What is the purpose of a deviation meter?

Question 1 / 27070rIPXhFxBG77dK2CBKQ0U

Question 1 of 27070rIPXhFxBG77dK2CBKQ0U

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Question 1 of 27070

What is the purpose of a deviation meter?

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🔍 Key Concepts

• Understand what frequency deviation means in FM (frequency modulation) transmissions • Know the difference between modulation depth/index and deviation • Recognize what is actually being measured in an FM transmitter to stay within legal limits

💭 Think About

• Ask yourself: in FM, what parameter swings above and below its normal value when audio is applied? • Which of the options refers specifically to how far the carrier moves from its center frequency, rather than how much audio or side effects it produces? • Think about what technicians need to measure to ensure a VHF/FM marine radio is within its assigned channel bandwidth.

✅ Before You Answer

• Identify which choices relate to AM concepts (like sidebands) rather than FM • Separate modulation index (a mathematical ratio) from a direct measurement tool • Confirm which option clearly describes measuring how much the carrier frequency is shifted from its unmodulated value (carrier deviation)

Question 1 of 27070

What is the purpose of a deviation meter?

Measure the number of sidebands.

Measure the modulation index.

Measure the carrier deviation in an FM transmitter .

Measure the carrier frequency.

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