User's Manual

APPLICANT: MOTOROLA SOLUTIONS EQUIPMENT TYPE: ABZ89FC5812B
109AB-5812B
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
Function of the Power Amplifier Module
Note: The PA module is not applicable in a GPW 8000 Receiver.
The power amplifier (PA) is a forced convection-cooled RF power amplifier. It accepts a low-level modulated RF signal
from the transceiver module, and amplifies it for transmission through the site transmit antenna. Also, to complete the
Cartesian correction loop (linearization method), it provides a low level RF feedback signal to the transceiver module to
achieve the required transmitter linearity.
Transmit power output can be set using Configuration/Service Software (CSS). See 4.4.10 Configuring Tx Power Values
and Battery Type, page 4-32.
The power amplifier also performs functions related to the fan module, including reporting of the fan module status and
supplying power to the fan power bus.
The power amplifier is comprised of six internal modules:
• Core Board
• Converter Board
• Driver Amplifier Board
• Final Amplifier Board
• Distribution Board
• Output Circuitry
Power Amplifier Module