On the bench: FrSky R9 long-range RC system

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I lift the skirts of the FrSky R9M, R9 and R9 Slim 900MHz long-range RC system for RC planes and drones. In this review I examine the quality and performance of this module-based system and in a future review I will compare it to the TBS Crossfire.
This is the datasheet for the Semtech SX1279 LoRa chip used in this system:
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