- memory scroll and recall in alphabetical or numerical order
- writing in memory during a call
Repeat: last dialled number or one of 15numbers from the quick-memory locations
Product: TDP70WN / General
5.9.2000
1.1.7 Clock
- time and date display
- real time alarm setting
- real time power on setting
- real time power off setting
- elapsed conversation time counter (both incoming and outgoing)
- received call counter and time display
1.1.8 Auto Answer; Pager/Hands Free
- pre-set number of ring tones before answering (0...6)
Pager
- answers incoming calls and receives numeric messages
- 15memory locations (23 characters / location)
Hands Free
- answers incoming calls when connected to portable HF
1.1.9 Other Functions
DTMF - receiver / transmitter
DTMF - key tones
Display and key illumination
Volume control
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Product: TDP70WN / General
5.9.2000
- 5 levels
- level indicator
Battery charge level indicator
- battery empty alarm tone and display
- used battery capacity display
Field strength indicator
Battery-saving function
Prefix editor
Keys lockable to prevent accidental operation
Phone code to prevent una u thorised use
SIS protection function
CLIP, calling line identity presentation
‘+’ international prefix
You can program Benefon Dragon by using either the keys on your phone, or
the BeneLoc computer program and maintenance adapter. In either case, you
will need a localbox.
Programming Menu Commands:
- SALES DATE
- RADIO PATH ID
- OWN NUMBER
- PHONE CODE
- Y1 Y3 ID (additional operator indicator)
- SW VERSION
- SAK
- PRODUCT CODE
- UPDATE LOCALBOX
- INTERLEAVING
- AUTOMATIC ROAMING
- RESET RAM
3.1.1 Programming Subscriber ID in Dragon
3.1.1.1 How to program the ID in Dragon:
1. Turn on the Dragon normally with its own battery.
2. Hook up the rapid charger until it the phone indicates that it has started
charging.
6DP_70GB.fm
3. Remove the battery and watch that the display shows an empty battery
frame.
4. Hook the localbox adapter up to the localbox via the Spica cable, and then
attach it to the phone where the battery would normally go.
5. Restart the Dragon.
6. You can get to the ***BENEFON*** menu with the arrow key. Select it, and
from there you will find "Radio Path ID", where you can program the ID of the
phone.
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Product: TDP70WN / Installation Instructions
5.9.2000
3.1.2 To program Using the Phone Keys
1. Connect the QPS50 localbox via maintenance adapter to your phone, and
turn the phone on. , will be flashing in the display in stand-by mode.
2. Press and the following text wi ll appear in the displa y: ***BENEFON***.
3.1.2.1 Sales Date
1. Choose SELECT. The following text will appear in the display:
SALES DATE [XXXXXX].
2. Choose CHANGE. [XXXXXX] will be replaced by the date
[daydaymonthmonthyearyear]. Remember to check that the date is correct.
If the date is correct, choose
choosing
daydaymonthmonthyearyear). To save the date, choose
and enter the correct date (six digits in the following form:
SAVE. If the date is incorrect, delete it by
SAVE.
It is possible to program the sales date ONLY ONCE, which means that you
will not be able to change it again afterwards. If the sales date has not been
programmed, your phone will not enter the normal stand-by mode.
3.1.2.2 Radio Path Identification
1. Press , an d the fo llowing text will appear in the display:
RADIO PATH ID [XXXXXXXXXX].
2. Choose
save the identification by choosing
radio path identification is correct.
CHANGE. Enter the radio path identification (ten digits), and
3.1.2.3 Own number
1. Press : own number [+ XXXX...X]
2. Choose CHANGE. Enter the own number (follo w the instruction of the
operator), and save it by choo sing SAVE. Remember to check that the own
number is correct.
Note! SMS doesn’t work if the own number has not been programmed.
SAVE. Remember to check that the
3.1.2.4 Phone Code
1. Press , and the following text will appear in the display:
PHONE CODE [XXXX].
2. Choose CHANGE. Enter the phone code (four digits) , and save th e code
by choosing SAVE.
