What is standing wave ratio (SWR)?
A measure of how well a load is matched to a transmission line
Correct: SWR measures how well a load is matched to the transmission line, ensuring effective power transfer.
The ratio of amplifier power output to input
Incorrect: The ratio of amplifier power output to input relates to amplifier gain, not SWR.
The transmitter efficiency ratio
Incorrect: Transmitter efficiency ratio pertains to how well a transmitter converts input power to RF output power, distinct from SWR.
An indication of the quality of your station’s ground connection
Incorrect: The quality of a station’s ground connection can impact performance but is not measured by SWR.
Explanation
Standing Wave Ratio (SWR) is a crucial concept in amateur radio as it determines the efficiency and effectiveness of the power transfer from your transmitter to your antenna system. Specifically, SWR is a measure of how well a load (like an antenna) is matched to a transmission line (the coaxial cable) connected to the transmitter. The ideal SWR is 1:1, meaning that nearly all the power is transferred to the load with minimal reflection back into the transmitter. High SWR values indicate a mismatch, leading to power being reflected back, which can cause interference, distortion, or even damage to the transmitter over time. Regularly monitoring SWR helps amateur radio operators maintain an efficient and safe setup.
T9B12 2022-2026