What condition may cause distortion in the...

Question 1 / 20QV2jtX9sCwNzBiKU9kmS

Question 1 of 20QV2jtX9sCwNzBiKU9kmS

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

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Question 1 of 20

QV2jtX9sCwNzBiKU9kmS

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

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🔍 Key Concepts

• FM modulation limits for marine VHF transmitters • Role of the modulator stage vs. later RF stages (like the VCO and power amplifier) • The purpose of pre-emphasis and typical audio frequency ranges in marine VHF

💭 Think About

• Which option directly describes a condition of too much modulation rather than a component failure or misalignment issue? • Marine VHF uses voice audio; what is the realistic audio frequency range involved, and does anything above 25 kHz make sense for normal voice signals? • Is a problem with the voltage controlled oscillator (VCO) usually described as modulator distortion, or would it show up as something else (like frequency instability)?

✅ Before You Answer

• Verify the normal modulation percentage range for FM voice transmitters and what happens when this is exceeded. • Check whether audio pre‑emphasis is normally applied at audio frequencies (e.g., Hz to a few kHz) or at tens of kHz and how that would affect voice quality. • Consider which choices describe general operating conditions (like level of modulation) versus very specific component faults, and which is more likely to be a textbook cause of "distortion in the modulator stage."

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Question 1 of 20

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

The reactance modulator may be out of alignment.

The excessive use of pre-emphasis on audio signals above 25 kHz.

A defective varactor diode in the transmitter's voltage controlled oscillator.

Transmitter modulation in excess of 150 %.

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Question 1 / 20QV2jtX9sCwNzBiKU9kmS

Question 1 of 20QV2jtX9sCwNzBiKU9kmS

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

Back

Question 1 of 20

QV2jtX9sCwNzBiKU9kmS

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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