Fm Jammer

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FM Transmitter as a Jammer By: Shashank Kr. Rajeev Ranjan Kiran Manandhar

07436 07438 07456

Introduction Jamming refers blocking of some frequency band in a region.

Principle Involved: Basic principle involved is to generate radio frequency signals, that originate from sources outside the original source, transmitting the same frequency and thereby masking targets of interest.

Jammer Jamming is considered an active interference source, that is initiated by elements outside the source and in general unrelated to the source's signals

Varients of Jammer • FM Jammer • Cellphone Jammer

88-108 MHz 885-960 MHz

Jammer

Capture Effect

If amplitude A1> A2, the signal received at the receiver will be A2/ A1 cos ( wct + ø(t) )

Block Diagram

Circuit Diagram

Circuit Diagram Oscillator:

Circuit Diagram Amplifier

Buffer

Circuit Diagram Signal Generation and Pre -amplification

Circuit Diagram

Application  During a hostage situation, police can control when and where a captor can make a phone call. Police can block phone calls during a drug raid so suspects can't communicate outside the area.  Cell-phone jammers can be used in areas where radio transmissions are dangerous, (areas with a potentially explosive atmosphere), such as chemical storage facilities or grain elevators.  It can be used in places like Hospitals, restaurants, movie theatres, concerts, shopping malls and churches where silence is required.

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