Amateur Extra › E9 Antennas and Transmission Lines › E9A07
E9A07
What is the effective isotropic radiated power (EIRP) of a repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain?
Pick an answer to check it.
Answer: B. 252 watts
Net gain = 7 - 2 - 2.8 - 1.2 = +1 dB. EIRP = 200 W x 10^(1/10) = 200 x 1.259 = about 252 W.
Tip: Net +1 dB is about 1.26 times.