This manual is intended for use by experienced technicians
familiar with similar types of commercial grade
communications equipment. It contains all required service
information for the equipment and is current as of the
publication date. Changes which may occur after publication
are covered by either Service Bulletins or Manual Revisions.
These are issued as required.
When ordering replacement parts or equipment information,
the full part identification number should be included. This
applies to all parts : components, kits, or chassis. If the part
number is not known, include the chassis or kit number of
which it is a part, and a sufficient description of the required
component for proper identification.
PERSONNEL SAFETY
The following precautions are recommended for personnel
safety:
●
DO NOT transmit until all RF connectors are verified secure
and any open connectors are properly terminated.
●
SHUT OFF and DO NOT operate this equipment near
electrical blasting caps or in an explosive atmosphere.
●
This equipment should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the
schematic diagrams, printed circuit board views, and alignment
procedures contained within.
A personal computer (IBM PC or compatible), programming
interface (KPG-36), and programming software (KPG-74D CPS)
are required for programming.
(The frequency, conventional system features, TX power HI/LOW,
and signalling data are programmed for the transceiver.)
350~390
RF powerType
4.0WTK-3148 C
3
TK-3148
OPERATING FEATURES /操作特性
1. Operation Features
The TK-3148 is a UHF FM Radio designed in both Trunking
Mode and Conventional Mode.
2. Transceiver Controls and Indicators
2-1. Physical Layout
32
1
4
5
8
9
10
2-2. Panel controls
The key on the top and front panel is momentary-type push
buttons. The functions of these keys and knob are explained
below.
11
12
1. 操作特性
TK-3148 是具有集群和常规双模式的 UHF 调频手持机。
2. 手持机的控制和指示
2-1. 主机外形
6
7
13
14
2-2. 控制面板
顶部和前面板上的键是触发式按键。有关这些键和旋钮的功
能说明如下。
15
1 Antenna connector
Connect the antenna here.
2 Rotary encoder
3 POWER switch/ VOLUME control
Turn clockwise to switch ON the transceiver. Rotate to
adjust the volume. Turn counterclockwise fully to switch
OFF the transceiver.
4 Transmit/ Receive indicator
5 Auxiliary (orange) key
6 Battery pack safety catch
Flip this catch to prevent accidentally pressing the battery
pack release latch.
7 Battery pack release latch
Pull back on this latch to release the battery pack.
8 PTT (Push-To-Talk) switch
9 Side 1 key
0 Side 2 key
- S key
= A key
~ 2B key
! C3key
@ Universal connector
Connect the speaker/ microphone here. Otherwise, keep
the supplied cover in place.
1 天线连接器
在这里连接天线。
2 旋转编码器
3 电源开关/音量控制器
顺时针旋转可接通对讲机电源。旋转调整音量。逆时针旋
转到底可切断对讲机电源。
4 发射/接收指示灯
5 辅助 (橙黄色) 键
6 电池组保险钩
扳上这个保险钩以防止意外按下电池组释放栓。
7 电池组释放闩锁
按下闩锁可取下电池组。
8 PTT (按讲) 开关
9 侧面 1 键
0 侧面 2 键
- S 键
= A 键
~
B 键
键
! C
@ 通用接口
在这里连接扬声器/麦克风,否则应把附带的盖板盖上。
4
OPERATING FEATURES /操作特性
TK-3148
2-3. Key functions
Trunking mode
2 Rotary encoder
Rotate this encoder to select your desired call address
(voice calls/dialing) or status (status calls).
4 Transmit indicator
Lights red while transmitting.
5 Auxiliary (orange) key (default setting: None)
Press to activate its auxiliary function.
8 PTT (Push-To-Talk) switch
Press to transmit. Also press to initiate a call if “PTT to
Initiate Call” has been programmed.
9Side 1 key (default setting: Clear)
Press to activate its auxiliary function.
0Side 2 key (default setting: Call)
Press to activate its auxiliary function.
- S key (default setting: Status/ Stack)
Press to activate its auxiliary function.
=A key (default setting:Function Menu)
Press to activate its auxiliary function.
