Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

RF Jammer basics

This page covers RF jammer basics, technical specifications, types of jamming techniques, jamming to signal ratio equation, mobile jammer block diagram and RF jammer manufacturers.

RF Jamming is the concept used to disrupt the transmission of a particular radio/satellite station so that the signal is not received/decoded properly at the receiving station.

The concept came into existence from military when one country during war situation do not want their radio transmissions to be intercepted by enemy. They use RF jammers which does jamming near border areas.

Following points should be considered for RF jammer design:

RF Jammer

• Frequency of the RF jammer should be equal to the receiving station frequency; which need to be disrupted.
• Modulation type of RF jammer should also be equal to the disrupting station.
• Power of the RF jammer should be higher than disrupting station.

There are various different approaches followed in RF jamming to prevent mobile phones from ringing in a specific region or area. It is mainly used in worship places and in national border areas or during wars. Following table mentions these different type of device. They are categorized into Type-A, Type-B, Type-C, Type-D and Type-E.


Jammer Technique Type Emergency Call Efficiency Regularity Approval Implementation
Type-A Blocked Low Not allowed Very simple
Type-B Allowed Medium Needed complex, requires third party cellular services
Type-C Allowed High Needed Complex, requires intelligent handset
Type-D Allowed Medium Needed Simple
Type-E Blocked High(No signal transmission) Allowed Simple

Based on the above types buyer can decide on which type of jammer to be purchased. Pls. refer few of the RF jammer manufacturers below.

jamming to signal ratio equation

As mentioned above, RF jamming's function is to insert an interference signal into the radio communication frequency in such a way so that actual signal (i.e. wanted signal) is completely submerged by the RF interference.

The effect of jamming signal depends upon J/S(Jamming to Signal ratio), interleaving, modulation type, channel coding technique of the target system.

Jamming to Signal ratio can be expressed by the following equation.
J/S = (Pj * Gjr * Grj * Rtr2 * Lr * Br)/(Pt * Gtr * Grt * Rjr2 *Lj * Bj)

Where,
Pj= RF Jammer Power
Pt= Transmitter power
Gjr= Antenna Gain from Jammer to the receiver
Grj= Antenna Gain from Receiver to the Jammer
Gtr=Antenna Gain from Transmitter to the receiver
Grt= Antenna Gain from Receiver to Transmitter
Br= Communications receiver Bandwidth
Bj= Jamming Transmitter Bandwidth
Rtr= Range between communication transmitter and receiver
Rjr= Range between Jammer and communication Receiver
Lj= Jammer Signal Loss, this includes polarization loss
Lr= Communication signal Loss

Mobile Jammer Block Diagram

Mobile Jammer Block Diagram

As mentioned in the block diagram above, mobile jammer consists of three main parts viz. power supply, IF section and RF section. Power supply section usually provides needed DC voltages to IF section and RF section. IF section generates IF frequency by tuning VCO module as desired. VCO is tuned by reference oscillator signal. RF section converts IF frequency to the RF frequency by using RF upconverter. This RF upconverted frequency is amplified using RF power amplifier and tra smitted using suitable RF antenna.

RF jammer manufacturers

•  SESP Group
•  Enterprise Control Systems Ltd, UK, { manufacturer of RF inhibitors or RF Jammers}
•  WolvesFleet Technology Co.,Ltd. {jammers for vehicle,stationary application, bomb jammers, cellular Jammers,RF jammers}
•  HSS Development,75 South Broadway,New York,USA. {RF jammer,cellular jammer,portable and stationary bomb jammer,prison jammer,tactical jammer etc. }

More RF Links

RF converter design
C band RF Transceiver basics
RF filter design
RF vector Signal generation/analysis
Microstrip line basics
RF and SoC Testing
rf connector
Rectangular Waveguide
RF Terminologies
what is RF
RF circulator basics
RF isolator basics

RF and Wireless Terminologies


Share this page

Translate this page