The LTE Combiner Amplifier increases the quality of sending and receiving 4G/3G/UMTS mobile radio signals. The device is interconnected between 8 LTE/UMTS/HSPA+ modules maximum in Viprinet Multichannel VPN Routers and two mobile radio antenna, and is able to compensate for distances of up to 23 m between router and antenna without any signal loss. To avoid signal confusion, it is recommended to use SIM cards of four different mobile phone providers. In addition, the device concentrates mobile radio signals on one antenna output, so the entire installation only needs one antenna. The LTE Combiner Amplifier is connected to up to eight antenna outputs of the LTE/UMTS/HSPA+ modules in a Multichannel VPN Router. The signal is increased to such an extent that signal loss on a cable between router and MultiAMP Combiner is totally balanced. However, signal loss occurring behind the antenna output is not compensated. The amplified signals are then concentrated on two antennas output by a combiner level, and sent to the standard mobile radio antennas via another pair of cable which should be as short as possible due to signal loss. In receiving direction, the mobile radio signals are filtered first, then amplified, and at last sent to the respective LTE/UMTS/HSPA+ module. Here, too, only signal loss on the cable between LTE Combiner Amplifier and router is compensated. This device is an asset in all cases where greater distances between antenna and router have to be bridged. These distances often occur when antennas are installed in sight of a radio cell to optimize transmission and reception performance. The LTE Combiner Amplifier increases signal strength in buildings as well as in vehicles. Due to its solid metal frame of small dimensions, it can be installed everywhere.

The amplifier includes:

• Automatic Gain Control (AGC) on uplink and downlink.
• Amplifier automatically shuts down when no up-link signal present. This reduces heat generation.
• Oscillation / Interference detection.

Important information
Due to the fact that mobile phone signals have to be combined, it is necessary either to connect all inputs to an antenna output of a Multichannel VPN Router or to terminate unused input with a resistor.
WARNING: The maximum input levels are to be observed at all times, as disturbance of mobile phone services as well as destruction of the device can occur otherwise!