Peter Richens prichens at iinet.net.au
Fri Sep 26 01:22:23 EST 2014


Part of the problem for someone like me.. as an example..
I have not had anything to do with this in the past but want to find out
more.. problem is there seems to be little in the way of good guides that
don't conflict with someone else's version of the guide and I am still in
the dark as to what to use this for apart from tracking my vehicle.. I have
also loaded the app on my Android phone and while it's fun to play with I am
still a little miffed as to what the real world application for this is.. 
I have been a Licensed Amateur since around 1986 and had my full licence
since 1988, have played with Packet Radio for years until I moved to
Brisbane and life just got too hectic then the internet basically took over
and sending packets at 1200baud just seemed so painful.. 

I want to get my teeth into something and this among options available
seemed like a fun thing to play with but how far do I go with it and how do
I actually progress..

I did read something about a system being used for disaster communications
and seen to think this may have been it, something to do with knowing what
resources are around.. if that is the case how do we use it for that.. 

I am quite certain that this is not puzzling for just me, the VK2 Guy that
is beaconing.. well that could just have been me as I think mine is doing
something similar, even though I thought it had been set to only beacon when
moved.. actually on that it would be nice if it beaconed more regularly
sometimes.. or maybe not!

Then comes HF or rather long distance travel such as my recent trip to Cape
York, I am more than certain that there are not that many VHF stations up
that way except for Cairns and maybe Cooktown.. 

Peter Richens - VK4FSD
River City 4WD Club - Past President 2010 - 2014
Sent from my Thumping huge Laptop

-----Original Message-----
From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Justin Albury
Sent: Thursday, 25 September 2014 9:54 PM
To: Australian APRS Users
Subject: Re: [OZAPRS] MICE usage

So to remove a few of these issues we have done a new config and alignment
of a replacement VK2RHR-1 digi as a "hot swap" .... this will be more of a
fill digi rather than it current config.

As soon as I get a chance I will visit Highrange and do the swap.

Will keep you posted


Justin Albury
J Albury Communications
justin at jacomms.com

-----Original Message-----
From: OZAPRS [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Owen Duffy
Sent: Thursday, 25 September 2014 6:01 PM
To: Australian APRS Users
Subject: Re: [OZAPRS] MICE usage

Hello All,

Some thoughts on the issue:

I think the real issue here is the failure of source routing, whether you
give it some grand name like "New N Pardigm" or not.

There are numerous examples that demonstrate that you cannot depend on hams,
whether they operate end stations or 'infrastructure' (digis,
iGates) to "do the right thing'.

Hams doing what they want as individuals were responsible for the demise of
the old 'packet network' before its time, and the same problem occurs with

So, if you drive outside Sydney or Melbourne for your annual holidays, and
you set your path for WIDE1-1,WIDE2-2, what is wrong with that?

Well the issue is that the optimal path is not a property of the mobile, but
its location. In some places, a single hop is sufficient to have a high
probability of iGate submission, in others, three hops might only moderate
probability of iGate submission.

Then there are the  effects of band openings (most mornings and evenings in
summer) where three hops may well get you from Sydney to Melbourne.

A possible solution is intelligent network infrastructure that controls
packet routing, and limits the lifetime of packets. It could also be used to
block misguided stations operating outside of reasonable parameters on the
shared radio channel.

That means finding a flexible routing platform for digis, especially
strategic digis that could be used to segment the network into local areas
as congestion dictates. Such a platform needs to be highly interoperable,
there is no room for a digi that does not decode some popular trackers (eg
the incompatibility between OT3 and Foxtrack/TT1).

Sydney is a most interesting case study, it has essentially no 'local'
digi and depends on three digis 40-60km out, and most packets that originate
or enter the area are repeated by all three digis so increasing channel
utilisation which in turn reduces the effectiveness of the network for
position reporting of mobile stations.

A filtering dig in each of the three locations to block traffic flow from
north to south, and south to north could be very effective in reducing
channel utilisation whilst still support high rate of iGate submission.

The role of High Range and Mt Murray, both W2 digis located with 40km of
each other deserve review as under the "New N Pardigm", almost all packets
originating in Sydney and the Illawarra carried by one will be carried also
by the other.

At the same time, coverage of half of the M7 is patchier than a lot of major
highways outside of Sydney.

I think it is the infrastructure that deserves attention rather that trying
to educate end users.



OZAPRS mailing list
OZAPRS at aprs.net.au
OZAPRS mailing list
OZAPRS at aprs.net.au

More information about the OZAPRS mailing list