[karc] Re: Queens High Alt Balloon Project - web page update
- From: Phil Somers <pwsomers@xxxxxxxx>
- To: karc@xxxxxxxxxxxxx
- Date: Sat, 5 Apr 2008 08:44:56 -0700 (PDT)
Hello Chip and all,
There was lots of discussion at breakfast about the balloon. Les came up with a
good possible explanation about a couple of the tracking mysteries. The GPS is
designed to not work above 20 km. It either gives garbage readings or a fixed
reading of the last position as it ascended through 20 km. But the APRS
transponder keeps sending that position. So it may appear that the balloon is
stationary at the position it passed 20 km. When it descends through 20 km, it
will start giving positions again, assuming everything else is ok. So it may
have descended below 20 km north of Alexandria Bay, NY and then went back up
and kept transmitting the position where it went back up through 20 km, making
it look like it was stationary on the ground. Then when it eventually came down
again, it transmitted its final position.
It is not clear to me what data was being collected via the APRS system,
independent of Queens on-board data. Apparently it was transmitting mostly all
the time. Is that data recorded anywhere in the APRS system? Apparently someone
was recording something? Any details?
... Phil VE3HST
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