Installation, connection and settings of the GSM repeater are carried out according to the "native" instructions attached to the product. This article provides general principles and recommendations for all products of this type, which will help you save on the installation of a repeater.
See examples of cellular signal booster settings.
Please note that you must not turn on the repeater before it complete installation, remember that the outdoor and indoor antennas must be separated by a radio shielding obstacle. Failure to follow the installation procedure may result in damage to the equipment.
1. The first and most important step is to set the communication standard in which your phone works in the place of the planned installation of a cellular signal amplifier. To do this, you can make a call (from your phone, from the place where you are going to install the repeater), and record the time of the call. Next, you need to write a letter to the service department of your operator, indicating your phone number, the number of the called subscriber and the time of the call, with a request to set the GSM communication standard.
The method is simple, but has several disadvantages. Not all mobile operators respond to such requests. Requesting and receiving a response will take a long time. Well, and most importantly - in the same place, the same operator can operate several base stations, with equipment of different standards. You also need to choose the most preferred one.
The most common standard is GSM-900. It has undeniable advantages - the coverage area can reach 30-40 km from the operator's base station, which means that in areas remote from the city limits, the 900 standard is used more often than others.
DCS-1800 has a large capacity, which means that the number of subscribers served by one base station is higher than that of GSM-900. However, the coverage area is up to 15-20 km from the operator's antenna.
The 3G standard is easily calculated by the appearance of the corresponding icon on the phone screen; this standard not only works for telephone communication, but also provides high-quality Internet access (in theory, the speed can be up to 14 Mbps).
Now let's talk about how to distinguish the GSM-900 standard from the DCS-1800. To do this, you need to use a phone or a special application for mobile devices, allowing you to scan a cellular network signal for a communication standard. In this review, we will scan the communication standard using the iPhone.
Conditions: it is required to determine what kind of repeater is needed at the dacha in the Leningrad region. The 3G icon appears in places, but the Internet is not needed, and the phones are planned to be used without 3G, so data transfer and the 3G standard itself are disabled in the phone menu (Settings-Basic-Cellular data). Next, turn on the service menu built into the iPhone. To do this, in the dialing mode, enter *3001#12345#*
and click Call.
Service menu opens field test.
In the window that opens, we get data about the cell in which the phone is located. In the upper left corner is the signal strength. Where -62 dB is a strong signal, and -105 is very weak. That is, the smaller the numerical value (the minus was discarded), the stronger the signal.
ARFCN (Absolute Radio Frequency Channel Number) - this is the conditional number of the frequency radio channel in the UMTS system, which determines the value of the carrier frequency of the radio channel).
Numbers from 1 to 124 are GSM-900 frequencies. Numbers from 975 to 1023 are adjacent frequencies used by add-ons over GSM-900 (in MHz this range is from 925 to 935), it is important to know that not all repeaters capture these frequencies.
Finally, numbers from 512 to 885 are GSM-1800 frequencies.
2. Installation of an external antenna of the GSM repeater. As a rule, the antenna is mounted on a bracket on the roof, the facade of the house. It is possible to use a mast or existing buildings. The direction of the antenna is towards the intended signal source (with the possibility of adjusting the direction during testing).
Note. Ideally, the internal and external antennas of the repeater should be separated by an obstacle that does not allow the communication signal to pass through (reinforced concrete wall, floors, etc.), it is also important to separate the horizontal planes of the antennas (outer on the roof, inner - inside the house, in its lower part ). Otherwise, an unwanted “echo or self-excitation effect” is possible, when the repeater will amplify its own signal (similar effect when bringing a microphone to a speaker).
3. Installation of the internal antenna. Install in the part of your building where you will most often use your mobile phone, and the cell signal repeater itself, as close as possible to this area. Remember that the GSM repeater provides the strongest reception on the same floor where the GSM repeater is installed. Attenuation of 50 dB (and this is almost complete attenuation in the 900 MHz band occurs at a distance of 10 meters from the internal antenna, i.e. when using a circular antenna or an omnidirectional antenna, maximum coverage and a confident signal, you get a coverage area in the form of a circle with a radius 10 meters and an area of about 300 square meters (neglecting building features and radio interference).
5. Finally, connect the power supply of the amplifier to the corresponding socket on the rear panel of the unit, and then to the source of electric current.
6. The repeater is installed. It remains for us to check the signal level in the room, try to change the direction of the external antenna (step 15-30 degrees), the location of the internal antenna. The data update rate is 15-30 seconds, so by turning the antennas, wait for all the data to be updated.
