The DTMA1721AVG14A from Communication Components Inc. is a Tower Mounted Amplifier that operates in the AWS and AWS-3 bands of 1710-1780 MHz and 2110-2180 MHz. It provides an adjustable gain from 8 to 14 dB in 0.25 dB steps, has a noise figure of 1.3 dB and an insertion loss of 1.1 dB. The amplifier consists of six band-pass filters, four redundant low-noise amplifiers, bypass failure circuitry, and bias tees. It is dual duplexed to separate the low-power uplink signal from the high-power downlink signal at the antenna port, amplifying the low-level uplink signal using an ultra-low noise amplifier (LNA), and recombining the two paths at the BTS port.
The DTMA1721AVG14A provides protection against lightning strikes via a multi-stage surge protection circuit. It has an optional indoor site control unit (SCU) to power up to 32 AISG modules per sector and to provide all the monitoring and alarm functions for the amplifier system. This amplifier requires a DC supply of 10-30 V and consumes 2 W of power. It is available in a twin TMA package that measures 206 x 149 x 66 mm and has 4x 7-16 DIN Female connectors and an AISG connector.