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Effective Isotropic Radiated Power

The ACMA [1] had previously defined two EIRP [2] limits in the 2.4
GHz ISM [3] band, but has revised the rules now into one limit.

Between the ranges of 2400 MHz to 2483.5 MHz, the limit is a maximum
of 4 W (watts) EIRP [4].

For 802.11 [5]/802.11b [6] applications, this means Channels [7] 1
through 13 have a maximum limit of 4 watts EIRP

EIRP CALCULATION

EIRP = Tx power x Antenna Gain / Feedline Loss

OR

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

e.g. 30 mW WLAN card into a 24 dBi dish with 3dB coax and connector
loss

30 mW = 15 dBm (from PowerAndGainToDecibels [8])

EIRP = 15 + 24 - 3 = 36 dBm

This system is right on the legal limit of +36dBm (4W) EIRP.

Links:
------
[1] http://melbournewireless.org.au/?ACMA
[2] http://melbournewireless.org.au/?EIRP
[3] http://melbournewireless.org.au/?ISM
[4] http://melbournewireless.org.au/?EIRP
[5] http://melbournewireless.org.au/?802.11
[6] http://melbournewireless.org.au/?802.11b
[7] http://melbournewireless.org.au/?Channels
[8] http://melbournewireless.org.au/?PowerAndGainToDecibels

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