Basic
Subelement 6
Feedlines and Antenna Systems
Section 6-05
standing waves, standing wave ratio, SWR meter
What does an SWR reading of 1:1 mean?
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Correct AnswerThe best impedance match has been attained
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An antenna for another frequency band is probably connected
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No power is going to the antenna
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The SWR meter is broken
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What does an SWR reading of less than 1.5:1 mean?
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Correct AnswerA fairly good impedance match
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An impedance match which is too low
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An impedance mismatch; something may be wrong with the antenna system
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An antenna gain of 1.5
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What kind of SWR reading may mean poor electrical contact between parts of an antenna system?
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A negative reading
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No reading at all
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Correct AnswerA jumpy reading
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A very low reading
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What does a very high SWR reading mean?
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The transmitter is putting out more power than normal, showing that it is about to go bad
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Correct AnswerThe antenna is the wrong length, or there may be an open or shorted connection somewhere in the feed line
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There is a large amount of solar radiation, which means very poor radio conditions
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The signals coming from the antenna are unusually strong, which means very good radio conditions
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What does standing-wave ratio mean?
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Correct AnswerThe ratio of maximum to minimum voltages on a feed line
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The ratio of maximum to minimum inductances on a feed line
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The ratio of maximum to minimum resistances on a feed line
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The ratio of maximum to minimum impedances on a feed line
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If your antenna feed line gets hot when you are transmitting, what might this mean?
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You should transmit using less power
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The conductors in the feed line are not insulated very well
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The feed line is too long
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Correct AnswerThe SWR may be too high, or the feed line loss may be high
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If the characteristic impedance of the feedline does not match the antenna input impedance then:
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heat is produced at the junction
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the SWR reading falls to 1:1
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the antenna will not radiate any signal
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Correct Answerstanding waves are produced in the feedline
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The result of the presence of standing waves on a transmission line is:
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perfect impedance match between transmitter and feedline
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maximum transfer of energy to the antenna from the transmitter
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lack of radiation from the transmission line
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Correct Answerreduced transfer of RF energy to the antenna
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An SWR meter measures the degree of match between transmission line and antenna by:
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Correct Answercomparing forward and reflected voltage
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measuring radiated RF energy
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measuring the conductor temperature
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inserting a diode in the feed line
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A resonant antenna having a feed point impedance of 200 ohms is connected to a feed line and transmitter which have an impedance of 50 ohms. What will the standing wave ratio of this system be?
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6:1
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3:1
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Correct Answer4:1
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5:1
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The type of feed line best suited to operating at a high standing wave ratio is:
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75 ohm twin-lead
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Correct Answer600 ohm open-wire
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coaxial line
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300 ohm twin-lead
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