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E9A09:What is antenna efficiency?

E9A09E9A

What is antenna efficiency?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E9A09 is Radiation resistance divided by total resistance.

The key fact is Radiation resistance divided by total resistance. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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More questions in E9A

E9A01What is an isotropic radiator?E9A02What 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?E9A03What term describing total radiated power takes into account all gains and losses?E9A04Which of the following factors affect the feed point impedance of an antenna?E9A05What does the term “ground gain” mean?E9A06What 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?