1. Installation external antenna.

The first step is installation external antenna. The antenna is installed using fasteners (a swivel bracket or a mast) on the external wall of the building or on the roof, depending on the location.
The specialist determines the direction in which the antenna will be directed, since the incoming signal from different operators communication should be the same, or the signal of any particular operator should prevail if the task was to improve the quality of the cellular signal of only one operator.

2. Preparation and crimping of the cable.

At the ends of the prepared cable, you need to put on N-type connectors and crimp them (or prepare the cable in advance and solder the connector if it does not involve crimping). We recommend protecting the connector with heat shrink or tape, as it can oxidize over time, causing erratic operation and interference. Next, we connect our cable to the external antenna and move on to the next step.

3. Cable laying.

Everyone knows that when laying a cable, it is very important that the distance from the repeater to the external antenna should be minimal, since with a long cable there will be large signal losses (the amplitude of the incoming signal should be maximum). We choose a place for laying the cable, taking into account all the recommendations, lay it and proceed to repeater installation(amplifier cellular communication).

4. Installation of a cellular signal amplifier.

The installation location of the repeater is selected based on the minimum length of the cable and so that it is not located in a visible place. This can be either an attic, if it is a private house, or the repeater is hidden above the ceiling, if it is an office building. But you need to make sure that the installation location complies with the permitted climatic conditions in the repeater’s passport.

5. Connecting an external antenna to the amplifier.

There are two connectors on the cellular repeater body. We will need a connector, which is designated by the letters BS - this is the amplifier input. We connect our cable from the external antenna, making sure that the connector is screwed in tightly and all the way.

6. Installation of the internal antenna.

Depending on the situation and the area of ​​the object, internal antennas maybe several.
If several antennas will be used, then it is necessary to install a signal splitter that will divide the power for each antenna. Next, you need to crimp the cable with connectors, as was done in the beginning, and connect it to the signal splitter and to the internal antennas. Signal splitter connect in a similar way to the second, free output of the amplifier. If only one internal antenna was used, it is connected directly to the repeater.

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1 MegaSystems LLC, Moscow, st. Matrosskaya Tishina, 23, building 1 INN KPP OGRN: Tel. (495), OBJECT: Russia, Moscow region, Leninsky district, Bogdanikha village, Administrative and sports complex, Administrative building. GSM cellular communication amplification system. As-built documentation Moscow 2013 MegaSystems LLC All rights reserved.

2 APPROVED BY THE CUSTOMER 2013 OBJECT: Russia, Moscow region, Leninsky district, Bogdanikha village, Administrative and sports complex, Administrative building. GSM cellular communication amplification system. As-built documentation AGREED 2013 Moscow 2013

3 Primary use Compound executive documentation Sheet Designation Note 1-1 Contents of the as-built documentation. 2-4 Explanatory note. 3-1 Layout of equipment for a GSM cellular communication amplification system in the administrative and sports complex on the ground floor. 3-2 Layout of equipment for a GSM cellular communication amplification system in the administrative and sports complex on the second floor. 4-1 Structural scheme GSM cellular communication amplification systems for the administrative and sports complex. 5-1 Layout of the GSM cellular communication amplification system equipment in the administrative building on the first floor. 5-2 Layout of the GSM cellular communication amplification system equipment in the administrative building on the second floor. 6-1 Block diagram of a GSM cellular communication amplification system for an administrative building. 7-1 Specification of equipment and materials. Applications Basic specifications equipment used in the project. GSM cellular communication booster system Meas. Document sheet Subp. Date Developed Prov. N. counter. Composition of the executive documentation Lit. Sheet Sheets 1 1 Approved.

4 Primary use Application The use of GSM repeaters is advisable in two cases: to receive stable connection in places with poor reception (for example, in rural areas) and to extend cellular coverage to rooms or territories shielded from cellular communications by terrain or building structures. The use of repeaters is the main way to provide cellular communications in underground structures, such as subways and the lower levels of shopping centers. As a rule, repeaters are designed for only one communication band, for example GSM-900, GSM-1800 or WCDMA. An additional feature of the use of repeaters is the reduction in the level of radiation from subscriber telephone sets, which reduces their Negative influence on health, increases the duration of operation without recharging and reduces interference with other radio-electronic systems; the latter circumstance is the main reason for the use of GSM repeaters in passenger aircraft. Operating principle The GSM repeater is a bidirectional amplifier that connects the donor antenna with the service antenna; simultaneously with the amplification, the signal shape is corrected. In this case, the donor antenna receives signals base station, the repeater transmits them in amplified form to the service antenna, the service antenna transmits them to the subscriber’s telephone set; The response signal from the subscriber's device is received by the service antenna, amplified by the repeater and transmitted by the donor antenna to the base station. GSM cellular communication booster system Meas. Document sheet Subp. Developed Prov. Date Lit. Sheet of sheets Explanatory note 2 4 N. counter. Approved

