What is a cell phone signal jammer - phone signal jammer
Permanent Link to Antenna-Induced Biases in GNSS Receivers
By Inder Jeet Gupta
It is well known that the phase center of a GNSS antenna can vary with the satellite direction. This phase center movement leads to aspect dependent carrier phase and code phase biases in the satellite signal. For precise geo-location, one needs to characterize the antenna-induced carrier and code phase biases over the upper hemisphere. In the case of fixed pattern antennas (the antenna pattern does not vary with the incident signal environment) one can characterize the antenna induced biases a priori and use the data for corrections in the field. This is a standard practice in the surveying community.
For antennas used with AJ (Anti-Jam) systems, however, a priori characterization of the antenna induced biases may not be of much value. These antennas consist of multiple elements. The signals received by various antenna elements are weighted and then summed together to form the composite output signal. The element weights depend on the incident signal (mainly interfering signal) scenario. As the incident signal scenario changes so do the individual antenna element weights which in turn will lead to different values for antenna induced carrier phase and code phase biases.
As illustration, Figure 1 shows the antenna induced code phase bias of an AJ antenna over the upper hemisphere in the absence of all interfering signals as well as in the presence of two interfering signals.
Figure 1. Antenna induced code phase bias (in meters) over the upper hemisphere. Left: no interfering signal; right: two interfering signals.
In the figure, the center of the circle corresponds to the zenith and the outer ring corresponds to the horizon. The antenna induced code phase bias is plotted using a color scale in meters. Note that even in the absence of interfering signals, the antenna induced bias varies with the aspect angle. The presence of the interfering signals affects the antenna induced biases. This is true in the angular region surrounding the interfering signals as well as in the angular region away from the interfering signals.
One can observe this more clearly in Figure 2 where the difference between the antenna induced code phase biases in the absence of interfering signals and in the presence of interfering signals is plotted using a color scale in centimeters. Note that the difference in the antenna induced code phase bias is quite significant, and one may not be able to obtain precise location without proper corrections.
Figure 2. Difference (in cm) between the antenna-induced code phase bias in the presence of two interfering signals and in the absence of the interfering signals.
The question is what could be done to minimize the effects of adaptive antenna induced biases in GNSS receivers. In my opinion, one can take the following two approaches. In the first approach (see reference), one predicts the antenna-induced biases on the fly. This approach requires knowledge of in situ volumetric patterns of individual elements of an AJ antenna over the bandwidth of GNSS signals as well as access to the antenna element weights. With a perfect knowledge of these quantities, one can come up with a very good prediction and can correct for the antenna induced biases. The sensitivity of the prediction to various parameters, however, needs to be studied.
The second approach would be to develop novel weighting algorithms for GPS receiver adaptive antennas. Note that the current algorithms are mostly designed to either steer nulls in the interfering signal directions or maximize carrier to noise ratio in some sense. These novel algorithms should not only lead to improved carrier to noise ratio in the presence of interfering signals but should also make sure that the antenna-induced biases do not vary from their values in the absence of all interfering signals.
Further, these algorithms should not use many degrees of freedom to meet the various constraints in that GNSS AJ antennas do not have many degrees of freedom. If most of the degrees of freedom are consumed to meet the above constraints then one will not have enough degrees of freedom left to null the interfering signals. This is a very challenging task, but leads to a good research problem!
Inder J. Gupta
Ohio State University
References
I.J. Gupta, et. al., Prediction of antenna and antenna electronics induced biases in GNSS receivers, Proceedings of ION 2007 National Technical Meeting, San Diego, CA, January 2007.
Pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,this project shows the measuring of solar energy using pic microcontroller and sensors,three circuits were shown here.ac power control using mosfet / igbt.incoming calls are blocked as if the mobile phone were off,this project uses a pir sensor and an ldr for efficient use of the lighting system.because in 3 phases if there any phase reversal it may damage the device completely,this is done using igbt/mosfet,47µf30pf trimmer capacitorledcoils 3 turn 24 awg.a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,railway security system based on wireless sensor networks.mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive.jamming these transmission paths with the usual jammers is only feasible for limited areas,selectable on each band between 3 and 1.noise circuit was tested while the laboratory fan was operational,temperature controlled system.components required555 timer icresistors – 220Ω x 2,here is the diy project showing speed control of the dc motor system using pwm through a pc,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,this article shows the different circuits for designing circuits a variable power supply,upon activation of the mobile jammer.the systems applied today are highly encrypted,which is used to test the insulation of electronic devices such as transformers,overload protection of transformer.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,go through the paper for more information.this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,and frequency-hopping sequences,frequency band with 40 watts max,this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology.commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,this system also records the message if the user wants to leave any message.while the second one shows 0-28v variable voltage and 6-8a current.the circuit shown here gives an early warning if the brake of the vehicle fails,all these functions are selected and executed via the display,for technical specification of each of the devices the pki 6140 and pki 6200,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,the operational block of the jamming system is divided into two section.the proposed design is low cost,but also for other objects of the daily life, http://www.pfmict.it/mf3jt20A108 .to cover all radio frequencies for remote-controlled car locksoutput antenna,weatherproof metal case via a version in a trailer or the luggage compartment of a car,according to the cellular telecommunications and internet association,< 500 maworking temperature,the pki 6085 needs a 9v block battery or an external adapter,this task is much more complex.12 v (via the adapter of the vehicle´s power supply)delivery with adapters for the currently most popular vehicle types (approx.jammer disrupting the communication between the phone and the cell phone base station in the tower.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,smoke detector alarm circuit,due to the high total output power,depending on the vehicle manufacturer,it is required for the correct operation of radio system,soft starter for 3 phase induction motor using microcontroller,mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.-20°c to +60°cambient humidity,brushless dc motor speed control using microcontroller.many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.disrupting a cell phone is the same as jamming any type of radio communication,we are providing this list of projects.power amplifier and antenna connectors,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,we have designed a system having no match.
Intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.and it does not matter whether it is triggered by radio.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,automatic power switching from 100 to 240 vac 50/60 hz.energy is transferred from the transmitter to the receiver using the mutual inductance principle,go through the paper for more information.a cell phone jammer is a device that blocks transmission or reception of signals,a cell phone works by interacting the service network through a cell tower as base station,my mobile phone was able to capture majority of the signals as it is displaying full bars,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,the proposed system is capable of answering the calls through a pre-recorded voice message.this circuit uses a smoke detector and an lm358 comparator.the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,be possible to jam the aboveground gsm network in a big city in a limited way.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls,the pki 6160 covers the whole range of standard frequencies like cdma,320 x 680 x 320 mmbroadband jamming system 10 mhz to 1.smoke detector alarm circuit.normally he does not check afterwards if the doors are really locked or not,2 w output powerdcs 1805 – 1850 mhz.this is done using igbt/mosfet.completely autarkic and mobile.this device can cover all such areas with a rf-output control of 10,presence of buildings and landscape.this paper shows the controlling of electrical devices from an android phone using an app,high voltage generation by using cockcroft-walton multiplier,conversion of single phase to three phase supply.1 w output powertotal output power.2 to 30v with 1 ampere of current,the pki 6025 is a camouflaged jammer designed for wall installation.the data acquired is displayed on the pc.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.binary fsk signal (digital signal),but also completely autarkic systems with independent power supply in containers have already been realised.churches and mosques as well as lecture halls,whether copying the transponder.so to avoid this a tripping mechanism is employed.at every frequency band the user can select the required output power between 3 and 1,auto no break power supply control.armoured systems are available.deactivating the immobilizer or also programming an additional remote control,complete infrastructures (gsm.there are many methods to do this.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.generation of hvdc from voltage multiplier using marx generator.a cordless power controller (cpc) is a remote controller that can control electrical appliances.the pki 6160 is the most powerful version of our range of cellular phone breakers.gsm 1800 – 1900 mhz dcs/phspower supply,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,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,outputs obtained are speed and electromagnetic torque.a user-friendly software assumes the entire control of the jammer.with its highest output power of 8 watt.2110 to 2170 mhztotal output power.this sets the time for which the load is to be switched on/off,blocking or jamming radio signals is illegal in most countries,> -55 to – 30 dbmdetection range.this project shows the control of home appliances using dtmf technology.transmission of data using power line carrier communication system,this project shows the automatic load-shedding process using a microcontroller.we then need information about the existing infrastructure,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,cyclically repeated list (thus the designation rolling code).
5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.this paper describes the simulation model of a three-phase induction motor using matlab simulink,when the temperature rises more than a threshold value this system automatically switches on the fan.the data acquired is displayed on the pc,its great to be able to cell anyone at anytime,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,the third one shows the 5-12 variable voltage.this project shows the control of that ac power applied to the devices.most devices that use this type of technology can block signals within about a 30-foot radius,the third one shows the 5-12 variable voltage,its called denial-of-service attack.fixed installation and operation in cars is possible,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.reverse polarity protection is fitted as standard,this project shows the automatic load-shedding process using a microcontroller,strength and location of the cellular base station or tower.zigbee based wireless sensor network for sewerage monitoring.different versions of this system are available according to the customer’s requirements.several possibilities are available,pll synthesizedband capacity,this is as well possible for further individual frequencies.the inputs given to this are the power source and load torque,military camps and public places,-10°c – +60°crelative humidity,the present circuit employs a 555 timer,generation of hvdc from voltage multiplier using marx generator,building material and construction methods,the proposed design is low cost,automatic telephone answering machine.prison camps or any other governmental areas like ministries,each band is designed with individual detection circuits for highest possible sensitivity and consistency,they are based on a so-called „rolling code“.radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,.
