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BRU3 LOGIC AND RADIO SYSTEM

17 (34)

BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07

6

Radio System

Figure 5

Radio system block diagram.

LNA

Amp

Amp

Amp

3 pole

Mixer

Mixer

Mixer

X-tal filter

450 kHz

VCO

Synth ic

Filter

Filter

Buf

fer

Rx Synthesizer

Interface

Logic/Radio

S

D

ATA

SCLK

SSTBTX

SSTBRX

SSTBMOD

REFCLK

A8-A0

D7-D0

READ

WRITE

SEL0

SEL1

ADRD

Y

MODSIG

MODSTB

Helena Ic

Osc cont

T

e

m

p

D

is

c

R

ssi

P

r

P

f

T

x o

n

T

x

p

o

w

e

r

M

o

d

V

C

O

M

o

d

to

x

c

OCXO

1/2

x6

1/26

Synth Ic

Synth Ic

Filter

Filter

DET

DET

DET

OP-amp

TCXO

VCO

Buf

fer

Buf

fer

Isolator

Power

Control

Power

Amp

Directional

Coupler

Duplex filter

492 kHz

78.8 MHz

Rssi

READ

WRITE EN

VBA

T

Memory

818-824 MHz

T

ransmitter

77.25 MHz

42 kHz

38.4 MHz

TX Synthesizer

Antenna

12.8 MHz

Pr

Pf

11/LZEA

801 350 R3

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Содержание MOBITEX BRU3

Страница 1: ...14 5 3 Dual Port Memory 14 5 4 Signal Processor Unit with Memory 15 5 5 Console Ports 15 5 6 LEDs 15 5 7 Reset Button 16 6 Radio System 17 6 1 Radio Parameters 18 6 1 1 Frequency Band 400 MHz HRB 104...

Страница 2: ...rom the use of this document 6 2 5 Radio Control Circuit 23 6 2 6 Filter 23 7 Power Supply Equipment 24 7 1 Power Supply Unit 25 7 1 1 AC DC Module 25 7 1 2 DC DC Module 25 7 1 3 Battery Charge 26 7 1...

Страница 3: ...and is designed for the 400 800 and 900 MHz frequency band The BRU3 which may be installed outdoors and indoors is a link between the mobile terminals MOB and the area exchanges MOX in the Mobitex Net...

Страница 4: ...ll as a cooling flange offering good thermal management for the BRU3 The FTF comprises FE Case Bottom Frame FBF 1 FE Case Top Frame FTF 5 Weather protected throughputs for the cabling FE Connection Bo...

Страница 5: ...BRU3 LOGIC AND RADIO SYSTEM 5 34 BRU3 MANUAL Doc no 155 16 ANNA 805 08 Uen Rev H 2003 02 07 Figure 1 Base Radio Unit BRU3...

Страница 6: ...llowing subsections briefly describe the modules that are directly involved in the traffic flow and signal processing to be outlined below Other hardware is described further on in this section 3 1 Lo...

Страница 7: ...Uen Rev H 2003 02 07 3 2 Radio Unit Modules The BRU3 Radio Units contains the following boards 3 3 Power Supply Equipment FRB FE Radio Board FFM FE Filter Module FPU FE Power Supply Unit FBU FE Batter...

Страница 8: ...X telephone modem V 32 balanced serial interface V 24 V 11 RS422 unbalanced serial interface V 24 V 28 RS232 Figure 3 Line interface block diagram V24 V28 V24 V11 DAA Adaptation Board Console Boot Sou...

Страница 9: ...se refer to FE Computer Board FCB in the BRU3 Mechanical Design section Data communication between a base station and an area exchange MOX is using data connections with a X 25 protocol X 25 protocol...

Страница 10: ...eased or switched lines are used for data transmission The maximum transmission rate is 14 400 bits sec The modem is connected to the computer part via a synchronous serial circuit Asynchronously tran...

Страница 11: ...luded in the interface The same signals appear both for V 11 and V 28 I O Signal CCITT V 24 Circuit No Description GND 101 Protective Ground SG 102 Signal Ground TD 103 Transmit Data RD 104 Receive Da...

Страница 12: ...able shows the signals used Pin Connector P4 V 28 RS232 Connector P5 V 11 RS422 1 Protective Ground 101 Protective Ground 101 2 TD 103 TD 103 3 RD 104 RD 104 4 RTS 105 RTS 105 5 6 7 GND 102 GND 102 8...

Страница 13: ...including memory Memory for main CPU Dual port memory Signal processor unit SPU with memory Console ports LEDs for Watchdog alarm and status indication Reset button Switch 2 SW2 for setting line inte...

