You need a Spektrum surface radio system.
It works by sending the data on the return communication channel that the Spektrum surface DSM radios have. You need a Spektrum surface transmitter, a telemetry capable receiver (SR3000 or SR3100T), and a display (either in the DX3S transmitter or the SPM1300/1305 hand-held). It works nicely within its range (about 300').
I HAVE used it in an airplane by flying with a SR3100T receiver as a "passenger" (just to transmit the data back to me). The actual flight controls were on a regular DX7 with my DX3R just sitting on the bench turned on, and the handheld in my pocket. It had slightly better range that way and was useful for checking out performance of motor/prop setups.
Andy
Spektrum Development Team
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