Ham Radio Extra Class Practice Test 2026 - Free Extra Class License Exam Questions and Study Guide

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What is a common use for a balun in antenna systems?

To enhance grounding

To match balanced and unbalanced lines

A balun, short for "balanced to unbalanced transformer," is commonly used in antenna systems to match balanced lines, such as dipole antennas, to unbalanced lines, like coaxial cables. This matching is essential because it allows for efficient power transfer and minimizes reflections that can degrade the signal. When a balanced load is connected to an unbalanced feed line without a balun, it can lead to imbalances that affect radiation patterns and signal quality.

The primary function of a balun is to ensure that both lines are effectively coupled while maintaining their respective balanced or unbalanced characteristics. This capability is critical in many antenna applications where the interaction between balanced and unbalanced components could lead to performance issues. By providing this matching function, the balun helps maintain the integrity of the signal throughout the transmission process.

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To filter out noise

To increase signal strength

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