I am using a rak811 node with an 3.6 dbi gain antenna, thus with tx_power = 0 I should get 16+3.6=19.6 dBi as output ( ideally, without any losses ).
Trying to comply with EU868 regulations, I set my node at tx_power = 2
The definition of txPower=0 is its max EIRP. See also:
Wouldn’t it be better to “compensate” for the antenna gain inside the device firmware instead of using the txPower for this? That way txPower=0 can still be used.