5 General instructions The Administrative and Sports Complex, Administrative building is intended for the installation of a cellular communication amplification system of the GSM-900/1800 standard. The cellular communications amplification system is being constructed at the location of the facility at the address: Russia, Moscow region, Leninsky district, Bogdanikha village, Administrative and sports complex, Administrative building. As-built documentation for the creation of a cellular communications amplification system was developed on the basis of: * design assignments; * initial data issued by the Customer; * research materials conducted by Exclusive Comfort specialists; This album contains technical solutions on the placement and installation of cellular communication amplification system equipment. The album also contains specifications of equipment, products and materials. Installation and connection of cellular communication amplification system equipment must be carried out in compliance with the requirements of: * this executive documentation; * instructions from equipment manufacturers; * regulatory and technical documents valid in Russian Federation. As-built documentation has been developed in accordance with current norms, rules and standards. Fire and explosion safety is ensured by observing the measures and operating rules for electrical installations provided for in the executive documentation. Instructions for installation and installation of equipment An external antenna directed at the base station is installed on the roof or wall of the building in a place that provides the best “radio visibility” of the nearest base station cellular network. Change Document sheet Subp. Date Explanatory note Sheet 2

6 Often at the installation site there is no direct visibility of the base station antennas, so the orientation of the outdoor antenna does not always coincide with the direction to the base station: the repeater operates on a signal reflected from nearby buildings, metal structures and roofs of houses. Preliminary selection of the installation location is carried out using a spectrum analyzer connected to an external antenna. In the case of operation in open areas, the antenna directed towards subscribers is installed on the roof, wall of a building or in another convenient place and is oriented in the direction of the service area. In the case of operation inside a building, subscriber antennas are installed on the walls or ceilings of premises in places that provide the shortest length of RF signal distribution cables and the distance of subscriber telephones from the antennas at a distance of at least 1 m in order to avoid overloading the repeater. The antennas are oriented to best cover the room. The best location for panel antennas is horizontally near the baseboard or ceiling, for ceiling antennas in the center of the ceiling. For normal operation of the repeater, the maximum possible electromagnetic shielding between the antennas must be provided, taking into account attenuation in the supply cables. The shielding level should be at least 20 dB greater than the set repeater gain. The cable length between the repeater output and the antenna should be minimal to obtain the largest coverage radius. In cases where a large cable length is unavoidably obtained, for example, due to the specific layout of the premises or due to requirements for the facade of the building, you should choose a cable brand with lower losses, according to at least, for its largest (main) part. Change Document sheet Subp. Date Explanatory note Sheet 3

7 When installing the repeater, ensure free passage of cooling air between the radiator plates. The repeater must not be installed in a confined space (for example, inside cabinets or in closed niches with a small volume of air), or near heating appliances, because this can lead to overheating and failure. Air conditioning in the equipment room In the equipment room, it is necessary to maintain meteorological conditions within acceptable standards; this requires the installation of an air conditioner operating in automatic mode. Occupational health and safety measures Proceed with equipment installation work only after a detailed study of the as-built documentation, regulatory and guidance documents. It is strictly prohibited: 1. Connect the repeater to the network without connected external and internal antennas. 2. Connect the repeater to the network without surge protection. 3. Install the internal antenna at a distance closer than 2 meters from the repeater. 4. Install the external antenna so that it can be seen by the internal antenna. 5. Extend and solder the cable. 6. Disassemble the repeater and power supply. 7. Use accessories and components for the repeater from third-party manufacturers. (Power supply, antennas, dividers, cable) Meas. Document sheet Subp. Date Explanatory note Sheet 4