Useful information:
1. The external antenna automatically selects a stronger signal, while the repeater adjusts its work in such a way that weaker signals are processed, but remain not in priority, the repeater does not work at full power. You may have to change the position and direction of the external antenna several times, in search of the operator and standard you need. If this does not help, try testing the operation of the repeater with a SIM card or a phone from another operator.
2. Due to the fact that both antennas (external and internal) are transceivers, it is very important to separate them at the recommended distance during installation, to separate them with a shielding obstacle (reinforced concrete floors and walls, metal cover, etc.; wood and glass are not a serious obstacle to the propagation of the radio signal). If the self-excitation effect occurs, a larger antenna spacing is required, the removal of the external antenna to the mast, a change in the position of the internal antenna.
3. Modern cell phones work in such a way that when a signal from 3G networks (2100 MHz) of your operator appears, the phone automatically switches to them, leaving the signal amplification zone provided by the repeater. In this case, the quality of the communication signal can be significantly worse. To avoid such unwanted switching, turn off 3G networks on your phone when you don't need them.
4. The speed of the Internet in the 900 MHz frequency range is determined by the technical capabilities of the operator, check this information with your operator.
Driving safety is always a priority for every driver. He is responsible not only for himself, but also for the passengers. Especially for this, and developed "turn signals". able to indicate the direction in which the vehicle is turning in order to optimize the movement of vehicles. One of the innovations of the "Chinese craftsmen" is the turn signal to the mirror. We will talk about its installation today.
The repeater on the mirror duplicates the signal indicating the direction of movement
Device basis
The installation of such equipment is an original and worthy decoration for a car. Due to its versatility, the repeater can be attached to any vehicle. The turning device is a small device that looks like a plate. This textilelite base is quite durable and equipped with LEDs. There are some model options: mounting in a reflective surface or installing a flexible "signal" on the corners of the mirror. They are inexpensive, but you can make them yourself.
Principle of operation
A repeater is attached, which is responsible for the rear view. They pair with the original turn signals to produce similar information. When the driver turns on the turn notification, the factory and installed device will show the same data. Signal duplication will also give originality appearance car.
There are ready-made models on the market that require only manual installation. But you can make turn signals into mirrors yourself - this is a fairly easy process that will require:
- LEDs or ready-made "turns";
- scotch;
- 2 elements causing a resistance of 180 ohms and 0.5 W;
- wire 20 cm long;
- marker for marking;
- soldering iron.
Mounting process: unpinning
If you are interested in turn signals in mirrors, first you need to dismantle the reflection elements. To detach the reflective surface from the mirror, the fasteners are carefully snapped off. After that, you need to disassemble this element and the plastic base. Usually the mirror is inserted into a special frame, fastened with glue or tape. To do this, warm the surface with a technical hair dryer for five minutes, then the elements must be freely removed.
Marking and power supply
When assembling the device yourself, it is important to correctly indicate the mounting locations of the LEDs. Installing repeaters in mirrors is done using a marker, which draws a figure of nine circles on the back of the reflective surface. This number of bulbs is enough to ensure comfortable visibility. After that, the form is glued on the mirror with adhesive tape, and the LEDs are installed. It is important that they are matched in polarity. They need to be fixed with a luminous side.
The next step is to solder the wires. To begin with, they are stripped, and divided into five veins. Then they need to be twisted together. A resistance of 180 m is alternately soldered into the negative wire. Now it is checked whether the power is on.
Mirror cleaning
In order for the arrow to be visible through the reflective surface, it must be cleaned of excess material. When the whole structure is checked for performance, and the markings match the location of the light bulbs, you need to make small holes in the amalgam. The LEDs must be clearly visible through a reflective surface. Next, you need to clean the holes with a hacksaw for metal to remove sharp edges. It is important to remember that not all mirrors are made of glass. If the model is made of plastic, it will be enough to lower the resistance by 140 ohms. In this case, the brightness of the bulbs will be able to pass through the plastic.
Collecting back
Many people notice that the installation of turn signals in the mirrors creates a loose fastening of the LEDs. To do this, you need to warm the back panel with a hairdryer in the places where the light bulbs are located. But in no case should you heat the fasteners! After sufficient warming up, press the structure against the glass - it will bend a little and connect firmly. After a couple of minutes, you can proceed to the last step.
Wiring
In this process, it is enough to transfer the “minus” to the body, and the “plus” must be removed from the door and connected to the on-board network. After that, the device will be that of the rear turn signals.