3.1.2.5 Y1 Y3 ID (Additional operator indicator)
It is possible to change old/add new operator indicator which operates in
automatic roaming mode. (network selection mode: Automatic)
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Product: TDP70WN / Installation Instructions
5.9.2000
1. Press : Y1:X Y3:XX ID: ABC
2. Choose SELE CT . Enter Y1 (Country code: one digit) and choose
SAVE.
Enter Y3 (Operator code: two digits) and choose SAVE.
Enter ID (Operator indicator, 3 characters) and choose SAVE.
3.1.2.6 Automatic roaming and Interleaving
The Dealer activates or deactives them according to the operator’s or the
customer’s likings.
3.1.2.7 Closing Instructions
1. Having programmed the necessary information choo se QUIT, and the
following text will appear in the di splay: ***BENEFON***.
2. Turn off your phone, and disconnect the localbox.
3. Turn the phone on once more, and make a test call.
3.1.3 To program Using the BeneLoc Program
power
5V log
gen
flash
5V log
meter
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Start the installed program by clicking the icon. The phone must be connected
to the system as discribed above.
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Main window
Product: TDP70WN / Installation Instructions
5.9.2000
Press Dealer-key to enter the programming window.
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You can read the phone data by pressing the Read phone -key. You can
change the miscellanous settings with the computer and transfer them to
phone by pressing the Program phone -key.
BeneLoc includes Help-program for further information.
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4.0 BeneLoc
BeneLoc
Product: TDP70WN / BeneLoc
5.9.2000
power
5V log
gen
flash
5V log
meter
BeneLoc program is desi gned to hel p service person o n tuning and service purp ose.
With Flasher Program you can change the software to Benefon phones.
Both, BeneLoc and Flasher program will need Service Adapter, Power Supply and
Localbox with service rights to work.
4.0.1 Installation of BeneLoc program
Start Windows. Close all other programs except Program Manager.
Insert BeneLoc Installation Disc 1 in the floppy disk drive of your computer. In the
Program Manager window, choose Run from File menu.
Ty pe the letter A: or B: to indicate your floppy disc drive, and then type SETUP.EXE.
For example, A:\SETUP.EXE.
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Click the OK button, and follow the instructions displayed on your screen.
The Setup Program will ask you to specify the drive and directory in which you want
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to install the BeneLoc Program. The P r ogram suggests the following: C:\Bene-App\BeneLoc. Accept the drive and director y by cli cking Next button. You can also
type your own directory for BeneLoc Program .
The Setup Program creates all nec es sary directories and subdirectories to your
computer. Setup Program also creates its own group window in Program Manager.
4.0.2 To start the BeneLoc program
Connect the Servic e Localbox to serial po rt of you r co m put er, which is called COM1
or COM2. The serial ports are usually located in the back of your computer, and
more precise instructions can be found in the manual accompanying the computer.
Adjust the Power Supply voltage to 4.0 Vdc. Connect the Service Localbox to the
Power Supply.
Connect the Servic e Adapter to the phone. Pl ug the cabl e with flat conn ector into the
connector at the bottom of the phone. When the cable has been connected and the
phone is switched on, the phone should be in LOCAL mode. You can test this by
pressing arrow button. There should be ***BENEFON*** on the di splay, if not, clean
connectors and try again. When phone is in LOCAL mode you can start the BeneLoc Program.
Product: TDP70WN / BeneLoc
5.9.2000
To start the BeneLoc Program, double click the BeneLoc icon.
In the BeneLoc Startup window, first sele ct th e correct serial p ort. The n, you ha ve to
select type of the phone. You can also use the Autodetect option. After selection
click OK to start Be neLoc Program. When operating without external power sup ply
the phone may be on sleep m ode an d r egi str a ti on f ai ls . You can wake up the phon e
by pressing some buttons on the phone.
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4.0.3 Using the BeneLoc program
In the main window of the BeneLoc, you will find submenus and buttons. Clicking the
buttons you can go to the submenus.
Change
For changing phone to another similar you do not need to do more than enter into
main menu. It means that this button is not needed. If you are going to change the
tested phone to one having different software in, clicking Change will start the registration protocol again.
