Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

Question: 1 / 400

What is the function of an SWR meter?

To measure voltage levels in transmissions.

To determine the SWR in a feedline.

The function of an SWR (Standing Wave Ratio) meter is to determine the SWR in a feedline. SWR is a crucial parameter in radio frequency systems as it measures the efficiency of power transfer from the transmitter through the feedline to the antenna. An ideal SWR reading is 1:1, which indicates that all the power is being radiated by the antenna.

If the SWR is higher, it suggests that some power is being reflected back towards the transmitter, which can lead to inefficiencies and potentially damage the equipment. Regularly measuring the SWR helps operators ensure that their antennas are properly tuned and functioning, which is essential for effective communication and to maintain the longevity of their equipment.

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To amplify the received signal strength.

To regulate power to the antenna.

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