Tower Mounted Amplifiers TMA

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A Tower Mounted Amplifier (TMA) has a low noise figure and some gain. If it is mounted as closely as possible to the receive antenna, it can improve uplink sensitivity at the antenna, thus increasing the cell radius. There will be an improvement if the radio link is truly noise limited. If the system is uplink interference limited, there will be no improvement using a TMA. A TMA can degrade performance if the gain is set too high. There will be intermodulation effects due to larger signals, such as terminals close to the base station. Best results are achieved when the TMA gain is used to compensate for the feeder loss.

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