Equivalent Isotropically Radiated Power. The power radiated by a radio transmitter including gain from the antenna. For example, an antenna with 3 dB gain concentrates the power in a particular direction such that twice as much power is transmitted in the concentrated direction. So if the total power transmitted is one watt then the EIRP is two watts. The regulator for a particular piece of spectrum will limit the EIRP because that figure gives a better indication of the possibility of interference from a transmitter.
equivalent isotropically radiated power
Effective Isotropic Radiated Power
The Effective Isotropic Radiated Power (EIRP) of a transmitter (uplink) is the power that the transmitter appears to have if the transmitter was an isotropic radiator, i.e., if it radiated equally in all directions. By virtue of the Gain of a radio antenna, dish, radio telescope or optical telescope, a beam is formed that preferentially transmits ...Found on http://www.coseti.org/glossary.htm
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