Nokia 252 General Information ch2

Programme’s After Market Services

NHA–3 Series Transceivers

Chapter 2

General Information

Issue 2 06/98

NHA–3

PAMS

General Information

Technical Documentation

CONTENTS

Introduction 2 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Module 2 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

UI Module 2 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Modules 2 – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Accessories 2 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Specifications 2 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transceiver General features 2 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Specifications 2 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver branch 2 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Transmitter Branch 2 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Synthesizer Rx branch 2 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Synthesizer Tx branch 2 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page No

Page 2–2

Issue 2 06/98

PAMS

NHA–3

Technical Documentation

Introduction

The PG4 System and PU4 UI module form the heart of the H700 series of
analogue AMPS/NAMPS phones.

The transceiver consists of two modules: a System and a UI module

System Module

The system module consists of the following:–39

– received audio processing
– transmitted audio processing
– data reception and transmission
– channel selection
– modulated RF signal reception and demodulation to baseband; this

signal is used by the UI module to drive the earpeice.

– modulation of the transmitter by the audio received from the micro-

phone located in the UI module.

General Information

– application of the modulated Tx signal to the selected power level

The system module contains a microprocessor, which controls the main
functions of the System and UI modules. For convienence the non–RF
sub–systems are referred to as the ’Baseband functions’, and the RF
sub–systems as the ’RF functions’.

The RF functions provide the RF interface with the cellular system and
demodulated audio signals to the analog sub–system, they also modulate
audio signals from the analog sub–system. The baseband functions cover
both analogue sub–systems (responsible for all audio processing
functions) and digital sub–systems (responsible for all digital signal
processing functions) and the micro–controller/software (responsible for
control and data processing functions).

UI Module

The UI module performs the following functions;–
Display with driving IC;

Backlighting circuits;
Earpiece driver circuit;
Buzzer driver circuit;
Keypad contacts and circuitry;
Accessory interface circuits;
Protection components on charger input.

Amendment 02/99

Page 2–3