Transponder keys are fast becoming quite common for use in newer automobiles. Also called chip keys, these gizmos significantly improve a car’s security. Firstly, they’re difficult to copy or replicate. Also, a car that uses one of these keys is very hard for a thief to steal.

They work like this. Transponders are electronic units built to transmit and respond to electric impulses. They do this in a wireless fashion, like a wireless computer modem. The technology has been around for almost eighty years, but new applications continue to be found. First used by World War 2 pilots to send coded signals to ground radar, this made it possible to announce their status as a friend rather than an enemy.

Transponders continue to be used extensively in aviation today. They are the devices in airplanes responsible for letting the operators in airport control towers know which aircraft are where. They are what make all those little blips on the radar screens, communicating such vital data as direction and altitude.

There are numerous other applications for transponder technology. If you’ve ever driven on a toll road and noticed that some cars don’t stop at the booth to pay a fee like everyone else, here’s why. These are probably daily commuters and they’ve has a transponder installed on their vehicle, allowing each of their trips to be counted by the computer in the toll plaza.

If you own a cell phone, you already have a transponder. Cell phones are required to have these devices built in. That way, if a call is ever made to 9-1-1 from that phone, its location can be easily traced. This can, in some cases, be a lifesaver. Mountain climbers and backpackers might also use one of these gadgets for use in case they get in some kind of trouble and require assistance.

A fairly new development for the use of this technology is in the chip key, so called because of the chip or circuit embedded within the head of the key. These keys, used for automotive ignition systems, go a long way in securing the vehicles in which they’re used. When the key is inserted and turned in the ignition cylinder of the car, the on-board computer sends a signal to the key and waits for a response. The key, which doesn’t use batteries but is energized by the computer signal it receives, then sends a coded message back to the car’s computer. If the key does not respond with the proper message, the car simply shuts down and will not start.

Transponder keys really bolster an automobile’s security system. In the old days, a car thief could hot wire a car’s starting system or simply break open the ignition cylinder, start the car and drive away. This has all changed with the advent micro-technology and computerization. And anything that makes it tougher on the bad guys must be good.

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