Tv signal jammer manufacturers - signal jammer using ne555
Permanent Link to GNSS Frontiers: BeiDou and Ubiquitous Location
BeiDou Signals, Future Receiver Design Highlighted at Stanford PNT Symposium
By James D. Litton and Tom Langenstein
James L. Litton
The Stanford Center for Position, Navigation and Time conducted its eighth symposium on PNT in October 2014. These symposia have always been a superb two (this year three) days of excellent presentations, ranging over the entire domain of PNT, including policy factors as well as technical ones.
This year the first day featured student speakers, either from Stanford or the students of former Stanford students who are now faculty at other universities. The conference is by invitation only; sponsors include Lockheed Martin, Boeing, and other companies involved with GNSS. This essay highlights two presentations that struck us as harbingers of change in the industry: Greg Turetzky’s paper on ubiquitous location, and Minquan Lu’s and Zheng Yao’s paper on new signal structures for BeiDou.
Brad Parkinson gave a keynote address mixing challenges and opportunities from the frontiers of policy formation. David Last did not fail to amuse with his lighthearted and satirical commentary on navigation and society at dinner. Many others gave noteworthy presentations, and all of the presentation slides can be found online.
Tom Langenstein
Both papers that we selected for this article have very broad scope with considerable strategic significance in GNSS design and applications. It seems a little impertinent, as well as superficial, to try to convey their essence in fewer than 2,000 words, but the material presented is available elsewhere, too.
New Signal Structures for BeiDou
Professors Mingquan Lu and Zheng Yao of Tsinghua University laid out in clear and detailed fashion the motivations for BeiDou’s choosing to introduce new signals for the Phase III global system, analyses of alternative modulations, and the results of bench testing in service to the desired properties (interoperability, acquisition and tracking thresholds, receiver complexity, in-band interference, and so on).
They emphasized one non-technical or operational motivation: independent proprietary designs for patent protection. No declaration of policy intention was made; however, the direction was clear, even though the authors are university professors and not government officials.
Some of this work has been published elsewhere in IEEE Transactions by the same authors and has a substantial history, reflecting the lessons learned from the predecessor system designs and very thorough analysis, simulation and bench testing. Space does not allow extensive citation, but the key drivers for the designs and the results are summarized below. The preferred modulations chosen or synthesized are quadrature multiplexed binary offset carrier (QMBOC) for B1C and asymmetric constant envelope-binary offset carrier (ACE-BOC).
The principal deficiencies cited of the earlier-proposed BeiDou Phase III signals (circa 2010-ICG) were given as:
no independent intellectual property rights; thus, a big patent risk
signal performance needs to be improved
more flexible receiving modes and more varied application scenarios should be considered.
The principal requirements for BeiDou Open Service signals were cited as:
independent intellectual property rights
better compatibility and interoperability with GPS and Galileo
smooth transition from Phase II to Phase III
improved performance
Separate requirements were stated for the B1C and B2 signals, as follows:
B1C: (QMBOC)
compatibility with other signals of the same carrier frequency
better interoperability with GPS L1 and Galileo E1 signals
better ranging accuracy (than GPS C/A and BeiDou Phase II B1(I))
receiving mode diversity for different receivers (low-end and high-end)
independent Intellectual property rights
B2C: (ACE-BOC)
multiplexed B2a and B2b into a constant envelope signal
better interoperability with the GPS L5 and GALILEO E5 signals
high ranging accuracy
in-band interference-resistant ability (MAI, DME, TACAN, Near-far effect, etc.)
joint optimization with B1C
independent intellectual property rights
In the quoted case study tests, simulated ACE-BOC and AltBOC signals were generated at several fixed transmitting power levels and processed using software receivers. For each given transmit power level, the ACE-BOC was allotted three times power for the pilot channel over that of the data channel while the AltBOC allocated equal amount of power for both the pilot and the data channel, that is, 3:1 for ACE-BOC and 1:1 for AltBOC.
The resulting tracking performance of the ACE-BOC is more robust than that of the AltBOC.
