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Docs Power & Battery E22 Power Levels

E22 Power Levels

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The E22 module's transmit power options, the current each level draws, and the legal mapping of each setting.

E22 Power Levels

The E22 modules (especially the “30S” variants) can transmit far beyond what the license-free band allows. Knowing the power ladder, and where the legal ceiling sits, is the whole game.

The power ladder

Setting (dBm)Output (mW)Current during TX
+1010 mW~60 - 80 mA
+1320 mW~75 - 95 mA
+1750 mW~90 - 110 mA
+20100 mW~100 - 120 mA
+22160 mW~110 - 140 mA

The license-free ISM ceiling for general operation is 10 mW ERP (see ERP vs EIRP). With antenna gain, even +10 dBm at the module can exceed the ERP ceiling: the honest mapping is:

SettingLegal status (unlicensed)
+10 dBmThe legal floor for routine beaconing
+13 to +22Emergency use only, or amateur-licensed operation

The Regulatory Compliance page states this in full, and the Emergency Use Legal page explains the emergency boundary.

The battery cost

Each power step up adds current draw, and the TX burst is the beacon’s biggest load (see Current Draw by Mode). The power setting is a battery decision as much as a legal one: +10 saves roughly 30% of the TX energy versus +17.

The field trade

Lower power costs range. For routine beaconing the legal floor is the default; for a genuine emergency the beacon’s EMERGENCY mode raises the power (see Mode Emergency). The receiver side matters too: Antenna Height Matters often gains more than the power steps.