Yeah, that's been my problem with this idea. For units that put out the
Z velocity maybe it'd be more useful, but I'm not certain. Years ago I
started work on a GPS-based variometer for my paraglider but dropped it
when there was too much altitude variation. I never tried the Z
velocity since it's not a standard output.
Another possibility (that's actually used by varios) is a barometric
pressure sensor. I've got a good supply of those on hand for the
ADS-WS1 weather stations, and if the noise can be filtered out it might
work.
It occurs to me that you could also add a mode to send a packet when
something is heard from a digipeater - subject to a minimum interval and
with a randomized hold-off. That way you might be more likely to hit a
digi while coming around the side of a hill facing the right direction,
and not just on the top.
Scott
Lynn W. Deffenbaugh (Mr) wrote:
>
>
> Before you actually do this, you might want to monitor the altitude
> output on your GPS while sitting still. I've watched various ones of
> mine and they float around by +/- 50 feet routinely. I can see it when
> I drive up over the causeway bridge (the highest point around), but I
> can be driving down the flat road and the altitude is floating up and
> down as if I were in rolling hills.
>
> Maybe it works better in truly hilly or mountainous regions?
>
> Lynn (D) - KJ4ERJ - 30' above sea level in Palm Bay, FL
>
> Pete Lilja wrote:
> >
> >
> > I was driving in Southern Iowa and Northern Missouri over the weekend
> > with my T2-135 connected to a Nuvi 350. I got quite good coverage
> > throughout the weekend. I have Smart Beaconing set and active as I
> > travel yet it occurred to me during the trip that it is only triggered
> > by time or a turn and that often doesn't happen while on top of a hill
> > when the added elevation would give better / more distant APRS coverage.
> >
> > That leads me to wonder if, first, it is possible to wrtie a script
> > for the T2 to detect when the mobile has made an elevation increase to
> > truigger a position beacon sent. My thinking is that the script would
> > monitor elevation changes and when the unit began to descend a packet
> > would be sent. This would, of course, miss the peak altitude but may
> > still send a beacon when you're close to being at the top of a hill.
> >
> > I don't remember seeing this in the Smart Beaconing set-up but maybe
> > there is a way to do it there?
> >
> > Thanks,
> >
> > Pete
> > KC0GPB
>
>
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