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T7CEdit

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

T7C01

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

T7C02

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

T7C03

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

T7C04

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

T7C05

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

T7C06

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

T7C07

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

T7C08

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

T7C09

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

T7C10

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

T7C11

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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