Re: [amsat-bb] Cal Poly balloon flight

[Gerard.Auvray@xxxxxxxxxx]

I don't know about the SONY GPS but in France we  flown recently a balloon
with a Fastrak GPS (http://www.fastrax.fi/).
With the first version of sofware, the GPS stoped data transmissions above
18 000 meters, but data came back when the balloon was going back under 18
000 meters.
Fastrax has updated the Software and now the GPS should work above 18 000
meters. A new flight test is shecdule for April 2004.

Web site with balloon lauch recently. ( Sorry it's in franch but lot of
pictures)
http://www.amsat-france.org/ballon25102003/
http://www.amsat-france.org/ludion/index.htm
http://www.ref-union.org/ed60/ballon.html


Gerard / F6FAO





Cliff Buttschardt <cbuttsch@kcbx.net>@AMSAT.Org on 19/01/2004 22:46:55

Please respond to cbuttsch@kcbx.net

Sent by:    owner-AMSAT-BB@AMSAT.Org


To:    AMSAT-bb@AMSAT.Org
cc:
Subject:    [amsat-bb] Cal Poly balloon flight


Last Saturday, Cal Poly had a most successful balloon flight which reached
an
altitude of 87600 feet!  Aboard were two GPS units with downlinks on APRS.
Many
of you saw N6CP-11 packets where many of us directly under the balloon did
not.
Thanks for the cooperation getting data back to us.
     One of the GPS units was specified for altitudes above 50000 feet and
worked
just fine.  The other GPS unit, a SONY consumer grade chipset was aboard
with the
specific task of indicating what the failure mode above 50K might be.  No
data
was obtained as the Tiny Track failed.  Is there any information available
on this
subject?  Does the unit regain ability below 50K feet?  One goal of this
launch
was to determine just this information!  Fortunately the other GPS allowed
the
recovery team to locate the package within 15 minutes of touchdown!  Cliff
K7RR
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