Product: TDP70WN / BeneLoc
5.9.2000
Help
Dealer
About BeneLoc submenu will tell you version of the BeneLoc Program and also the
state of memory.
About Cellular submenu will show you information of t he phone. Type of phones
software, sales date, date of the software, serial number and present tuning values
of the phone. You can not change the tuning values from Help menu.
From Dealer submenu you can make or check programming of the phone. You will
also find the SIS information from Dealer submenu.
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Service
Product: TDP70WN / BeneLoc
5.9.2000
You can control the audio lines (for e xample , switch Rx aud io and com pan der on /off )
in the Service mai n menu . It is al so possible to contro l the ph one to de sired ch annel.
There is also possible to change the power of transmitter.
In the Ports submenu is you can see the status of different digital ports. There is
also possible to control some of the output ports.
You can read the status of the A/D converters from the A/D submen u. Select 8 di ffer ent topics to view. By clicking SCAN AD button The Beneloc will scan A/D the state
of converters continuously. Scanning can stopped by clicking ST OP AD .
Memory submenu allows you to make Ram reset.
By clicking Initialize You can clear all LOCAL settings in service menu.
Home button will return you back to main menu.
Tunings
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From Tunings main menu you can select different tunings to do. Every tuning have
they own instruction window. Follow given instruc tions to do tunings. Clicking
START will start tuning. The value will be stored only by clicking SAVE. Some of th e
tunings are chained and you can enter to next phase by clicking NEXT.
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System
File
Product: TDP70WN / BeneLoc
5.9.2000
You select used mobile phone system from this submenu.
From settings submenu you can manually change settings of the communication
port.
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Product: TDP70WN /
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5.0 PHONE’S CONSTRUCTION
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LOGIC / AUDIO
OC2285 Processor/Audio/RF
5.1 PROCESSOR
5.1.1 General
The entire radio: The audio, processor and RF functions are found within a
single OC2200 board, along with the display and keyboard.
The processor controls the audio and radio (RF) parts, internal devices and
external accessories.
Asic for SIS-function, 256k*8 EEPROM + Universal
EEPROM for tuning values
5.1.2 Connectors:
5.1.2.1 Connector for service purposes only
1V-PROGflash programming voltage0.5/12 -14 Vdc
2GEN_OUTPUTrx audio signal output100 mVrms
3CHGDETcharger detector0/VCC digital
4SCLi2c clock0/VCC digital
5SDAi2c clock0/VCC digital
6TXDORS232 output0/VCC digital
7GEN_INPUTtx audio signal output200 mVrms
8RXDORS232 input0/VCC digital
5.1.2.2 Headset connector, V2
1HFMICmicrophone signal input10 mVrms
2HEADSETheadset detector0/VCC digital
3HFERPearphone signal output100 mVr ms
4GNDground
20..31connected to the voltage components
32GNDground
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5.1.2.7 Circuit Diagram
The processor, audio and RF circuits diagram is split into seven parts. Signals
in the circuit diagrams have been given names, and signals with the same
name are connected between diagrams (<x> = page).
Page1 of 7module connector pins
5.1.3 Functions
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
2 of 7power supply + display
3 of 7µCBIC, EPROM, SIS-function
4 of 7audio parts
5 of 7synthesizer
6 of 7receiver
7 of 7transmitter
5.1.3.1 µ CBIC
I3 is itself a processor-asic circuit. It is comprised H8/300H-cpu, 10k*8 CMOS
RAM, 8 A/D, 4 D/A, 48 pcs I/O lines, 3 series-interfaces, 2 modem-interfaces,
i2c-interface, frequency counter, realtime clock, timers and 4,8 MHz clock
oscillator. The µCBIC divides this by 4 to get timing signal E.
When the process or is operating, RESET = VCC, VCC = 2.8 V, E = 1.2 MHz.
5.1.3.2 Memories
Memory and external I/O-circuit address coding is done with the µCBIC circuit
I3. The circuit options CE, OE and WE are 0-active.
The program memory is in 8 Mbit Flash memory 29DL800.
RAM-memory is 10k*8 CMOS RAM and included in the µCBIC. µCBIC uses its
own power suppl y voltage which i s VRAM a nd is al ways oper ating, eve n when
the radio is in the OFF state.
