What is a cell phone signal amplifier?
Cell phone signal amplifier is designed to solve the blind signal designed for mobile phone products. As the mobile phone signal is transmitted by electromagnetic waves to establish a communications link, the building of the barrier, in some tall buildings inside the basement of some places such as malls, restaurants, places of entertainment such as karaoke OK sauna and massage, underground civil air defense projects, subway stations and many other places, cell phone signals can not reach and can not use the phone. Cell phone signal amplifier can solve these problems in a particular place as long as the installation of a mobile phone signal amplifier system, the entire range of mobile phone signals can be well used,
To which staff or customers great convenience.
How it works:
Cell phone signal booster for mobile phone signal is too weak in the area, as relay stations to use, professional name of the repeater.
Is a good cell phone signal outside outdoor antenna cable through the access methods (amplified by booster system) directly into
Room, and then introduced through the indoor antenna to the signal sent to the phone. At the same time to receive mobile phone signals, upload it to the base station.

Downlink: Outdoor Yagi can call to receive a useful signal (the role of the general cell phone display 4), input to the host, the host sent by amplified indoor ceiling antenna, and then through the antenna radiation, to the user's mobile phone, this is down.
Uplink: user mobile emission signal was absorbed ceiling antenna input to the host, and then amplified by the host, and then sent to the outdoor Yagi antenna, or whip-like launch to the base station, This is the uplink.

The main parameters of this amp
Operating Voltage: 220VAC
Operating frequency range: 890MHz ~ 915MHz (Uplink)
935MHz ~ 960MHz (Downlink)
Gain: 50dB
Power: 17dbm
Noise figure: ≤ 5dB
VSWR: ≤ 1.5 (VSWR)
Device delay: 1μs
Spurious Radiation: ≤-36dBm
Coverage area: 300 square meters covered area of more than
Cell phone signal enhancer dedicated to small regional indoor antenna distribution system (also known as fixed coverage), the base station's signal directly through the introduction of wireless access to the indoor coverage area, then the base station signals through a small antenna to send out the same time to receive mobile phone signals , through the distribution system up to the base station, indoor coverage can eliminate blind spots, interference suppression for indoor mobile communication users to provide stable, reliable signal, so that users can enjoy high quality indoor personal communication services. Mainly used in indoor signal enhancer-point small area coverage, covering indoor GSM (or CDMA) communications blackout,
Its coverage is: no matter one 4DBI Ceiling concealed antenna coverage area of 100 square meters, part of the cover material covering an area of 80 square meters, covering the edge of field effect to the above-85dBm.
1 Scope of application:
l small signal blind area or weak signal areas, such as underground or semi-underground place of business, small basement, underground parking, etc.;
l complaints of small hot signal areas such as meeting rooms, a small supermarket and small shopping centers, offices, small public areas, etc.;
l telephone traffic and social impact of a large area: bars, cafes, dance halls, cafes, fitness clubs, leisure and entertainment and so on.
l lift, especially not respect the well laid cable lift elevator.
l home, office, luxury yachts, private car, public security and road safety management, etc.
2 Features
l high-gain linear power amplifier;
l automatic level control
Cell phone signal amplifier installed Note:
1, an outdoor antenna installation position must be able to clear the call, Yagi installation must be installed horizontally.

2, eight wood and ceiling pull the antenna as possible, more than 8 meters, not in the same line of sight in order to avoid self-excited, the general use of the wall to do a typical isolation, effective.

3,75-7 coaxial F head is usually transferred to the host, should be an absolute guarantee F head fasteners, and fully grounded, this effect is more obvious.

4, F 75-7 inch line for the head must also be supporting 75-7 coaxial line, or it will not install problem.
Q:
1, cell phone signal amplifier will not produce radiation, affect health?
A: Certainly not. The power equipment since it is not, the maximum relative GSM phone transmit power, only 1 / 20, very small.

2, power, and the two lights are not bright?
A: AC power supply is likely to be unreliable, it is recommended another outlet.

3, the signal over Georgia, playing no phone, but can play in, what problems?
A: The reason for the cell phone emitted the signal transmission to the base stations are not well led, many reasons, generally by adjusting the direction of the Yagi, such as 360-degree rotation, choose a good angle, and then fixed. If it still does not resolve, then consider whether the connection and long or loose joints, and fasten in place. General outdoor section of line not more than 20 m suitable indoor section of line not more than 10 m right.

Accessories prices

Yagi directional antenna a 70 per
Indoor Ceiling Antenna 1 35 yuan 4DBI
75-7 coaxial cable 15m 3 Yuan * 15
N turn first 4 F 6 yuan * 4
F 4 1 per head * 4