Question
Which of the following can be determined with a directional wattmeter?
Answer Options
- A) Standing wave ratio
- B) Antenna front-to-back ratio
- C) RF interference
- D) Radio wave propagation
Correct Answer: A
Explanation
A directional wattmeter measures the power flowing from the transmitter to the antenna (forward power) and the power reflected back from the antenna (reflected power). Both of these values are necessary components for calculating the Standing Wave Ratio (SWR).
The directional wattmeter uses internal sensors to separate the forward and reflected waves. The SWR, defined as the ratio of maximum to minimum voltage along the transmission line, is then calculated using the measured power values, providing the operator with a key metric of how well the antenna system is matched to the feed line.
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