Question
Which instrument can be used to determine SWR?
Answer Options
- A) Voltmeter
- B) Ohmmeter
- C) Iambic pentameter
- D) Directional wattmeter
Correct Answer: D
Explanation
The instrument used to measure Standing Wave Ratio (SWR) is the Directional wattmeter (or SWR meter). This device works by measuring two distinct power levels simultaneously: the power traveling forward (from the radio to the antenna) and the power traveling reflected (from the antenna back to the radio).
The meter then calculates the ratio of the maximum to minimum voltage (or power) along the line, providing the SWR reading (e.g., 1.5:1). A simple wattmeter measures only forward power, but a directional wattmeter is required for SWR measurement.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!