The T7C section covers antenna measurements and troubleshooting; measuring SWR, dummy loads, feedline failure modes.
Click "Expand" to reveal the questions.


What is the primary purpose of a dummy load?
To prevent the radiation of signals when making tests


Which of the following instruments can be used to determine if an antenna is resonant at the desired operating frequency?
An antenna analyzer


What, in general terms, is standing wave ratio (SWR)?
A measure of how well a load is matched to a transmission line


What reading on an SWR meter indicates a perfect impedance match between the antenna and the feedline?
1 to 1


What is the approximate SWR value above which the protection circuits in most solidstate transmitters begin to reduce transmitter power?
2 to 1


What does an SWR reading of 4
1 mean?
An impedance mismatch


What happens to power lost in a feedline?
It is converted into heat


What instrument other than an SWR meter could you use to determine if a feedline and antenna are properly matched?
Directional wattmeter


Which of the following is the most common cause for failure of coaxial cables?
Moisture contamination


Why should the outer jacket of coaxial cable be resistant to ultraviolet light?
Ultraviolet light can damage the jacket and allow water to enter the cable


What is a disadvantage of "air core" coaxial cable when compared to foam or solid dielectric types?
It requires special techniques to prevent water absorption

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