[aprssig] Hiking with APRS at low risk

Scott Miller scott at opentrac.org
Wed Nov 28 12:28:03 EST 2007

I think there are plenty of applications where a transmit-only tracker 
is just fine.  I haven't done a ton of hiking with a tracker, but when I 
have it's only been with a transmit-only unit and I never had any 
particular need to see other stations.

I sell what I believe is the only low-cost receive-capable APRS tracker 
kit, and I'd be surprised if even half of the users are using the 
receive capability.

One thing I don't think Jason mentioned is that the frequency is 
programmable per profile, and the next firmware release (due out in the 
next week or so) will have at least two frequencies per profile, with 
the ability to switch between them at specified intervals.  So for 
something like a high-altitude balloon, you can have it transmit on 
144.39 once every 30 or 60 seconds, but still get beacons on an 
alternate frequency every 5 or 10 seconds without overloading the network.


Bill Vodall WA7NWP wrote:
>> one tracker with built-in GPS and 2 meter transmitter.
>> I have already had several hikers email me about
>> buying these for this reason.  When they becom
>> > > I often hike with my D7...
> With a tracker they can find the body -- with a D7 you can see how far
> it is to nearest coffee shop..   I'll go with the D7.
> Bill - WA7NWP
> PS.  I was good and didn't even mention the many drawbacks of a
> transmit only tracker...
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