[time-nuts] Thunderbolt GPS rollover

[EB4APL]

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<albertson.chris at gmail.com>  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<rocket at watzlavick.com>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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