For the 915 MHz radiated power measurements an external whip antenna (P/N: ANT-915-CW-HWR-SMA) was used as a transmitterantenna. It was connected to the SMA connector of the EFR32MG Radio Board. The supply for the radio (RFVDD) was 1.8 V providedby the on-chip DC-DC converter, the supply for the sub-GHz power amplifier (SUBGRF_ON, SUBGRF_OP) was 3.3 V provided by theMotherboard (VBIAS through the discrete balun; for details, see the schematic of the BRD4164A). The transceiver was operated incontinuous carrier transmission mode. The output power of the radio was set to 19 dBm.