<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000099">
On 17/02/2012 8:21 AM, <a class="moz-txt-link-abbreviated"
href="mailto:ozaprs-request@aprs.net.au">ozaprs-request@aprs.net.au</a>
wrote:
<blockquote cite="mid:mailman.9.1329429078.898.ozaprs@aprs.net.au"
type="cite">
<pre wrap="">Message: 1
Date: Thu, 16 Feb 2012 19:46:28 +1100
From: "Nic McLean" <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:mcleannb@bigpond.com"><mcleannb@bigpond.com></a>
To: <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:ozaprs@aprs.net.au"><ozaprs@aprs.net.au></a>
Subject: [OZAPRS] No recent positions on Googlemaps.
Message-ID: <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:000001ccec87$7bb3e8f0$731bbad0$@bigpond.com"><000001ccec87$7bb3e8f0$731bbad0$@bigpond.com></a>
Content-Type: text/plain; charset="us-ascii"
Hi,
Does anyone on the list know why aprs positions aren't making it from RF to
googlemaps?
Best 73's
Nic
VK5ZAT</pre>
</blockquote>
G'day Nic,<br>
<br>
Additional to what Tony has already offered, there can be other
reasons why we sometimes won't be seen on APRS servers,<br>
<br>
1) The path you set for your packets may not be "sufficient" to
survive the number of hops needed to make it to an Igate. Check up
that you have this correctly according to the published
recommendations.<br>
<br>
2) Congestion on the frequency can be a real issue in my observation
/ experience, especially if there are a large number of (fixed)
stations transmitting information. I am sometimes quite surprised
at how much of this there is - at least from my QTH. In the midst
of all of this your beacons may simply be swamped by some of this
traffic especially if, as a mobile station running (probably) lower
power and the constraints of mobile antennas, you are competing with
all the advantages of base stations in locations with a large
spread. The 'hidden transmitter" issue present right from the early
days of packet radio is nearly always with us. Throw in random
geographical barriers and it all becomes a game of chance. <br>
<br>
I know in my own travels it's not uncommon to be "un-noticed" by the
system in my trips around this area if I haven't turned my own
digipeater on - even when one might expect otherwise. I only
run 5 watts in the car and I know that sometimes I can drive for 25
or 30 minutes through locations where one would expect to 'make it'
and miss out altogether until I come within the range of my own or
some other digi where I acquire a certain RF priority. <br>
<br>
As Tony says, given all of these challenges, it's amazing that the
system works as well as it does.<br>
<br>
73<br>
Terry <br>
<br>
</body>
</html>