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[aprssig] NE Illinois Balloon Tracks

Rick Green rtg at aapsc.com
Fri Jul 24 15:22:46 UTC 2009

On Fri, 24 Jul 2009, Jason KG4WSV wrote:

> For these and many other reasons, a multi-hop path is VITAL for
> payload recovery.  Our teams have experienced all of these situations.
   This doesn't follow.  Anywhewre east of the Mississippi, the density of 
igates is such that if you hit even one digi, you're going to make it to 
the aprs-is

> Not all trackers are capable of profile switching, to change a
> multi-hop path for a direct path and back.
   The balloonists need to be elmered in the direction of those trackers 
that do support scripted profile switching...  It sounds like tempers are 
flaring, and arrogance levels are rising on both sides.  As fellow hams, 
we need to work together to find a means to accomplish the task with the 
minimum disruption to other users of the frequency...

> If digis are correctly configured, multi-hop related QRM should be
> minimized since they will all retransmit at the same time, to avoid
> ping-ponging.

   This is another situation where remote QRM would be eliminated if my 
proposal for limiting digi's to a geographical 'service area' were 
adopted.  I believe that a digi should be filtered so that it will digi 
only packets which originated within its defined 'service area', no matter 
what path was requested.  Put the onus on the local resident digi owner to 
know the local network, Igate situation, geography, and traffic levels to 
define an appropriate 'service area'.  The transient traveler, trucker, 
balloon, etc. can't be expected to learn the local situation quickly 
enough to respond appropriately.

Rick Green, N8BJX

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
                                   -Benjamin Franklin

"As for our common defense, we reject as false the choice between our
safety and our ideals."
                                -President Barack Obama 20 Jan 2009

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