Canadian Basic pool, section 6-11

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Subelement 6

Feedlines and Antenna Systems

Section 6-11

Yagi antennas - types, dimensions, characteristics

6-11-01

How many directly driven elements do most Yagi antennas have?

A.
None
B.
Two
C.
Three
Correct Answer
D.
One

6-11-01

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6-11-02

Approximately how long is the driven element of a Yagi antenna for 14.0 MHz?

A.
5.21 metres (17 feet)
B.
10.67 metres (35 feet)
C.
20.12 metres (66 feet)
Correct Answer
D.
10.21 metres (33 feet and 6 inches)

6-11-02

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6-11-03

Approximately how long is the director element of a Yagi antenna for 21.1 MHz?

A.
5.18 metres (17 feet)
Correct Answer
B.
6.4 metres (21 feet)
C.
3.2 metres (10.5 feet)
D.
12.8 metres (42 feet)

6-11-03

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6-11-04

Approximately how long is the reflector element of a Yagi antenna for 28.1 MHz?

A.
4.88 metres (16 feet)
Correct Answer
B.
5.33 metres (17.5 feet)
C.
10.67 metres (35 feet)
D.
2.66 metres (8.75 feet)

6-11-04

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6-11-05

What is one effect of increasing the boom length and adding directors to a Yagi antenna?

A.
SWR increases
B.
Weight decreases
C.
Wind load decreases
Correct Answer
D.
Gain increases

6-11-05

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6-11-06

What are some advantages of a Yagi with wide element spacing?

Correct Answer
A.
High gain, less critical tuning and wider bandwidth
B.
High gain, lower loss and a low SWR
C.
High front-to-back ratio and lower input resistance
D.
Shorter boom length, lower weight and wind resistance

6-11-06

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6-11-07

Why is a Yagi antenna often used for radiocommunications on the 20-metre band?

A.
It provides excellent omnidirectional coverage in the horizontal plane
B.
It is smaller, less expensive and easier to erect than a dipole or vertical antenna
C.
It provides the highest possible angle of radiation for the HF bands
Correct Answer
D.
It helps reduce interference from other stations off to the side or behind

6-11-07

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6-11-08

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

A.
The relative position of the driven element with respect to the reflectors and directors
Correct Answer
B.
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
C.
The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction
D.
The number of directors versus the number of reflectors

6-11-08

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6-11-09

What is a good way to get maximum performance from a Yagi antenna?

Correct Answer
A.
Optimize the lengths and spacing of the elements
B.
Use RG-58 feed line
C.
Use a reactance bridge to measure the antenna performance from each direction around the antenna
D.
Avoid using towers higher than 9 metres (30 feet) above the ground

6-11-09

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6-11-10

The spacing between the elements on a three-element Yagi antenna, representing the best overall choice, is _______ of a wavelength.

A.
0.15
B.
0.5
C.
0.75
Correct Answer
D.
0.2

6-11-10

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6-11-11

If the forward gain of a six- element Yagi is about 10 dB, what would the gain of two of these antennas be if they were "stacked"?

A.
7 dB
Correct Answer
B.
13 dB
C.
20 dB
D.
10 dB

6-11-11

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