~ 2B key (default setting: Conventional)
Press to activate its auxiliary function. Also press to scroll
left while viewing stack entries.
! C3 key (default setting: Scan)
Press to activate its auxiliary function. Also press to scroll
right while viewing stack entries.
2-3.键功能
集群模式
2 旋转编码器
旋转本编码器选择您所需要呼叫的地址 (语音呼叫/拨号) 或
者状态代码 (用于状态呼叫) 。
4 发射指示灯
在发射中点亮红色。
5 辅助 (橙黄色) 键 (初始设定: 无)
按下可开启该辅助功能 。
8 PTT (按讲) 开关
按下可发射。当编程了“按 PTT 开始呼叫”后,也可按下
开始呼叫。
9 侧面 1 键 (初始设定: 清除)
按下可开启该功能。
0 侧面 2 键 (初始设定: 呼叫)
按下可开启该功能。
- S 键 (初始设定: 状态/堆栈)
按下可开启该功能。
= A 键 (初始设定: 功能选单)
按下可开启该功能。
~
B 键 (初始设定: 常规)
按下可开启该功能。当观察堆栈条目时,按下可向左侧滚
动。
! C
键 (初始设定: 扫描)
按下可开启该功能。当观察堆栈条目时,按下可向右侧滚
动。
Conventional mode
2 Rotary encoder
Rotate this encoder to select your desired channel.
4 Transmit/ Receive indicator
Lights green while receiving a signal. Lights red while
transmitting.
8 PTT (Push-To-Talk) switch
Press this switch, then speak into the microphone to call a
station.
9 Side 1 key
Press to return to Trunking mode.
0 Side 2 key
Press to turn the monitor function ON in order to monitor
your selected channel.
- S key
Press to turn the display and keypad backlight ON.
The backlight remains ON for 5 seconds.
= A key
Press to add/delete channel(s) to/from Scan list.
! C3 key
Press to turn Scan ON (or OFF).
常规模式
2 旋转编码器
旋转本编码器选择您所需要的信道。
4 接收指示灯
在接收信号时点亮绿色。在发射中点亮红色。
8 PTT (按讲) 开关
按下该开关,然后对着麦克风讲话呼叫其他电台。
9 侧面 1 键
按下可恢复到集群模式。
0 侧面 2 键
按下可接通监听功能来监听您所选择的信道。
- S 键
按下可开启显示屏和键盘背景照明。背景照明将保持 5 秒
钟。
= A 键
按此键可向扫描序列中添加信道或从扫描序列中删除信道。
! C 键
按下可启动扫描 (或者停止扫描)。
5
TK-3148
REALIGNMENT /
2-4. Display / 显示
123459678
1 Sub display
displays the strength of received signals.
2 Programming indicator
P appears while in AUX A is being activated.
3MON (Monitor) indicator
MON appears while you are monitoring a channel by pressing
the Side 2 key. (Conventional Mode only)
4 SVC (Service) indicator
SVC appears when a control channel is found. It flashes
while the transceiver is searching for a control channel.
MON
模式组合
SVC
SCN LO
① 子显示字段
显示接收到信号的强度。
② 显示图标
当 AUX A 被激活时显示 P 。
③ MON(监听)指示
当用户按下侧面 2 键监听某一信道时显示“MON”。(只适用
于常规模式)
④ SVC(服务)指示
当找到一个控制信道时显示“SVC”。当手持机正在搜索控
制信道时,此图标闪烁。
5 SCN (Scan) indicator
SCN appears while you are scanning.
6 LO indicator
This icon blinks while in battery warning, if “Always” or
“Always W/beep” is selected in the battery warning
settings.
7 Handset indicator
flashes when you activate call diversion.
8 MAIL indicator
appears while there is data in the stack. It flashes when
there is new data in the stack.
9 Alphanumeric display
displays call addresses, the call
duration timer, data messages, and the current operating
status of the transceiver.
