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The MRF24J40MC/MD/ME modules contain an external power amplifier & low noise amplifier that has to be enabled manually by setting three bits in the TESTMODE register. On MRF24J40MC the power amplifier is powered by a separate voltage regualtor that has to be enabled by setting GPIO3 to HIGH. During Sleep and CCA the PA should be disabled. Co-authored-by: Carton <joel.carron@eeproperty.ch> Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>