Question
In what units is RF feed line loss usually expressed?
Answer Options
- A) Ohms per 1,000 feet
- B) Decibels per 1,000 feet
- C) Ohms per 100 feet
- D) Decibels per 100 feet
Correct Answer: D
Explanation
RF feed line loss quantifies how much signal power is dissipated as heat in a specific length of the cable. Since the decibel (\text{dB}) is a standard logarithmic unit for expressing a ratio of power, it is used to state the loss relative to the input power.
RF feed line loss is conventionally expressed as decibels per 100 feet (or per 100 meters in metric regions). This unit allows operators to easily calculate the total loss for any length of cable by multiplying the loss factor by the length in hundreds of feet.
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