REALIGNMENT
1. Modes
User mode
⑤ SCN(扫描)指示
当用户正在扫描时显示“SCN”。
⑥LO指示
如果在电池电压告警设定中选择“连续”或“连续并有提示
音”,则电池电压不足时,此图标闪烁。
⑦ 呼叫转移指示
当手持机处于转移状态时,此 闪烁。
⑧ 信箱指示
当存储器堆栈中有接收信息时显示 。当存储栈中有新信息
时,此图标闪烁。
⑨ 字母数字显示字段
显示呼叫地址,呼叫过程计时器,数据
信息以及手持机当前的操作状态等。
模式组合
1. 模式
用户模式
Panel test mode
PC mode
Firmware
programming mode
6
Panel tuning mode
Data programming
mode
PC test mode
PC tuning mode
面板测试模式
计算机模式
固件编程模式
面板调谐模式
数据编程模式
计算机测试模式
计算机调谐模式
TK-3148
REALIGNMENT /
ModeFunction
User modeFor normal use.
Panel test modeUsed by the dealer to check the
fundamental characteristics.
Panel tuning modeUsed by the dealer to tune the radio.
PC modeUsed for communication between the
radio and PC (IBM compatible).
Data program-Used to read and write frequency data
ming mode
PC test modeUsed to check the radio using the PC.
Firmware program-Used when changing the main
ming modeprogram of the flash memory.
2. How to Enter Each Mode
ModeOperation
User modePower ON
Panel test mode[A]+Power ON
PC modeReceived commands from PC
Panel tuning mode[Panel test mode]+[S]
Firmware programming mode
The TK-3148 transceiver is programmed by using a personal
computer, programming interface (KPG-36) and programming
software (KPG-74D CPS).
The programming software can be used with an IBM PC or
compatible. Figure 1 shows the setup of an IBM PC for
programming.
5-2. Connection procedure
1. Connect the TK-3148 to the personal computer with the
interface cable.
2. When the POWER switch on, user mode can be entered
immediately. When PC sends command the radio enter
PC mode, and “PROGRAM” is displayed on the LCD.
When data transmitting from transceiver, the red LED is
blinking.
When data receiving to transceiver, the green LED is blinking.
3. 面板测试模式
设定方式,参见调整。
4. 面板调谐模式
设定方式,参见调整。
5. 计算机模式
5-1.前言
TK-3148 手持机使用计算机,编程电缆(KPG-36)和编程软
件(KPG-74D CPS)进行编程。
IBM 计算机或兼容机可以使用编程软件。图 1 显示IBM 计算
机编程的设置。
5-2.连接步骤
1. 使用编程电缆将 TK-3148 与计算机连接。
2. 当接通电源时,立即进入用户模式。当 PC 机发出指令使手
持机进入 PC 机模式时,“PROGRAM”出现在显示器上。
当手持机发送数据时,红色指示灯闪动。
当手持机接收数据时,绿色指示灯闪动。
Notes:
• The data stored in the personal computer must match
model type, when it is written into the flash memory.
• Change the TK-3148 to PC mode, then attach the interface
cable.
注释∶
• 储存在计算机内的数据必须与写入到闪速存储器的格式相匹
配。
• 将 TK-3148 改变为计算机编程模式,然后连接编程电缆。
7
TK-3148
REALIGNMENT /
5-3. KPG-36 description
(PC programming interface cable: Option)
The KPG-36 is required to interface the TK-3148 to the
computer. It has a circuit in its D-subconnector (25-pin) case
that converts the RS-232C logic level to the TTL level.
The KPG-36 connects the universal connector of the TK3148 to the computers RS-232C serial port.
5-4. Programming software KPG-74D CPS Description
The KPG-74D CPS is the programming software for the
transceiver supplied on three 3.5" floppy disks. This software
runs under MS-Windows 98/Me/2000/XP on an IBM-PC or
compatible machine.
The data can be input to or read from the transceiver and
edited on the screen. The programmed or edited data can be
printed out. It is also possible to tune the transceiver.
We recommend that install the KPG-74D CPS for example
to hard disk first then use it.
5-5. Programming with IBM PC
If data is transferred to the transceiver from an IBM PC
with the KPG-74D CPS, the destination data (basic radio
information) for each set can be modified. Normally, it is not
necessary to modify the destination data because their values
are determined automatically when the frequency range
(frequency type) is set.