5.1.3.3 The Modem
The FFSK modem is located in the audio circuit. The modem is connected to
the µCBIC by a series line, input to synchronised port, and transmission is
controlled by an µCBIC series output. The modem gives a 1200 Hz signal
RXCLK and TXCLK to the µCBIC. There is a data detector within the modem,
the speed of which is controlled by C57. The µCBIC A/D converter measures
the level of acceptance from ERPDET line. The same detector also serves to
control HF fu n c ti on.
5.1.3.4 AFC
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The AFC function is performed by an internal µCBIC frequency counter. A 450
kHz intermediat e frequency is amplified to a square-wave form by Q5. The
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frequency is adjusted by µCBIC D/A 1 signal. This approx. 1.5 Vdc voltage is
fed to the synthesiser AFC pin.
5.1.3.5 Sleep Timer
The phone puts the central functions to sleep for a time. Although everything
seems normal to th e user, but mo st of the fun ctions are closed dow n. The radio
and audio units are closed down completely. The processor still has a power
supply, but the processor is halted and has minimal power consumption. Only
the µCBIC circuit sleep timer and its 32 kHz crystal oscilla tor remain in active
mode. The phone is "woken up" by interrupting the sleep timer or by changing
the keyboard state. Th e sleep time r 32 kHz clock fr eque ncy is pr oduced by the
oscillator made by crystal X1.
5.1.3.6 Warm start
C32 and R38 meas ure th e l en gt h of a voltage break. The vol ta ge dr op s dur i ng
a break, after which it is measured by the A/D (AN2) converter. The time
constant is approx. 10 s. Thus a "warm start" is detected.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
5.1.3.7 Reset
The output (VCC) of the main voltage regulator I11 is connected to the power
supply reset monitor I1. The output of I1 resets (stops) the processor and
zeroes the controls when the battery voltage drops below 2.6 V. When the
voltage rises again, the processor restarts.
5.1.3.8 Power Switch
When the power switch is pressed, th e PWRSW line goes to high state and
drives the regulator to operate. The program commences and checks the
PWRSW line to ensure that the switch is being pressed, and sets hold on the
regulator for the PWRON line. Wh en the switch is d ep ressed fo r a lo ng er time,
the program directs power to the PWROFF line. During a short voltage break,
C1 remembers the previous control, i.e. C1 keeps the control voltage high
when the battery voltage is restored within 10 seconds. C1 also serves as a
watch-dog should the voltage drop or processor error-state continue; after 10
seconds, the radio will shut down completely.
Note1! When the phone is operative, the same power power switch acts also
the # key.
Note2! The µCBIC circuits have their own power supply voltage connected to
the battery to e nsu re an u ni nte r rupte d power supply. The µCBIC power su pp ly
is ensured during a battery-back change by the battery B 1.
5.1.3.9 Battery Voltage Measurement
The battery voltage is measured by an A/D converter (AN7). The reference
voltage for the measurement is provided by the main regulator 2.8 V supply.
Calibration is done by the program against a precisely known battery voltage.
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5.1.3.10 I/O ports
The µCBIC I/O ports PA PF are 8-bit hold circuits. Data is fed to the addresed
output. When the RESET line is down (0 V) all the µCBIC ports are ze roed (0V).
As RESET rises again, all of th e two-way I/O p orts are inputs un til the prog ram
sets them to the desired state. With the radio in OFF state, RESET is down so
all of the controls are also down although µCBIC is still provided with
operational voltage VRAM.
5.1.3.11 SIS
SIM is performed by a BENEFON ASIC IG2048 manufactured by Atmel.
Integrated circui t IG 20 48 is E2 logic arra y. Th is typ e o f ar ra y i n corpo ra tes bo th
an electrically erasable and programmable read only memory (EEPROM) and
a gate array for SIM function.
SIM has 256 bytes internal EEPROM di vided to tw o part s: 224 byte s EEPROM
for universal use and 32 bytes EEPROM for SIS calculations are secured by
programmable fuse function.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
User specific information is stored in EEPROM which CANNOT be read from
outside the chip. All external attemps to read the information clear both.
