equivalent isotropically radiated power การใช้

• FCC Part 15 in the US . Equivalent isotropically radiated power ( EIRP ) in the European Union is limited to 20 dBm ( 100 mW ).
• "' P e "'is the Equivalent isotropically radiated power ( also known as EIRP ) in dBW . It depends on the output of the transponders of the satellite and the antenna gain of the transmitting antenna.
• In Europe the power limit was expressed as effective radiated power ( ERP ), rather than the more commonly used equivalent isotropically radiated power ( EIRP ), permitting the use of high-gain directional antennas to produce much higher EIRP and hence long ranges.
• It is transmitted as an 80 quadrature phase-shift keyed ( QPSK ) signal on an RF carrier in the 137 MHz-band, with an equivalent isotropically radiated power level that varies between 3.2 dBW ( 2 watts ) and 8.0 dBW ( 6.3 watts ).