T7C - Practical circuits
Technician Class
Antenna and transmission line measurements and troubleshooting: measuring SWR, effects of high SWR, causes of feed line failures; Basic coaxial cable characteristics; Use of dummy loads when testing
11 questions | Updated: Feb 19, 2026
What is the primary purpose of a dummy load?
Which of the following is used to determine if an antenna is resonant at the desired operating frequency?
What does a typical RF dummy load consist of?
What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?
Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?
What does an SWR reading of 4:1 indicate?
What happens to power lost in a feed line?
Which instrument can be used to determine SWR?
Which of the following causes failure of coaxial cables?
Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
What is an advantage of foam-dielectric versus solid-dielectric coaxial cable?