Extra Class

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?

Which frequency band has the smallest first Fresnel zone?

What is antenna efficiency?

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

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

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

What is the 3 dB beamwidth of the antenna radiation pattern shown in Figure E9-1?

What is the front-to-back ratio of the antenna radiation pattern shown in Figure E9-1?

What is the front-to-side ratio of the antenna radiation pattern shown in Figure E9-1?

What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?

What type of antenna pattern is shown in Figure E9-2?

What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

What is the difference in radiated power between a lossless antenna with gain and an isotropic radiator driven by the same power?

What is the far field of an antenna?

What type of analysis is commonly used for modeling antennas?

What is the principle of a Method of Moments analysis?

What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?