July 20, 2004
Schoolboys create mobile seeker
A mobile phone detector developed by a team of six New Zealand schoolboys has attracted international interest, reports the BBC,
The boys, pupils at St Thomas of Canterbury College in Christchurch, developed the cheap device as part of a business competition for school pupils.
A mobile detector lets you know when phones are being used surreptiously and can cost hundreds of pounds.
The detector, which they have called CellTrac-r, works by picking up the bursts of radio frequency activity that emit from a mobile each time it sends or receives a call or a text message.
The product is not a toy. It's relatively simple. Because of that the cost is reasonably low
The device can detect these bursts of electro-magnetic energy up to a radius of 30 metres. It can also measure the amount of the energy to determine the distance of the mobile.
The detector then lights up light-emitting diodes - when four LEDs are lit, a mobile is in use close by. Just one lit LED means that the phone is being used at a distance of 25 to 30 metres."
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