User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 2: Description

Page 2-13

4 35 WATT LINEAR POWER AMPLIFIER

The 35 Watt Linear Power Amplifier (LPA), shown in Figure 2-5, works in conjunction with the

STM to amplify the forward path RF signal. The STM is interfaced with the LPA through the D-

sub connectors and wiring harness located at the rear of the RU outdoor cabinet or indoor

mounting shelf. The RF signal is passed to the LPA for amplification and then passed back to

the STM for filtering and output via the STM’s ANTENNA port. The STM also supplies DC

power to the LPA through the same interface.

4.1 Primary Components

The LPA consists of several electronic circuit board assemblies and two fan units that are

mounted within a powder-paint coated sheet metal enclosure. The metal enclosure provides a

mounting point for the electronic components and controls RF emissions. Except for the fan

units, the electronic components are not user replaceable. The LPA is designed for use with the

RU outdoor cabinets and the indoor mounting shelf. All controls, indicators, and switches are

mounted on the LPA front panel for easy access. A carrying handle is provided on the front of

the LPA to facilitate installation and transport.

Figure 2-5. 35 Watt Linear Power Amplifier Module

19731-B