Originally posted by O'Mankie:
Well, seemed like I stumped you all…even Mr. "I know everthing about everything" GGW.
It's all down to my extra sensory powers!
Alright, Mankie, give me some time to sign on.
Your car alarm remote operates at a very low frequency and the human body actually acts as an antenna for low frequency singals. Not all signal transmissions are based on metal - some are based on heat, and for low frequencies like AM/FM stereo and old cordless phones, the heat from the human body actually acts as an antenna and strenthens your signal.
I'm surprised you just now discovered this. You don't have to touch your head either - you can simply put your finger across the front of your remote.
Take, for example, your FM tuner. With no antenna, you get very little recpetion. With a wire antenna, your reception increases depending on the length and access to open air signals. When you touch the antenna, your signal again increases because of your natural 98.6 body heat. The stronger the frequency, however, the less effect your body heat has on the signal. The AM signal is greatly magnified by touching the antenna, but your 2.4 GHZ wireless internet connection has almost no increased signal strength when you touch the antenna. Your old mobile phones (the StarTac being the classic example) operated at mostly 900 MHZ and if you touched the antenna you could use your body to act as a larger antenna then the little wire sticking out of your phone. Now they operate in the 2.4 GHZ stream because digital data travels faster at that frequency and touching the antenna has less of an effect.
Some companies are working on ways to access this natural conducted heat in the human body to send electrical signals and even data through the human body instead of wirelessly. For example, if you saw a movie poster, you could touch the screen and send local show times to your mobile device by touching it's sensor. It's much more user friendly then using bluetooth.
But don't knock bluetooth. Stuff is the bomb.