Such manipulations are available to every motorist. Having spent a small amount of time, you can get high-quality mirrors with repeaters. This method is completely safe and requires only attention to the stages of work. Thus, you can independently increase safety on the road, because it is not always possible to notice rear turns. In the case of mirrors, they will always be clearly visible to drivers from behind.
From personal experience, I would like to say that the repeater is a useful trick. It is unusual for our places, so it is always noticeable, which means it works.
Probably, everyone is familiar with the situation when in the far corner of the apartment it is not possible to connect to the home network - the signal is so weak. Or when several people are sitting on the home network, because of which the download speed drops significantly. A WiFi signal repeater is a great way to deal with these little annoyances. What it is and how it works, you will learn from this article.
What is a repeater?
A Wi-Fi repeater, also known as an amplifier, repeater or repeater, is a device that helps to significantly increase the coverage area of \u200b\u200bthe network signal. It receives a signal from the router and provides its further transmission. You just need to allocate an extra outlet for it and figure out the network settings. Please note that you need to install a Wi-Fi repeater in a place where the main signal is still strong enough. At the very least, do the initial installation and configuration in an active coverage area, and then you can move from outlet to outlet to try all the relay options and find the best one for your premises.
The principle of operation of the repeater
What is a Wi-Fi repeater for? The fact is that if you decide to go ahead and simply increase the signal strength of the router so that it "catches everywhere", then this will not lead to anything good. The consumption of electricity will increase, the device will overheat, and as a result, everything will end in a breakdown.
Another sensible note: as we noted above, the repeater is often called an amplifier, but this is not entirely true. The WiFi repeater does not amplify the existing signal. It just spreads it over a large area. Buying a repeater will not amplify anything and will not make your Internet super-fast, but rather, on the contrary, will slightly reduce the speed due to the creation of another signal distribution point. But this should not alarm you - we will look at the impact of the repeater on the speed below and explain in which cases it will be insignificant.
Do you need a repeater?
Before you go to buy a repeater, think: maybe there is another solution to the problem. This is not even about the increase in signal strength mentioned above, but it is trite about where the router is located in the apartment. The closer your device is to the geometric center of space, the more uniform the signal will be broadcast in all directions. Also check which way the router's antenna is pointing. For horizontal signal distribution, it must be directed upwards.
What does a WiFi repeater look like?
There are different models of amplifiers. Some are similar in size and shape to Charger for mobile phone, only without wire. For example, the model in the picture below looks like a compact curved plate with a wall plug, LED indicators, an Ethernet cable port, and a reset button.
There are models that in their form are not much different from the router.
Usually, the package also includes instructions, an Ethernet cable, and a driver disk.
Easy as pie: WPS button
Most modern devices have a magic WPS button (or QSS on some models) that is ideally designed to make life much easier, but in real life, on the contrary, sometimes interferes with network use.
If both the router and the repeater have this button, then all you need to do is first press it on one device and then on the other. A few minutes of waiting until the Wi-Fi repeater and router find each other, and voila - you can work. But there are recommendations where it is advised to configure the repeater manually by selecting a specific WiFi network in order, firstly, to reduce the number of failures in relaying, and secondly, to protect yourself. WPS technology is easily hackable. Therefore, it is often advised to disable this mode altogether if you do not have to connect new devices often.
Also note that sometimes the WPS button is combined with the Reset function. It all depends on the duration of pressing: if you hold your finger on the button longer, then instead of turning on WPS, restart the repeater, and all the settings you have set will be reset.
How to set up a WiFi repeater manually
For a more stable signal, it is better not to rely on WPS, but to register the entire configuration manually. Connecting a Wi-Fi repeater is actually even easier than setting up a router. First of all, plug the Wi-Fi repeater into an outlet and connect to it through a computer using a cable or Wi-Fi. Then open a browser and enter the IP address in the address bar, you will find it on the back of the repeater. The screen will refresh and the login form will appear. There you enter your login and password: if you have not changed anything in the router settings, then by default it is admin / admin. The settings page will open.
Here you can somehow name your Wi-Fi repeater or leave it with the factory name. The final stage - enter the password from your Wi-Fi in the required field.
What's going on with internet speed?
Sometimes there are doubts about the advisability of buying a repeater. The main argument is that the signal propagation range increases, but falls overall speed the Internet. The practice of using repeaters shows that speed fluctuations occur: any additional link in the chain of "distribution" of the Internet will reduce the flow. However, the decrease is usually not so significant as to greatly affect the signal strength, and is largely determined by the technical characteristics of the devices in the chain. In other words, the Internet will not “fail” and “slow down” if your devices initially catch the signal tenaciously.