The values should be modified only if necessary. Data can
be programmed into the flash memory in RS-232C format via
the universal connector.
Flash memory is mounted on the TK-3148. This allows the
TK-3148 to be upgraded when new features are released in
the future. (For details on how to obtain the firmware, contact
Customer Service.)
6-2. Connection procedure
Connect the TK-3148 to the personal computer (IBM PC or
compatible) with the interface cable (KPG-36). (Connection is
the same as in the PC Mode.)
1. Start up the firmware programming software (Fpro.exe).
2. Set the communications speed (normally, 57600 bps) and
communications port in the configuration item.
3. Set the firmware to be updated by File name item.
4. Turn the TK-3148 power ON with the [S] switch held down.
When "PROG 57600" appears, release your finger from the
[S] switch.
5. Check the connection between the TK-3148 and the
personal computer, and make sure that the TK-3148 is in
the Program mode.
6. Press write button in the window. A window opens on the
display to indicate progress of writing. When the TK-3148
starts to receive data. the [P] icon is blinking.
7. If writing ends successfully. the LED on the TK-3148 lights
and the checksum is displayed.
8. If you want to continue programming other TK-3148 s,
repeat steps 4 to 7.
Notes:
●
This mode cannot be entered if the Firmware Programming
mode is set to Disable in the Programming software (KPG74D CPS).
●
When programming the firmware, it is recommend to copy
the data from the floppy disk to your hard disk before update
the radio firmware.
Directry copying from the floppy disk to the radio may not
work because the access speed is too slow.
1. If you press the [Side 1] switch (top of left side) while
“PROG 57600” is displayed, the check-sum is displayed.
If you press the [Side 1] switch again while the check-sum
is displayed, “PROG 57600” is redisplayed.
2. If you press the [Side 2] switch (bottom of left side) while
“PROG 57600” is displayed, the display changes to “PROG
19200” to indicate that the write speed is low speed (19200
bps). If you press the [Side 2] switch again while “PROG
19200” is displayed, the display changes to “PROG 38400”,
and the write speed becomes the middle-speed mode
(38400 bps). If you press the [Side 2] switch again while
“PROG 38400” is displayed, the display returns to “PROG
57600”.
This transceiver is UHF/FM portable transceiver designed
to operate in the frequency range of 350 to 390MHz (C).
2. Circuit Configuration by Frequency
The receiver is a double-conversion superheterodyne with
a first intermediate frequency (IF) of 44.85MHz and a second
IF of 455kHz. Incoming signals from the antenna are mixed
with the local signal from the PLL to produce the first IF of
44.85MHz.
This is then mixed with the 44.395MHz second local
oscillator output to produce the 455kHz second IF. This is
detected to give the demodulated signal.
The transmit signal frequency is generated by the PLL VCO,
and modulated by the signal from the microphone. It is then
amplified and sent to the antenna.
An incoming RF signal from the antenna terminal is passed
through the antenna switch (D102, D103, D104 and D105 are
off) and then the bandpass filter (L215 and L217). High pass
filter HPF (L219) the 1st image response improve. And the
bandpass filter is adjusted by a variable capacitor. The input
voltage to the variable capacitor is regulated by the voltage
output from the D/A converter (IC307). The signal is amplified
by RF amplifier Q207, and passed through the bandpass filter
(L209, L210 and L211). The resulting signal is applied to the
first mixer (Q206), where it is mixed with the first local oscillator
signal output from the frequency synthesizer to produce the
first IF (44.85MHz).
The first IF signal is passed through a crystal filter (XF200)
to remove a adjacent channel signal. The filtered first IF signal
is amplified by the first IF amplifier (Q205) and then applied to
the lF system IC (IC200). The IF system IC provides a second
mixer, second local oscillator, limiting amplifier, quadrature
detector and RSSI (Received Signal Strength Indicator). The
second mixer mixes the first IF signal with the 44.395MHz of
second local oscillator output (crystal unit X200) and produces
the second IF signal of 455kHz.
