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    What do you mean by a Walkie talkie ?

    Walkie talkie more formally mentioned as a handheld transceiver, could also be a hand-held, portable, two-way radio transreceiver. Its development during the Second war has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola. First used for infantry, similar designs were created for field artillery and tank units, and after the war, walkie-talkies spread to public safety and eventually commercial and jobsite work

    Typical walkie-talkies resemble a telephone handset, with a speaker built into one end and a microphone within the opposite (in some devices the speaker is additionally used because the microphone) and an antenna mounted on the very best of the unit. they’re delayed to the face to talk . A walkie-talkie could also be a half-duplex communication device. Multiple walkie-talkies use one radio channel, and only one radio on the channel can transmit at a time, although any number can listen. The transceiver is usually in receive mode; when the user wants to talk they have to press a “push-to-talk” (PTT) button that turns off the receiver and activates the transmitter. Smaller versions of this device are also very fashionable among young children

    What is a Base station?

    A base transceiver station (BTS) may be a piece of kit that facilitates wireless communication between user equipment (UE) and a network. UEs are devices like mobile phones (handsets), WLL phones, computers with wireless Internet connectivity. The network are often that of any of the wireless communication technologies like GSM, CDMA, wireless local loop, Wi-Fi, WiMAX or other wide area network (WAN) technology.

    BTS is additionally mentioned because the node B (in 3G networks) or, simply, the bottom station (BS). For discussion of the LTE standard the abbreviation eNB for evolved node B is widely used.

    Though the term BTS are often applicable to any of the wireless communication standards, it’s generally related to mobile communication technologies like GSM and CDMA. during this regard, a BTS forms a part of the bottom station subsystem; developments for system management. it’s going to even have equipment for encrypting and decrypting communications, spectrum filtering tools (band pass filters) then on. Antennas can also be considered as components of BTS generally sense as they facilitate the functioning of BTS. Typically a BTS will have several transceivers (TRXs) which permit it to serve several different frequencies and different sectors of the cell (in the case of sectorised base stations). A BTS is controlled by a parent base station controller via the bottom station control operation (BCF). The BCF is implemented as a discrete unit or maybe incorporated during a TRX in compact base stations. The BCF provides an operations and maintenance (O&M) connection to the network management system, and manages operational states of every TRX, also as software handling and alarm collection. the essential structure and functions of the BTS remains an equivalent no matter the wireless technologies.

    What is Breathalyzer ?

    A breathalyzer is an device for measuring the breath alcohol content from an individual . breath alcohol content are often wont to accurately measure an individual’s blood alcohol content.
    There is an immediate correlation between an individual’s breath alcohol contents and his blood alcohol concentration. During respiration, alcohol within the blood vaporizes and is administered of the lungs within the exhaled breath. There are several sorts of breath alcohol testers available today. These range from disposable screening testers to the equipment that gives legally admissible results.

    Portable hand-held breathalyzers provide very accurate results and are used for screening purposes. By measuring the alcohol content within the breath, a reliable indication of the blood alcohol level is achieved. Portables alcohol testers are less accurate than evidential devices, however by comparing the value performance ratio, these devices are affordable and sufficient for private usage.

    What is Mobile signal jammer and how does it works ?

    A mobile signal jammer is an instrument wont to protect the cell phones from the receiving signal. The mobile jammer device broadcasts the signal of an equivalent frequency to the GSM modem. The jamming is claimed to achieve success when the mobile signals are disabled during a location if the mobile signal jammer is enabled.

    The mobile signal jammer may be a device that transmits the signals to an equivalent frequency. The jamming section is successful when the world of the mobile signal is disabled if the jammer is on. the primary jamming device was developed and employed by the military for communication purposes. Where the planed commanders use RF communication to regulate their power and also in enemy communications.

    What is a Door frame metal detector and it’s uses ?

    A detector is an instrument which detects the presence of metal. Metal detectors are useful for locating metal hidden within objects, or metal objects buried underground. A Door Frame detector (DFMD) because the name suggests may be a detector fitted during a door to detect metal which will be hidden on the body of the person passing through this door. this is often also referred to as a “walk through” detector . These are used for security screening at access points in prisons, courthouses, and at airports to detect concealed metal weapons on a person’s body.

    The simplest sort of a detector consists of an oscillator producing an AC that passes through a coil producing an alternating magnetic flux . If a bit of electrically conductive metal is on the brink of the coil, eddy currents are going to be induced within the metal, and this produces a magnetic flux of its own.

    The biggest technical change in detectors was the event of the induction-balance system. this technique involves two coils that are electrically balanced. When metal is introduced to their vicinity, they might become unbalanced. What allowed detectors to discriminate between metals was the very fact that each metal features a different phase response when exposed to AC .

    Door Frame metal detectors (DFMDs) are of two types:

    • Single zone DFMD
    • Multi-zone DFMD provide multi zone detection

    Door frame metal detectors are with higher sensitivity they will be utilized in the Jewellery manufacturing units to guard against pilferage. Use of such DFMD’s increases safety in prisons and jails by efficiently detecting small metal objects which will be used as weapons, even once they are hidden in body cavities. they’re also deployed in manufacturing and distribution facilities to guard small, valuable assets.

