Technician · T9
ANTENNAS AND FEED LINES
Getting your signal into the air and back out again: antenna types, feed lines, SWR, and why a mismatched antenna wastes your transmitter power.
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23 questions across 2 groups
Group T9A
- T9A01What is a beam antenna?
- T9A02Which of the following describes a type of antenna loading?
- T9A03How is the polarization of an antenna described?
- T9A04What is a disadvantage of a handheld radio transceiver’s short flexible antenna compared to a full-sized quarter- wave antenna?
- T9A05Which of the following increases the resonant frequency of a dipole antenna?
- T9A06Which of the following types of antennas offers the greatest gain?
- T9A07What is a potential drawback of using a handheld VHF transceiver inside a vehicle that lacks an externally mounted antenna?
- T9A08Why is a 19-inch-long vertical antenna often used on 2 meters?
- T9A09What is an advantage of a 5/8-wavelength whip antenna for VHF or UHF mobile service compared to a 1/4-wave antenna?
- T9A10In which direction does a half-wave dipole antenna radiate the strongest signal?
- T9A11What is antenna gain?
Group T9B
- T9B01Which of the following connectors should be carefully taped for weather protection when used outdoors?
- T9B02What is the most common impedance of coaxial cables used in amateur radio?
- T9B03Why is coaxial cable the most common feed line for amateur radio antenna systems?
- T9B04What is the major function of an antenna tuner (antenna coupler)?
- T9B05What happens as the frequency of a signal in coaxial cable is increased?
- T9B06Which of the following connector types is most suitable as an RF connector for frequencies above 400 MHz?
- T9B07Which of the following is true of PL-259 type coax connectors?
- T9B08Which of the following is a source of loss in coaxial feed line?
- T9B09What can cause erratic changes in SWR?
- T9B10What is the electrical difference between RG-58 and RG-213 coaxial cable?
- T9B11Which of the following types of feed line has the lowest loss?
- T9B12What is standing wave ratio (SWR)?