Amateur Extra › E9 Antennas and Transmission Lines › E9A06
E9A06
What is the effective radiated power (ERP) of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
Pick an answer to check it.
Answer: A. 317 watts
Net gain = 10 - 4 - 3.2 - 0.8 = +2 dB. ERP = 200 W x 10^(2/10) = 200 x 1.585 = about 317 W.
Tip: Net +2 dB is about 1.58 times.