[Space] APRS trackers
adam at tellumo.net
Sun Jan 22 16:29:00 PST 2012
Ladies and gentlemen--
Kindly find below my research on GPS/APRS trackers for Spacebridge.
I'm afraid I don't have as much information on the parameters we
need--I know that at a minimum we should have it track above 60k feet.
(As I understand it, it is required that civilian GPS devices not
track when traveling over BOTH 999 miles/hour AND 60,000 feet AMSL,
but that a distressingly large proportion replace that AND with an OR,
which is yet another part of what makes high-altitude balloonery so
interesting. *This is not legal advice*, and *I am not your,
Noisebridge's, or Spacebridge's lawyer*: http://ianyl.net/TINLA.html ;
Regardless, I wasn't too sure about the weight or power budgets or of
what hardware we had on board or available, so I just looked up
whatever seemed decent. Results follow:
* Proven altitude records: http://www.bigredbee.com/kml_gallery.htm
; some astonishing stuff at http://californianearspaceproject.com/ as
* Includes GPS
* Can use entire 2M band, as well as 70 cm band (but latter is
limited to 16 mW, as opposed to 5 W--need some kind of radio guru to
look at this)
* Supports various voltages
* $275! But includes radio.
Byonics TinyTrak3 (http://www.byonics.com/tinytrak/)
* Only $98 including GPS
* Former successful use: http://www.eoss.org/hardware/k0yuk_aprs.htm .
* Needs external radio
* Can power GPS (5V)
These two seem to pretty much run the market, although there may be
something buried out there that I haven't been able to uncover. Once
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