10 Stage Sheet Sheets Roofing. 2nd.FLOOR. U U U U U MARKING SYMBOLS Marking of GSM equipment A.0.1 Sequence number Floor number Element type 1st FLOOR. Agreed Inv. vile Subp. and date Reciprocal inv. Change Number of accounts Sheet of document signature Date Exec. Design N.cont. N.cont. Approved. Administrative and sports complex Russia, Moscow region, Leninsky district, Bogdanikha village, Administrative and sports complex Equipment location plan for a GSM cellular communication amplification system. And 4 1 Block diagram "Exclusive comfort" Copied Format A1

13 Stage Sheet Sheets Roofing. 2nd.FLOOR. MARKING SYMBOLS GSM equipment marking A.0.1 Serial number Floor number Element type 1st FLOOR. Agreed Inv. vile Subp. and date Reciprocal inv. Change Number of accounts Sheet of document signature Date Exec. Design N.cont. N.cont. Approved. Administrative and sports complex Russia, Moscow region, Leninsky district, Bogdanikha village, Administrative and sports complex Equipment location plan for a GSM cellular communication amplification system. And 4 1 Block diagram "Exclusive comfort" Copied Format A1

14 Primary use Specification of equipment and materials Equipment for amplification systems for cellular communications of the GSM900/1800 standard. p/n Name Quantity GSM repeater Picocell 900 SXL 1 GSM repeater Picocell 900 SXV 1 GSM repeater Picocell 900 BST 1 GSM repeater Picocell 1800 SXL 1 GSM repeater Picocell 1800 BST 1 GSM repeater Picocell 1800 SXV 1 GSM -repeater Picocell 900/1800 BST 4 External antenna ANT-900-LY 2 External antenna AL Internal antenna AP-800/ID (wall-mounted) 106 8D-FB cable (meter) 2500 Connector N-111/8D 744 DirectionalCoupler splitter (5, 7, 10, 15 dbm) 133 Ancoupler 800/2500 for 2 antennas 6 Combiner 900/lightning arrester 12 AT attenuator Telescopic mast 6 m high with fastenings 3 Meas. Document sheet Subp. Developed Prov. N. counter. Approved Date GSM cellular communication amplification system Specification of equipment and materials Lit. Sheet Sheet Sheets 7 1 2

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Poor cellular reception is a very common problem. Many people encounter it both at their summer cottages or in country houses, and in their own apartment within the city or village. Weak signal telephone number or its complete absence is primarily related to the remoteness of the base station of your mobile operator, building density or terrain.

If you are faced with this problem and high-quality reception is a vital necessity for you, you need to install a cellular communication amplifier. More precisely, you need a cellular communication amplification system in which such an amplifier is one of the devices. In general, the described system consists of the following “links”: a GSM repeater, an external antenna for receiving a cellular signal, power dividers, a connecting cable and the connectors necessary for connection.

Of course, choose similar system and, what’s more, installing it and properly configuring it can only be done by a specialist. However, so that you can get on the “right path”, we will try to understand a little about modern cellular signal boosters and which ones are better to choose.

Selecting a mobile signal booster

Before deciding and choosing the right GSM communication amplifier, you should understand the main technical characteristics of these systems:

• Cellular standardGSM mainly divided into two main bands: GSM 900 and GSM 1800 MHz. Base stations (cell towers) in the 900 MHz range have a greater range, but fewer channels (the ability to talk to several subscribers simultaneously) than at 1800 MHz. Therefore, 900 MHz base stations are more often used in the region, and 1800 MHz base stations are used within the city. Therefore, for a summer residence or country house It’s better to stick to the GSM 900 standard.
• Gain factor (GC) of the GSM signal amplifier is another important parameter for choosing a system, because it directly affects the level of network reception provided. Simply put, if your mobile phone has poor reception indoors, but outdoor reception is almost poor maximum level, then an amplifier with a gain of 70-75 dB is quite suitable for you. If your cellular reception is uncertain even in the area near your house, then you should take a closer look at a cellular amplification system with a coefficient of 75-90 dB. It is better not to purchase a cellular repeater with a gain of less than 65 dB at all, because... he is unlikely to cope with the task you set.
• Repeater output power mobile communication amplification systems. This parameter affects how much area of ​​the room your GSM signal amplification system can “cover” with reliable reception. For example, a cellular network amplifier with a power of 100 mW is capable of providing reliable reception to an area of ​​up to 200 sq.m, and a cellular repeater with a power of 320 mW can cope with a room of up to 800 sq.m. However, there is no direct relationship between the power of the repeater and the area of ​​your premises, but only the concept of correlation. A variety of factors can influence how GSM repeaters provide reliable reception to a specific area of ​​a room. For example, the level of the input signal from the cell tower, the length of the cable from the external antenna to the amplifier, the control unit, as well as the proper installation of all equipment as a whole.

