We are using the same cardboard and plywood altimeter bay as last year
and have had absolutely no problems until now. We removed the battery
for about 2 minutes and took a 10 minute walk outside the hotel where
there is a clear view to the sky. Operating in flight mode under the
table tab, we saw nothing in the GPS sat column for the 10 minute test
we ran. Hmmmmm.
-Dan
On 4/17/2013 3:31 PM, Bdale Garbee wrote:
Keith Packard <[email protected]> writes:
Take a look at the 'table' view in AltosUI -- that'll give details on
precisely which sats you're seeing and what kind of C/N0 numbers they're
showing.
I test the GPS functionality on every board we sell, so I've watched the
acquisition and lock process progress probably more than any other
person on our products.
Every once in a great while, I see a GPS chip that kind of gets
"stuck". If you haven't achieved lock within a half hour or so, I'd
definitely suggest disconnecting the battery for a couple minutes and
then trying again. Even if you power-cycle the board, if the battery is
connected the GPS chip's ephemeris information is retained.
Disconnecting the battery forces a true "cold start" to occur.
I live in the woods, and the weather doesn't always support going
outside to test things. As a result, attaining lock with any GPS
receiver can be "interesting" at times. But, my experience has been
that if I have at least one satellite with a C/N0 number above 35, the
board is fine and will lock ok at a launch site where you tend to have a
nearly hemispherical clear view of the sky.
Bdale
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