G9C01:

Which of the following would increase the bandwidth of a Yagi antenna?

1. Larger-diameter elements
2. Closer element spacing
3. Loading coils in series with the element
4. Tapered-diameter elements

G9C02:

What is the approximate length of the driven element of a Yagi antenna?

1. 1/4 wavelength
2. 1/2 wavelength
3. 3/4 wavelength
4. 1 wavelength

G9C03:

How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?

1. The reflector is longer, and the director is shorter
2. The reflector is shorter, and the director is longer
3. They are all the same length
4. Relative length depends on the frequency of operation

G9C04:

How does antenna gain stated in dBi compare to gain stated in dBd for the same antenna?

1. dBi gain figures are 2.15 dB lower than dBd gain figures
2. dBi gain figures are 2.15 dB higher than dBd gain figures
3. dBi gain figures are the same as the square root of dBd gain figures multiplied by 2.15
4. dBi gain figures are the reciprocal of dBd gain figures + 2.15 dB

G9C05:

How does increasing boom length and adding directors affect a Yagi antenna?

1. Gain increases
2. Beamwidth increases
3. Front-to-back ratio decreases
4. Front-to-side ratio decreases

G9C06:

What configuration of the loops of a two-element quad antenna must be used for the antenna to operate as a beam antenna, assuming one of the elements is used as a reflector?

1. The driven element must be fed with a balun transformer
2. There must be an open circuit in the driven element at the point opposite the feed point
3. The reflector element must be approximately 5 percent shorter than the driven element
4. The reflector element must be approximately 5 percent longer than the driven element

G9C07:

What does "front-to-back ratio" mean in reference to a Yagi antenna?

1. The number of directors versus the number of reflectors
2. The relative position of the driven element with respect to the reflectors and directors
3. The power radiated in the major radiation lobe compared to that in the opposite direction
4. The ratio of forward gain to dipole gain

G9C08:

What is meant by the "main lobe" of a directive antenna?

1. The magnitude of the maximum vertical angle of radiation
2. The point of maximum current in a radiating antenna element
3. The maximum voltage standing wave point on a radiating element
4. The direction of maximum radiated field strength from the antenna

G9C09:

How does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?

1. Approximately 1.5 dB higher
2. Approximately 3 dB higher
3. Approximately 6 dB higher
4. Approximately 9 dB higher

G9C10:

Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?

1. The physical length of the boom
2. The number of elements on the boom
3. The spacing of each element along the boom
4. All these choices are correct

G9C11:

Which HF antenna would be the best to use for minimizing interference?

1. A quarter-wave vertical antenna
2. An isotropic antenna
3. A directional antenna
4. An omnidirectional antenna

G9C12:

Which of the following is an advantage of using a gamma match with a Yagi antenna?

1. It does not require that the driven element be insulated from the boom
2. It does not require any inductors or capacitors
3. It is useful for matching multiband antennas
4. All these choices are correct

G9C13:

Approximately how long is each side of the driven element of a quad antenna?

1. 1/4 wavelength
2. 1/2 wavelength
3. 3/4 wavelength
4. 1 wavelength

G9C14:

How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi antenna?

1. About the same
2. About 2/3 as much
3. About 1.5 times as much
4. About twice as much

G9C15:

What is meant by the terms dBi and dBd when referring to antenna gain?

1. dBi refers to an isotropic antenna, dBd refers to a dipole antenna
2. dBi refers to an ionospheric reflecting antenna, dBd refers to a dissipative antenna
3. dBi refers to an inverted-vee antenna, dBd refers to a downward reflecting antenna
4. dBi refers to an isometric antenna, dBd refers to a discone antenna

G9C16:

What is a beta or hairpin match?

1. It is a shorted transmission line stub placed at the feed point of a Yagi antenna to provide impedance matching
2. It is a 1/4 wavelength section of 75 ohm coax in series with the feed point of a Yagi to provide impedance matching
3. It is a series capacitor selected to cancel the inductive reactance of a folded dipole antenna
4. It is a section of 300 ohm twinlead used to match a folded dipole antenna