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This handy, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from one-and-a-half meters. So, it can be used to prevent the use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of a mobile phone for Spying and unauthorized video transmission. The circuit can detect the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. Assemble the circuit on a general-purpose PCB as compact as possible and enclose in a small box-like junk mobile case. As mentioned earlier, capacitor C3 should have a lead length of 18 mm with a lead spacing of 8 mm. Carefully solder the capacitor in a standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. You may use a short telescopic type antenna. Use the miniature 12V battery of remote control and a small buzzer to make the gadget pocket-size. The unit will give the warning indication if someone uses Mobile phone within a radius of 1.5 meters.
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Recently, we have witnessed, locally and globally, a dramatic-boom in the wireless-communications industry, hence increasing the number of mobile-devices-users. This magnified the need for developing more-efficient and reliable-means of mobile-phone-signal-detection. The following-study aimed at developing a circuit that would be able to detect any mobile-phone activities such as: sending or receiving calls and text-messages, unauthorized-audio or video-transmission or any other type of data-transmission, yet the phone is kept in the silent-mode. Overall, the results of this brief-study are potentially-useful, as the mobile-phone-transmission-detector can sense the presence of an activated-mobile-cell-phone from a distance of about 4 meters. It can therefore be potentially used to prevent use of mobile-phones in restricted and unauthorized-places, such as examination-halls, confidential and private-government meetings-venues, and business-companies-seminar-halls among others. It is also useful for detecting the use of mobile-phone for spying and unauthorized-video-transmissions. Another potential application is in hospitals and airplanes where mobile-signals might interfere with the electronic-equipment, possibly resulting in fatal-consequences and most-importantly, the circuit would also help to reduce the use of mobile-phones for terrorist-activities, thereby improving national and personal-security. The prototype, however, has a limited-range of detection, of only about 4 meters, therefore future and more-deeper-research on improvements should be conducted, so as to make the device more-efficient.
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International Journal of Advance Research, Ideas and Innovations in Technology