The second IF signal is passed
through the ceramic filter (CF200; Wide,
CF201; Narrow) to more remove the
adjacent channel signal. The filtered
second IF signal is amplified by the
limiting amplifier and demodulated by
the quadrature detector with ceramic
discriminator (CD200). The demodulated
signal is routed to the audio circuit.
Narrow and Wide settings can be made for each channel
by switching the ceramic filters CF200 (Wide), CF201 (Narrow).
The WIDE (high level) and NARROW (low level) data is
output from IC311 (microcomputer) pin 14.
Regardless of NARROW or WIDE band selection, signals
always pass through the filter, CF200.
When the WIDE band is selected, Q201 is turned ON, then
D202 and D203 are turned OFF.
So, the signal does not pass through the filter CF201. When
the NARROW band is selected, Q201 is turned OFF, then D202
and D203 are turned ON. So, the signal passes through the
filters, CF200 and CF201.
Q202 turns on/off with the Wide/Narrow data and the IC200
detector output level is changed to maintain a constant output
level during wide or narrow signals.
The demodulated signal from IC200 goes through the mute
switch (Q204) and is amplified by IC300 (2/2), high-pass filtered,
low-pass filtered, high-pass filtered, band-eliminate filtered,
and de-emphasized by IC500.
The signal then goes through an AF amplifier IC305 (2/2),
an electronic volume control (IC307), and an AF switch (Q308
is on), and is routed to audio power amplifier (IC313), where it
is amplified and output to the internal speaker.
The audio mute signal (AM) from the shift register becomes
Low in the standby and Q302 and Q305 which are power
supply circuit for IC313 turn off. Also, IC500 is set to the power
down mode according to data from microprocessor, and the
AF signal is muted. When the audio is output, AM becomes
High to turn Q302 and Q305 ON, and voltage is supplied to
power terminal VP of IC313. Also, IC500 is canceled out of
the power down mode.
The speaker is switched by the logic of speaker switching
terminal SSW on the universal connector. When SP-MIC is
not attached, the logic of SSW becomes High and SW (Q308)
is turned ON, and the AF signal is input to both amplifiers of
IC313.
When SP-MIC is attached, SSW is connected to GND at
inside of SP-MIC. For this reason, Q308 is turned OFF, and
the AF signal is input only to amplifier for EXT SP of IC313.
The output from IC200 enters FM IF IC again, then passed
through a band-pass filter. And passed through a band-pass
filter IC202 (2/2). The modulation input. The noise component
output from IC202 (2/2) is amplified by Q208 and rectified by
D201 to produce a DC voltage corresponding to the noise level.
The DC voltage is sent to the analog port of the CPU (IC309).
And IC200 outputs a DC voltage (RSSI) corresponding to the
input of the IF amplifier. The CPU reads the RSSI signal via pin
93.
IC309 determines whether to output sounds from the
speaker by comparing the input voltage of pin 91 and pin 93
with the preset value.
Fig. 6Squelch and RSSI voltoge vs ANT input level /
图6 静噪和 RSSI 电压与 ANT 输入电平
4. Transmitter System
4-1. Microphone amplifier
The signal from the internal microphone goes through the
mute switch (Q301).
When the SP-MIC is not attached, the microphone
switching terminal (MSW) on the universal connector becomes
High, and mute switch (Q301) is turned ON. When the SPMIC is attached, MSW is connected to GND at inside of SPMIC. For this reason, Q301 is turned OFF, the internal
microphone is muted, and only the input of the external
microphone is supplied to the microphone amplifier of the TXRX unit.
The signal from microphone passes through the limited
circuit in D508 and amplified by IC501 (1/2), Microphone mute
switch (Q502 is off in TX) and through the high-pass filter, the
ALC circuit, the low-pass filter, the high-pass filter, and preemphasis/ IDC circuit in IC500 on the small board. When
encoding DTMF, mute switch (Q500) is turned OFF for muting
the microphone input signal.
The signal passes through the D/A converter (IC307) for
the maximum deviation adjustment, and enters the summing
amplifier consisting of IC305 (1/2), and is mixed with the low
speed data from the CPU (IC309).
The output signal from the summing amplifier passes
through the D/A converter (IC307) again and goes to the VCO
modulation input.