At the moment, among repeaters for a country house, office, cottage or cottage, the most popular models are Picocell 900 SXL and Picocell 900 SXM.

• Picocell 900 SXL operates in the GSM 900 band. The gain of this system is 80 dB, and output power repeater - 320 mW. The 900 SXL amplification system is intended for indoor installation only.
• Picocell 900 SXM has the same parameters as its younger brother Picocell 900SXL, however, this system is equipped with a cold and moisture resistant housing with an IP66 protection rating. This device is optimal in cases where it is not possible to lay a cable indoors and cellular GSM amplifier with its entire structure must be installed outdoors.

Choosing a quality external antenna

An external antenna is required to receive a signal from your cellular operator's base station. It is mounted on an ethereal mast installed on the roof of the building. It should be borne in mind that an external cellular antenna is constantly exposed to a variety of external factors (rain, snow, wind, etc.), so when choosing its model, you should pay special attention to reliability and durability. A fairly good option is the model AL-900-11, because it is made of a solid sheet of metal coated with enamel paint, which will reliably protect it from oxidation, corrosion and destruction.

Selecting Suitable Internal Antennas

The choice of these devices is directly related to what stage of construction your house or cottage is at. If the interior decoration of the room has not yet been carried out and you still have the opportunity to install an internal cellular antenna behind suspended ceilings, then it is worth purchasing a network of antennas with a fairly low gain. Thanks to this solution, you will have a uniform cellular signal coverage area. The preferred quantity is the ratio of one antenna for every 100 sq.m. area. Among these antenna models, I would like to recommend AP-800/2500-7/9ID. These antennas support all modern this moment communication standards: GSM900, DCS1800 and even UMTS 2100 (3G).

If you need to provide a high-quality mobile signal inside a living space, and, at the same time, not disturb its interior, you should take a closer look at one antenna with a high gain. Such antennas, if possible, are installed in invisible places. Interesting models RAO-11GL-60 or RAO-14GL-70, which have a gain of 11 and 14 dB. This fairly high gain makes it possible to achieve the network coverage you need using one antenna.

Selecting cables and connectors for the system

All devices of the GSM network amplification system are connected to each other by a coaxial radio frequency cable with a characteristic impedance of 50 Ohms. For a cottage or dacha, the best cable brands in terms of price and quality are 5D-FB or 8D-FB. The difference between them is the thickness of the central core and, therefore, the level of residual attenuation during the passage of the signal (5V-FB = 0.2 dB/m; 8V-FB = 0.13 dB/m at a frequency of 900 MHz). Taking into account the fact that modern cellular communication standards are increasingly using frequency range in gigahertz, it’s worth choosing an 8D-FB cable, because it is more promising.

The 5D-FB cable uses N-111/5D connectors, and the 8D-FB cable uses N-111/8D connectors.

Selecting Cellular Network Power Dividers

The power divider is designed to branch cables into a certain number of internal antennas. The most reliable and widespread models are Picocoupler And DirectionalCoupler. Picocoupler brand devices are designed to distribute the cellular signal evenly throughout the room with a different number of outputs for connecting antennas. DirectionalCoupler models are used to distribute the network signal unevenly.

As a result, if you have correctly selected all the devices, bought a cellular signal amplifier, installed and configured it, the general diagram and principle of operation of your system will look like this:

Keep in mind that when choosing a cellular signal booster system for an office, cottage or country house, you must take into account the technical characteristics of all its individual devices. At the same time, it is extremely important to select a high-quality GSM network repeater, ensure its correct operation (compatibility) with other devices and meet all the necessary requirements for ensuring high-quality and uninterrupted communication of the GSM and UMTS (3G) networks.

Compliance with required standards

When installing a GSM or 3G mobile communication amplifier, you should be aware that its poor-quality installation or configuration can have the opposite effect, and your system, as a result, instead of increasing signal reception from the BS, will, on the contrary, reduce it.

Moreover, any of the cellular operators - MTS, Beeline, MegaFon and others - have all the technical capabilities to detect the presence of interference for high-quality reception and distribution of radio waves from their base stations. Using special measuring equipment, engineers will determine the location of interference in the form of an incorrectly installed GSM amplifier.

