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OT?? Model Rocketry

This may be off topic? I am helping a neighbor who is just getting into 
high power model rocketry (Tripoli) He is interested in _two way_ 
telemetry with his rocket and wants the downlink for the usual sensors 
like altitude, GPS, XYZ-attitude etc. There are _one way_ products that 
provide the downlink but he also wants to be able to uplink to fire 
parachutes or thrusters (during descent). I am leaning toward an 900 MHz 
ISM solution for the RF but am stumped as to what digital platform would 
be most flexible (and light weight) for the communications needs. Are 
there any standards or better yett off the shelf products? I am open to 

Joe Leikhim K4SAT

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P

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