Installation Manual

120 20110-141 Gemini
PD
Installation Guide
1
1. PRODUCT OVERVIEW
This document provides the information
required for the installation, operation and
verification of the
DATARADIO
Gemini
PD
mobile radiomodem.
1.1 Intended Audience
This document is designed for use by engi-
neering design, installation, and mainte-
nance personnel.
1.2 General Description
Gemini
PD
is a mobile radiomodem aimed at
the public safety and public utility markets to
meet demand for high speed and high
throughput. It integrates all the necessary
hardware for data-only vehicular installations
up to but not including the laptop PC and its
application software.
Example of applications are:
1. Database inquiry systems.
Small number of brief messages, (usu-
ally from the mobile station) with fairly
long responses.
2. Computer-aided dispatch (CAD).
Large number of messages, (usually
from the base station) with very brief
responses.
3. Automatic Vehicle Location (AVL).
Using built-in GPS receiver, determines
position, speed and direction of fleet
members.
The Gemini
PD
is made-up of a main
transceiver and an auxiliary receiver for
Parallel Decode (PD), a 40-Watt power
amplifier (35-Watt for 800 MHz model), a
Gemini
PD
Control Unit (GCU) with DSP
driven modem and an optional integrated
OEM GPS receiver. *
1.2.1 Features
• One-piece integrated design in a rugged
die-cast aluminum chassis.
• Parallel Decode (PD) technology (patent
pending) featuring dual receivers for
added decode sensitivity in multi-path
and fading environments.
• Sophisticated DSP-based modem design
provides added system performance,
fewer retries and more effective
throughput.
• Automatic channel changing for im-
proved roaming capabilities.
• Built–in, up to 16-channel flash –
EEPROM programmable synthesized
radio transceiver with automatic
channel selection.
• Models with on-air data speeds and
modulation types as follows:
- DGFSK* modulation, rates of 9600
to 19200 b/s in 12.5 or 25 kHz
channel spacing (9600 b/s maxi-
mum in half channels).
or
- SRRC4FSK* modulation, rates of
25600 and 19200 b/s in 25 kHz
channel spacing.
• 3 available user ports using standard
RS-232 interface via built-in multi-
plexer.
• Half-duplex or simplex operation.
• Out-of-band signaling enables transmis-
sion of GPS* reports with no effect on
system performance.
• Back-compatible with MobilPac/R
(DGFSK)* at 9600 and 19200 b/s.
1.2.2 Configuration
Gemini
PD
is factory configured based on
each customer network system require-
ments, usually by Dataradio System Engi-
neering. Configuration is not changeable in
the field without notifying Dataradio.
*
Networks must use common modulation, bit
and baud rates.
*
The Gemini
PD
Lite model has no GPS.