This configuration applies to Revision 1, build codes QFAA-B00, CAAA-B00.
Symptoms
When transmitting with an external RF front-end module (FEM) or power amplifier (PA), the power emitted in the 5-25 MHz frequency range might exceed regolatory limits.
Conditions
The device is operating with an external FEM or PA.
Consequences
The end product might fail regulatory conformance test.
Workaround
In Bluetooth and Nordic proprietary modes, use RADIO:TXPOWER lower than 4 dBm in the device.
In all modes, apply the following code before enabling the RADIO:
(volatile uint32_t *)(((uint32_t)NRF_RADIO) + 0x8C4) = 0x01280001ul;