How does my car antenna transmit the cellular signal to my phone which is paired to my car via bluetooth?
In: Technology
Your car antenna isn’t involved.
Bluetooth is kinda like low power, short range radio. Your car and phone are using radio waves to communicate. Your phone is sending data like music, whether or not you’re being called, and call audio to your car. Your car is, in turn sending microphone input (if you’re talking on the phone), and other inputs to tell your phone what to do, like skip a song or answer the call.
The reason only one device can be connected at a time is that Bluetooth technology requires both the controller and accessory devices agree on a frequency to listen and transmit on and other devices can’t spontaneously connect and listen in on that frequency.
It doesn’t.
The cell tower transmits directly to your phone, whether you’re in your car or not. Your phone transmits audio and data to/from the car over their Bluetooth link, which is a separate radio connection.
The car’s radio antenna isn’t involved. The car stereo has a Bluetooth receiver. The phone still uses its own internal antenna for its service, then transmits a Bluetooth signal to the car stereo so that your calls, music, GPS directions, etc all come through the car speakers.
Your car antenna isn’t involved at all. The system still uses your phone as the transceiver just as with any call. It just pipes the call through the speakers and has basic call control. Your car is basically like a giant Bluetooth earpiece.
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