After this, the owner of such a system will be warned about the need to reinstall, correct settings, or completely replace all equipment. If this warning is ignored, mobile operator has the right to file a complaint Radionadzor, which has all the powers to bring the unscrupulous owner of a GSM cellular network amplifier to administrative liability.

Keep in mind that any cellular signal booster, even if installed in the most competent manner, creates interference that interferes with the base station signal. However, there are certain standards, and if you do not exceed their maximum value, you should not have problems. However, for this it is important not only to skillfully install all the elements of equipment, but also to be able to configure it correctly.

Therefore, if you do not have the necessary knowledge on setting up GSM repeaters and installing them, it is better not to try to make a GSM signal amplifier with your own hands, but to use the services of specialists, of whom we now have more than enough.

Confident reception!

Amplification means are designed for the rapid transmission of voice information, warning large crowds of people and giving signals.

Sources of speech information can be directly employees, or technical means, such as tape recorders or radios.

Designed to convey information both to employees of internal affairs bodies and to transmit information to citizens, individual offenders, etc.

The block diagram of speech amplification means is shown in Fig. 6.1.

Rice. 6.1. Block diagram of speech amplification means
SU – signaling device; M – tape recorder; Pr – receiver

Any means of sound amplification consists of a microphone, an amplifier powered by a power source and a loudspeaker. The amplifier may contain a linear input to which external sources of speech information are connected, for example, devices for recording or storing speech information (tape recorders, MP3 players, voice recorders, CD players, etc.) or radio receivers.

The microphone converts acoustic vibrations into electrical vibrations proportional to them, i.e. is an acoustoelectric transducer. However, the resulting electrical oscillations are very low-power, small in level and amount to approximately 1-100 mV. In order to reproduce sound with the required power level, it is necessary to increase the power of weak electrical vibrations and increase the level to 10 V.

This task is performed by a power amplifier, which is an electronic (semiconductor) circuit. Amplifiers use the ability of active elements (transistors, microcircuits) to change some of their parameters and ultimately amplify signals.

The amplifier is electronic device, which increases the power of electrical signals due to energy consumption direct current. power supply. The battery can act as a power source ( accumulator battery) or a secondary power source that converts the supply voltage (AC voltage 220 V) into a constant voltage of the required rating.

Amplifier characteristics:

range of amplified frequencies;

gain;

supply voltage;

power.

The classification of speech amplification means is shown in Fig. 6.2.

Rice. 6.2. Classification of speech amplification devices

Stationary amplification devices are installed in halls, rooms, open spaces and cannot be moved. They are used to support daily activities, to inform relevant units and individual employees of internal affairs bodies, during formations, meetings, meetings. Structurally, they consist of permanently installed speakers, microphones, and an amplifier spaced apart in space. There are certain features when organizing the sound of open spaces and rooms.

Sounding rooms is one of the most difficult tasks in practical terms. Voice quality is determined by the volume and intelligibility of speech. The volume depends on the degree to which the level of the useful sound signal exceeds the level of the active one. background noise, speech intelligibility depends on many factors, including the quality of the sound-reproducing equipment, the acoustic properties of the room, the location of the sound-reproducing devices, and much more.

Loudness and intelligibility are related due to the following circumstances: the sound field in a room consists of two components - the sound emitted by the sound-reproducing equipment (direct sound) and reflected from the enclosing surfaces (diffuse sound). The ratio of diffuse sound to direct sound is called the acoustic ratio of the room. For normal intelligibility, the acoustic ratio must have some optimal value: at a low acoustic ratio, when the magnitude of direct sound exceeds the level of diffuse sound, speech becomes abrupt; at a high ratio, speech or music becomes unintelligible, turning into cacaphony. Thus, each room has its own optimal power and layout of sound-reproducing devices.

The specificity of sound installation in open spaces is that large areas have to be sounded, and the distances between sound sources are significant: if the speakers are placed incorrectly, an echo can occur (both in open spaces and in large rooms). Secondly, the propagation of sound waves in open spaces depends on climatic factors and the state of the atmosphere (dust, presence of fog, etc.). Thirdly, in open spaces there is always acoustic interference

Also, when designing sound systems for open spaces, it is important to take into account the sound pressure level created by loudspeakers at the border of the sound zone and beyond. If there are residential premises, hospitals, etc. nearby, then people staying there may be disturbed sound transmission, designed for the main zone. Therefore, the level of the sound field outside the sound zone should not exceed the specified sanitary standards, provided that the sound system is supplied with rated power.

