A) Noise on the vehicle's electrical system is being transmitted along with your speech audio
NJ2X Notes:
The ignition system on any vehicle is often the source of RFI. Ignition and injection systems both include an inductor which produces a high-voltage pulse for firing the spark plug. The spark plug creates a considerable amount of RFI which is radiated throughout the car's wiring system. This can cause a great deal of noise on a mobile ham radio. Fortunately, there are several effective techniques which can be used to reduce or eliminate RFI generated by a vehicle including: filtering the power and replacing worn ignition wires and plugs.
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