T9 Antennas and Feed Lines

23 questions in the pool. Your exam will include 2, one from each group below.

Practice T9 now

T9A

Antennas: vertical and horizontal polarization, concept of antenna gain, definition and types of beam antennas, antenna loading, common portable and mobile antennas, relationships between resonant length and frequency, dipole pattern

• 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?

T9B

Feed lines: types, attenuation vs frequency, selecting; SWR concepts; Antenna tuners (couplers); RF Connectors: selecting, weather protection

• 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)?