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General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G9D: Specialized antennas

2015-G9D01: What does the term NVIS mean as related to antennas?

Near Vertical Incidence sky-wave

Nearly Vertical Inductance System

Non-Varying Indicated SWR

Non-Varying Impedance Smoothing



2015-G9D02: Which of the following is an advantage of an NVIS antenna?

High vertical angle radiation for working stations within a radius of a few hundred kilometers

Low vertical angle radiation for working stations out to ranges of several thousand kilometers

High forward gain

All of these choices are correct



2015-G9D03: At what height above ground is an NVIS antenna typically installed?

Between 1/10 and 1/4 wavelength

As close to 1/2 wavelength as possible

As close to one wavelength as possible

Height is not critical as long as it is significantly more than 1/2 wavelength



2015-G9D04: What is the primary purpose of antenna traps?

To permit multiband operation

To notch spurious frequencies

To provide balanced feed point impedance

To prevent out of band operation



2015-G9D05: What is an advantage of vertical stacking of horizontally polarized Yagi antennas?

It narrows the main lobe in elevation

It allows quick selection of vertical or horizontal polarization

It allows simultaneous vertical and horizontal polarization

It narrows the main lobe in azimuth



2015-G9D06: Which of the following is an advantage of a log periodic antenna?

Wide bandwidth

Higher gain per element than a Yagi antenna

Harmonic suppression

Polarization diversity



2015-G9D07: Which of the following describes a log periodic antenna?

Length and spacing of the elements increase logarithmically from one end of the boom to the other

Impedance varies periodically as a function of frequency

Gain varies logarithmically as a function of frequency

SWR varies periodically as a function of boom length



2015-G9D08: Why is a Beverage antenna not used for transmitting?

It has high losses compared to other types of antennas

Its impedance is too low for effective matching

It has poor directivity

All of these choices are correct



2015-G9D09: Which of the following is an application for a Beverage antenna?

Directional receiving for low HF bands

Directional transmitting for low HF bands

Portable direction finding at higher HF frequencies

Portable direction finding at lower HF frequencies



2015-G9D10: Which of the following describes a Beverage antenna?

A very long and low directional receiving antenna

A vertical antenna

A broad-band mobile antenna

A helical antenna for space reception



2015-G9D11: Which of the following is a disadvantage of multiband antennas?

They have poor harmonic rejection

They present low impedance on all design frequencies

They must be used with an antenna tuner

They must be fed with open wire line





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