Ham Radio Technician Test Antennas & Feedlines 3

Question 1

What is the impedance of a typical half-wave dipole antenna in free space?

Accepted Answer

73 ohms

Answer

50 ohms

Answer

300 ohms

Answer

600 ohms

Question 2

What happens to the SWR on a feedline if the antenna is perfectly matched to the line's characteristic impedance?

Accepted Answer

SWR equals 1:1

Answer

SWR equals 2:1

Answer

SWR becomes infinite

Answer

SWR depends on line length

Question 3

What is the main disadvantage of using a very long coaxial feedline run at UHF frequencies?

Accepted Answer

Significantly increased signal loss

Answer

Higher SWR due to cable length

Answer

Increased radiation from the feedline

Answer

Reduced antenna bandwidth

Question 4

Which type of antenna connector is most commonly used for handheld VHF/UHF transceivers?

Accepted Answer

SMA

Answer

PL-259 (UHF)

Answer

N-type

Answer

BNC

Question 5

What is the term for the ratio of the maximum to minimum voltage along a transmission line?

Accepted Answer

Voltage Standing Wave Ratio (VSWR)

Answer

Standing Wave Ratio (SWR)

Answer

Reflection coefficient

Answer

Return loss

Question 6

A Yagi antenna's gain is primarily achieved by:

Accepted Answer

Focusing radiation in one direction using directors and a reflector

Answer

Using a larger wire diameter

Answer

Operating at multiple resonant frequencies

Answer

Combining signals from multiple feedlines

Question 7

What is an antenna tuner (also called an antenna coupler) used for?

Accepted Answer

To match the transceiver's output impedance to the feedline and antenna system

Answer

To amplify the transmitted signal

Answer

To filter out harmonics from the transmitter

Answer

To measure field strength near the antenna