Page 1
After Sales Technical Documentation
NHA–2 Series Transceiver
Chapter 3
TRANSCEIVER
OVERVIEW
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NHA–2
After Sales
Transceiver Overview
Technical Documentation
CHAPTER 3 – TRANSCEIVER OVERVIEW
Contents
Introduction Page 3–3
Block Diagram Page 3–3
Power Distribution Page 3–4
System Software Page 3–4
Page 3–2
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Page 3
After Sales
NHA–2
Technical Documentation
Introduction
The NHA–2 series is an advanced analog handportable cellular telephone for
operation on the E–AMPS cellular system. The design is fully compatible with
the AMPS Mobile Station / Land Station specification. The telephone contains
many advanced user facilities and is designed for ease of maintenance.
The transceiver electronics consists of radio module (baseband and RF blocks)
and display module. Display is connected to radio module with a connector.
Baseband (system) and RF blocks are interconnected with PCB wirings. Transceiver can be connected to accessories with a bottom system connector, which
includes charging and accessory interfaces.
The NHA–2 transceiver contains a H8/3042 microcontroller with internal 64 kB
ROM and 2 kB RAM. For tuning values and phone numbers there is a 2 kB EEPROM memory.
Block Diagram
Transceiver Overview
DUPLEX
FILTER
RF BLOCK
RX
RX
SYNTE
SYNTE
TX
TX
90 MHz
14.85 MHz
RSSI
DAF
VCXO
MOD
STBY CONTROL
RF CONTROLS
14.85 MHz
AFC
DISPLAY
BB
ASIC
NASTA
SYSTEM BLOCK
2.4 MHz
DISPLAY
MCU
KEY–
BOARD
M2BUS
MIC
EARPIECE
BUZZER
The system block provides the MCU environment, baseband IC (NASTA) and
EEPROM memory. The baseband IC (NASTA) consists audio processing and
modem functions. On board power supply IC (MUUMI) circuit delivers operating
voltage for system blocks and reference voltage for RF.
The microcontroller, Hitachi H8, communicates with the baseband ASIC with
the 8–bit data bus.
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NHA–2
After Sales
Transceiver Overview
The RF block is designed for handportable phone which operates in AMPS system. the purpose of RF block is to receive and demodulate the radio frequency
signal from the base station and to transmit a modulated RF signal to the base
station.
See more detailed description from baseband and RF block diagrams.
Power Distribution
The power supply is based on the ASIC circuit MUUMI. The chip consists of
regulators and control circuits providing functions like power up, reset and
watchdog. The MCU and MUUMI circuits control charging together, detection
being carried out by the MUUMI and higher level control by the MCU. The MCU
measures battery and charger voltage aswell as the temperature and size of
the battery.
The detailed power distribution diagrams are located to system module document.
System Software
Technical Documentation
The whole main software is located in the internal OTPROM or mask ROM of
the controller. The main parts of the software are:
– OS operating system
– LN local network (MBUS driver)
– CS cellular system signalling
– UI user interface
– DEV device control, battery charging, compensations,
local I/O, permanent data storing, MBUS interface
– HW hardware drivers
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After Sales
NHA–2
Technical Documentation
Transceiver Overview
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