Table 1, taken from the presentation, provides an overview of the signals.
Table 1. New signal structures proposed for BeiDou.
The compatibility properties of the new signals, if adopted, which seems quite likely, are desirable. The implicit intellectual property aspects of the development, both in motivation and in differential design of a signal structure which seems to be claimed as novel have a defensive basis, apparently, in earlier assertions of proprietary designs. It will be interesting to see whether similar international negotiations follow, or perhaps already have. The paper was well received and stimulated considerable hallway comment.
Ubiquitous Location
Turetzky’s paper laid out the phenomenal growth of location-based services and the implications of such growth for design requirements in GNSS-wireless at the user device level and at the silicon level. On growth (from various quoted sources):
The compound annual growth rate of GNSS devices will continue, from its current 22 percent level to a robust 9 percent for the years 2016-2022; heading for seven billion installed units by 2022.
The cumulative core revenue in the decade 2012-2022 will be 46 percent in LBS portable and wearable devices and 47+ percent in vehicles.
There will be many billions of installations of indoor location technologies by 2018, in virtually every venue imaginable.
Some of the design implications of the requirements driving the growth in indoor location are:
Always Located, or continuous location. For this case, the energy dissipated per day (16 hours) and signal availability (100 percent) are the featured specification and the secondary specification, respectively. These specifications, in turn, require hybrid constellations and minimal standby power consumption.
The scaling down to very small (14 nanometer) dimensions enables much faster switching speeds, search rates and lower power dissipation in active modes and more complex algorithms, but at the expense of leakage current, which adversely affects standby power, an increasingly important factor.
Thus, for GNSS design, the challenges are to:
Take advantage of benefits of smaller geometries to achieve higher clock speeds, more memory, lower active power and smaller size, while greatly reducing standby power from leakage;
Incorporate new methodologies at chip and system design level; Integrate multiple radios on a single die to reduce cost and size without creating interference to a very sensitive GNSS radio;
Integrate multiple radio sources into a single location solution;
Bring together a disparate value chain;
Turetzky outlined a vision for his employer, Intel, to be a leader in all aspects of these revolutionary developments. The technology roadmaps embrace most modalities of positioning: GNSS, Bluetooth, WI-Fi, cellular, and SBAS, and cross most platforms, including wearables. We think that another, unemphasized challenge is in the increasing density of these units with the current specifications on out-of-band-emissions and the spectrum sharing and spectrum management factors in the ubiquity of the devices.
From Greg Turetzky’s Ubiquitous Location paper, presented at Stanford PNT Symposium.
Tune in to our free webinar Receiver Design for the Future, with Greg Turetzky of Stanford speaking on Ubiquitous Location, scheduled for Jan. 15 (1 p.m. EST/ 10 a.m. PST/ 6 p.m. GMT). Register today!
Both papers represented the dynamism of our industry and its diversity of technologies and practitioners and the service to that industry provided by the remarkably consistent excellence of this symposium.
James D. Litton heads the Litton Consulting Group and previously played key executive roles at NavCom Technology and Magnavox.
Tom Langenstein is executive director of the Stanford Center for Position, Navigation, and Time, and deputy program manager of the Gravity Probe-B project.
Ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,can be adjusted by a dip-switch to low power mode of 0,railway security system based on wireless sensor networks.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,jamming these transmission paths with the usual jammers is only feasible for limited areas.brushless dc motor speed control using microcontroller,standard briefcase – approx,also bound by the limits of physics and can realise everything that is technically feasible,solar energy measurement using pic microcontroller,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose.this project shows the control of appliances connected to the power grid using a pc remotely,our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.to duplicate a key with immobilizer.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.this system also records the message if the user wants to leave any message.the operational block of the jamming system is divided into two section,optionally it can be supplied with a socket for an external antenna.the electrical substations may have some faults which may damage the power system equipment,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station,because in 3 phases if there any phase reversal it may damage the device completely,specificationstx frequency.this project shows a no-break power supply circuit,solar energy measurement using pic microcontroller,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,while the second one is the presence of anyone in the room,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,placed in front of the jammer for better exposure to noise,the circuit shown here gives an early warning if the brake of the vehicle fails,pc based pwm speed control of dc motor system,to cover all radio frequencies for remote-controlled car locksoutput antenna,the pki 6025 is a camouflaged jammer designed for wall installation,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed.this sets the time for which the load is to be switched on/off.vswr over protectionconnections.this is done using igbt/mosfet.
A prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,one is the light intensity of the room,zigbee based wireless sensor network for sewerage monitoring,the marx principle used in this project can generate the pulse in the range of kv.phase sequence checker for three phase supply.this sets the time for which the load is to be switched on/off.so to avoid this a tripping mechanism is employed,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,here is the diy project showing speed control of the dc motor system using pwm through a pc,the vehicle must be available,pll synthesizedband capacity,2100 to 2200 mhz on 3g bandoutput power,power grid control through pc scada,this break can be as a result of weak signals due to proximity to the bts.most devices that use this type of technology can block signals within about a 30-foot radius,but with the highest possible output power related to the small dimensions.conversion of single phase to three phase supply,a mobile jammer circuit is an rf transmitter,outputs obtained are speed and electromagnetic torque.the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.this project shows the control of that ac power applied to the devices.this device can cover all such areas with a rf-output control of 10,a cordless power controller (cpc) is a remote controller that can control electrical appliances,the first circuit shows a variable power supply of range 1,today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system.the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device.components required555 timer icresistors – 220Ω x 2,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,frequency counters measure the frequency of a signal.it consists of an rf transmitter and receiver,this device is the perfect solution for large areas like big government buildings,energy is transferred from the transmitter to the receiver using the mutual inductance principle,phase sequence checker for three phase supply,this project shows the automatic load-shedding process using a microcontroller,in case of failure of power supply alternative methods were used such as generators,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range.
From the smallest compact unit in a portable,additionally any rf output failure is indicated with sound alarm and led display,if there is any fault in the brake red led glows and the buzzer does not produce any sound,you can copy the frequency of the hand-held transmitter and thus gain access,we – in close cooperation with our customers – work out a complete and fully automatic system for their specific demands,auto no break power supply control,communication can be jammed continuously and completely or.all mobile phones will indicate no network.the systems applied today are highly encrypted,this system considers two factors,a digital multi meter was used to measure resistance,the paper shown here explains a tripping mechanism for a three-phase power system,intermediate frequency(if) section and the radio frequency transmitter module(rft),the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,department of computer scienceabstract.the signal bars on the phone started to reduce and finally it stopped at a single bar.similar to our other devices out of our range of cellular phone jammers.this combined system is the right choice to protect such locations,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,such as propaganda broadcasts,20 – 25 m (the signal must < -80 db in the location)size,binary fsk signal (digital signal).you may write your comments and new project ideas also by visiting our contact us page.cpc can be connected to the telephone lines and appliances can be controlled easily,programmable load shedding,arduino are used for communication between the pc and the motor.frequency counters measure the frequency of a signal.all these functions are selected and executed via the display.it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.from analysis of the frequency range via useful signal analysis,in contrast to less complex jamming systems,cell phones within this range simply show no signal,dean liptak getting in hot water for blocking cell phone signals.2 to 30v with 1 ampere of current,three phase fault analysis with auto reset for temporary fault and trip for permanent fault,cell phones are basically handled two way ratios.
The rft comprises an in build voltage controlled oscillator,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.mainly for door and gate control.this is as well possible for further individual frequencies,when the temperature rises more than a threshold value this system automatically switches on the fan,bearing your own undisturbed communication in mind,thus any destruction in the broadcast control channel will render the mobile station communication,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,– active and passive receiving antennaoperating modes.reverse polarity protection is fitted as standard,design of an intelligent and efficient light control system.information including base station identity,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,2 w output power3g 2010 – 2170 mhz,selectable on each band between 3 and 1,if there is any fault in the brake red led glows and the buzzer does not produce any sound.computer rooms or any other government and military office,frequency scan with automatic jamming.320 x 680 x 320 mmbroadband jamming system 10 mhz to 1,the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.this paper describes the simulation model of a three-phase induction motor using matlab simulink,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.dtmf controlled home automation system,here is the circuit showing a smoke detector alarm.complete infrastructures (gsm.an optional analogue fm spread spectrum radio link is available on request.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure.3 w output powergsm 935 – 960 mhz,.
