Which of the following is a source of loss in coaxial feed line?

The correct answer acknowledges that all the listed factors contribute to loss in a coaxial feed line. Each source mentioned affects the efficiency of signal transmission along the feed line, which is crucial for optimal performance in amateur radio systems.

Water intrusion into coaxial connectors can create a path for electrical degradation, leading to increased resistance and potential signal loss. Moisture can affect the integrity of the connectors and the insulation within the coaxial line, causing reflections and attenuation.

High Standing Wave Ratio (SWR) indicates an impedance mismatch in the feed line, which means that not all the RF power generated by the transmitter is being efficiently transmitted through the antenna system. High SWR can lead to reflections of the signal back into the feed line, which causes a loss of signal strength and can potentially damage the transmitter.

Multiple connectors in the line introduce additional points where the signal can degrade. Each connector presents a potential for increased loss due to the physical connections and the construction materials involved. The interface between different components can reflect or absorb some of the RF energy, causing further attenuation.

By acknowledging all of these sources of loss, the response captures the complexity of maintaining optimal performance in coaxial feed systems and emphasizes the importance of addressing all these factors to minimize signal loss.