RF power limits for 2.4ghz Wifi gear

The ACA has set a limit Between the ranges of 2400 MHz to 2483.5 MHz, the limit is a maximum of 4 W (watts) EIRP.

EIRP calculation

EIRP = Tx (dBm) + Antenna Gain (dB) - Feedline Loss (dB)

30 mW = 15 dBm (see math below)

EIRP = 15dBm + 24dBi - 3dB = 36 dBm This system is right on the legal limit of +36dBm (4W) EIRP.

**mwatts to DBM (where input is
100mw)**

100 Log X 10 = 20 dbm

20

**DBM to mwatts (where 20 is 20dbm**

10 x^y ((20 - 30)/10 ) = 100mw