Supported Frequencies For Trunked Iv And D And Conventional Architectures; Supported Frequencies For Hpd; Overview For A Gtr 8000 Base Radio In A Trunked Ip Simulcast Subsystem; Overview For A Gtr 8000 Base Radio In An Astro 25 Repeater Site - Motorola ASTRO 25 GTR 8000 Manual

• ASTRO ® 3.1 Conventional System
• Analog and/or Digital Conventional, Trunked or Mixed-Mode Systems
• Trunked 3600 SmartZone
1.3.1
Supported Frequencies for Trunked IV and D and Conventional
Architectures
The GTR 8000 Base Radio is available in the following frequency bands:
• 700, 800 MHz (700 MHz analog conventional is not available within the U.S.A. or Canada)
• UHF R1 (380–435 MHz)
• UHF R2 (435–524 MHz)
• VHF (136–174 MHz)
NOTICE: RF Distribution Functionality (RFDS) information provided in this documentation
pertains to the RFDS equipment supplied by Motorola Solutions.
1.3.2

Supported Frequencies for HPD

The GTR 8000 Base Radio is available for 25 kHz operation in the following frequency bands:
• 700 MHz
• 800 MHz
1.4
Overview For a GTR 8000 Base Radio in a Trunked IP Simulcast
Subsystem
The base radio captures inbound signals through external receive (Rx) antennas from the subscriber/
mobile radios and then amplifies, filters, and demodulates the signals into voice packets which are
forwarded to a comparator. The comparator processes the received voice packets for a particular call
and forwards the best quality voice packets to the zone core, which routes them to the associated base
radio at each remote site. At a predetermined time, all base radios transmit the voice packets
simultaneously on the same frequency to complete the communication.
A maximum of 30 base radios can be installed per remote site. Each base radio has an Ethernet
connection to a switch at the site for the Network Management interface.
1.5
Overview For a GTR 8000 Base Radio in an ASTRO 25 Repeater
Site
The base radios in an ASTRO
control channel and a number of voice channels at the site. If packet data services are supported at the
site, a number of voice channels can be configured with packet data channel capability. Voice traffic is
routed from each of the base radios to the system for distribution to other sites and is repeated by the
base radios to support other local subscribers. However, data traffic is routed to the GCP 8000 Site
Controller. The site controller routes these packets upstream to the zone core for further processing
and routing.
® Systems
® 25 repeater site are set up in a single trunked site, with one active
Chapter 1: GTR 8000 Base Radio Description
MN003286A01-E
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