Router as an alternative to a repeater
There is a popular belief that if you have an unnecessary but working router at home, then it is not at all necessary to purchase a WiFi signal repeater. Many models are designed in such a way that they can perform the functions of a repeater, the main thing is to set them up correctly. This is a longer process than setting up a regular repeater, but it is quite doable on your own. Note that it is easiest to establish a connection between two devices from the same manufacturer - there are more chances that the routers will notice each other and work smoothly. The customization process itself also depends on the brand.
First, the router that you are going to use as a Wi-Fi repeater will need to be connected to the computer using a wire. Then you will need to check the adapter settings (through the "Network and Sharing Center", which can be accessed from the "Control Panel"). The device must have an IP address of 192.168.1.21 with a subnet mask of 255.255.255.0.
Then, just like when setting up the repeater, you will need to type in the IP address from the bottom of the device into the address bar. Again use the standard login and password - admin/admin. On the page that opens, you will need to find the "Wireless Mode" tab and go to the settings. We are interested in the "Enable WDS" option - in this way we will create a network that will combine two routers. You will also need to change the IP address of the router that will act as a repeater so that you can enter the setup mode. You can simply change the last digit or add a zero after it.
After that, you need to open the list of available networks, find the one you need, select it and enter the password. By the way, do not forget to secure the network on the second router so that you can also connect to it using a password. To do this, we go to "Security Settings" and in the "PSK Encryption Key" column, enter our password and save.
Now the router works as a WiFi repeater. You can detach from the computer and install in the desired location.
Checking connection status
After you have configured the repeater or router in repeater mode, you need to check how the Wi-Fi repeater works and how well it picks up the signal. It is advisable to check on all your devices - laptops, tablets, phones - whether they see the network that the repeater distributes, or continue to connect to the main router (for this, you can write different names in the settings). Also check if you have installed a Wi-Fi signal repeater for the router in a suitable place, if you have achieved your goal of improving the quality of communication.
To do this, you can not just walk around the apartment with a smartphone and count the number of sticks in the connection, as everyone usually does. Download one of the special applications on your device that can check the signal strength.
Please note that if you need to expand network coverage over a fairly large area, and even in different directions (for example, to the floor below and to the next room), then most likely you will have to buy two repeaters.
Good day! I want to tell you about installing a set of repeaters in mirrors on Lada Priora 2. After buying the Priors were ordinary black mirrors, not conspicuous, without repeaters. I wanted to convert it to SE, but I didn’t want to change the mirrors themselves, since these already have heating and electric adjustment, and the price of new mirrors was biting. Remembering the online store site, where I constantly order spare parts, I immediately started looking and found what I needed, namely a conversion kit at a fairly reasonable price. After reading the reviews, I decided what to take. I ordered immediately in color and with plugs on the fender, the wiring is also included.
Delivery was a transport company, the quality of the pads themselves is excellent, the packaging too, it came in the best possible way as a gift there was a sticker. Picked up and away we go!
Installing a set of repeaters in the Lada Priora 2 mirrors:
- remove the standard lining on the mirrors by prying them with a screwdriver or something else sharp;
- like it or not, you have to remove the door trim and mirror caps;
- first we set the repeaters themselves with diodes so that the white cable from the repeater looks up the mirror, and then the overlay, attaching to the mirror, simply snaps it with the force of the hand;
- we lay the wiring in standard places next to the heating wires, everything goes well;
- remember the plus and minus so as not to confuse: the plus is brown, the mass is naturally black (do not confuse), then we extend the wiring through the corrugation in the door into the salon under our feet. On both sides, the wires are long enough.
- it’s not so easy to drag the wires through the rubber band between the door and the body, but if you try everything will work out;
- You still need to remove the inner plastic threshold. I repeat: since the kit includes repeater plugs for the fender, I removed the standard repeaters, but here, if you wish, you can leave them and just crash into the wiring, I decided not to leave them (otherwise a lot of things blink - like a Christmas tree), and installed stubs in their place;
- excellent adhesive tape grabs quickly and holds tightly, although it worked on the street;
- pre-heated the installation site itself with a building hair dryer so that the metal on the wing was warm: after all, it is winter outside, but in summer there will be no problems;
- do not forget to degrease the surface;
- I powered the wiring to the repeaters from the standard one that went to the wing, simply pulling it back into the cabin and putting the twists in heat shrink (or on electrical tape - as you like);
- we collect, check and enjoy mirrors with repeaters.
