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E8B - Signals and Emissions

Extra Class

Modulation: AM, FM, PM index, deviation ratio, bandwidth

11 questions | Updated: Dec 9, 2025

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E8B01

What is the modulation index of an FM signal?
E8B02

How does the modulation index of a phase-modulated emission vary with RF carrier frequency?
E8B03

What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?
E8B04

What is the modulation index of an FM phone signal having a maximum carrier deviation of plus or minus 6 kHz if the highest modulating frequency is 2 kHz?
E8B05

What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 5 kHz if the highest modulation frequency is 3 kHz?
E8B06

What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 7.5 kHz if the highest modulation frequency is 3.5 kHz?
E8B07

Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?
E8B08

What describes orthogonal frequency-division multiplexing (OFDM)?
E8B09

What is deviation ratio?
E8B10

What is frequency division multiplexing (FDM)?
E8B11

What is digital time division multiplexing?