User Guide

TRANSCEIVER

11/97JR

7–2

NHC–4

Technical Documentation

Transceiver

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Introduction

The NHC–4 is a dual mode handportable Cellular phone for North American

dual mode TDMA system. Reference for specifications are IS–55A ”Recom-

mended Minimum Performance Standards for 800 MHz Dual–Mode Mobile

Stations” and IS–54B ”Dual–mode Mobile station – Base station Compatibility

Standard”, RSS128 ”800 MHz Dual–Mode Cellular Radiotelephones” and

”CTIA Certification program”.

NHC–4 offers analog mode and digital mode full rate speech services defined

in IS–55A and analog mode asynchronous data services. It provides nine trans-

mission power levels in digital mode and six in analog mode at a maximum

power level of 0.6 W +2/–4 dB in power class IV. The transceiver has a retract-

able antenna and a connector for external antenna. User communicates with

phone via LCD–display, keybord and some audible tones.

NHC–4 can be connected to different accessories e.g. chargers, holders,

hands–free units, data–adapters and handset through the bottom system con-

nector. NHC–4 can also be connected to a RF booster, which increases trans-

mit power to full mobile power level class I. NHC–4 supports three different bat-

tery options: NiCd standard and NiMH high capacity and slim battery.

The transceiver consist of four modules: UIF module, system module, battery

pack and mechanics.