The other output signal from the summing amplifier passes
through the D/A converter (IC307) again for the BAL
adjustment, and the buffer amplifier (IC302 (2/2)), and goes to
the TCXO modulation input.
EXT.
MIC
Q301D501
MIC
SW
MIC
Q305
MIC
MUTE
PTTMSW
Q502
LIMIT
IC501 (1/2)
LPF
12
Fig. 7Microphone amplifier / 图7话筒放大器
4-2. Drive and Final amplifier
The signal from the T/R switch (D101 is on) is amplified by
the pre-drive (Q100 and Q101) and drive amplifier (Q103) to
50mW.
The output of the drive amplifier is amplified by the RF
power amplifier (Q106) to 4.0W (1W when the power is low).
The RF power amplifier is MOS FET transistor.
The output of the RF power amplifier is then passed through
the harmonic filter (LPF) and antenna switch (D102, D103 is
on) and applied to the antenna terminal.
Q100,Q101Q103Q106
From
T/R SW
(D101)
+B
Pre-DRIVE
AMP
R119
DRIVE
AMP
来自于加法放大器的输出信号再次通过数/模转换器(IC307)
并进入 VCO 调制输入。
来自于总和放大器的其他输出信号再次通过数 / 模转换器
(IC307)进行 BAL 调整,并通过缓冲放大器(IC302 2/2),然后
进入 TCXO 调制输入。
IC500
HPF
I5
IC307
D/A
O5
15
ALC
IC305 (1/2)
LSD DI9
SUM
AMP
16
MUTE
Q13
1819
COMP
DTMF
SW
IC307
I2
IC307IC303(1/2)
I1
98
LPFHPFIDC
D/A
D/A
VCO
O2
BUFF
AMP
O1
PRE
EMP
6
TCXO
4-2.驱动和末级放大器
来自于 T/R 开关(D101 接通)的信号被前置驱动(Q100 和
Q101)和驱动放大器(Q103)放大到 50mW。
驱动放大器的输出被射频功率放大器(Q106)放大到4.0W(当
低功率时为1W)。射频功率放大器是 MOS FET 晶体管。 然后射
频功率放大器的输出通过谐波滤波器(LPF)和天线开关(D102,
D103 接通)提供给天线端点。
ANT
D102,D103
RF
POWER AMP
VDD
VGG
ANT
SW
LPF
R120
R123
IC100
REF
(1/2)
VOL
(IC307)
Fig. 8Drive and final amplifier and APC circuit /
图8 驱动和末级放大器和自动功率控制电路
4-3. APC circuit
The APC circuit always monitors the current flowing through
the drive amplifier (Q103) and the RF power amplifier (Q106)
and keeps a constant current.
The voltage drop at R119, R120 and R123 are caused by
the current flowing through the RF power amplifier and this
voltage is applied to the differential amplifier (IC100 1/2).
IC100 (2/2) compares the output voltage of IC100 (1/2) with
the reference voltage from IC307, and the output of IC100 (2/
2) controls the VGG of the RF power amplifier to make the
both voltages to same voltage.
The change of power high/low is carried out by the change
of the reference voltage. Q105, Q107 and Q108 are turned on
in transmit and the APC circuit is active.
The frequency synthesizer consists of the TCXO (X1), VCO,
PLL IC (IC1) and buffer amplifiers.
The TCXO generates 16.8MHz. The frequency stability is
2.5ppm within the temperature range of –30 to +60˚C. The
frequency tuning and modulation of the TCXO are done to
apply a voltage to pin 1 of the TCXO. The output of the TCXO
is applied to pin 8 of the PLL IC.
The TK-3148’s VCO consists of 2VCO and covers a dual range
of the 305.15~445.15MHz and the 350~390MHz. The VCO
generates 405.15~425.15MHz for providing to the first local
signal in receive. The operating frequency is generated by Q3 in
transmit mode and Q2 in receive mode.
The oscillator frequency is controlled by applying the VCO
control voltage, obtained from the phase comparator (IC1) to
the variable capacitor diodes (D1, D3, D7, and D8 in transmit
mode and D2, D4, D9 and D10 in receive mode).
