[aprssig] Anyone use GPS module as alt to full GPS unit ?
archer at eskimo.com
Mon Mar 14 12:23:42 CST 2005
On Mon, 14 Mar 2005 maiko at pcs.mb.ca wrote:
> Does anyone recommend a good 'GPS module + Tracker' circuit
> as a lower cost alternative to buying a full blown GPS unit ?
> It would be nice to go and by a GPS module and connect it
> into a tiny tracker or TNC for marathon work. I've seen some
> kits and modules available, for example Jupiter series out
> of the UK, and I'm sure there are more.
> I've never tried this, but I'm looking for cost effective
> alternatives here.
Try a PocketTracker mated with a GPS. Any kind of puck-type or
board-level GPS will still need an addition battery/power-supply to
run it. It might be better to just use a cheap handheld GPS that
has its own internal batteries. That way you only have a 9V battery
in the PocketTracker and a couple of AA's in the GPS.
That package only has two physical units and one cord to deal with.
Gives you 2-meter transmitter, TinyTrack 3a TNC, and a GPS.
Everything you need for an event tracker. 270mW out, but it appears
to get out better than the wattage would have you believe.
I've taken a TinyTrack-II board and put on a TO-220 regulator
instead of the TO-92 package, then ran a Trimble SV6 board off of
that power supply. That way the TT-II and GPS could run off the
same battery, but I still had to integrate a radio into the package.
It also needed a single-transistor inverter circuit between the GPS
and the TT-II. I think the TT-III may have alleviated that need by
allowing you to use an inverted GPS input directly.
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
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