EEPROM and RAM (fill with FF).
5.1.3.12 Power Adjustment
The transmitter control logic switches TX power and also adjusts it to the
correct level. The TXS_REG signal sets the transmitter to ready mode. Power
is controlled by the µCBIC analog output A/D 0 through the TXPWR line. 0 V
corresponds to "no power" and 2.8 V to maximum transmitter power. The
power levels are calibrated by the program at the source of me asurement.
5.1.3.13 Charging Control
The charger is con trol led by th e pro gram. The char ger is detect ed by a volta ge
at the CHGDET pin. The chargin g curr en t is con tro l led w ith Q10 which acts as
a switch. The switch Q10 is controlled by Q4 through the charge_on -line.
5.1.3.14 Temperature Measurement
The radio has one temperature sensor R72, situated just under the battery
pack. Inside the radio the NTC resisto r R72 voltage is measu red by the µCBIC
A/D converter (AN6). This value is converted by a programmed table to a
temperature reading.
5.1.3.15 Real-time Clock
A real-time clock is pr ovided with in µCBIC to give the ti me and dat e. The alarm
function can also be programmed to the ALARM pin. This will initiate the main
regulator and thus also the radio although it is in OFF state.
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The µCBIC circuit has a continuous power supply and th e 3 2 kHz clock crystal
runs constantly. Not even the RESET line stops the clock. If the power supply
has dropped too low, the clock will need to be reset with the radio buttons (from
the menu).
5.2 AUDIO
5.2.1 Function Description
The audio module is comprised of the following functions:
1. TX-audio signal handling
2. RX-audio signal handling
3. Fii signal handling
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
4. FFSK modem
5. DTMF generator/receiver
6. Signal level detectors
7. Compander
8. Expander
9. Buzzer
The audio functi ons are mainly located in a single circuit AK2339. This chip
from AKM is controlled by a serialbus. It is possible to shut down parts of the
circuit, one block at a time to minimise power consumption.
5.2.2 TX-audio
The input from the microphone is fed to the audio circuit I7 pin 61, which is an
operational amplifier (AMP1) inverting input. The operational amplifier gain is
set by resistor s R87 and R89. The amplifier is connected as a low pass filter.
After the amplifier is th e micr op ho ne sw i tch an d the n sum m ing j un c tion of MIC
input signal, EXTMIC input signal and transmit DTMF signal. VR1 is a
programmable am plifier, which sets the microphone signal (sensitivity) to the
correct level. After VR1 comes band-pass filter f or transmitting the voice signal.
A special scrambler circuit I9 can be mounted between the pins 57/58 and 59
of I7. This device is optional and it is controlled also by the serial interface
circuit. TXDET is the transmit voice signal detection circuit which works as a
full wave rectifier. Next comes ATT1 which is an attenuate circuit to set the
transmit signal level in the HF-mode. COMP is the compressor circuit.
Compress the transmitting signal amplitude with square root law. It can be
bypassed. The linearity is adjustable by the control register CVR. Next is VR2,
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normal deviation gain control circuit to set the signal level. The P/E & LIMIT
pre-emphasis circuit and limiting circuit, emphasize the higher frequency
component of the signal in order to improve the signal-to-noise ratio of
modulated signal. This block includes a limiting circuit for signal amplitude in
order to confine the maximum deviation of the transmit modulated signal.
Before TXLPF is the FFSKTX switch. TXLPF is the low pass filter to reject the
higher frequency component on the transmit signal. VR3 is a maximum
deviation gain control circuit to set the transmit signal level. After the VR3
comes switch TXAUDON, which mutes the tx-audio signal using the TXMUTE
control. From the switch, the signal is fed to the summing junction (ADD3) of
the tx-audio signal and Fii-signal. Next comes VR4 gain control circuit to set.
SMF1 is smoothing filter for tx-audio signal. The tx-audio signal is then fed to
the RF-stages.
