2G051 Volume 2 URE Practice Exam

What is the primary purpose of a terminator in coaxial networks?

To filter out noise in the line. To convert impedance from one type to another. To match impedance and prevent reflections at the end of a transmission line. To amplify signal strength.

Correct Answer:

To match impedance and prevent reflections at the end of a transmission line.

Explanation:

The key idea is impedance matching at the end of a transmission line. A terminator provides a load equal to the line’s characteristic impedance, so the traveling RF wave is absorbed at the boundary rather than reflected back toward the source. When reflections occur, they can interfere with the original signal, causing distortion and reduced power transfer. By presenting the proper impedance, the energy is delivered cleanly and the signal integrity is preserved. A terminator isn’t primarily for filtering noise, converting impedances, or boosting signal strength.

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