Feedlines and Antenna Systems
popular antenna feed line and coaxial connector types
Why does coaxial cable make a good antenna feed line?
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It is weatherproof, and its impedance is higher than that of most amateur antennas
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Correct AnswerIt is weatherproof, and its impedance matches most amateur antennas
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It can be used near metal objects, and its impedance is higher than that of most amateur antennas
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You can make it at home, and its impedance matches most amateur antennas
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What is the best antenna feed line to use, if it must be put near grounded metal objects?
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Ladder-line
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Twisted pair
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Correct AnswerCoaxial cable
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Twin lead
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What are some reasons not to use parallel-conductor feed line?
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You must use an impedance-matching device with your transceiver, and it does not work very well with a high SWR
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It does not work well when tied down to metal objects, and it cannot operate under high power
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Correct AnswerIt does not work well when tied down to metal objects, and you must use an impedance- matching device with your transceiver
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It is difficult to make at home, and it does not work very well with a high SWR
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What common connector usually joins RG-213 coaxial cable to an HF transceiver?
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Correct AnswerA PL-259 connector
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An F-type cable connector
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A banana plug connector
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A binding post connector
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What common connector usually joins a hand-held transceiver to its antenna?
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Correct AnswerA BNC connector
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A PL-259 connector
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An F-type cable connector
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A binding post connector
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Which of these common connectors has the lowest loss at UHF?
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An F-type cable connector
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A BNC connector
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A PL-259 connector
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Correct AnswerA type-N connector
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If you install a 6 metre Yagi antenna on a tower 50 metres from your transmitter, which of the following feed lines is best?
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RG-174
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RG-59
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Correct AnswerRG-213
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RG-58
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Why should you regularly clean, tighten and re-solder all antenna connectors?
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Correct AnswerTo help keep their resistance at a minimum
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To keep them looking nice
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To keep them from getting stuck in place
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To increase their capacitance
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What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects?
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75 ohm twin-lead
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600 ohm open-wire
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Correct AnswerCoaxial cable
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300 ohm twin-lead
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When antenna feed lines must be placed near grounded metal objects, which of the following feed lines should be used?
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300 ohm twin-lead
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600 ohm open-wire
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75 ohm twin-lead
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Correct AnswerCoaxial cable
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TV twin-lead feed line can be used for a feed line in an amateur station. The impedance of this line is approximately:
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600 ohms
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50 ohms
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Correct Answer300 ohms
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70 ohms
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