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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 Control Unit (GCU) with DSP driven
modem and an integrated OEM GPS
receiver.
1.2.1 Features:
•
One-piece integrated design in a rugged
die-cast aluminum chassis.
•
Parallel Decode (PD) technology fea-
turing dual receivers for added decode
sensitivity in multi-path and fading en-
vironments.
•
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 16-channel synthesized radio
transceiver.
•
Power output of 10W to 40W (software
controlled).
•
Data speeds of 9600 to 19200 b/s
(9600 b/s maximum in half channels)
•
3 available user ports using standard
RS-232 interface
•
Half-duplex or simplex operation.
•
Built-in GPS receiver.
•
Out-of-band signaling enables transmis-
sion of GPS reports with no effect on
system performance.
•
Back-compatible with MobilPac/R
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.
