Nokia 232, 239 Service Manual bsh1
After Sales Technical Documentation
BOOSTER KIT
BSH–1
Original, 09/94
NMP Part No. 0275111
Booster Kit BSH–1
After Sales
Technical Documentation
AMENDMENT RECORD SHEET
Amendment
Number
Date Inserted By Comments
Original, 09/94Page 2
After Sales
Technical Documentation
Booster Kit BSH–1
BOOSTER KIT BSH–1
CONTENTS
Page No
Introduction 5
General 5
Technical Specifications 5
Modes of Operation 5
External Signals and Connections 5
X100 (RF_in) 5
X101 (RF_out) 5
X500 to Junction Box (D25) 5
DC Characteristics 6
Supply Voltages and Power Consumption 6
Control Signals 6
AC Characteristics 6
Tx Input from Phone 6
Tx Output to Antenna 6
Power Levels 7
Power Levels Tolerance 7
Spurious Signals at Antenna Connector X100 7
Standby State 7
Transmit State 7
TXC Power Level Control Signal 7
VC Booster Enable 8
RX Branch from X100 to X101 8
Functional Description 8
General 8
HFJ and Booster 8
Booster 8
I/O Map EEPROM Contents 9
Circuit Description 9
Receiver Path 9
Original, 09/94 Page 3
Booster Kit BSH–1
Technical Documentation
Transmitter Path 9
RF Circuits 9
Power Level Control Circuit 10
Transmitter Enable Circuit 10
Power–off Circuit 10
Watchdog Truth Table 10
Supply Voltage Circuits 11
HOOK/SDA Buffering 11
Parts List 15
Assembly Parts 21
After Sales
List of Figures
Figure 1: Block Diagram 12
Figure 2: Component Layout Diagram (side 1) 13
Figure 3: Component Layout Diagram (side 2) 14
Figure 4: Exploded View 21
Figure 5: Circuit Diagram 23
Original, 09/94Page 4
After Sales
Technical Documentation
Introduction
General
The Booster Kit comprises the following main items: Booster BSH–1;
Mounting Bracket MBM–3; Front Cable SCE–2; Extension Cable SCE–3;
and RF Extension Cable XRH–1. The Booster Kit upgrades the signal
output level of the phone to that of a full–powered mobile ie approx. 3W.
Note that only the Booster unit is covered in this booklet; the three cables
and the mounting bracket are included under non–serviceable
accessories.
Technical Specifications
Modes of Operation
With power off, only the VBAT supply (+12 V) is available; the VBAT
supply feeds the final amplifier stage.
Booster Kit BSH–1
With power on, mains switch (V218) is conducting, all voltages (+12 V, +8
V, +5 V) are on.
With the transmitter on, all voltages are on and the RF level is detected
from an input sense circuit, hence the TX control voltage to the power
amplifier primary stage is also switched on.
External Signals and Connections
X100 (RF_in) RF connector in
X101 (RF_out) RF connector out
X500 to Junction Box (D25)
Pin Name Description
1 HOOK OUT Hook line from hook–switch
3, 17 GND Supply ground (–)
4, 16 +VBAT Supply voltage from vehicle battery (+)
6 VC HFJ supply voltage to HP, used to carry
”power_on” command to booster
11 TXI/SCL EEPROM clock line in startup, transmitter error
line
18 HOOK/SDA EEPROM data line from HFJ box startup, hook
line to HFJ.
23 TXC Pulse Width Modulated (PWM) power level
control from phone to booster.
24 SGND Signal ground to HFJ box.
Original, 09/94 Page 5
Booster Kit BSH–1
P
Level
Technical Documentation
DC Characteristics
Supply Voltages and Power Consumption
Signal Min, Type Max. Unit Notes
+12V 1.0 1.2 1.5 A dc Maximum
+8V 20 25 30 mA dc
+5V 5 7 10 mA dc
Control Signals
Signal Pin Notes
TXC X500/23 TX power level control. HP control of booster gain.
Value is fed to booster by PWM signal. Line is taken
from processor port P92/PW1(pin 63) to bottom
connector J1/2
After Sales
ower
HOOK X500/18 HOOK line to HFJ/EEPROM serial dataline, line is
acting as dateline during power up sequence and rest
of time it is a HOOK line.
TXI/SCL X500/11 Transmitter error line/EEPROM serial clock line. TXI
indicates if the transmitter of the booster is working
properly (”0” means transmitter error and ”1” means no
transmitter error). During power up sequence the line is
reserved for EEPROM serial clock.
AC Characteristics
Tx Input from Phone
Type Analogue radio frequency signal
Frequency range 872 – 905 MHz
Nominal Level 34.5dBm
Tolerance
Tx Output to Antenna
Type
Analogue radio frequency signal
Frequency range 872 – 905 MHz
Nominal Level 34.5dBm
Tolerance
Original, 09/94Page 6
After Sales
Technical Documentation
Power Levels
Booster Kit BSH–1
P0
P1 30.5 dBm / 1.12 W
P2 26.5 dBm / 0.45 W
P3 22.5 dBm / 0.18 W
P4 18.5 dBm / 71 mW
P5 14.5 dBm / 28 mW
P6 10.5 dBm / 11 mW
P7 6.5 dBm / 4.5 mW
Power Levels Tolerance
Spurious Signals at Antenna Connector X100
Standby State
TX band <–60 dBm
RX band <–70 dBm
Otherwise:
100kHz–1GHz
34.5 dBm / 2.82 W
+2/–4 dB
<–57 dBm
1GHz-4GHz <–47 dBm
Transmit State
RX band <–80 dBm
Otherwise:
100kHz–1GHz
1GHz-4GHz <–30 dBm
TXC Power Level Control Signal
Type PWM
Level CMOS
Frequency 4.8 kHz
Load impedance >50k
Number of duty
cycle steps:
<–36 dBm
255
Original, 09/94 Page 7
Loading...