5.2.3 RX-Audio
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
The rx-audio signal coming from the receiver through the V103 pin 8 is fed to
the audio circuit I7 pin 23. Inside the circuit, the signal is fed to the operational
amplifier (AMP2) inverting input. The amplifier gain is set by resistors R85 and
R95. The signal i s next passed through an anti-aliasi gn filter. VR5 is a gain
control circuit to set the rx-audio signal to the correct level. Next comes deemphasis (D/E) circuit. Equalize the pre-empassized rx-audio signal. The
signal passes from the D/E through the switch RXAUDON. RXBPF is the bandpass filter for the rx-audio signal. RXDET is the rx-audio signal detection circuit.
This circuit works as a full wave rectifier. After the RXBPF comes I8 which is
the split-switch of audiosignal and then expander circuit (EXP). Expand the rxaudio signal amplitude. It can be bypassed. The linearity is adjustable by the
control register EVR. VR6 is a gain control circuit to set the rx-audio signal to
the correct level. After VR6 comes the RXMUTE switch, which is operated by
the RXMUTE control. ADD4 is the summing junction of the rx-audio signal,
external signal (not used), DTMF signal and transmit signal. VR10 is the
volume control circuit to set the level of ea rphone and extern al earphon es. The
scrambler circuit I9 is optional and it is controlled by the serial interface circuit.
The signal is then fed via R91 to the audio amplifier I10. The amplifier drives
the earphone A4 and by controlling the I10 SE/BTL pin, the signal can be
routed to the HF-connector.
5.2.4 FII Signal
The NMT system uses the FII signal to check the radio path quality. This
approx. 4 kHz signal is split from the rx-audio signal after the VR5 and is
filtered through the band-pass filter (FBPF). VR7 sets the FII signal to the
correct level. Switch FILOOPON can be operated by the FIION control, to be
summed with the tx-audio signal before the VR4.
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5.2.5 FFSK Modem
The FFSK data signal from FFSK modulator to be transmitted is passed
through the FFSK low-pass filter and pre-emphasis (FFSKP-EM) to the VR9,
which adjusts its level. The data signal is switched using switch FFSKTXON.
The received data signal is spl it from the rx-audi o signal after th e de-emp hasis
circuit. The data signal is fed through the FFSK band-pass filter to the FFSK
demodulator and FFSK data detector.
FFSK DET block. The block works to judge the FFSK signal existence by
comparing the amplitude of the noise reduced FFSK signal and the provided
detection level standard. Once the detector judges a valid FFSK signal, ’H’
signal is put out on the FFSKDET pin (pin43). The data detector speed is
determined by the external condensator C57.
FFSK DEMOD. To recover 1200 bps receive data and clock from the FFSK
signal.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
The modem is connected to the CPU by series lines, the receiver to a
synchronised gate, and transmission is directed to an ASIC series output. The
modem provides a 1200 Hz clock signal RXCLK to the processor and TXCLK
to ASIC.
5.2.6 The DTMF Generator/Receiver
The DTMF generator provides all sixteen standard DTMF tones, and each
individual frequen cy separately. The gene rator is used to pr oduce both key and
alarm tones and enable numeric message transmission during a call.
Key and alarm tones are taken from the generator to switch DTMFRXON and
is summed with the rx -a ud io sig nal. Key tones are connected t o earp hone and
external earphones.
When transmit ting a numeric message, the DTMF tones produced b y the
generator are fed through the VR8, which set the DTMF signal level to the
switch DTMFTXON, and then the signal is summed with the tx-audio signal.
The DTMF receiver takes in numeric messages sent to the phone. The route to
the DTMF receiver splits from the rx-audio signal after the summing junction
ADD4.
5.2.7 Signal level detectors
Audio signal level detectors are required for the HF-function to measure the
transmitted and received audio signal level, and to study the data signal level.
Measurement is done by rectifying the signal, and the resultant DC voltage is
read by a phone’s prosessor A/D conve rter. TX DET is at the tran smission side
detector and RXDET is at the receiver side detector.
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5.2.8 Compander/Expander
Compander and expander units are included in audio asic I7 and can be
controlled by registers.
