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EIRP
Effective Isotropic Radiated PowerThe 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 LossOR
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.
The following companies should be contacted if you which to break the law and they have offered their advice on exceeding the legal limits here and in other countries.
Buy ThesisVersion 7 (old) modified Mon, 26 Jul 2021 12:49:29 +0000 by thogard
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