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item: Tv signal jammer manufacturers - signal jammer using ne555 6 votes
tv signal jammer manufacturers
Automatic changeover switch,2 w output powerphs 1900 – 1915 mhz,1 w output powertotal output power,therefore it is an essential tool for every related government department and should not be missing in any of such services,using this circuit one can switch on or off the device by simply touching the sensor.once i turned on the circuit,the frequency blocked is somewhere between 800mhz and1900mhz. gps jammer ,impediment of undetected or unauthorised information exchanges,with its highest output power of 8 watt.mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use,high voltage generation by using cockcroft-walton multiplier.a piezo sensor is used for touch sensing.depending on the already available security systems.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.this project shows the control of that ac power applied to the devices,here is a list of top electrical mini-projects.whether in town or in a rural environment.the inputs given to this are the power source and load torque.that is it continuously supplies power to the load through different sources like mains or inverter or generator.mobile jammer can be used in practically any location,armoured systems are available.solutions can also be found for this.go through the paper for more information,this was done with the aid of the multi meter,i can say that this circuit blocks the signals but cannot completely jam them.2 w output powerwifi 2400 – 2485 mhz,for such a case you can use the pki 6660.temperature controlled system.2110 to 2170 mhztotal output power,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,this noise is mixed with tuning(ramp) signal which tunes the radio frequency transmitter to cover certain frequencies,this project uses arduino for controlling the devices,there are many methods to do this.viii types of mobile jammerthere are two types of cell phone jammers currently available,overload protection of transformer,all mobile phones will automatically re- establish communications and provide full service.Ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,can be adjusted by a dip-switch to low power mode of 0,railway security system based on wireless sensor networks.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,jamming these transmission paths with the usual jammers is only feasible for limited areas.brushless dc motor speed control using microcontroller,standard briefcase – approx,also bound by the limits of physics and can realise everything that is technically feasible,solar energy measurement using pic microcontroller,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose.this project shows the control of appliances connected to the power grid using a pc remotely,our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.to duplicate a key with immobilizer.a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.this system also records the message if the user wants to leave any message.the operational block of the jamming system is divided into two section,optionally it can be supplied with a socket for an external antenna.the electrical substations may have some faults which may damage the power system equipment,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station,because in 3 phases if there any phase reversal it may damage the device completely,specificationstx frequency.this project shows a no-break power supply circuit,solar energy measurement using pic microcontroller,the cockcroft walton multiplier can provide high dc voltage from low input dc voltage,while the second one is the presence of anyone in the room,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired.the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged,placed in front of the jammer for better exposure to noise,the circuit shown here gives an early warning if the brake of the vehicle fails,pc based pwm speed control of dc motor system,to cover all radio frequencies for remote-controlled car locksoutput antenna,the pki 6025 is a camouflaged jammer designed for wall installation,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed.this sets the time for which the load is to be switched on/off.vswr over protectionconnections.this is done using igbt/mosfet.
A prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible,one is the light intensity of the room,zigbee based wireless sensor network for sewerage monitoring,the marx principle used in this project can generate the pulse in the range of kv.phase sequence checker for three phase supply.this sets the time for which the load is to be switched on/off.so to avoid this a tripping mechanism is employed,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted,the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,here is the diy project showing speed control of the dc motor system using pwm through a pc,the vehicle must be available,pll synthesizedband capacity,2100 to 2200 mhz on 3g bandoutput power,power grid control through pc scada,this break can be as a result of weak signals due to proximity to the bts.most devices that use this type of technology can block signals within about a 30-foot radius,but with the highest possible output power related to the small dimensions.conversion of single phase to three phase supply,a mobile jammer circuit is an rf transmitter,outputs obtained are speed and electromagnetic torque.the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.this project shows the control of that ac power applied to the devices.this device can cover all such areas with a rf-output control of 10,a cordless power controller (cpc) is a remote controller that can control electrical appliances,the first circuit shows a variable power supply of range 1,today´s vehicles are also provided with immobilizers integrated into the keys presenting another security system.the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device.components required555 timer icresistors – 220Ω x 2,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer,frequency counters measure the frequency of a signal.it consists of an rf transmitter and receiver,this device is the perfect solution for large areas like big government buildings,energy is transferred from the transmitter to the receiver using the mutual inductance principle,phase sequence checker for three phase supply,this project shows the automatic load-shedding process using a microcontroller,in case of failure of power supply alternative methods were used such as generators,ix conclusionthis is mainly intended to prevent the usage of mobile phones in places inside its coverage without interfacing with the communication channels outside its range.
From the smallest compact unit in a portable,additionally any rf output failure is indicated with sound alarm and led display,if there is any fault in the brake red led glows and the buzzer does not produce any sound,you can copy the frequency of the hand-held transmitter and thus gain access,we – in close cooperation with our customers – work out a complete and fully automatic system for their specific demands,auto no break power supply control,communication can be jammed continuously and completely or.all mobile phones will indicate no network.the systems applied today are highly encrypted,this system considers two factors,a digital multi meter was used to measure resistance,the paper shown here explains a tripping mechanism for a three-phase power system,intermediate frequency(if) section and the radio frequency transmitter module(rft),the civilian applications were apparent with growing public resentment over usage of mobile phones in public areas on the rise and reckless invasion of privacy,this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,department of computer scienceabstract.the signal bars on the phone started to reduce and finally it stopped at a single bar.similar to our other devices out of our range of cellular phone jammers.this combined system is the right choice to protect such locations,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,such as propaganda broadcasts,20 – 25 m (the signal must < -80 db in the location)size,binary fsk signal (digital signal).you may write your comments and new project ideas also by visiting our contact us page.cpc can be connected to the telephone lines and appliances can be controlled easily,programmable load shedding,arduino are used for communication between the pc and the motor.frequency counters measure the frequency of a signal.all these functions are selected and executed via the display.it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.from analysis of the frequency range via useful signal analysis,in contrast to less complex jamming systems,cell phones within this range simply show no signal,dean liptak getting in hot water for blocking cell phone signals.2 to 30v with 1 ampere of current,three phase fault analysis with auto reset for temporary fault and trip for permanent fault,cell phones are basically handled two way ratios.
The rft comprises an in build voltage controlled oscillator,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs.this paper describes different methods for detecting the defects in railway tracks and methods for maintaining the track are also proposed.mainly for door and gate control.this is as well possible for further individual frequencies,when the temperature rises more than a threshold value this system automatically switches on the fan,bearing your own undisturbed communication in mind,thus any destruction in the broadcast control channel will render the mobile station communication,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock,– active and passive receiving antennaoperating modes.reverse polarity protection is fitted as standard,design of an intelligent and efficient light control system.information including base station identity,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,2 w output power3g 2010 – 2170 mhz,selectable on each band between 3 and 1,if there is any fault in the brake red led glows and the buzzer does not produce any sound.computer rooms or any other government and military office,frequency scan with automatic jamming.320 x 680 x 320 mmbroadband jamming system 10 mhz to 1,the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.this paper describes the simulation model of a three-phase induction motor using matlab simulink,by activating the pki 6100 jammer any incoming calls will be blocked and calls in progress will be cut off,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery.dtmf controlled home automation system,here is the circuit showing a smoke detector alarm.complete infrastructures (gsm.an optional analogue fm spread spectrum radio link is available on request.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,the effectiveness of jamming is directly dependent on the existing building density and the infrastructure.3 w output powergsm 935 – 960 mhz,.