[aprssig] Use of XXX devices for APRS

Gregg Wonderly gregg at wonderly.org
Tue May 3 13:25:03 EDT 2011

Alternate frequency discussion here reminded me of a discussion I wanted to have 
about how we might proceed with allowing alternate emissions, modes, spectrum, 
non-amateur spectrum devices participate in the network.  One of the things that 
is predominately on my mind is the fact that 144.390mhz at 1200baud just can't 
handle infinite traffic.  The growth of the mobile device marketplace and 
available APRS software authoring will allow a lot more participation on the 
network, if we can figure out how to manage traffic flow from these devices to 
RF when it is from licensed users.

Authenticating the source of the traffic always pops to the top of the list of 
things that we need to manage.  I have software and devices that can use APRS-IS 
just fine, but I can't have a conversation or be visible to RF only users 
without outbound i-Gate traffic.  I can of course talk about this with a local 
i-Gate owner, or setup my own i-Gate to do this locally.  But, when I am away 
from my home area, I will have issues getting to RF.

So, I'm wondering what others have been thinking about this.  I can, for example 
put a small computing device with a wifi->serial path (WiSnap for example) in 
front of a TNC-Radio "unit" and have a path to RF.  But, what else can we do to 
help manage the convenience of using various devices in concert with getting 
APRS to work as it should on the RF side?

Gregg Wonderly

On 5/2/2011 7:17 AM, ml41782 wrote:
> Bob,
> Just a Note on the use of 144.990
> In the Mid-atlantic Repeater Council (T-MARC) 144.990 is a repeater frequency.
> You have to go above that for another digital Frequency i.e. 145.010
>> Message: 1
>> Date: Sun, 1 May 2011 10:32:27 -0400 (EDT)
>> From: "Bob Bruninga " <bruninga at usna.edu <mailto:bruninga at usna.edu>>
>> Subject: [aprssig] Use of the 144.99 alt-input channel
>> To: aprssig at tapr.org <mailto:aprssig at tapr.org>
>> Message-ID: <201105011432.020522 at msan1.usna.edu
>> <mailto:201105011432.020522 at msan1.usna.edu>>
>> Content-Type: text/plain; charset=us-ascii
>> A few thoughts on the proper use of 144.39 +600 alternate input channel:
>> We were planning on using the 144.39 +600 input channel for our special event in
>> the Maryland Mountains so that our system can hear the weak signals from the 5W
>> walkie-talkies along the 40 mile trail on 7 May.

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