17.03.2012
This material will address the issue of practical knowledge for the selection and installation of cellular signal amplifiers (GSM repeaters).
Measurement of the GSM signal level and determination of the frequencies of base stations of cellular operators
To measure the signal strength, we need a simple phone, namely the Netmonitor function, which is absolutely in every phone. In our opinion, Samsung phones are best suited for these purposes. In particular Samsung C170, X820, S5570 Galaxy Mini and another dozen and a half phones. We dial the code * # 9999 * 0 # and a black screen appears with various technical information. Next, by pressing the up and down arrows, you need to get to the page shown below.
Now let's see what these values are. The column on the left is the numbers of the radio channels by which we can determine the frequency and, accordingly, the GSM range. In this case, the phone shows only the frequencies of the cellular operator whose SIM card is inserted into the phone (in this case, Megafon of the Moscow region).
In general it looks like this:
Channels 1-124 are GSM 900
Channels 512-886 are GSM 1800 (total 374 channels, which is 3 times more than GSM 900)
Channels 974-1024 are E-GSM (an extra 10 MHz to the left of GSM 900). There are no repeaters for this band, but most Picocell models capture channels 1016-1024 with slightly lower gain (more on this later).
DownLink - communication channel from the base station to subscribers
UpLink - communication channel from subscribers to the base station
GSM 900 - UpLink 890-915 MHz, DownLink 935-960 MHz
E-GSM - UpLink 880-890 MHz, DownLink 925-935 MHz
GSM 1800 - UpLink 1710-1785 MHz, DownLink 1805-1880 MHz
That is, in our example, the phone picks up signals from Megafon base stations of the GSM 900 standard (101, 113, 103 channels) E-GSM (1021 channels) and GSM 1800 (638, 632 channels).
Below is the distribution of mobile operators by GSM channels in the Moscow region:
As you can see, Megafon has a rather small resource at frequencies of 900 and the largest at 1800 frequencies. Accordingly, if in Moscow at the office you use Megafon as a corporate operator, then it is recommended to choose a 1800 range repeater.
GSM 900: f(Uplink)=890+0.2*n, where n is the channel number f(DownLink)=935+0.2*n
E-GSM: f(Uplink)=880+0.2*(n-973), f(DownLink)=925+0.2*(n-973)
GSM 1800: f(Uplink)=1710+0.2*(n-511), f(DownLink)=1805+0.2*(n-511)
In our case, these formulas have no practical application.
One GSM channel serves 7 simultaneously talking subscribers. The 1800th range prevails mainly for densely populated areas, i.e. cities, because can serve more subscribers. And the 900th range is used everywhere. The principal advantage of the 900 range is the range of up to 35 km in line of sight, while at the 1800 frequency it is only 8 km.
Now consider the values of the second column of readings on our phone. These are signal levels measured in dBm (English dBm). These values are negative, i.e. -60 dBm is greater than -65 dBm.
Based on our example, we have only one 101st and 638th channels are in the zone of reliable signal reception. Accordingly, if we are talking about a country house, then you should choose a repeater 900, because. Channel 101 is more powerful. And what kind of model will be discussed a little later.
Already at this stage, we can determine what range we need to install a repeater - 900 or 1800. To do this, we need to take measurements of all cellular operators, inserting SIM cards from each of them in turn.
A better way to measure signal strength
The advantage of directional antennas is a large gain, but often the base stations of cellular operators can be in different directions. For more accurate measurement of signals, it is recommended to use a telephone with an external antenna connected. An adapter for an external antenna can be bought on the radio market, sellers know it as an adapter for the Yota Samsung SWC-U200 modem.
How to orient an external antenna?
If you need only one operator, for example, MTS. Then try to capture several channels. For example, it is better to catch 2-3 channels with a signal level of -60 than 1 channel -50, and the rest -70.
If you need to provide a signal from all cellular operators, then try to place the external antenna in such a way that the signal to the repeater input comes approximately the same from all cellular operators, otherwise the range from the internal antennas will be proportional to the incoming signals. For example, the signals of MTS "-70", Beeline "-60", Megafon "-50" get to the input of the repeater, then at the output of the internal antennas we will observe the following situation, as shown below:
Selecting a GSM repeater model
Consider example #1:
- We measured the signal level with a telephone at the point of preliminary installation of an external antenna - 72 dBm (we chose the most powerful channel). The antenna gain is 11 dB, respectively, at the antenna output we have a signal of -72 + 11 = -61 dBm. But it is better to immediately measure the signal from the antenna output, through an adapter to the phone.
