Question 1 of 27070dRWGd0w4zMTyUX9EouZW

The plate current of the final RF amplifier in a transmitter increases and radiation decreases, if the antenna circuit is in good order, what could be the cause?

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Question 1 of 27070
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The plate current of the final RF amplifier in a transmitter increases and radiation decreases, if the antenna circuit is in good order, what could be the cause?

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🔍 Key Concepts

• Behavior of plate current vs RF output power in a final amplifier • Effects of detuning, bias loss, and neutralization on a transmitter’s final stage • How grid excitation, faulty tubes, and parasitic oscillations can change current and radiation

💭 Think About

• If plate current increases but RF radiation decreases, what does that tell you about how efficiently DC power is being converted to RF power? • Which of the listed problems would cause the tube to draw more current while producing less useful RF output? • Are any of the listed causes mutually exclusive, or could several of them lead to the same symptom of high plate current and low radiation?

✅ Before You Answer

• For each choice (A, B, C), ask: Would this increase plate current AND decrease RF output? • Consider whether detuning and loss of bias both affect operating point and efficiency in a way consistent with the symptom. • Check if parasitic oscillations and faulty tubes can draw power without radiating effectively at the desired frequency.