E9C01:

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

  1. Cardioid
  2. Omni-directional
  3. A figure-8 broadside to the axis of the array
  4. A figure-8 oriented along the axis of the array

E9C02:

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

  1. Cardioid
  2. A figure-8 end-fire along the axis of the array
  3. A figure-8 broadside to the axis of the array
  4. Omni-directional

E9C03:

What is the radiation pattern of two 1/4 wavelength vertical antennas spaced a 1/2 wavelength apart and fed in phase?

  1. Omni-directional
  2. Cardioid
  3. A Figure-8 broadside to the axis of the array
  4. A Figure-8 end-fire along the axis of the array

E9C04:

What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?

  1. The lobes become more perpendicular to the wire
  2. The lobes align more in the direction of the wire
  3. The vertical angle increases
  4. The front-to-back ratio decreases

E9C05:

What is an OCFD antenna?

  1. A dipole feed approximately 1/3 the way from one end with a 4:1 balun to provide multiband operation
  2. A remotely tunable dipole antenna using orthogonally controlled frequency diversity
  3. An eight band dipole antenna using octophase filters
  4. A multiband dipole antenna using one-way circular polarization for frequency diversity

E9C06:

What is the effect of a terminating resistor on a rhombic antenna?

  1. It reflects the standing waves on the antenna elements back to the transmitter
  2. It changes the radiation pattern from bidirectional to unidirectional
  3. It changes the radiation pattern from horizontal to vertical polarization
  4. It decreases the ground loss

E9C07:

What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?

  1. 300 ohms
  2. 72 ohms
  3. 50 ohms
  4. 450 ohms

E9C08:

What is a folded dipole antenna?

  1. A dipole one-quarter wavelength long
  2. A type of ground-plane antenna
  3. A dipole consisting of one wavelength of wire forming a very thin loop
  4. A dipole configured to provide forward gain

E9C09:

What is a G5RV antenna?

  1. A multi-band dipole antenna fed with coax and a balun through a selected length of open wire transmission line
  2. A multi-band trap antenna
  3. A phased array antenna consisting of multiple loops
  4. A wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun

E9C10:

Which of the following describes a Zepp antenna?

  1. A dipole constructed from zip cord
  2. An end fed dipole antenna
  3. An omni-directional antenna commonly used for satellite communications
  4. A vertical array capable of quickly changing the direction of maximum radiation by changing phasing lines

E9C11:

How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus rocky ground?

  1. The low-angle radiation decreases
  2. The high-angle radiation increases
  3. Both the high-angle and low-angle radiation decrease
  4. The low-angle radiation increases

E9C12:

Which of the following describes an extended double Zepp antenna?

  1. A wideband vertical antenna constructed from precisely tapered aluminum tubing
  2. A portable antenna erected using two push support poles
  3. A center fed 1.25 wavelength antenna (two 5/8 wave elements in phase)
  4. An end fed folded dipole antenna

E9C13:

What is the main effect of placing a vertical antenna over an imperfect ground?

  1. It causes increased SWR
  2. It changes the impedance angle of the matching network
  3. It reduces low-angle radiation
  4. It reduces losses in the radiating portion of the antenna

E9C14:

How does the performance of a horizontally polarized antenna mounted on the side of a hill compare with the same antenna mounted on flat ground?

  1. The main lobe takeoff angle increases in the downhill direction
  2. The main lobe takeoff angle decreases in the downhill direction
  3. The horizontal beam width decreases in the downhill direction
  4. The horizontal beam width increases in the uphill direction

E9C15:

How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?

  1. The main lobe takeoff angle increases with increasing height
  2. The main lobe takeoff angle decreases with increasing height
  3. The horizontal beam width increases with height
  4. The horizontal beam width decreases with height