[aprssig] Hiking with APRS at low risk
Bill Vodall WA7NWP
wa7nwp at gmail.com
Thu Nov 29 13:04:52 CST 2007
On Nov 28, 2007 5:28 PM, Scott Miller <scott at opentrac.org> wrote:
> I think there are plenty of applications where a transmit-only tracker
> is just fine.
Me too -- but not on 144.39 with a transmitter power capable of
hitting multiple digis. Even worse is that there's no attempt to
mitigate the issues with alternate technologies like time slicing. I
think the OT does it but not the TT?
> 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.
> > 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
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