Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

A noise blanker in a receiver primarily functions to reduce impulsive noise interference, which often comes from sources like electrical equipment, vehicle ignition systems, or other transient signals that produce short bursts of noise. This impulsive noise can mask or interfere with the reception of weaker signals, making it difficult for operators to hear the desired transmissions clearly.

The noise blanker works by detecting and responding to these sharp, transient noise spikes and effectively muting them without compromising the integrity of the desired signals. This operation helps improve the overall clarity of received audio, especially in environments with substantial electrical interference.

While amplifying weak signals, enhancing selectivity, or improving bandwidth are relevant aspects of radio receiving technology, they do not pertain specifically to the role of a noise blanker. The design and purpose of a noise blanker are specifically aimed at dealing with impulsive noise, making it an essential tool for maintaining communication quality in noisy environments.