NCTI Service Technician Practice Exam 2025 - Free Service Technician Exam Questions and Study Guide

Coaxial cable specifications typically include various electrical and physical characteristics to ensure proper performance in communication systems. Among these factors, the diameters of coaxial cables are indeed an important specification, but they refer more to the dimensions of the cable rather than a performance-related specification.

The DC loop resistance is crucial as it affects the signal integrity and power delivery through the cable. Voltage loss characteristics are also critical because they indicate how much signal strength diminishes over distance, which directly impacts the efficiency of data transmission. Operating current levels are relevant to ensure that the coaxial cable can handle the required power without overheating or causing a failure.

In contrast, while coaxial cable diameters are specified, they are primarily related to the physical build of the cable rather than performance metrics, making them less of a specification relevant to signal performance compared to the others.