What is a beam antenna?
AnswerAn antenna that concentrates signals in one direction.
A directional or beam antenna redistributes RF energy so that more signal is transmitted and received in selected directions.
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T9 · Antennas and Feed Lines
Technician · correct answers only, in question-pool order.
Which of the following increases the resonant frequency of a dipole antenna?
AnswerShortening it.
Resonant antenna length and frequency are inversely related: a shorter resonant dipole corresponds to a higher frequency.
What is antenna gain?
AnswerThe increase in signal strength in a specified direction compared to a reference antenna.
Antenna gain describes directional concentration relative to a reference. It does not mean the antenna creates RF power.
What is the major function of an antenna tuner (antenna coupler)?
AnswerIt matches the antenna system impedance to the transceiver's output impedance.
A tuner transforms impedance so the transmitter sees an acceptable load. It does not physically retune the antenna into resonance.
What is standing wave ratio (SWR)?
AnswerA measure of how well a load is matched to a transmission line.
SWR indicates the degree of impedance mismatch between the transmission line and its load.