120 20110-142
Gemini
PD
Installation Guide
1
1. PRODUCT OVERVIEW
This document provides the information re-
quired 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 maintenance
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 re-
sponses.
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 maximum
in half channels).
or
-
SRRC4FSK* modulation, rates of
25600 and 19200 b/s in 25 kHz or
16000 and 14400 b/s in 12.5 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 requirements,
usually by Dataradio System Engineering.
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.