    What do u mean by Two-way radio?

    A two-way radio may be a radio which will both transmit and receive radio waves (a transceiver), unlike a broadcast receiver which only receives content. it’s an audio (sound) transceiver, a transmitter and receiver in one unit, used for bidirectional person-to-person speech with other users with similar radios. Two-way radios are available in stationary (base station), mobile (installed in vehicles), and hand-held portable models. Hand-held two-way radios are often called walkie-talkies, handie-talkies or hand-helds. Two-way radios are employed by groups of geographically separated people that got to confine continuous speech , like aircraft pilots and traffic controllers, ship captains and harbormasters, emergency services personnel like firemen, policemen, and ambulance paramedics, taxi and delivery services, soldiers and military units, nutriment and warehouse employees, and radio amateurs.

    Two-way radio systems usually use one radio channel and operate during a half-duplex mode: just one user on the channel can transmit at a time, so users during a user group must alternate talking. The radio is generally in receive mode therefore the user can hear all other transmissions on the channel. When the user wants to speak he presses a “push-to-talk” button, which turns off the receiver and activates the transmitter; when he releases the button the receiver is activated again. Multiple channels are provided so separate user groups can communicate within the same area without interfering with one another . Other two-way radio systems operate in full-duplex mode, during which both parties can talk simultaneously. this needs either two separate radio channels or channel sharing methods like time division duplex (TDD) to hold the 2 directions of the conversation simultaneously on one frequency . A telephone is an example of a full-duplex two-way radio. During a call , the phone communicates with the cell tower over two radio channels; an incoming one to hold the remote party’s voice to the user, and an outgoing one to hold the user’s voice to the remote party.

    What is a Repeater Station?

    A radio repeater may be a combination of a receiving set and a transmitter that receives a sign and retransmits it, in order that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of every other, to speak .Repeaters are found in professional, commercial, and government mobile radio systems and also in amateur radio.

    Repeater systems use two different radio frequencies; the mobiles transmit on one frequency, and therefore the repeater station receives those transmission and transmits on a second frequency. Since the repeater must transmit at an equivalent time because the signal is being received, and should even use an equivalent antenna for both transmitting and receiving, frequency-selective filters are required to stop the receiver from being overloaded by the transmitted signal. Some repeaters use two different frequency bands to supply isolation between input and output or as a convenience.

    What is Alcohol detector and how it works ?

    Alcohol detector is a devide used to measure the alcohol account in your blood.

    To get a blood alcohol content (BAC) reading, the users simply need to blow into a straw attached to the equipment for a couple of seconds. From here, the machine utilises the vapours in your breath to calculate an estimation of the extent of alcohol during a person’s system. this easy approach is thanks to the very fact that alcohol isn’t digested by the body and is simply absorbed through different parts. These include the mouth, stomach and intestines. As a result, traces of the fabric can still be identified minutes after drinking, making it possible for the Breath Analyser to calculate an accurate number.

    What is Mobile signal booster and how does it works ?

    A mobile signal booster is formed from three main elements – exterior antenna, amplifier, and interior antenna. They form a wireless system to spice up cellular reception. we’ll explain how it helps improve cellphone signal strength, and show sorts of mobile amplifiers available so you’ll make an informed decision.

    A Mobile signal booster is usually a repeater system that involves the amplifier adding gain or power to the reception in various directions. Even for an inexpensive telephone signal booster, maximum gain differs by application. The work of an outdoor antenna is to both receive and transmit signal to a cellular tower with enhanced power and sensitivity. Usually the dB gain isn’t below 7 dB and may be over 10 dB gain. The system’s elements conduit is that the coax . it’s also an element in transmission loss.

    The main aim of the telephone signal booster is taking the prevailing telephone signal around your car, office, workstation or home and amplifying it. After amplification, the signal is rebroadcasted to the world with no reception or weak signal. aside from consisting of an amplifier to spice up the reception, external antenna and internal antenna, there’re telephone boosters with indoor antenna and amplifier as one unit making them superb indoor telephone signal boosters. In most cases the three components are detached. Other optional components include the Attenuator (reduces unwanted frequency signals), Lightning surge suppressor , Splitter and Tap.

    What is a handheld metal detector and it’s used?

    A handheld metal detector is a musical instrument that detects the presence of metal nearby. Metal detectors are useful for locating metal inclusions hidden within objects, or metal objects buried underground. They often contain a handheld unit with a sensor probe which may be swept over the bottom or other objects. If the sensor comes near a bit of metal this is often indicated by a changing tone in earphones, or a needle moving on an indicator. Usually, the device gives some indication of distance; the closer the metal is, the upper the tone within the earphone or the upper the needle goes

    The usage of handheld detectors is various and enormous. In some public occasions, the hand-held detector is often used for peace check like airports, jails, courts, testing centers, banks, hotels, bull sessions, athletic contests, vocal concerts then on. In some factories handheld metal detectors are wont to prevent the thievery who stole some products which contain metals. because the technology develops some student use tiny wireless headsets to cheat while testing, so as to against this behavior the education system requires the guards held a handheld detector outside of the examination room.