Страница 14: ...ere is also a Boot Flash PROM The program file for this area is loaded to the Flash PROM via the console port using a VT100 compatible portable PC For more information please refer to Software Commiss...

Страница 15: ...The FCB contains two ports for serial communication both handled by the integrated circuit Z16C35 Port A implies complete synchronous functionality and also limited modem support By the FNB and FMB t...

Страница 16: ...n use a long and narrow non conductive object pen or similar A reset of the FCB may be generated for the following reasons 1 Power on reset The reset is generated at power on and also when a power dro...

Страница 17: ...SDATA SCLK SSTBTX SSTBRX SSTBMOD REFCLK A8 A0 D7 D0 READ WRITE SEL0 SEL1 ADRDY MODSIG MODSTB Helena Ic Osc cont Temp Disc Rssi Pr Pf Tx on Tx power Mod VCO Mod toxc OCXO 1 2 x6 1 26 Synth Ic Synth Ic...

Страница 18: ...e Introduction and Product Specification section in the BRU3 General module Radio data transmission rate 8 kbps Modulation modified GMSK Traffic mode duplex Channel bandwidth 12 5 kHz Sensitivity 117...

Страница 19: ...C6 For a list of all Product Numbers please refer to the Introduction and Product Specification section in the BRU3 General module Frequency range Tx 864 0 870 0 MHz Rx 819 0 825 0 MHz Duplex spacing...

Страница 20: ...or a list of all Product Numbers please refer to the Introduction and Product Specification section in the BRU3 General module Frequency range Tx 935 0125 940 9875 MHz Rx 896 0125 901 9875 MHz Duplex...

Страница 21: ...ynthesizer output signal is isolated from the transmitter power amplifier by two buffer amplifiers These buffer amplifiers will prevent the power amplifiers from altering the signal when the transmitt...

Страница 22: ...iltering is obtained in a ceramic filter after the LNA The signal is down converted to 77 25 MHz in a double balanced high level mixer A Local Oscillator LO signal to the mixer is generated by the rec...

Страница 23: ...r for the receiver Control of the radio and trimming of the modulation index of the transmitter is performed by D A converters in the circuit Alarm and other signals from the radio part RSSI Temperatu...

Страница 24: ...he BRU3 power supply parts are located in the FE Case Bottom Frame FBF The power supply parts include the FE Power Supply Unit FPU and the FE Battery Unit FBU The FE Heating Unit FHU located in the FE...

Страница 25: ...he FHU 7 1 Power Supply Unit The FPU includes the following main parts AC DC module DC DC module Battery charge DC alarm supervisor control Lightning protection Connectors Switches LEDs Status indicat...

Страница 26: ...V or 5 V is outside normal value the FPU will indicate this to the FCB This failure mode will also be indicated on the FPU 7 1 5 Lightning Protection The FPU is equipped with a lightning protector wh...

Страница 27: ...ature range The battery is designed to withstand continuous charge LED Colour Function MAINS Yellow Lit when incoming 120 or 230V AC power is OK 14V Yellow Lit when 14V DC power distribution to the ra...

Страница 28: ...RU3 is within set limits The unit consists of the FE Heating Board FHB including a heating regulator a heating element and an overheating protection device When the temperature on the surface of the F...

Страница 29: ...MAINS INLET IEC 120 230V AC input from BRU3 site power supply 1 RX ANT TNC Signals from the receiving antenna RX 2 TX ANT ALT RX TX ANT TNC Signals to the transmitting antenna TX Signals to from the c...

Страница 30: ...RX TX antenna is used i e in case an optional duplex filter is installed The ground connection is to be found on the outside of the BRU3 Figure 7 BRU3 external connections 1 RX Antenna 2 TX Antenna 3...

Страница 31: ...kbps Alternative 3 Communication interface V 32 Communication baudrate Max 9 6 kbps Alternative 4 Communication interface V 32bis Communication baudrate Max 14 4 kbps Console NODOP connection Number o...

Страница 32: ...which is the normal state PREBOOT will check whether or not the Flash area is valid If the area is valid the control of execution will be handed over to the BOOT program If the area is not valid the s...

Страница 33: ...MAIN block is an application program that implements the Mobitex network services i e packet switching subscription authorization creation of traffic logs and monitoring operation The MAIN block also...

Страница 34: ...34 34 BRU3 MANUAL BRU3 MANUAL Doc no 155 16 ANNA 805 08 Uen Rev H 2003 02 07...

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