Few facts about SEMTECH SX1276 LoRa modem and 20dBm (100mW) mode:
- +20dBm (100mW) is possible only on PA_BOOST pin
- Pins RFO_LF and RFO_HF allows only up to +17dBm (50mW)
- Maximum allowed duty cycle while using +20dBm mode is 1%
- Maximum allowed VSWR while using +20dBm mode is 3:1
The biggest problem with +20dBm on PA_BOOST is allowed 1% duty cycle. On the other hand, +17dBm mode (50mW) does not have such a limitation and maximum range should be only 1.42 times shorter than in 100mW mode.