Which category do vehicle ignitions, electric motors, and computers fall into regarding radio limitations?

• A. Interference
• B. Road blocks
• C. Ambient noise
• D. Physical barriers

Answer: (A)

Interference is the category for unwanted radio energy that disrupts or degrades communications. Vehicle ignitions, electric motors, and computers all generate electrical noise and RF emissions. Sparks and transient spikes from ignitions radiate energy; motors produce noise from brushes and switching; computers, with their rapid switching power supplies and clocks, emit EMI. This unwanted energy can be picked up by a radio receiver as static, buzzing, or garbled signals, making messages harder to understand. Ambient noise would be natural background static, not produced by specific equipment; physical barriers block or weaken signals; road blocks isn’t a standard term for radio limitations.