Question
What indicates the correct value of terminating resistance for a Beverage antenna?
Answer Options
- A) Maximum feed point DC resistance at the center of the desired frequency range
- B) Minimum low-angle front-to-back ratio at the design frequency
- C) Maximum DC current in the terminating resistor
- D) Minimum variation in SWR over the desired frequency range
Correct Answer: D
Explanation
A Beverage antenna is a traveling wave antenna, meaning the RF energy travels down the long wire. To prevent the signal from reflecting back and creating a standing wave (which would cause the antenna to be bidirectional), the far end must be terminated with a non-inductive resistance equal to the characteristic impedance of the antenna line (typically 400Ω to 600Ω).
The correct value of the terminating resistance is chosen to absorb the signal, eliminating reflections and maximizing the directivity. The best practical indicator that the correct value has been found is the minimum variation in SWR over the desired frequency range. If the line is properly terminated, the SWR remains low and stable across the entire band.
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