What is an isotropic antenna?

- A grounded antenna used to measure Earth conductivity
- A horizontally polarized antenna used to compare Yagi antennas
- A theoretical, omnidirectional antenna used as a reference for antenna gain
- A spacecraft antenna used to direct signals toward Earth

What is the effective radiated power relative to a dipole 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?

What is the radiation resistance of an antenna?

- The combined losses of the antenna elements and feed line
- The specific impedance of the antenna
- The value of a resistance that would dissipate the same amount of power as that radiated from an antenna
- The resistance in the atmosphere that an antenna must overcome to be able to radiate a signal

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

- Transmission line length
- Antenna height
- The settings of an antenna tuner at the transmitter
- The input power level

What is included in the total resistance of an antenna system?

- Radiation resistance plus space impedance
- Radiation resistance plus transmission resistance
- Transmission-line resistance plus radiation resistance
- Radiation resistance plus loss resistance

What is the effective radiated power relative to a dipole 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?

What is the effective isotropic radiated power 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?

What is antenna bandwidth?

- Antenna length divided by the number of elements
- The frequency range over which an antenna satisfies a performance requirement
- The angle between the half-power radiation points
- The angle formed between two imaginary lines drawn through the element ends

What is antenna efficiency?

- Radiation resistance divided by transmission resistance
- Radiation resistance divided by total resistance
- Total resistance divided by radiation resistance
- Effective radiated power divided by transmitter output

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

- Installing a radial system
- Isolating the coax shield from ground
- Shortening the radiating element
- All these choices are correct

Which of the following factors determines ground losses for a ground-mounted vertical antenna operating in the 3 MHz to 30 MHz range?

How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?

What term describes station output, taking into account all gains and losses?