Maybe you can avoid COCOM limits: Vaisala radiosondes (the most used
type here in Europe, see www.vaisala.com) include "half" GPS receiver
on it and the other "half" is in the ground tracking program. The
balloons go up to about 30 Km and while the speed is very low this
height is above the limit. Maybe you can get a recovered sonde and use
it either directly or modulating its telemetry on your radio. The
receiving program SondeMonitor is licensed to amateurs by a small fee
and can be downloaded free for evaluation.
Ignacio, EB4APL
On 07/06/2012 5:35, Robert Watzlavick.com wrote:
Onboard gps units tend to drop out at high altitude and/or high velocities due
to COCOM limits. Some will re-acquire at apogee but it doesn't always work.
I'm planning for onboard telemetry but a multilateration system is the backup.
I correspond with others on aRocket and unrestricted gps units still aren't
available to the average person without a lot of paperwork and $$$.
-Bob
On Jun 6, 2012, at 22:13, Chris Albertson<[email protected]> wrote:
Why not fly a tiny GPS inside the rocket? Either modulated the beacon with
the GPS serial data or record it to a micro SD card.
On Wed, Jun 6, 2012 at 7:33 PM, Robert Watzlavick<[email protected]>wrote:
Sorry to resurrect an old thread but I also have a question about using
the Thunderbolt in the future. I'm considering using 4 of them in a
multilateration setup to track an amateur rocket with an onboard beacon.
Chris Albertson
Redondo Beach, California
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