Question
What is the purpose of an antenna tuner?
Answer Options
- A) Reduce the SWR in the feed line to the antenna
- B) Reduce the power dissipation in the feedline to the antenna
- C) Increase power transfer from the transmitter to the feed line
- D) All these choices are correct
Correct Answer: C
Explanation
An antenna tuner, more accurately called an antenna matching network or Transmatch, is designed to transform the complex impedance presented by the feed line (which is determined by the antenna’s SWR) into the purely resistive impedance that the transmitter expects (typically 50 ohms). The primary purpose of this matching is to increase power transfer from the transmitter to the feed line.
While matching the impedance does not change the Standing Wave Ratio (SWR) on the feed line between the tuner and the antenna, it ensures that the transmitter is operating into its intended load. This prevents the transmitter’s internal protection circuits from reducing power and allows the maximum RF energy to be sent out to the antenna system.
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