Canadian Basic pool, section 6-09

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Subelement 6

Feedlines and Antenna Systems

Section 6-09

gain, directivity, radiation pattern, antenna bandwidth

6-09-01

What is a parasitic beam antenna?

A.
An antenna where the driven element obtains its radio energy by induction or radiation from director elements
B.
An antenna where all elements are driven by direct connection to the feed line
Correct Answer
C.
An antenna where some elements obtain their radio energy by induction or radiation from a driven element
D.
An antenna where wave traps are used to magnetically couple the elements

6-09-01

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6-09-02

How can the bandwidth of a parasitic beam antenna be increased?

A.
Use traps on the elements
Correct Answer
B.
Use larger diameter elements
C.
Use tapered-diameter elements
D.
Use closer element spacing

6-09-02

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6-09-03

If a slightly shorter parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern?

A.
A major lobe will develop in the horizontal plane, parallel to the two elements
Correct Answer
B.
A major lobe will develop in the horizontal plane, toward the parasitic element
C.
A major lobe will develop in the vertical plane, away from the ground
D.
The radiation pattern will not be affected

6-09-03

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6-09-04

If a slightly longer parasitic element is placed 0.1 wavelength away from an HF dipole antenna, what effect will this have on the antenna's radiation pattern?

A.
A major lobe will develop in the horizontal plane, parallel to the two elements
B.
A major lobe will develop in the vertical plane, away from the ground
Correct Answer
C.
A major lobe will develop in the horizontal plane, away from the parasitic element, toward the dipole
D.
The radiation pattern will not be affected

6-09-04

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6-09-05

The property of an antenna, which defines the range of frequencies to which it will respond, is called its:

Correct Answer
A.
bandwidth
B.
front-to-back ratio
C.
impedance
D.
polarization

6-09-05

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6-09-06

Approximately how much gain does a half-wave dipole have over an isotropic radiator?

A.
1.5 dB
B.
3.0 dB
C.
6.0 dB
Correct Answer
D.
2.1 dB

6-09-06

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6-09-07

What is meant by antenna gain?

A.
The numerical ratio of the signal in the forward direction to the signal in the back direction
B.
The numerical ratio of the amount of power radiated by an antenna compared to the transmitter output power
C.
The final amplifier gain minus the transmission line losses
Correct Answer
D.
The numerical ratio relating the radiated signal strength of an antenna to that of another antenna

6-09-07

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6-09-08

What is meant by antenna bandwidth?

A.
Antenna length divided by the number of elements
B.
The angle between the half- power radiation points
C.
The angle formed between two imaginary lines drawn through the ends of the elements
Correct Answer
D.
The frequency range over which the antenna may be expected to perform well

6-09-08

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6-09-09

In free space, what is the radiation characteristic of a half-wave dipole?

Correct Answer
A.
Minimum radiation from the ends, maximum broadside
B.
Maximum radiation from the ends, minimum broadside
C.
Omnidirectional
D.
Maximum radiation at 45 degrees to the plane of the antenna

6-09-09

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6-09-10

The gain of an antenna, especially on VHF and above, is quoted in dBi. The "i" in this expression stands for:

Correct Answer
A.
isotropic
B.
ideal
C.
ionosphere
D.
interpolated

6-09-10

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6-09-11

The front-to-back ratio of a beam antenna is:

A.
the forward power of the major lobe to the power in the backward direction both being measured at the 3 dB points
Correct Answer
B.
the ratio of the maximum forward power in the major lobe to the maximum backward power radiation
C.
undefined
D.
the ratio of the forward power at the 3 dB points to the power radiated in the backward direction

6-09-11

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