What is car FM?
3 Answers
Car FM refers to the frequency modulation band in the radio function. Its working principle is: modulating the audio signal onto the frequency of a high-frequency carrier wave, transmitting it into the air, the FM radio receives the radio signal through the antenna, separates the audio signal through tuning, intermediate frequency amplification, and frequency discrimination circuits, and then amplifies the low frequency to output sound through the speaker. The buttons in the car are divided into: 1. Fuel tank opening button: remotely opens the fuel tank cap inside the car; 2. ESP switch: used to turn the vehicle's ESP on and off; 3. Central lock button: the control button for the vehicle's central door lock; 4. Headlight cleaning button: controls the automatic cleaning function of the headlights; 5. Rear sunshade button: controls the opening and closing of the electric rear sunshade inside the car.
When I first bought my car, I also wondered what FM meant. Simply put, it's the car radio! It's what you use to listen to the radio while driving, tuning in to music stations or traffic updates during jams—super handy. Just watch out for aging antennas; otherwise, the signal might get all staticky. Once during a road trip in the mountains, my FM signal kept cutting in and out, and I later found out the shark fin antenna's rubber seal had cracked and let water in. Also, if you upgrade to high-power speakers, it's best to add a filter to avoid current noise interfering with the radio. Some people think Bluetooth is the same as FM—totally not the case!
My son just asked me this question the other day. FM refers to the wireless communication function of the car key, which allows you to unlock and start the car from dozens of meters away. Many keyless entry cars nowadays rely on this technology, but don't pile the key together with your phone—you know how subway cards can get demagnetized? Same principle here! Last time at the mall parking lot, my car wouldn't respond to the key at all, and it turned out to be interference from a nearby electric vehicle charging station. The 4S shop mechanic said if it frequently malfunctions, you might need to replace the key battery or check the door sensors.
