Amateur ExtraE9A03
What term describing total radiated power takes into account all gains and losses?
C
Answer
Antennas and transmission lines
Type
A
Power factor
B
Half-power bandwidth
C
Effective radiated power
D
Apparent power
Answer Notes
Effective Radiated Power (ERP) is the standard term used to describe the total actual power radiated by an antenna in its direction of maximum gain. It is calculated by taking the transmitter's output power, subtracting any losses in the transmission line and hardware, and adding the directional gain of the antenna (relative to a dipole).
This calculation provides a true picture of how strong the signal will be in the real world. Distractors like 'Apparent power' and 'Power factor' are alternating current (AC) electrical circuit terms, not RF radiation terms. 'Half-power bandwidth' refers to a range of frequencies, not a measurement of power output.
Previous · E9A02
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?
Next · E9A04
Which of the following factors affect the feed point impedance of an antenna?