The T/R pin of IC312 goes “high” in receive mode causing
Q4, Q6 and Q3 to turn off, and Q2 turn on. The T/R pin goes
“low” in transmit mode.
The outputs from Q2 and Q3 are amplified by buffer amplifier
(Q5) come to the amplifiers.
The PLL IC consists of a prescaler, fractional divider,
reference divider, phase comparator, charge pump. This PLL
IC is fractional-N type synthesizer and performs in the 40,50
or 60kHz reference signal which is eighth of the channel step
(6.25kHz). The input signal from the pins 5 and 8 of the PLL IC
is divided down to the 50kHz and compared at phase
comparator. The pulsed output signal of the phase comparator
is applied to the charge pump and transformed into DC signal
in the loop filter (LPF). The DC signal is applied to the pin 1 of
the VCO and locked to keep the VCO frequency constant.
PLL data is output from DP (pin 73). CP (pin 74) and EP (pin
72) of the microprocessor (IC309). The data are input to the
PLL IC when the channel is changed or when transmission is
changed to reception and vice versa.
5.频率合成器单元
5-1.频率合成器
频率合成器由 TCXO(X1),VCO,PLL IC(IC1)和缓冲放
大器组成。
TCXO产生16.8MHz的频率。在-30到+60℃的温度范围内,
频率稳定性为2.5ppm。TCXO的频率调谐和调制是通过给TCXO
的管脚 1 提供电压来实现的。TCXO 的输出提供给 PLL IC 的管
脚8。
The control circuit consists of microprocessor (IC309) and
its peripheral circuits. It controls the TX-RX unit and transfers
data to and from the display unit. IC309 mainly performs the
following;
1) Switching between transmission and reception by PTT
signal input.
2) Reading system, group, frequency, and program data
from the memory circuit.
3) Sending frequency program data to the PLL.
4) Controlling squelch on/off by the DC voltage from the
squelch circuit.
5) Controlling the audio mute circuit by decode data input.
6) Transmitting tone and encode data.
6-1. Memory circuit
Memory circuit consists of the CPU (IC309) and a flash
memory (IC308), a flash memory has a capacity of 4M bits
that contains the transceiver control program for the CPU and
data such as transceiver channels and operating features.
This program can be easily written from an external devices.
Data. such as operating status, are programmed into the
EEPROM (IC310).
●
Flash Memory
Note : The flash memory stores the data containing the FPU
(KPG-74D CPS) program, Security Number (MPT Serial
Number) and firmware program (User mode, Test mode,
Tuning mode, etc.).
This data must be reinstalled when replacing the flash memory.
记忆电路由 CPU (IC309) 和一块闪存(IC308)组成。闪存容
量4MB,载有 CPU 所需的收发机控制程序以及收发机信道、功
能设置等数据。
可以方便地使用外部设备写这个程序。工作状态等数据编写
在 EEPROM (IC310)中。
●
闪存
注释∶闪存保存的数据包括 FPU(KPG-74D CPS)程序,安全码
(MPT序列号)和固件编程(用户模式,测试模式,调谐模式等)。
当更换闪存时,必须重新安装数据。
●
EEPROM
Note : The EEPROM stores tuning data (Deviation, Squelch,
etc.). Realign the transceiver after replacing the EEPROM.
IC309
CPU
FLASH
IC308
Fig. 10Memory circuit / 图10 存储器电路
6-2. Low battery warning
The battery voltage is monitored by the microprocessor
(IC309). When the battery voltage falls below the voltage set
by the Low Battery Warning adjustment, the red LED flashes
to notify the operator that it is time to replace the battery. If
the battery voltage falls even more (approx. 6.1V), a beep
sounds and transmission is stopped.
Low battery warning
The red LED flashes during
transmission
The red LED flashes and
continuous beep sounds
while PTT pressed
Battery condition
The battery voltage is low but
the transceiver is still usable.
The battery voltage is low and
the transceiver is not usable
to make calls.
