

>Almost! WIDE2-2 becomes WIDE2-1. If the 2nd number is non-zero then a station hearing the packet digipeats it and decrements the 2nd number.

Got it. Now, what is the purpose of the 'little n'? 
(that is, the 2 that doesn't change in the above
example)


>The other advantage of WIDE1-1,WIDE2-2 is: Some old TNCs at hilltops can't do the fancy repeat and decrement. So those TNCs should act on the WIDE1-1, and give you one hop.

Which brings me to another generic question. I'm guessing
that the set up for the digipeaters is a string like
"RELAY,WIDE,WIDE1-1" (note that I'm not saying that this
is a _recommended_ setup string *grin*) So does the
digipeater just parse the packet, and if it contains
one of those strings, rebroadcast it?

OR, is each of those actually the name of a _setting_ whereby
there are further parameters, like "RELAY" would mean, oh,
'a signal received locally, not from another digipeater,
with a signal strength of x, and a color of blue?'


>So, the idea is, no matter what - the mobile user sets up WIDE1-1, WIDE2-2 and does not have to reconfigure. Useful for other than D700 users, trackers, etc.

And a D700 user should use what? And why would they be
different than any other mobile user? (I have a D700 and
understand that *my* capabilities are significantly 
different than other mobile APRS users, but don't
understand why I would want a different path setting
for packets I transmit.)


>See fix14439.txt   if you google for that it explains things in more detail.

I tried http://www.google.com/search?q=fix14439.txt but got
no hits... typo?

Thanks for the info Mark. :)

Cheers,
Anders



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