Successful high altitude balloon flight using OT+ and OT2M Proto E...
- Last weekend we successfully launched a balloon which climbed to
96,649ft before the balloon burst and the payload capsule returned to
We ordered an OT2m Proto E for the balloon, and noticed early in
testing that the OT was much a much better choice for decoding
incoming packet traffic than the "Soundcard + AGWPE Packet Engine
Pro". We bought an OT+ with the hopes that we could decide packets
using that hardware. It turned out not to offer that functionality,
so we changed the plan and put the OT+ in the balloon and the OT2m
Proto E on the ground tracking station.
We wrote some custom software to generate a dynamic KML file that
plotted the balloon position reported via Internet, the balloon
position reported via the last direct-received packet, and the tracker
current position in Google Earth, along with driving directions from
the tracker to the payload.
The OT+ never reported either the system voltage or the temperature
correctly. It reported 2.5V when battery voltage was 12.6V. It
reported between -190 and -201C on the temp. We checked and believe
the LM335 temp sensor was functioning correctly. Early in the testing
process we set a jumper wrong on the OT+ and blew the 5V regulator.
This might also have caused the uC to become damaged, although it
still functioned otherwise. This also killed a Garmin GPS18 GPS.
The OT2m Proto E didn't report the correct supply voltage in the data
stream, but it did report the correct temp (within a range correctable
using the download config software). It reported 9.5V when the
battery voltage was 12.6V. I spoke to Scott and be believes that this
is because of a wrong resistor value on the OT2m Proto E.
Thanks to the balloon not lifting as much mass as it said it could,
the balloon rose very slowly until about 30,000ft where it took off
like a rocket. Flight duration was about 7 hours, and we received
every packet sent on our home APRS tower, a distance of about 75
miles, using a 3W Yaesu VX-2R and a hand made "Double Bazooka"
antenna. We got reports from Arkansas, Louisiana, Tennessee and
Ontario Canada that our packets were being received and decoded.
Payload was located about 75miles Northwest of the launch site, at the
bottom of a canyon stuck in a 50ft tree. Payload was recovered after
we contacted the owner and borrowed an axe.
Bryan A. Thompson
- On 9/28/07, Bryan A. Thompson <yahooforward@...> wrote:
> Last weekend we successfully launched a balloon which climbed toNice site... I have to spend a little time going through it more.
> 96,649ft before the balloon burst and the payload capsule returned to
When the page came up, I thought I recognized that black of space... I
scrolled down enough to see Lake Sullivan, and confirmed my
Have you checked with Tony about getting permission to use the image
from SABLE? I'm sure he will give permission, but it would be good to
let him know you are using it. He would also be interested in looking
through your site and learning about your experiences.
I have sent a copy of this email to Tony.
Tony just did an interview for Discovery.ca which aired last night.
He's getting to be an old hand at these TV interviews!