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E9A - Antennas and Transmission Lines

Extra Class

Basic antenna parameters: radiation resistance, efficiency, directivity, gain

12 questions

All E0A E1A E1B E1C E1D E1E E1F E2A E2B E2C E2D E2E E3A E3B E3C E4A E4B E4C E4D E4E E5A E5B E5C E5D E6A E6B E6C E6D E6E E6F E7A E7B E7C E7D E7E E7F E7G E7H E8A E8B E8C E8D E9A E9B E9C E9D E9E E9F E9G E9H

E9A01

What is an isotropic radiator?

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?

E9A03

What term describing total radiated power takes into account all gains and losses?

E9A04

Which of the following factors affect the feed point impedance of an antenna?

E9A05

What does the term “ground gain” mean?

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?

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?

E9A08

Which frequency band has the smallest first Fresnel zone?

E9A09

What is antenna efficiency?

E9A10

Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

E9A11

Which of the following determines ground losses for a ground-mounted vertical antenna operating on HF?

E9A12

How much gain does an antenna have compared to a half-wavelength dipole if it has 6 dB gain over an isotropic radiator?