What is an isotropic antenna?

  1. A grounded antenna used to measure Earth conductivity
  2. A horizontally polarized antenna used to compare Yagi antennas
  3. A theoretical, omnidirectional antenna used as a reference for antenna gain
  4. 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?

  1. 1977 watts
  2. 78.7 watts
  3. 420 watts
  4. 286 watts


What is the radiation resistance of an antenna?

  1. The combined losses of the antenna elements and feed line
  2. The specific impedance of the antenna
  3. The value of a resistance that would dissipate the same amount of power as that radiated from an antenna
  4. 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?

  1. Transmission line length
  2. Antenna height
  3. The settings of an antenna tuner at the transmitter
  4. The input power level


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

  1. Radiation resistance plus space impedance
  2. Radiation resistance plus transmission resistance
  3. Transmission-line resistance plus radiation resistance
  4. 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?

  1. 317 watts
  2. 2000 watts
  3. 126 watts
  4. 300 watts


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?

  1. 159 watts
  2. 252 watts
  3. 632 watts
  4. 63.2 watts


What is antenna bandwidth?

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


What is antenna efficiency?

  1. Radiation resistance divided by transmission resistance
  2. Radiation resistance divided by total resistance
  3. Total resistance divided by radiation resistance
  4. Effective radiated power divided by transmitter output


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

  1. Installing a radial system
  2. Isolating the coax shield from ground
  3. Shortening the radiating element
  4. 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?

  1. The standing wave ratio
  2. Distance from the transmitter
  3. Soil conductivity
  4. Take-off angle


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

  1. 3.85 dB
  2. 6.0 dB
  3. 8.15 dB
  4. 2.79 dB


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

  1. Power factor
  2. Half-power bandwidth
  3. Effective radiated power
  4. Apparent power