Question
Which of the following may cause receive interference to an HF transceiver installed in a vehicle?
Answer Options
- A) The battery charging system
- B) The fuel delivery system
- C) The control computers
- D) All these choices are correct
Correct Answer: D
Explanation
Modern vehicles are highly complex electronic environments, and many components can generate unwanted electrical noise that causes receive interference (QRM) to an HF transceiver. This noise can be either radiated or conducted through the power wiring.
Sources can include the battery charging system (alternator whine or regulator noise), the fuel delivery system (noise from the electric fuel pump), and the vehicle’s various control computers (which generate digital switching noise). All of these components are potential sources of noise, requiring the amateur operator to dedicate time to suppression techniques, such as grounding, bonding, and adding ferrite chokes.
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