The transmission power must be configured to fit country-specific regulation in Configuration ⇒ Tx configuration ⇒ Tx configuration menu.

The maximum transmission power can be expressed in EIRP (Equivalent Isotropically Radiated Power) or ERP (Effective Radiated Power).

• EIRP is the radiated output power referenced to an isotropic antenna radiating power equally in all directions and whose gain is expressed in dBi.
• ERP is referenced to a half-wave dipole antenna whose gain is expressed in dBm ⇒ ERP = EIRP - 2.15 dB.

In the gateway configuration page, the maximum Tx power is set in dBm (EIRP). For information, theoretical ERP is also available.

The antenna gain needs to be configured. When sending Tx messages the gateway will take into account this gain to respect the maximum emitted power. The LoRa antennas provided with the Wirnet gateways are 3 dBi or 6 dBi antennas. The insertion loss (due to cable for example) must be configured.

If an end-device is close to the Wirnet gateway, it is recommended to decrease the Tx power to avoid saturation and desensitization of the LoRa receiver.