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Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

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T9A-2014: Antennas: vertical and horizontal polarization; concept of gain; common portable and mobile antennas; relationships between antenna length and frequency

T9A01-2014: What is a beam antenna?

An antenna that concentrates signals in one direction

An antenna built from aluminum I-beams

An omnidirectional antenna invented by Clarence Beam

An antenna that reverses the phase of received signals

T9A02-2014: Which of the following is true regarding vertical antennas?

The electric field is perpendicular to the Earth

The magnetic field is perpendicular to the Earth

The phase is inverted

The phase is reversed

T9A03-2014: Which of the following describes a simple dipole mounted so the conductor is parallel to the Earth's surface?

A horizontally polarized antenna

A ground wave antenna

A rhombic antenna

A vertically polarized antenna

T9A04-2014: What is a disadvantage of the “rubber duck” antenna supplied with most handheld radio transceivers?

It does not transmit or receive as effectively as a full-sized antenna

It transmits a circularly polarized signal

If the rubber end cap is lost it will unravel very quickly

All of these choices are correct

T9A05-2014: How would you change a dipole antenna to make it resonant on a higher frequency?

Shorten it

Lengthen it

Insert coils in series with radiating wires

Add capacitive loading to the ends of the radiating wires

T9A06-2014: What type of antennas are the quad, Yagi, and dish?

Directional antennas

Non-resonant antennas

Loop antennas

Isotropic antennas

T9A07-2014: What is a good reason not to use a “rubber duck” antenna inside your car?

Signals can be significantly weaker than when it is outside of the vehicle

It might cause your radio to overheat

The SWR might decrease, decreasing the signal strength

All of these choices are correct

T9A08-2014: What is the approximate length, in inches, of a quarter-wavelength vertical antenna for 146 MHz?





T9A09-2014: What is the approximate length, in inches, of a 6 meter 1/2-wavelength wire dipole antenna?





T9A10-2014: In which direction is the radiation strongest from a half-wave dipole antenna in free space?

Broadside to the antenna

Equally in all directions

Off the ends of the antenna

In the direction of the feed line

T9A11-2014: What is meant by the gain of an antenna?

The increase in signal strength in a specified direction when compared to a reference antenna

The additional power that is added to the transmitter power

The additional power that is lost in the antenna when transmitting on a higher frequency

The increase in impedance on receive or transmit compared to a reference antenna

T9A12-2014: What is a reason to use a properly mounted 5/8 wavelength antenna for VHF or UHF mobile service?

It offers a lower angle of radiation and more gain than a 1/4 wavelength antenna and usually provides improved coverage

It features a very high angle of radiation and is better for communicating via a repeater

The 5/8 wavelength antenna completely eliminates distortion caused by reflected signals

The 5/8 wavelength antenna offers a 10-times power gain over a 1/4 wavelength design

T9A13-2014: Why are VHF or UHF mobile antennas often mounted in the center of the vehicle roof?

A roof mounted antenna normally provides the most uniform radiation pattern

Roof mounts have the lowest possible SWR of any mounting configuration

Only roof mounting can guarantee a vertically polarized signal

Roof mounted antennas are always the easiest to install

T9A14-2014: Which of the following terms describes a type of loading when referring to an antenna?

Inserting an inductor in the radiating portion of the antenna to make it electrically longer

Inserting a resistor in the radiating portion of the antenna to make it resonant

Installing a spring at the base of the antenna to absorb the effects of collisions with other objects

Making the antenna heavier so it will resist wind effects when in motion

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T8D-2014: Non-voice communications: image signals; digital modes; CW; packet; PSK31; APRS; error detection and correction; NTSC
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Technician Class Exam Question Pool
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T9B-2014: Feed lines: types of feed lines; attenuation vs. frequency; SWR concepts; matching; weather protection; choosing RF connectors and feed lines
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