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[aprssig] WRAP-UP MISSOULA MARATHON APRS SUPPORT

Herb Gerhardt hgerhardt at wavecable.com
Tue Jul 10 18:36:27 UTC 2012


You folks must think outside the box.  Every place is a unique location.
Right now within 20 miles of Missoula  there are a total of 8 APRS stations
on my map and only two digipeaters, so transmitting at 30 sec is fine and
dandy FOR THIS LOCATION, it won't saturate the APRS network.

Our recommended path settings are for the entire US and local paths which
transmit more often are just fine in some areas.  These areas not only have
few users, they have very few digipeaters or home stations that will digi
the WIDE1-1 path, so only a few transmissions will hit a digi.  More often
might be better in some remote areas of our country.......

Also keep in mind that special events and Search and Rescue missions have
priority over normal local usage.  These are usually of a short duration and
for SAR, a life might be at stake, so more often transmissions to make sure
you are being heard, are justified.


Herb, KB7UVC
NW APRS Group, West Sound Coordinator
Our WEB Site:  http://www.nwaprs.info



> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of
> Brett Friermood
> Sent: Tuesday, July 10, 2012 10:01 AM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] WRAP-UP MISSOULA MARATHON APRS SUPPORT
> 
> > I count 7 trackers going at 30 second rate which is really pushing the
> > Aloha limit on a 1200 baud channel with digipeats. You may have lost a
> > lot of packets due to collisions...
> 
> What was the reasoning for 30 second transmit rates?
> 
> At a far off world record pace of 15 mph that is 1/4 mile traveled per
minute, which
> equates to the many times on this list recommended minimum beacon rate.
Ded
> reckoning will easily handle that even on an extremely curvy course.
> 
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