- Signal loss in a cable is considered very simply: any cable has its own RF characteristics on the manufacturer's website. For example, 20 dB is lost on 100 meters of 5D-FB cable at 900 MHz. The higher the frequency of the signal, the greater the loss in the cable. You can view the RF characteristics of the cable. In our case, the cable length from the external antenna to the repeater is 10 meters, and the losses are considered: 20 dB is lost at 100 meters, and 2 dB is lost at 10 meters.
- The repeater input receives a signal of -61 - 2 = -63 dB.
- We look at the gain of the repeater in its technical specifications(in our case Ku=70). We get at the output of the amplifier - 63 + 70 \u003d + 7 dBm
- At the antenna output we get +7 (from the repeater output) -2 (cable loss) + 7 (antenna Ku) = + 12 dBm.
ATTENTION: for each channel it is necessary to make separate calculations (having counted 1 channel, the subsequent ones are calculated almost instantly) How to estimate the APPROXIMATE coverage area from an internal antenna? To do this, look at the decibel and watt correspondence table at a 50-ohm load.
dBm | Tue | dBm | mW | |
40 | 10 | 19 | 80 | |
39 | 8 | 18 | 64 | |
38 | 6,4 | 17 | 50 | |
37 | 5 | 16 | 40 | |
36 | 4 | 15 | 32 | |
35 | 3,2 | 14 | 25 | |
34 | 2,5 | 13 | 20 | |
33 | 2 | 12 | 16 | |
32 | 1,6 | 11 | 12,5 | |
31 | 1,25 | 10 | 10 | |
30 | 1 | 9 | 8 | |
29 | 0,8 | 8 | 6,4 | |
28 | 0,64 | 7 | 5 | |
27 | 0,5 | 6 | 4 | |
26 | 0,4 | 5 | 3,2 | |
25 | 0,32 | 4 | 2,5 | |
24 | 0,25 | 3 | 2 | |
23 | 0,2 | 2 | 1,6 | |
22 | 0,16 | 1 | 1,25 | |
21 | 0,125 | 0 | 1 | |
20 | 0,1 | -1 | 0,8 |
Our +12 dBm corresponds to 16 mW. Further, to simplify the calculation, we multiply our number of mW by a factor of 4 and get the APPROXIMATE coverage area from our antenna 16 x 4 = 64 sq.m. in open space. In the presence of walls and partitions, the area may be several times smaller.
The Picocell 900 SXA repeater has a gain of 70 dB and a maximum output power of 100 mW according to the passport. But in our case, the output power turned out to be only 5 mW out of 100 possible.
In the case of GSM 1800 and 3G/UMTS2100 systems, to determine the INDICATED coverage area, it is recommended to multiply the obtained output power by 3, because at higher frequencies, there is a higher attenuation of the signal in the propagation medium.
The calculation method turns out to be quite simple: knowing initially the area of \u200b\u200bthe premises that we need to cover, and having measured the signals from the base stations of cellular operators, we can calculate the energy balance of the system and choose the right repeater model.
Videos on how to install cellular signal amplifiers can be viewed
Example #2 using a power splitter
This system uses two internal antennas. One covers an area of 25*4=100 sq.m. (which produces 14 dBm at the output), and the second 50 * 4 = 200 sq.m. (17 dBm output). For signal distribution, an unbalanced divider was chosen with 10 dB side attenuation, and 1 dB in a straight line. This is done in two cases:
- Compensate for cable losses to the far antenna in rooms of the same area
- It is more rational to distribute the signal power to cover rooms of various sizes.
Signal amplification in the E-GSM range
All Picocell 900 repeaters are not originally designed for E-GSM frequencies. But due to the imperfection of the filters, it is partially affected. Approximately it looks like the figure below. Each model has its own repeater gain, the figure shows the characteristic of the Picocell 900 SXA.
With repeater Q 70: 1024 channel will be amplified by 70 dB, 1023 by 69, 1022 by 68 and so on. The 1014th channel approximately comes with a gain of 48-50. We try not to take into account the rest of the channels up to 1014th.
When choosing a repeater, try not to save on equipment. Take antennas with large gains, and try to take the cable with a large cross section if possible. All this will allow you to get the maximum result after installing the system.
As a matter of fact, having this knowledge, you can independently select and install a GSM repeater.
We invite you to discuss all questions on this topic on our forum.