If the indicated distance to a lighthouse is found to be in error, what circuit should be suspected?

In the context of determining the indicated distance to a lighthouse, a range ring oscillator is a critical component of radar systems, particularly those used in marine navigation. This oscillator is responsible for generating the timing signals necessary for measuring distances. It creates circular range rings on a radar display, which represent different distances from the radar source.

When the indicated distance is found to be erroneous, it suggests that there might be an issue with the timing or frequency of the signals being generated. The range ring oscillator is directly involved in these calculations, since it provides the baseline for measuring how far away an object, like a lighthouse, is from the radar system. If the oscillator is malfunctioning or not calibrated properly, the distance readings can be skewed, leading to an incorrect representation of how far the lighthouse actually is.

In contrast, other options like the video amplifier or STC (Sensitivity Time Control) circuit do not primarily affect distance measurements. The video amplifier is concerned with the amplification of the received radar signals for display, while the STC circuit adjusts the sensitivity of the radar receiver to account for differing signal strengths over distance. The FTC (Frequency-Time Compensation) circuit is designed to synchronize signal strength and timing but does not specifically influence the measurements of range as directly as