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EIRP

Effective Isotropic Radiated Power

The ACMA had previously defined two EIRP limits in the 2.4 GHz ISM 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.

For 802.11/802.11b applications, this means Channels 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)

EIRP = 15 + 24 - 3 = 36 dBm

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


Version 8 (current) modified Mon, 07 Mar 2011 23:39:51 +1100 by thogard
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