5.2.9 Alarm buzzer
Tones for the internal alarm tones are provided by the DTMF generator. The
internal alarm tones path way is DTMF generator, VR8, switch DTMFRXON,
summing junction ADD4, VR11, AMP5 and buzzer. The buzzer volume is
controlled by t he DA3.
5.2.10 The other in audio asic (I7)
OSC is the main oscillator and clock divider for the prosessor.
CLKBUF is clock buffer generate clock out from main clock.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
INTERFACE & DATA REGISTER is a 16 bit address/data serial interface
circuit.
BIAS is bias current generator for amplifiers.
TIMER is an 8 bit timer (not used).
DA1, DA2, DA3 are 8 bit linear DA converters.
5.2.11 Scrambler (optional)
The CD264 I9 is a frequency domain scrambler comp atible with NMT cellular
phone system. It contains separate TX and RX paths for full duplex operation
and operates under µProcessor control via a serial interface. The circuit is
optional.
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RF
5.3 RX SYNTHESIZER
5.3.1 General
The RX synthesizer generates an upper side injection frequency for the receiver.
The injection frequency is fed to the receive r ’s first mixer.
Operating voltage3.0 VDC
Current consumptio n14 mA
Output level to the receiver+1 dBm
Frequency range541.450...545.9 25 MHz
5.3.2 Functional Description
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
The RX injection frequency is generated with a phase locked loop. The VCO produces the injection frequency determined by the control voltage. After the VCO
stage comes the amplifier stage Q430. After the amplifier stage, part of the sign al is
fed to the synthesizer cir cuits I400 divider. The synthesizer circuit co ntains a prescaler, programmable divider, reference frequency divider, and a phase detector.
The synthesizer circuit produces current pulses at output DO1 as controlled by the
phase detector. The current pulses either charge or discharge the loop filter. The
VCO control voltage is derived from the loop filter output.
The synthesizer 12.5kHz reference frequency is made by dividing the 13.00 MHz
signal from the temperature compensated oscillator (TCXO). The series-form signal
which control s the ch anne l fr equen cy come s fro m the proc essor. SDA TA, SCLK and
SLE signals are common to both TX- and RX-synthesizers. A positive pulse in the
SLE line loads the division ratio (corresponding to the frequency of the channel) fed
to the SDATA line, to the synthesizer circuit I400.
5.3.3 Control- and Output-Signals
VRXRX synthesizer operating voltage3.0 V
SCLKClock signal for the synthesizer control data
SDATASynthesize r control data
SLEENABLE pulse to the synthesizer
RXINJRX synthesizer output to the receiver+1 dBm
RX_REGControl line for VRX-regulator
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5.4 TX-SYNTHESIZER
5.4.1 General
The TX synthesizer generates the final modulated transmission frequency, which is
fed to the transmitter.
Operating voltage3.0 VDC
Current consumption<30 mA
Output level to the transmitter+6 dBm
Frequency range453.000...457.475 MHz
5.4.2 Function Description
The TX frequency is generated with a phase locked loop (PLL). The VCO produces
the injection frequency determined by the control voltage, and the VCO also has a
modulation input. After the VCO stage come two amplifier stages Q470 and Q480.
These ensure separation between the VCO and transmitter, and also boost the
injection level sufficiently. Part of the signal is fed from between the amplifier stages
to the synthesizer circuit I400 pre-scaler input Fin2. The synthesizer circuit contains
a pre-scaler, programmable divider, reference frequency divider, and a phase detector.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
The synthesizer circuit produces current pulses at output DO2 as a result of the
phase detection. The current pulses either charge or discharge the loop filter condensators. The VCO control voltage is derived from the loop filter output.
The synthesizer 12.5kHz reference frequency is made by dividing the 13.00 MHz
signal from the temperature compensated oscillator (TCXO). The series-form signal
which controls the channel frequency comes from the processor. SDATA and SCLK
signals are co mmon to both TX- and RX -synthesizers. A positive pulse in the SLEline loads the division ratio (corresponding to the TX frequency of the channel) fed to
the SDATA line, to the synthesizer circuit I400.
Modulation is fed to the TX synthesizer TX-AUDIO line. The frequency response is
corrected by the components R455 - R458, C454 and C455. Modulation sensitivity
is set by the resistor R459.
