[aprssig] Path for low(er) altitude balloon

[Robert Bruninga]

>Is the WIDEn-n paradigm now sufficiently 
>implemented that I needn't worryabout losing 
>my payload somewhere down in hick-ville?  

WIDEn-n has been implemented in almost all digis
since 1998.  There are very few WIDE only digis.
A quick check of FINDU.COM shows only two (2)
WIDE only digis in the USA out of 800 digis.

Ah, but there are about 50 of the old PacComm
Trace-only (T) digis that only do WIDE too.  But
these are all clustred in just a few areas.  See my 
fix14439.html web page to see where they are:

http://www.ew.usna.edu/~bruninga/aprs/digis-t.gif

Yes, until these old PacComm ROMS are re-configured
with aliases of WIDE1-1,WIDE2-2,WIDE2-1,WIDE3-3
and re-labeled as "P" overlay digis, this will be an
anoyance.

But look at the map. and plan your flight.
If you will land in an area with many old "T" digis,
then you may use the SINGLE hop path of WIDE.
But do not make it WIDE,WIDE because of the
aformentioned disaster that results.

Bob
will c
Will older
digipeaters (not yet using WIDEn-n) still hear it and digipeat, or will
they
simply ignore it?

This will be a long-jump type of flight and I'd hate to lose contact
with
the payload once it leaves the civilized world...

Thanks.

73,
Robert

>-----Original Message-----
>From: Robert Bruninga [mailto:bruninga at usna.edu] 
>Sent: Monday, May 16, 2005 9:31 AM
>To: Rochte, Robert; aprssig at lists.tapr.org 
>Subject: Re: [aprssig] Path for low(er) altitude balloon
>
>
>For balloons,
>Never ever use RELAY or its new equivalent WIDE1-1.
>Never ever use WIDE,WIDE or anything like it 
>Use the universal WIDE2-2.
>
>You will get one hop at altitude (because every digi
>will have heard it once) and you will get 2 hops
>on the ground when only one digi hears it first.
>
>WIDE2-2 is so much different from WIDE,WIDE,
>because every digi will only digipeat it ONCE.
>Where as WIDE,WIDE would be a nightmare of
>every digi hearing it once, and then 3 or 4 times
>from every other surrounding digi and the result
>is network meltdown as every digi digipeates the
>packet 4 to 5 times each...
>
>This is why the old RELAY and WIDE paths are
>obsolete and we need to phase them out.
>
>Bob
>>>> rrochte at gpacademy.org 5/15/2005 3:40:54 PM >>>
>
>We are planning the flight of a relatively low altitude balloon to
>track air
>masses at the 500mb level (around 18k feet on average).  Given this
>lower
>altitude (at least compared to a stratospheric balloon), I was
>wondering how
>the path should be set - WIDE or WIDE2-2 or RELAY,WIDE?  Or something
>else
>entirely?  
>
>(BTW, we're using a Pockettracker, so I'm a little nervous about just
>using
>WIDE given the low power of the unit - RELAY still makes me feel all
>warm
>and fuzzy inside!)
>
>Thanks and 73,
>Robert
>KC8UCH
>
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