Alan Tectalk User manual

Tectalk
SERVICE MANUAL
2-WAY PORTABLE
HANDHELD
PMR 446 RADIO
Nov. 07. 2001
ALAN Electronics GmbH

CONTENT
1. GENERAL
1.1 General
1.2 Characteristic
1.3 Composition
2. SPECIFICATION
2.1 General Specification
2.2 Electrical Specification
3. OPERATION
3.1 Key Name
3.2 ICONS on LCD
3.3 Key Functions
3.4 Setting and Operation
4. ADJUSTMENT
4.1 Frequency synthesizer
4.2 Transmitter
4.3 Transmitter Test
4.4 Receiver
4.5 Receiver Test
4.6 Symptoms, check point & Correction
5. DESCRIPTION OF RADIO CIRCUIT
5.1 Frequency Synthesizer
5.2 Receiver
5.3 Transmitter
6. BLOCK DIAGRAM
7. SCHEMATIC
8. COMPONENT PARTLIST
9. ASSEMBLY DRAWING AND PHOTOGRAPH
10. CHANNEL DATA (With Sub-channel data)

1. GENERAL
1.1 GENERAL
This equipment, Tectalk is called 2 way portable handheld radios.
The frequency range is 446.00625 to 446.09375MHz, UHF operating channelsfor
Europe-wide used 2 way portable radios according to PMR-446 Standard.
1.2 CHARACTERISTIC
a) All active device in this radio is composed of semiconductor and high
density IC.
b) To design this radio in compact and weight approximately 140g including
battery.
C) CPU of this equipment is HD4048812B from HITACHI.
d) It's power can operate by use of alcaline 4 cell (1.5V AAA) battery.
1.3 COMPOSITION
This radio is composed of following.
a) Transmitter (W/Antenna)
b) Belt clip
2. SPECIFICATION
2.1 GENERAL SPECIFICATIONS
a) Frequency Range : 446.00625 to 446.09375 MHz
b) Output Impedance : 50 Ohms Unbalanced
c) Modulation Type : 8K50F3E
d) Communication Mode : Simplex
e) Channel Capacity : 8channel
f) Channel spacing : 12.5 KHz
g) Power : 6.0V(ALCA 1.5V x4AAA)
h) Battery Life : ALCA.1000mAh > about 35hours
NI-MH 600mAh > about 22hours
( TX 5% ,RX 5% ,Standby 90% )
i) Operating Temperature : -20°C to +55°C
j) Dimension : 95.5(H)x 50(W)x 26(D)mm
k) Weight : 120g(with Battery)
2.2 ELECTRICAL SPECIFICATION
a) TRANSMITTER
1) Output power : Max. 0.5W
2) Frequency Stability : +/-5PPM (-20°C to+55 °C)
3) Modulation Method : FM
4) Oscillation Method : PLL SYNTHESIZER
5) Max. Frequency Modulation : < +/-2.5 KHz (with tone)

6) Cooling Method : air-cooling Method
7) Spurious Emission TX : < -36dBm
8) FM Hum/Noise : > 40dB(1kHz 60% modulation)
9) Distortion : < 5% (1kHz 60% modulation)
10) Tx Audio Response : 6dB /OCT +/-3dB PRE-EMPHASIS(300Hz to 2.5kHz)
b) RECEIVER
1) Receive Method : Double Super Heterodyne
2) Receive Sensitivity : -118dBm up (20dB SINAD W/CCITT)
3) Squelch Sensitivity : -120 to -130dBm (Audio on/off point)
4) Bandwidth : > 8.5KHz
5) Adjacent channel rejection : >55dB
6) Local Frequency Stability : +/-5PPM (-20°C to +55°C)
7) Spurious Response Rejection : >65dB
8) Audio output : 200mW(8 Ohms load THD 10%)
9) Distortion : < 5% (1kHz 60% Modulation)
10) RX Audio Response : 6dB/OCT +/-10dB DE-EMPHASIS(300Hz to 2.5kHz)
11) S/N Ratio : >40dB(1kHz 60% modulation)
12) IF : 1'st IF = 21.7MHz
2'nd IF = 450kHz
13) Local Frequency : 1st Local Frequency = fc -21.7MHz
2nd Local Frequency = 21.25MHz