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5.4.3 Control- and Output-Signals
VTXSTX synthesizer operating voltage (3.0 V)
TXAUDIO Transmitter audio signal
13MHz13.00 MHz signal to the receiver circuit.
SCLKClock signal for synthesizer control data
SDATASynthesizer control dat a
SLEENABLE pulse to the synthesizer
TXINJTX synthesizer output to the transmitter (+6 dBm)
AFCAFC control voltage from AF/LOGIC-board
TXS_REGControl line for VTXS-regulator
5.5 RECEIVER
5.5.1 General
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
The module contains all FM-receiver functional blocks.
RF-amplifier3SK284
1. mixerbalanced mixer
1. IF-amplifier3SK284
FM IF systemSA 607 includes the following blocks:
2. mixer
IF limiter
quadrature detector
RSSI (received signal strength indicator)
When the RF signal is received it is brought through the duplex filter to the amplifier
stage Q500. The amp lified signal is passed th rough the attenuator to the balanced
mixer.The balanced mixe r is ma de by using discret e components, diode D5 10 and
RF-transformer M510.
The upper side injection frequency is brought from the synthesizer through a small
resistive attenuator to the mixer. The 78.45 MHz intermediate frequency from the
mixer output is fed through the IF- filter X520 to the FM IF-circuit I550.
RX injection frequency 541.450...545.925MHz
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Injection-level/impedance +1 dBm / 50 ohm
The second inte rmediate-freqency local-oscillator-frequency required by the FM IF-
circuit is generated by multiplying the 13.00 MHz reference-oscillator frequency by
six. The multiplier circuit is made with transistor Q530.
The second intermediate frequency is 450 kHz. The phase-shift required by the
quadrature detector is ma de wit h th e L550 . The dete cted AF-s ignal temp eratur e correction is done in the buffer amplifier stage.
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5.5.2 Input- and Output-Signals
RF input from the duplex filter463.000...467.475 MHz
RXINJRX injection signal to the balanced mixer
13MHz
VRXRX operating voltage 3.0V from the regulator
450 kHzOutput from 2. IF to the AFC detector
RXAUDIOReceiver audio output 175mVrms
RSSI
SENSITIVITY CHECK
channelRF inputSINAD psof.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
13.00 MHz signal to the multiplier for the
2.mixer
Received signal strength indicator output
0,5...2V
001-113 dBm>20 dB
180-113 dBm>20 dB
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5.6 TRANSMITTER
5.6.1 General
Operating voltage3.5 ... 4.5 v
Current consumptio nmid power max. 1.1 A
Input level from the synthesizer +6 dBm
Output level to the duplex filtermid power 33 dBm (2.0W)
Frequency range453.000...45 7.4 75 MHz
5.6.2 Function Description
The transmitter unit is comprised of three amplifier stages and two attenuator
stages. The pre-amplifier Q620/Q621 and power module I650 form the transmitter
amplifier chain. The attenuators surrounding the pre-amplifier are included to
enhance the electric separation between the TX synthesizer and the transmitter.
Product: TDP70WN / OC2285 Processor/Audio/RF
5.9.2000
low power max. 0.45 A
low power 24.7 dBm (0.3W)
The operationa l am plifi er I640 and transi stor s Q6 41 a nd Q6 42 se rve a s a pow er re gulator circuit, which adjusts the power level so that the voltage from the transmitter
power detector (D660) and the control voltage TXPWR from the audio/processor
unit are equal.
The negative bias voltage for the power amplifier is generated from the 13 MHz
TCXO signal.
I610 amplifies th e sign al for the sw itche d power suppl y Q610 /D61 0 and is the n reg ulated by the z enerdiode D611.
I600 serves as voltage regulator for pre-amplifier and for the negative voltage
generetor.
Q631 serves as the ON/OFF switch for the output power.
5.6.3 Control- and Output-Signals
VBAT
TXBIASPower ON/OFF control
TXPWR
TXINJRF signal from the TX synthesizer+6dBm
TXDUPLEXTransmitter output to the duplex filter
Transmitter operating voltage from the
battery-pack (fused )