Dataradio Gemini PD Panduan Servis - Halaman 5

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1. PRODUCT OVERVIEW

This document provides the information

required for the operation and maintenance

of the

Gemini/PD mobile radio-

DATARADIO

modem.

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 radio-modem 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 a GPS receiver, determines posi-

tion, speed and direction of fleet mem-

bers.

The Gemini/PD is made-up of a main

transceiver and a auxiliary receiver for

Parallel Decode (PD), a 40 Watt power

amplifier, a Gemini Control Unit (GCU) with

DSP driven modem and an integrated OEM

GPS receiver.

120 20110-003 PRELIMINARY

Features:

•

Rugged water-proof die-cast aluminum

chassis.

•

Data speeds of 9600 to 19200 b/s

(9600 b/s maximum in half channels)

•

3 available user ports using standard

RS-232 interface

•

Built–in 16-channel synthesized radio

transceiver.

•

Power output of 10W to 40W (software

controlled).

•

Half duplex or simplex operation.

1.3

Configuration

Operating characteristics of the Gemini/PD

are configured by Dataradio System

Engineering for communication protocols

and network settings.

A Radio Service Software (RSS) is provided

for radio/modem maintenance, adjustments

and frequency programming. The RSS is

MSDOS based and will run on any 486 or

higher PC (2 Megabytes memory required).

WARNING: The frequency band 406 to

406.1 MHz is reserved for use by distress

beacons and cannot not be programmed into

the unit.

Gemini/PD Technical Manual