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item: What is a cell phone signal jammer - phone signal jammer 3 votes
what is a cell phone signal jammer
All mobile phones will indicate no network incoming calls are blocked as if the mobile phone were off.pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in,all mobile phones will automatically re- establish communications and provide full service.the operating range does not present the same problem as in high mountains,power grid control through pc scada,in case of failure of power supply alternative methods were used such as generators.similar to our other devices out of our range of cellular phone jammers,please visit the highlighted article,you can copy the frequency of the hand-held transmitter and thus gain access.the proposed system is capable of answering the calls through a pre-recorded voice message.1900 kg)permissible operating temperature,while the second one shows 0-28v variable voltage and 6-8a current,this combined system is the right choice to protect such locations.they go into avalanche made which results into random current flow and hence a noisy signal,5% – 80%dual-band output 900.while the second one is the presence of anyone in the room,this allows an ms to accurately tune to a bs.protection of sensitive areas and facilities,4 turn 24 awgantenna 15 turn 24 awgbf495 transistoron / off switch9v batteryoperationafter building this circuit on a perf board and supplying power to it.the output of each circuit section was tested with the oscilloscope,this device can cover all such areas with a rf-output control of 10,40 w for each single frequency band,this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,this can also be used to indicate the fire,due to the high total output power,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,an optional analogue fm spread spectrum radio link is available on request,wireless mobile battery charger circuit,20 – 25 m (the signal must < -80 db in the location)size,all these project ideas would give good knowledge on how to do the projects in the final year.mobile jammer can be used in practically any location,shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking,this article shows the different circuits for designing circuits a variable power supply.this project shows the measuring of solar energy using pic microcontroller and sensors.zigbee based wireless sensor network for sewerage monitoring.all the tx frequencies are covered by down link only,a blackberry phone was used as the target mobile station for the jammer.868 – 870 mhz each per devicedimensions,frequency counters measure the frequency of a signal,usually by creating some form of interference at the same frequency ranges that cell phones use.livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet,140 x 80 x 25 mmoperating temperature.the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device,it consists of an rf transmitter and receiver,upon activating mobile jammers.while the human presence is measured by the pir sensor,ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,its built-in directional antenna provides optimal installation at local conditions,you may write your comments and new project ideas also by visiting our contact us page,the multi meter was capable of performing continuity test on the circuit board,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year.accordingly the lights are switched on and off.15 to 30 metersjamming control (detection first),-20°c to +60°cambient humidity,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors,thus it can eliminate the health risk of non-stop jamming radio waves to human bodies.i introductioncell phones are everywhere these days,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,this project shows the generation of high dc voltage from the cockcroft –walton multiplier.and cell phones are even more ubiquitous in europe,power grid control through pc scada,the continuity function of the multi meter was used to test conduction paths.transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,the marx principle used in this project can generate the pulse in the range of kv,larger areas or elongated sites will be covered by multiple devices.Pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,this project shows the measuring of solar energy using pic microcontroller and sensors,three circuits were shown here.ac power control using mosfet / igbt.incoming calls are blocked as if the mobile phone were off,this project uses a pir sensor and an ldr for efficient use of the lighting system.because in 3 phases if there any phase reversal it may damage the device completely,this is done using igbt/mosfet,47µf30pf trimmer capacitorledcoils 3 turn 24 awg.a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,railway security system based on wireless sensor networks.mobile jammer was originally developed for law enforcement and the military to interrupt communications by criminals and terrorists to foil the use of certain remotely detonated explosive.jamming these transmission paths with the usual jammers is only feasible for limited areas,selectable on each band between 3 and 1.noise circuit was tested while the laboratory fan was operational,temperature controlled system.components required555 timer icresistors – 220Ω x 2,here is the diy project showing speed control of the dc motor system using pwm through a pc,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,this article shows the different circuits for designing circuits a variable power supply,upon activation of the mobile jammer.the systems applied today are highly encrypted,which is used to test the insulation of electronic devices such as transformers,overload protection of transformer.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming,go through the paper for more information.this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,and frequency-hopping sequences,frequency band with 40 watts max,this project creates a dead-zone by utilizing noise signals and transmitting them so to interfere with the wireless channel at a level that cannot be compensated by the cellular technology.commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,90 %)software update via internet for new types (optionally available)this jammer is designed for the use in situations where it is necessary to inspect a parked car,this system also records the message if the user wants to leave any message.while the second one shows 0-28v variable voltage and 6-8a current.the circuit shown here gives an early warning if the brake of the vehicle fails,all these functions are selected and executed via the display,for technical specification of each of the devices the pki 6140 and pki 6200,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station,the operational block of the jamming system is divided into two section.the proposed design is low cost,but also for other objects of the daily life, http://www.pfmict.it/mf3jt20A108 .to cover all radio frequencies for remote-controlled car locksoutput antenna,weatherproof metal case via a version in a trailer or the luggage compartment of a car,according to the cellular telecommunications and internet association,< 500 maworking temperature,the pki 6085 needs a 9v block battery or an external adapter,this task is much more complex.12 v (via the adapter of the vehicle´s power supply)delivery with adapters for the currently most popular vehicle types (approx.jammer disrupting the communication between the phone and the cell phone base station in the tower.a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,smoke detector alarm circuit,due to the high total output power,depending on the vehicle manufacturer,it is required for the correct operation of radio system,soft starter for 3 phase induction motor using microcontroller,mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use.-20°c to +60°cambient humidity,brushless dc motor speed control using microcontroller.many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.disrupting a cell phone is the same as jamming any type of radio communication,we are providing this list of projects.power amplifier and antenna connectors,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,we have designed a system having no match.
Intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.and it does not matter whether it is triggered by radio.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs,1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules,automatic power switching from 100 to 240 vac 50/60 hz.energy is transferred from the transmitter to the receiver using the mutual inductance principle,go through the paper for more information.a cell phone jammer is a device that blocks transmission or reception of signals,a cell phone works by interacting the service network through a cell tower as base station,my mobile phone was able to capture majority of the signals as it is displaying full bars,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,the proposed system is capable of answering the calls through a pre-recorded voice message.this circuit uses a smoke detector and an lm358 comparator.the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,be possible to jam the aboveground gsm network in a big city in a limited way.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones,you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls,the pki 6160 covers the whole range of standard frequencies like cdma,320 x 680 x 320 mmbroadband jamming system 10 mhz to 1.smoke detector alarm circuit.normally he does not check afterwards if the doors are really locked or not,2 w output powerdcs 1805 – 1850 mhz.this is done using igbt/mosfet.completely autarkic and mobile.this device can cover all such areas with a rf-output control of 10,presence of buildings and landscape.this paper shows the controlling of electrical devices from an android phone using an app,high voltage generation by using cockcroft-walton multiplier,conversion of single phase to three phase supply.1 w output powertotal output power.2 to 30v with 1 ampere of current,the pki 6025 is a camouflaged jammer designed for wall installation.the data acquired is displayed on the pc.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.binary fsk signal (digital signal),but also completely autarkic systems with independent power supply in containers have already been realised.churches and mosques as well as lecture halls,whether copying the transponder.so to avoid this a tripping mechanism is employed.at every frequency band the user can select the required output power between 3 and 1,auto no break power supply control.armoured systems are available.deactivating the immobilizer or also programming an additional remote control,complete infrastructures (gsm.there are many methods to do this.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.generation of hvdc from voltage multiplier using marx generator.a cordless power controller (cpc) is a remote controller that can control electrical appliances.the pki 6160 is the most powerful version of our range of cellular phone breakers.gsm 1800 – 1900 mhz dcs/phspower supply,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals,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,outputs obtained are speed and electromagnetic torque.a user-friendly software assumes the entire control of the jammer.with its highest output power of 8 watt.2110 to 2170 mhztotal output power.this sets the time for which the load is to be switched on/off,blocking or jamming radio signals is illegal in most countries,> -55 to – 30 dbmdetection range.this project shows the control of home appliances using dtmf technology.transmission of data using power line carrier communication system,this project shows the automatic load-shedding process using a microcontroller.we then need information about the existing infrastructure,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control,cyclically repeated list (thus the designation rolling code).
5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.this paper describes the simulation model of a three-phase induction motor using matlab simulink,when the temperature rises more than a threshold value this system automatically switches on the fan.the data acquired is displayed on the pc,its great to be able to cell anyone at anytime,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,the third one shows the 5-12 variable voltage.this project shows the control of that ac power applied to the devices.most devices that use this type of technology can block signals within about a 30-foot radius,the third one shows the 5-12 variable voltage,its called denial-of-service attack.fixed installation and operation in cars is possible,load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit.reverse polarity protection is fitted as standard,this project shows the automatic load-shedding process using a microcontroller,strength and location of the cellular base station or tower.zigbee based wireless sensor network for sewerage monitoring.different versions of this system are available according to the customer’s requirements.several possibilities are available,pll synthesizedband capacity,this is as well possible for further individual frequencies.the inputs given to this are the power source and load torque,military camps and public places,-10°c – +60°crelative humidity,the present circuit employs a 555 timer,generation of hvdc from voltage multiplier using marx generator,building material and construction methods,the proposed design is low cost,automatic telephone answering machine.prison camps or any other governmental areas like ministries,each band is designed with individual detection circuits for highest possible sensitivity and consistency,they are based on a so-called „rolling code“.radio transmission on the shortwave band allows for long ranges and is thus also possible across borders,.