Basic
Subelement 6
Feedlines and Antenna Systems
Section 6-11
Yagi antennas - types, dimensions, characteristics
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Approximately how long is the driven element of a Yagi antenna for 14.0 MHz?
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5.21 metres (17 feet)
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10.67 metres (35 feet)
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20.12 metres (66 feet)
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Correct Answer10.21 metres (33 feet and 6 inches)
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Approximately how long is the director element of a Yagi antenna for 21.1 MHz?
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5.18 metres (17 feet)
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Correct Answer6.4 metres (21 feet)
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3.2 metres (10.5 feet)
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12.8 metres (42 feet)
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Approximately how long is the reflector element of a Yagi antenna for 28.1 MHz?
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4.88 metres (16 feet)
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Correct Answer5.33 metres (17.5 feet)
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10.67 metres (35 feet)
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2.66 metres (8.75 feet)
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What is one effect of increasing the boom length and adding directors to a Yagi antenna?
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SWR increases
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Weight decreases
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Wind load decreases
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Correct AnswerGain increases
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What are some advantages of a Yagi with wide element spacing?
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Correct AnswerHigh gain, less critical tuning and wider bandwidth
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High gain, lower loss and a low SWR
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High front-to-back ratio and lower input resistance
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Shorter boom length, lower weight and wind resistance
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Why is a Yagi antenna often used for radiocommunications on the 20-metre band?
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It provides excellent omnidirectional coverage in the horizontal plane
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It is smaller, less expensive and easier to erect than a dipole or vertical antenna
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It provides the highest possible angle of radiation for the HF bands
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Correct AnswerIt helps reduce interference from other stations off to the side or behind
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What does "antenna front-to- back ratio" mean in reference to a Yagi antenna?
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The relative position of the driven element with respect to the reflectors and directors
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Correct AnswerThe power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
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The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction
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The number of directors versus the number of reflectors
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What is a good way to get maximum performance from a Yagi antenna?
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Correct AnswerOptimize the lengths and spacing of the elements
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Use RG-58 feed line
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Use a reactance bridge to measure the antenna performance from each direction around the antenna
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Avoid using towers higher than 9 metres (30 feet) above the ground
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The spacing between the elements on a three-element Yagi antenna, representing the best overall choice, is _______ of a wavelength.
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0.15
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0.5
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0.75
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Correct Answer0.2
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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"?
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7 dB
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Correct Answer13 dB
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20 dB
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10 dB
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