A building or a bridge could have been built in between the BTS and the home or business shielding it totally. Because high frequencies are LOS dependant, these factors can change and individuals can be affected drastically. All these factors should be measured and recorded.
The RSSI measurement should be done at a height of not less than 7 meters from the ground. This is the minimum installation height of an outdoor antenna on a cell extender. Ground level RSSI is irrelevant for this purpose. It is imperative that you do have some signal on the site of installation - if there is no signal there is nothing to amplify. But, no signal at ground level does not mean there is no signal, there could be good signal just above the tree line.
What must be achieved? These measurements are curtail in determining what the outdoor gain should be. How many BTS towers in the coverage aria and their situation is information needed in selecting the correct antenna type to communicate between the BTS and the jammer. This criteria is not catered for in DIY kits. Antenna types, their radiation patterns and their strength (Gain) are not common knowledge to the layman. Once this is established, a link budget calculation can be calculated and the correct cell extender recommended. This will ensure a cell extender that does what it is designed to do and that is to give you indoor coverage. Incorrect calculation and unqualified installation will very probably lead to a system that oscillates, creates noise on the network and gives very limited coverage.
Typical signal strength evaluation One bar signal on you cell phone can be amplified to full strength with a cell extender. Signal strength is measure in dBm. Here is a rough guideline that could assist. Remember, this is what the user is experiencing at ground level. He may have full signal on a hill 100 meters from home.
Theoretically using a Coiler TG900 27dBm cell extender with 60dB gain and selected antennas a site with -90dBm can be amplified to -27dBm which will provide coverage to a normal sized home. Between 7~10met radius on the GSM900 frequency is common. Much larger coverage arias have been achieved regularly but one tends to be very careful in sketching coverage when RF is being applied as it is not very predictable and so many variations apply.
Wednesday, February 27, 2013
Tuesday, February 26, 2013
To ensure the technology of phone jammer in good quality
For this kind of mobile phone jammer can be used in many different locations
LaserCraft precision laser rangefinder - The Contour XLRic type, this laser rangefinder is a combination of high precision and far range, is currently on the market the best performance of a handheld laser measurement system. It can successfully measure the following objectives under the premise of maintaining good accuracy to an unprecedented distance: 175 meters to the power line, 400 meters to the telegraph pole, 800 m to the building. The same time, it is a rugged, waterproof instrument encounter rain, snow, fog or sandstorms, you are only working mode selection to "bad weather" mode, your work will not be affected in any way. Use it in bad weather, just like in the good weather as convenient, easy to use. To ensure the technology of phone jammer in good quality.
If equipped with a tripod, it can be used for more precise distance measurement and the precision measurement of the tilt. The Contour XLR uses the latest laser technology, small, lightweight and easy to use, accurate measurement of the target distance. Inclement weather to ensure the instruments in the instrument can still be a reliable work in rain, fog, snow, dust storm weather conditions. The instrument is equipped with a HUD display, side aimed at the edge measurements. Effective instrument for the generic distance measurement of the building structure planning. Maximum measuring distance of 1850 m, 0.1 m accuracy. The Contour XLRi XLR series feature 360 degrees of tilt sensor.
Data processor airborne laser scanning system to collect the data obtained in the field need to carry out the processing to get the information you need. Data processing include: (1) to determine the track on the ground GPS base station and the aircraft GPS rover the measurement data of the joint differential analysis, can accurately determine the flight path (2) laser scanning data processing using random software, instrument manufacturers to provide the GPS track data on the aircraft, the flight attitude data, the laser measurement data and laser scanning microscopy swing angle data of the joint, you'll get the measuring point (X, Y, Z) three-dimensional coordinate data. The stability of signal jammer needs to be commissioned.
In addition, to minimize systematic errors in the installation of the integrated system. Remote sensor and INS, and laser range finder can be mounted in a rigid platform, rigid platform design requirements is to ensure that able to remote sensors, laser range finder and INS between fixed and remain unchanged in the operating process of the installed system, so that systematic errors can be eliminated through adjustment processing integrated system installed 6 laser scanning system characteristics and applications of 6.1 Laser scanning system is characterized by The laser scanning system has the following characteristics: (1) fast laser scanning can quickly obtain a large area of the target spatial information can also be determination of body surface three-dimensional information in a timely manner, to improve measurement efficiency.
LaserCraft precision laser rangefinder - The Contour XLRic type, this laser rangefinder is a combination of high precision and far range, is currently on the market the best performance of a handheld laser measurement system. It can successfully measure the following objectives under the premise of maintaining good accuracy to an unprecedented distance: 175 meters to the power line, 400 meters to the telegraph pole, 800 m to the building. The same time, it is a rugged, waterproof instrument encounter rain, snow, fog or sandstorms, you are only working mode selection to "bad weather" mode, your work will not be affected in any way. Use it in bad weather, just like in the good weather as convenient, easy to use. To ensure the technology of phone jammer in good quality.
If equipped with a tripod, it can be used for more precise distance measurement and the precision measurement of the tilt. The Contour XLR uses the latest laser technology, small, lightweight and easy to use, accurate measurement of the target distance. Inclement weather to ensure the instruments in the instrument can still be a reliable work in rain, fog, snow, dust storm weather conditions. The instrument is equipped with a HUD display, side aimed at the edge measurements. Effective instrument for the generic distance measurement of the building structure planning. Maximum measuring distance of 1850 m, 0.1 m accuracy. The Contour XLRi XLR series feature 360 degrees of tilt sensor.
Data processor airborne laser scanning system to collect the data obtained in the field need to carry out the processing to get the information you need. Data processing include: (1) to determine the track on the ground GPS base station and the aircraft GPS rover the measurement data of the joint differential analysis, can accurately determine the flight path (2) laser scanning data processing using random software, instrument manufacturers to provide the GPS track data on the aircraft, the flight attitude data, the laser measurement data and laser scanning microscopy swing angle data of the joint, you'll get the measuring point (X, Y, Z) three-dimensional coordinate data. The stability of signal jammer needs to be commissioned.
In addition, to minimize systematic errors in the installation of the integrated system. Remote sensor and INS, and laser range finder can be mounted in a rigid platform, rigid platform design requirements is to ensure that able to remote sensors, laser range finder and INS between fixed and remain unchanged in the operating process of the installed system, so that systematic errors can be eliminated through adjustment processing integrated system installed 6 laser scanning system characteristics and applications of 6.1 Laser scanning system is characterized by The laser scanning system has the following characteristics: (1) fast laser scanning can quickly obtain a large area of the target spatial information can also be determination of body surface three-dimensional information in a timely manner, to improve measurement efficiency.
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