skip to content skip to search skip to navigation Listen Live skip to logon
Friday 19th December 2014
Max 11°C | Min 5°C

Why do car key fobs work better if they're by your head?

Question

key.jpgIf you’re out of range, your car key fob button won’t work, but if you put it to your head, it does work. Why?
Dave, Chelsea

Answer

** Definitive **
Name: Colin, Stamford Hill
Qualification: Electronics City and Guilds
Answer: When you put the transmitter against the body, the body acts like an amplifier and amplifies the RF (radio frequency wave) signal towards the car. The fluid in the body transmits the signal as your body acts like an aerial. Like when you made a crystal radio when you were younger and it worked better by the radiator.

Do you disagree? Write your answer in the box below.

Comments