Gtr 8000 Base Radio Components; Supported System Configurations; Table 1: Base Radio Modules And Function - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 1: GTR 8000 Base Radio Description
1.2

GTR 8000 Base Radio Components

Table 1: Base Radio Modules and Function

Base Radio
Power Supply
Power Amplifier (PA)
Transceiver (XCVR)
Transceiver Option Card
Fan
1.3

Supported System Configurations

The GTR 8000 Base Radio is available in the following system architectures:
• High Performance Data (HPD)
• Trunked IP Simulcast Subsystems (IV&D)
®
• ASTRO 25 Repeater Site
• Trunked Single-Site Repeater Configuration (IV&D)
• Centralized Conventional Architectures
• Distributed Conventional (Subsystem) Architecture
30
Description
Operates from either an AC or DC input and provides the
DC operating voltage for the base radio. May also provide
a separate battery charger to maintain the charge on a 48
VDC nominal system, positive or negative ground.
Accepts a low-level modulated RF signal from the trans-
ceiver module and amplifies it for transmission through
the site transmit antenna. Also provides a low-level RF
feedback signal to the transceiver module to achieve the
required transmitter linearity. Also performs functions re-
lated to the fan module.
Provides the control, exciter, and receiver functions for
the base radio.
An optional board that attaches to the control board of the
transceiver. Provides an internal 10 MHz frequency refer-
ence. For conventional base radio operation, it also pro-
vides the analog interfaces and WildCard I/Os. The trans-
ceiver option card is available in two categories:
• OCXO (Oven Controlled Crystal Oscillator)
• TCXO (Temperature Compensated Crystal Oscillator)
NOTICE: The OCXO board when initially pow-
ered on takes a few minutes to reach its opera-
tional temperature. During the warm-up period,
if the base radio is configured to use the OCXO
frequency reference, the base radio may report
a frequency reference failure. This alarm condi-
tion automatically clears once the OCXO board
has warmed up sufficiently to provide a stable
reference.
Provides intermittent forced air cooling for the power am-
plifier and transceiver modules.