What is the effective radiated power (ERP) of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain?
Explanation
Work in decibels first: the antenna gain minus the two losses gives 7 dBd − 2 dB − 2.2 dB = +2.8 dB net. Multiplying the 150 W transmitter output by 102.8/10 = 1.905 gives about 286 watts.