3. OPERATION
3.1 Drawing of the radio
FUNCTIONS AND CONTROLS
1) Battery Door 11) Down Button & Volume Control
2) Monitor Button 12) Function Button
3) Detachable Belt Clip 13) Power On/Off & Enter Button
4) Push-To-Talk (PTT) Button
5) Antenna
6) External Mic / Speaker
7) Built-in Speaker
8) LCD Panel
9) Built-in Microphone
10) Up Button & Volume Control

3.2 ICONS on LCD
1) RSSI (Receiving Signal Strength Indicator) or TX Bar Icon
Indicates the receiving signal strength during transmission and it can
be indicated the number of bar according to the strength of receiving
signal. It (TX Bar) is not transformed.
2) Monitor Indicator
Appears when the monitor button is used.
3) CTCSS Indicator
Blinks when the correct CTCSS tone is entered.
4) Auto Channel Scan Indicator
Appears in the auto scan mode or when the auto scan mode is
activated.
5) Dual Watch Scan Indicator
Appears in dual watch scan mode or when the dual watch scan mode
is activated.
6) Key Lock Indicator
Blinks in auto lock selection mode or when the key lock is
activated.
7) VOX Indicator
Blinks in VOX selection mode or appears when VOX is activated.
8) Battery Level Indicator
Battery Level Meter indicates the remaining battery strength.
Blinking when the Battery charge strength is Low-cell only and then red
LED Blinking at every 5sec.
When the TOT Penalty is Warning Beeping at initial activation and not
Transmit at 10sec.
9) Tx Indicator
Appears when a signal is being transmitted.

10) Rx Indicator
Appears when a signal is being received.
11) Large Segment Display
Indicates the channel number in use at the normal mode.
When the Function Button is pressed, it Displays the function menu
in sequence :
CH /ctc/SC /dW /VO/Vdt /ALo /CAL /tON /tAL / bEP
12) Small Segment Display
Displays the CTCSS tone option at the normal mode.
CTCSS option is displayed in Hz.
Displays the SUBMENU of each MENU in the function mode.
(e.g. CH 1 to 8/ ctc: 1to 38, OFF / SC: up, dn, OFF / dW: 1to 8, OFF /
VO: High, Mid, Low, OFF / Vdt: 5sec, 3sec, 2sec, 1sec / Alo: OFF, Auto /
CAL number: 1 to 7,OFF / tON:no, Freq / tAL: On,OFF / bEP: On,OFF)
3.3 Key Function
3.3-1 ENTER BUTTON (#13)
1) Short Touch -Power On
-Press this button (#13) briefly to turn the unit on.
A short confirming melody will play.
2) Long Touch -Power Off
Press this button (#13) for longer than 1.5 seconds to turn the
unit off.
Press it to confirm the required option for respective functions
during function edit mode.
3.3-2 FUNCTION BUTTON (#12)
1) Short Touch
-Press this button briefly to enter function edit mode in standby
mode.
2) Long Touch
-Press for longer than 1.5 seconds to activate the KEY LOCK in the
standby mode.
Please note all buttons will be disabled except the Monitor
Button (#2) and PTT Button (#4) will remain fully operational.

3.3-3 UP BUTTON (#10)
1) Short Touch
-In the standby mode, press this button briefly to move to the next higher
main volume level.
In the function edit mode, press briefly to shift from the current option
in each submenu to the next option in the same submenu.
2) Long Touch
-Pressing this button for more than 1.5 seconds will allow you to navigate
at a more rapid rate through different volume level in the standby mode or
through different menus in the function edit mode.
mode.
3.3-4 DOWN BUTTON (#11)
1) Short Touch
-In the standby mode, press this button briefly to move to the previous
lower main volume level.
In the function edit mode, press briefly to shift from the current option
in each submenu to the previous option in the same submenu.
2) Long Touch
-Pressing this button for more than 1.5 seconds will allow you to navigate
at a more rapid rate through different volume level in the standby mode or
through different menus in the function edit mode.
3.3-5 PUSH-TO-TALK (PTT) BUTTON (#4)
-Press it firmly and speak into the Built-in Microphone (#9) to transmit.
The red Tx LED Indicator at the right side of the LCD Panel (#8) will
light.
-Release it to revert to standby mode. When an incoming call is received,
the green Rx LED Indicator on the left side of the LCD Panel(#8) will light.
-2-Way Call Ringer:
Press the PTT Button twice quickly to call another party on the same
channel. The word CALL and the Tx icon will appear in the display.
The user selected call ringer melody will play.

