Question
What happens to power lost in a feed line?
Answer Options
- A) It increases the SWR
- B) It is radiated as harmonics
- C) It is converted into heat
- D) It distorts the signal
Correct Answer: C
Explanation
Any RF power that is not radiated by the antenna or reflected back to the transmitter is dissipated as loss within the antenna system itself, primarily within the feed line (coaxial cable). This energy conversion follows the basic law of resistance, where electrical energy passing through a resistance is converted into thermal energy.
Therefore, power lost in a feed line as a result of cable resistance or high SWR is always converted into heat. This is why the coaxial cable may feel warm when transmitting high power, especially with a high SWR.
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