Question
What does a dummy load consist of?
Answer Options
- A) A high-gain amplifier and a TR switch
- B) A non-inductive resistor mounted on a heat sink
- C) A low-voltage power supply and a DC relay
- D) A 50-ohm reactance used to terminate a transmission line
Correct Answer: B
Explanation
As discussed in T7C01, a dummy load is designed to absorb all RF power by presenting a perfect resistive load. To achieve this, it consists primarily of a non-inductive resistor mounted on a heat sink.
The resistor must be non-inductive so that its resistance value does not change with frequency, ensuring it looks like a perfect 50\text{ Ohm} load across all bands. The heat sink (a large metal cooling structure) is necessary because the resistor converts all the transmitted power into heat, which must be safely dissipated into the air.
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