In electromagnetic transmission systems, particularly those dealing with telecommunications, effective radiated power or equivalent radiated power (ERP) is a standardized theoretical measurement of radio frequency (RF) energy using the SI unit watts, and is determined by subtracting system losses and adding system gains. ERP takes into considerati...
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http://en.wikipedia.org/wiki/Effective_radiated_power
the power required at the input of a lossless reference antenna to produce, in a given direction at any specified distance, the same power flux density as that radiated by a given device NOTE - For the ITU and in Chapter 712, the term 'effective radiated power' without qualification is used only when the reference antenna is a half-wave dipole.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=161-04-16
the product of the power supplied to an antenna and the relative gain of the antenna in a given direction, with respect to a half-wave dipole NOTE - The use of the concept of equivalent isotropically radiated power is to be preferred to that of effective radiated power.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=712-02-52
the product of the power supplied by a radio transmitter to an antenna and the gain of this antenna relative to a half-wave dipole in a given direction
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Effective radiated power (ERP) A measurement of the output of RFID reader antennas used in Europe and elsewhere. ERP is usually expressed in watts and is not the same as EIRP.
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