Question 1 of 27070
Q
What might be the cause of a positive shift in carrier amplitude during modulation?
A
Parasitic oscillations, excessive audio drive
B
Incorrect tuning of final amplifier
C
Insufficient RF excitation, incorrect neutralization
D
All of the above
Question 1 / 27070vAlK7Ov8OoujapDB8E2v
Question 1 of 27070vAlK7Ov8OoujapDB8E2v

What might be the cause of a positive shift in carrier amplitude during modulation?

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Question 1 of 27070
Q

What might be the cause of a positive shift in carrier amplitude during modulation?

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🔍 Key Concepts

• Amplitude modulation (AM) and how the carrier, sidebands, and audio drive relate • How overmodulation, mistuning, or instability can affect carrier amplitude • The difference between insufficient vs. excessive RF or audio drive in a transmitter

💭 Think About

• Which choices describe conditions that could make the carrier swing higher than normal rather than just drop or distort? • For each option, ask: does this fault tend to cause unsteady/erratic changes in carrier level, or a steady positive shift? • Could more than one of these conditions be present at the same time, and if so, would they tend to increase or decrease the carrier amplitude?

✅ Before You Answer

• Identify which options involve too much drive versus too little drive • Consider how incorrect tuning or neutralization in RF stages typically shows up on an RF wattmeter or modulation monitor • Verify which conditions are likely to create spurious signals and carrier overshoot (positive shift) rather than simple loss of output