当按下 PTT 键时红色指示灯闪 电池电压降低不能使用手持
烁并且手持机发出连续 beep 音。 机发出呼叫。
电池电压降低但仍可使用手
持机。
16
CIRCUIT DESCRIPTION / 电路说明
TK-3148
7. Signalling Circuit
7-1. Encode
●
Low-speed data (QT,DQT)
Low-speed data is output from pin 1 of the CPU. The signal
passes through a low-pass CR filter, and goes to the summing
amplifier (IC305 1/2). The signal is mixed with the audio signal
and goes to the VCO and TCXO (X1) modulation input after
passing through the D/A converter (IC307) for BAL adjustment.
●
High-speed data (DTMF)
High-speed data is output from pin 2 of the CPU. The signal
passes through a low-pass filter consisting of IC304, and
provides a TX DTMF tone and a RX DTMF tone TX DTMF
deviation making an adjustment by microprocessor is passed
through the D/A convertor (IC307), and then applied to the
audio processor (IC500).
The signal is mixed with the audio signal and goes to the
VCO and TCXO, the RX DTMF tone is passed a summing
amplifier (IC305 2/2), the D/A converter (IC307) for audio
control, audio power amplifier and then to the speaker.
●
FFSK
ESN utilizes 1200bps FFSK signal. FFSK signal is output
from pin 6 of IC500. The signal passes through the D/A
converter (IC307) for the FFSK deviation adjustment. and is
routed to the VCO. When encoding FFSK, the microphone
input signal is muted.
7.信令电路
7-1.编码
●
低速率数据(QT,DQT)
CPU 的管脚 1输出低速率数据。信号通过低通陶瓷滤波器进
入总和放大器(IC305 1/2)。此信号与音频信号混合,通过数 /
模转换器(IC307)进行BAL调整后进入 VCO 和TCXO(X1)调
制输入。
The demodulated signal from the IF IC (IC200) is amplified
by IC300 (2/2) and passes through a low-pass filter (IC306) to
remove audio components. The signal is input to pin 95 of the
CPU.
The CPU digitizes this signal, performs processing such as
DC restoration, and decodes the signal.
RX Audio
SUM
IC305 (2/2)
SUM
I6
I3
O5
I2
D/A (ADJ)
IC307
O6
O3
O2
O1
AF
AMP
IC500
SUM
I5
MIC IN
MD
VCO
IC302
BUFF
AMP
MB
X1
TCXO
7-2.解码
●
低速率数据(QT,DQT)
来自于中频芯片(IC200)的已解调的信号被IC300(2/2)放
大,然后通过低通滤波器(IC306)消除音频成分。此信号被输
入到 CPU 的管脚 95。
CPU使信号数字化,执行诸如直流恢复和解码信号这样的步
骤。
17
TK-3148
CIRCUIT DESCRIPTION / 电路说明
●
FFSK
The FFSK input signal from the IF IC is amplified by IC300
(1/ 2) and goes to pin 5 of IC500. The signal is demodulated by
FFSK demodulator in IC500. The demodulated data goes to
the CPU for processing.
IC500
AF IC
IC300
AMP
IC500
XOUT
IC306
LPF
IC301
DTMF
DECODE
OSC1
PD
Fig. 12Decode / 图12 解码
8. Power Supply Circuit
Battery +B is supplied via a 3A fuse from the battery terminal
connected to the TX-RX unit. After passing through the power
switch, power supply (SB) is applied to the three AVRs. IC5
supplies 5V (5M) to the control circuit, and IC9 supplies 5V
(5C) to common circuits. IC6 supplies to the TX circuit, the RX
circuit and common circuits of needless save mode. During
transmission, 5TC becomes Low and Q405 is turned ON to
supply 5V (5T) to the TX circuit. During reception, 5RC becomes
Low and Q404 is turned ON to supply 5V (5R) to the RX Circuit.
The power supply voltage monitor IC (IC404) monitors
power supply voltage (SB). If the voltage falls (less than 5V),
the VOUT port goes “LOW” level, the CPU INT port also goes
“LOW” level, and the CPU stops.
●
FFSK
来自于中频芯片的FFSK 输入信号被 IC300(1/2)放大,然后
进入IC500 的管脚 5。此信号被IC500中的FFSK 解调器解调。已
解调的数据进入 CPU 执行操作。