Ham Radio General Class Practice Test

What does an S meter measure?

1. Conductance

2. Impedance

3. Received signal strength

4. Transmitter power output

The correct answer is: Received signal strength

An S meter measures received signal strength. It provides a visual indication of how strong a radio signal is being received at a given moment. This measurement is typically displayed in the form of an S unit, which is a logarithmic representation of signal strength, helping operators determine the quality of the incoming signal. Understanding the signal strength can aid in diagnosing communication issues, adjusting equipment, and optimizing antenna setups for better reception. Conductance, impedance, and transmitter power output are different parameters related to radio operation and electronics. Conductance refers to a material's ability to conduct electric current, impedance relates to the opposition that a circuit presents to the passage of a current when a voltage is applied, and transmitter power output indicates the power level at which a transmitter is operating. While these factors impact radio performance, they do not pertain to the direct measurement of incoming signal strength as indicated by an S meter.