3.3-6 MONITOR BUTTON (#2)
-Press it to check activity on the current channel before you try to
transmit.
-Adjust the Volume Control (#10, #11) if necessary.
-When you press the Monitor Button, the LCD Panel (#8) will be illuminated
with an amber color back-light and both the Tx and Rx LED indicators will
light.
-It can be activated by pressing Monitor ,up/down ,enter and function key.
-If you press the Monitor Button during the function edit mode, you will
return to standby mode directly.
-To setup Auto Monitoring ,press Monitor key for three seconds.
3.3-7 EXTERNAL MIC/SPEAKER (#6)
-This jack accepts an optional headset/microphone for totally handsfree
operation.
Please refer to the enclosed Accessory Order Form to order accessories.
See also section regarding VOX SELECTION MODE.
3.4 Setting and Operation
3.4-1 BASIC CHANNEL SELECTION
In order to communicate with other sets,both you and the receiving party
Must be on the same channel.
The set has 8channels (1-8) as indicated by the large digits in the LCD
Display Panel (#8). Before, trying to transmit on the selected channel,you
should press the Monitor Button (#2) to check the activity on that channel.
If someone is already on the selected channel, you should try another channel
that is clear.
To change the basic channel,
-In the standby mode, press the Up Button (#10) briefly to move to
the next higher main channel number.
-Press the Down Button (#11) briefly to move to the next lower
main channel number.
3.4-2 CTCSS (Coded Tone Controlled Squelch System) SUB-CHANNEL
SELECTION MODE
This feature allows you to utilize a less used channel range (01-38) within
a main channel. This enables you to communicate with another party on the

same main channel using the same subcode.This helps to avoid congestion on
the main channel and filters out unwanted noise and static.
There are 38 CTCSS subchannels for each main channel.
To change the CTCSS subchannel,
-Press the Function Button (#12) until the word cTc appears in the LCD
Panel (#8).
-Press the Up Button (#10) or the Down Button (#11) to choose the desired
subchannel to use. The corresponding subcode frequency will be displayed
in the lower right corner.
-Press the Enter Button (#13) to confirm your selection.
NOTE: To communicate with other PMR units,they must be switched to the same
channel and CTCSS subcode.
To communicate with other PMR units that do not have subcodes,
switch your unit to the same channel with the subcode set to OFF.
3.4-3 AUTO CHANNEL SCAN MODE
This feature allows you to scan for an active channel and communicate with
the party transmitting.
To access the Auto Channel Scan menu,
-Press the Function Button (#12) until the auto channel icon blinks
and SC appears in the LCD Panel (#8).
-Press the Up Button (#10) or the Down Button (#11) to choose scanning up or
down from the current channel number.
-Press the Enter Button(#13) to confirm your selection.
-The unit will begin scanning for an active main channel. It is able to
transmit by scan start channel during scanning.
-When the scan release , the unit will be standby in scan start channel during
Scanning.
-Press briefly the Monitor Button , It allows you to skip over current channel
on the scan list. On the other hand press long the Monitor Button , It allows
you to delete current channel on the scan list.
-To turn off the auto channel scan feature in the standby mode, simply press
the Function Button(#12) once.
3.4-4 DUAL WATCH SCAN MODE
This feature allows you to monitor two different channels at the same time.
If you pre-set any priority channel other than the current channel in use, the pre-set
channel will be scanned every 0.5 second and signals you when a call is received.
To access the Dual Watch Scan menu,
-Press the Function Button (#12) until the dual watch icon blinks and dW