An example of a stationary amplification system is shown in Fig. 6.3.

The “GROM” public address system is designed to equip rooms and open areas where a public address system is required. The system provides speech broadcasting, the ability to submit sound signals in emergency cases (“Alarm”), feedback. Power is supplied from a 220V network.

The difference between portable speech amplification devices and stationary ones is that the elements of the system, which may coincide with stationary ones, however, they are not permanently installed, but can be transferred or transported and deployed in a new location.

Rice. 6.3. Public address system "Grom"

Portable speech amplification devices are installed on a vehicle base using special fasteners. As a rule, such systems are powered from the vehicle’s on-board network. Structurally, the loudspeaker amplifier and microphone are spaced apart. The loudspeaker is installed on the roof of the car using special mounts. The amplifier is located in the cabin and has an external microphone combined in the same housing with the control unit. Representatives of this group are various signal and loud-speaking devices (SDU).

All special vehicles of internal affairs bodies must be equipped with SGS. Distinctive feature The SGS is the presence of light signal beacons, which make it possible to send light signals in addition to sound (“siren”). Sound signals are issued from a moving vehicle when providing priority passage, chasing another vehicle, escorting convoys of vehicles, etc.

In addition to special sound signals, the SGU allows you to broadcast information through a microphone, for example, various commands and instructions to drivers of moving vehicles and pedestrians. Machines equipped with SGU can also be used when carrying out measures to ensure public order in crowded places, since their output power is an order of magnitude higher than that of electric megaphones. Using car radios (by connecting them to the SGU) and forming a radio channel, it is possible, for example, from a headquarters vehicle to simultaneously broadcast the necessary information to several points within a stable radio connection. You can also act during operations to capture armed criminals located in some shelter, to negotiate with them or divert their attention.

SGU "Ermak" is shown in Fig. 6.4.

Rice. 6.4. SSU "Ermak"
a) light-acoustic unit; b) LEDs; c) BARS power unit and 4-button microphone with control function

To supply light signals to the Ermak SGU, an LED installation is used: 2 blocks of 16 LEDs each. A distinctive feature of the use of LEDs is low power consumption and high brightness of the flash, which is clearly visible from different viewing angles due to the special arrangement of the LEDs. The amplification system provides a sound pressure of 120 dB. The sound and light operating modes of the ERMAK SGU are controlled entirely from a four-button microphone. Light indication allows you to inform the patrol car crew about the selected mode. The loudspeaker is structurally located in the light-acoustic block. This placement, compared to a similar under-hood loudspeaker device, provides more opportunities when working with a microphone and increases the perception of the required information by road users.

Wearable devices are powered by batteries or rechargeable batteries, have small dimensions, and the amplifier is usually combined with a loudspeaker horn. The microphone is either remote, connected to the amplifier with a short conductor, or located in the same housing with the amplifier. Representatives of this group are electric megaphones.

The electromegaphone consists of a microphone that is insensitive to acoustic interference, an amplifier of low-frequency electrical vibrations, and a horn loudspeaker with a handle that allows you to hold it in your hand.

Powerful electric megaphones are equipped with a carrying strap. The microphone (usually located at the end of the electric megaphone) is positioned so that on the side of the loudspeaker (in the direction of sound emission) it has the least sensitivity, in order to exclude the occurrence of positive feedback, leading to self-excitation of the amplifier and the publication of a piercing characteristic squeak. Using an extension cable, the microphone can be carried some distance away from the loudspeaker (for example, when the loudspeaker is carried on a shoulder strap or mounted on the roof of a car). As a rule, electric megaphones have the ability to record both from batteries and from external source power supply, for example, a car's on-board network. Some provide the ability to provide sound signals, such as a whistle or siren.

Electromegaphone EM-15 is shown in Fig. 6.5.

