[OZAPRS] Strange APRS packets

Damien Gardner Jnr vk2tdg at gmail.com
Mon Dec 26 19:40:48 EST 2011

I'm guessing that you're referring to the 'duplicate position packet'
messages?  You didn't actually say what the 'strange behaviour' actually was
That would appear to be a problem upstream from .au, as it's *not* appearing
on the second.aprs.net.au data stream..  Check out
http://hamtrack.pinegap.net/stationdump.php?stationid=42434 for your raw
packet dump for the last 24 hours - you'll see that there were no duplicates
in there, so any 'duplicates' that aprs.fi may have seen, were in the global
network, not .au..


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of David Hopkins
Sent: Monday, 26 December 2011 2:15 PM
To: ozaprs at aprs.net.au
Subject: [OZAPRS] Strange APRS packets

Anyone else noticed strange behavior on the APRS system here,

Have a look at the raw packets on VK4zf-9 on aprs.fi At first I thoughht
there was something wrong with the setup in this car.

However if you look at vk4zf-7, it has the same problem.This is a completely
different car and radio.
I have noticed it also on other mobiles.

If you watch the tracks on aprs.fi the positions are all over the place.

What is going on?


David G. Hopkins (VK4ZF)
27.32.38S 153.12.03E
Skype :- davhop 

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