Transmitter range...and your a**
#1
Transmitter range...and your a**
...or how and why using your body increases the transmitter range.
From Science in the News:
How to increase the range of your car's remote door lock:
Try pointing your bum at your car while pressing the key ring against your buttocks.
The range over which the remote control operates nearly doubles when you involve your body because your body picks up the radio signal and acts like a large aerial, transmitting it more effectively to the car.
The key and the body act like the two plates of a capacitor separated by an electrical insulator. When an electric charge flows into or out of one of the plates, the electrostatic effect drives a similar charge into or out of the other. Although no charge actually crosses the insulator, a current appears to flow for a while until the capacitor is fully charged. Applying a varying current to one plate means that the capacitor never gets fully charged and a current appears to flow indefinitely through the second plate.
This phenomenon, which is called capacitive coupling, works best with rapidly varying currents, which is exactly what the radio transmitter in the key ring produces.
Because it operates at a frequency of 433 megahertz, the current from the key can cross the insulating barriers of your clothing and skin to reach the conducting interior of your body. Your body then acts as a giant aerial when you press your remote control against it
From Science in the News:
How to increase the range of your car's remote door lock:
Try pointing your bum at your car while pressing the key ring against your buttocks.
The range over which the remote control operates nearly doubles when you involve your body because your body picks up the radio signal and acts like a large aerial, transmitting it more effectively to the car.
The key and the body act like the two plates of a capacitor separated by an electrical insulator. When an electric charge flows into or out of one of the plates, the electrostatic effect drives a similar charge into or out of the other. Although no charge actually crosses the insulator, a current appears to flow for a while until the capacitor is fully charged. Applying a varying current to one plate means that the capacitor never gets fully charged and a current appears to flow indefinitely through the second plate.
This phenomenon, which is called capacitive coupling, works best with rapidly varying currents, which is exactly what the radio transmitter in the key ring produces.
Because it operates at a frequency of 433 megahertz, the current from the key can cross the insulating barriers of your clothing and skin to reach the conducting interior of your body. Your body then acts as a giant aerial when you press your remote control against it
#6
Touch the transmitter to your forehead and press the button. It really does just about double the distance. Mine works at about 30 ft normally anyway Not sure why I'd want to unlock the doors farther away than that...even if it was to let someone else in. They can wait 2 seconds until I get close enough.
#7
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