For 100% modulation, DC power input to the...

Question 1 / 27070u54fGRnTnm9dHuO8AJij

Question 1 of 27070u54fGRnTnm9dHuO8AJij

For 100% modulation, DC power input to the modulated RF amplifier should:

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Question 1 of 27070

For 100% modulation, DC power input to the modulated RF amplifier should:

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🔍 Key Concepts

• 100% amplitude modulation (AM) and how carrier power and sideband power relate • How DC input power to the RF power amplifier compares to the audio (AC) modulating power at 100% modulation • Relationship between efficiency and power sharing between carrier and modulation

💭 Think About

• If you have a carrier of a certain power level, how much additional power do the sidebands require at 100% modulation? • How does the audio power from the modulator relate to the increase in RF output power of the amplifier when you go from no modulation to 100% modulation? • What ratio between DC input and AC modulating power would allow the RF amplifier to produce the correct increase in total RF power at 100% modulation without distortion?

✅ Before You Answer

• Be clear on the formula for total RF power at 100% AM modulation in terms of the unmodulated carrier power • Verify how much extra RF power the sidebands represent compared to the carrier at 100% modulation • Check whether any of the listed ratios (same, 1/2, 1/4) match the required relationship between DC input power to the RF amplifier and AC modulating power for proper 100% modulation

Question 1 of 27070

For 100% modulation, DC power input to the modulated RF amplifier should:

Be the same as the AC power from the modulation

Be 1/2 the AC power from the modulation

Be 1/4 the AC power from the modulation

None of the above

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Question 1 / 27070u54fGRnTnm9dHuO8AJij

Question 1 of 27070u54fGRnTnm9dHuO8AJij

For 100% modulation, DC power input to the modulated RF amplifier should:

Back

Question 1 of 27070

For 100% modulation, DC power input to the modulated RF amplifier should:

If the question has a related picture, it will appear here.