Instruction Manual

Table Of Contents
1.2
GTR 8000 Base Radio Components
Table 1: Base Radio Modules and Function
Base Radio Description
Power Supply 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.
Power Amplifier (PA) 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.
Transceiver (XCVR) Provides the control, exciter, and receiver functions for
the base radio.
Transceiver Option Card 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.
Fan Provides intermittent forced air cooling for the power am-
plifier and transceiver modules.
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
MN003286A01-H
Chapter 1: GTR 8000 Base Radio Description
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