[aprssig] Thinking Out Loud About... Digipeaters

Robert Bruninga bruninga at usna.edu
Thu Jul 23 12:53:55 CDT 2009

Plese consider using the TEMPn-N network for temporary systems.
The value is that every D700 in the country can be
pre-configured to support TEMPn-N digipeating and be left in
this configuration ALWAYS.  Thus, a TEMPn-N network can be built
as fast as the D700's arrive on site.  always available without
causing any problems to the exsisting network the other 99.9% of
the time. 

See www.aprs.org/TEMPn-N.html

Spread the word.  EVERY D700 should set this in his radio when
he gets around to it...

> -----Original Message-----
> From: aprssig-bounces at tapr.org 
> [mailto:aprssig-bounces at tapr.org] On Behalf Of Tom Hayward
> Sent: Thursday, July 23, 2009 1:16 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Thinking Out Loud About... Digipeaters
> I think the best temporary digipeater configuration for a
> event would be "SAR7-7", as Curt WE7U has hypothesized. This
> was devised so that every Search And Rescue tracker would also
be a
> digipeater, forming a mesh network of many digipeaters. The
> would use a path of WIDE1-1,WIDE2-1,SAR7-7 and be configured
> preemptively digipeat SAR7-7.
> The only tracker that I'm aware of capable of preemptively
> is the Argent Data Systems Tracker2
> (http://www.argentdata.com/products/tracker2.html). Each of
> digipeater stations would need one of these or another capable
> digipeater software such as digi_ned.
> The WIDE1-1,WIDE2-1,SAR7-7 path (SAR is arbitrary, you could
use RACE,
> EVENT, etc.) gets you into the standard APRS network when
> but also allows for many hops in your temporary event
> When every station/tracker is a digipeater, as long as every
mobile is
> in range of at least one other mobile, packets will be
digipeated up
> to 7 times within your temporary infrastructure.
> Curt used to have a webpage that described this better, but I
> able to find it.
> Tom KD7LXL
> On Thu, Jul 23, 2009 at 8:45 AM, Tim
N9PUZ<tim.n9puz at gmail.com> wrote:
> > Our local group here supports a couple of large public 
> service events each
> > year where under normal conditions APRS coverage is poor to 
> non-existent in
> > some areas. We have used it with good success to do vehicle 
> tracking but we
> > would like to start equipping rest stops and check points 
> with full stations
> > so we can do tactical messaging.
> >
> > To date we have added temporary digipeaters in the area and 
> ended up with
> > good coverage. We set them up more like a normal digi and 
> did not use the
> > WIDE1-1 as if they would be fill-ins. We are in rural 
> Illinois so there was
> > not a big metro area being trashed.
> >
> > The temporary digipeaters typically only have antenna 
> heights of 15-30 ft or
> > are in a vehicle left parked on top of a bluff or other 
> high point for the
> > day. The tougher of the two events used 3 of these digis 
> this year and there
> > were still areas that were not covered. Adding more are 
> possible, we just
> > aren't sure of the best way to configure things. These same 
> areas were
> > problematic for voice comms as well--repeater coverage isn't
> >
> > So,... the question becomes would a good configuration be 
> for setting up
> > temporary digipeaters with low antennas? I imagine with the 
> antenna height
> > constraints the temporary would not be any different than 
> if we wanted
> > permanent coverage in this same situation.
> >
> > Thanks,
> >
> > Tim, N9PUZ
> >
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> >
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