User's Manual

Transceiver Ports (Rear)
The transceiver interconnects to the backplane using a 120-pin HVDML digital connector and 8-pack RF connector,
as shown in the figure. These connections handle multiple signals including power supply communications, power
amplifier communications, fan interface, and peripheral interface. The digital connection receive alarm data and the
site controller Time Division Multiplexer (TDM) signals used to pass reference and control data to the base radio.
Figure 9: Transceiver Module (Backplane Connections)
• Single Receiver Input: An RJ-45 Ethernet port on the backplane is cabled to a site LAN switch for this channel.
The backplane also provides an RF connection to the transceiver for receive (Rx) path A.
• Dual Receiver Input: RJ-45 Ethernet ports on the backplane are cabled to corresponding ports on the site
controller backplanes (HPD). The backplane also provides RF connections to the transceiver for receive (Rx)
paths A and B (HPD and TDMA).
Function of the Power Amplifier Module
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 Configuring Tx Power Values
and Battery Type on page 151.
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.
Figure 10: Power Amplifier Module
66 | GTR 8000 Base Radio Theory of Operation
Send Feedback | November 2013 | 6871024P71-A
Applicant: Motorola Solutions
Equipment Type: ABZ89FC5810B / 109AB-5810B
Exhibit D (Permissive Change)