Question T7A08
From subelement T7 - T7A
Which of the following describes combining speech with an RF carrier signal?
Why is this correct?
Modulation is the process of combining speech or other information with an RF carrier signal. The retrieved context clearly states that 'the process of combining speech with an RF carrier signal is called modulation.' This allows your voice to be transmitted over radio waves. Impedance matching optimizes power transfer between components, oscillation generates signals at specific frequencies, and low-pass filtering removes unwanted high frequencies - none of these combine speech with RF carriers.
Memory tip
Remember this pattern: modulation questions involve 'combining' or 'adding information to' a carrier signal. The key word 'combining' in the question directly points to modulation. When you see terms about merging audio with RF signals, think modulation first.
Learn more
In practical amateur radio operation, modulation determines your transmission mode - whether you're using frequency modulation (FM) for local repeater work, amplitude modulation variants like single sideband (SSB) for HF DX, or digital modulation schemes for packet radio. Understanding modulation types helps you choose the right emission designator and operating procedures for your frequency privileges under Part 97.
Think about it
Why do you think different modulation types like FM and SSB are better suited for different amateur radio applications and frequency bands?