Rice. 6.5. Electromegaphone EM-15

Electromegaphone EM-15 is designed for feeding voice messages and the “Siren” signal in open spaces and large indoor spaces. It is used in open space (stadium, square, etc.) at a distance of up to 1000 m in the direction of the wind and with a side wind of up to 5 m/sec and in large indoor spaces. It is a functional analogue of the electromegaphone EM-12. It is characterized by high speech intelligibility and low power consumption. The duration of continuous operation is at least 10 hours. On the body of the electric megaphone there is a button to turn on the “Siren”, as well as sockets intended for connecting a microphone and an external power source to the electric megaphone. For ease of use, the microphone is made remote, which allows you to use it at a distance of up to 1.5 m from the megaphone, or rigidly mount it on the lid.

The following means of sound amplification are used by employees of internal affairs bodies:

When ensuring public order during mass events;

When supervising traffic, ensuring priority passage for special vehicles, promoting traffic rules;

In the event of mass unrest;

When detaining armed criminals, fighting terrorism.

Requirements for voice messages transmitted using speech amplification devices:

Strict adherence to the rules of articulation, ensuring a clear, leisurely pronunciation of each word, in a voice of average volume;

If it is necessary to repeat the same text multiple times, it is advisable to record it and then play it back using sound recording equipment;

Inadmissibility of arbitrary editing of spoken texts. For specific typical situations, standard texts should be prepared.

When contacting a driver who violates traffic rules, you should clearly state the type and license plate number of the vehicle he is driving, his subsequent actions, etc.

It is necessary to carefully prepare texts that could be used to apprehend criminals, especially armed ones. Some of the texts should be intended to ensure the safety of citizens who accidentally find themselves in a dangerous zone, the other part should be intended to suppress the actions of criminals. When apprehending an armed criminal, it is sometimes necessary to invite relatives or friends to address him. In such cases, it is advisable to help them compile the text of the appeal, focusing on the prepared options. Even more options should be prepared to protect public order during mass events.

When using speech amplification devices, it is necessary to take into account weather conditions (wind, rain, snowfall, fog), which affect the quality and range of sound propagation. To ensure the best performance of a sound amplification device on a ground vehicle, the horn loudspeaker must be mounted on a turntable, since the vehicle itself cannot always be oriented so that the longitudinal axis of the loudspeaker coincides with the desired direction of sound propagation. It should also be remembered that the higher the speaker is installed, the farther and more clearly the broadcast information will be heard.

The cellular communication amplification system is designed to ensure reliable reception of GSM signals for subscribers of the MTS, BeeLine, Megafon networks in the Customer's country house.

The reasons for unstable cellular communication at the site are:

1. The presence of dense forest around the village.
2. Thick external brick walls of the house.
3. Distance from cellular base stations.

To ensure reliable cellular reception in the house, before carrying out construction (repair) work, it is necessary to survey the site to determine the level of cellular signal in various parts of the house.

It is very important that this inspection, and the subsequent design and installation of the system, be carried out by specialists, since for this they have the necessary equipment, skills and experience, as well. also, knowing how much this level will drop in the house after finishing finishing work in the house.

Even if the signal in the house on the 1st and higher floors is more or less tolerable, then on the ground floor, as a rule, it is completely absent and measures are necessary to broadcast the cellular signal to this floor.

It must be taken into account that finishing work significantly dampens the signal and it is necessary to foresee this point in advance during the design of the system.

Typically, the system consists of:

An external antenna (external antennas) deployed outside the building in the area of ​​at least some signal reception from a cellular base station.
- Signal repeater(s), which receives the signal from an external antenna, amplifies it and sends it to internal antennas installed in the house.
- Internal antennas that communicate with users' cell phones and provide traffic from the cellular base station.

Attention:
1. Repeaters and indoor antennas are installed secretly in the house; the places where they are installed must be maintained. Also, they are connected with high quality cables. Therefore, the system must be carefully designed before finishing work on the house begins.
2. There is a misconception that cellular amplification systems are harmful to health, due to the supposed emission of radio signals that are amplified by this system.

In fact, this is not true, quite the opposite.

The fact is that when the level of the cellular signal corresponds to an acceptable level, it has the same effect on a person as on a city street, in a city apartment, office building, etc., namely, it does not cause any harm .

If, however, the level of cellular communication is low or absent altogether, then your cell phones begin to intensively emit a signal to search for a base station (notice how quickly the cellular telephone when there is no cellular signal?). Thus, it is the absence of a signal in any area that causes increased radiation of the radio signal by the phone. But this doesn’t mean anything, because... The negative impact of cellular radio signals on humans has not yet been proven.