Kirisun PT4200 Service Manual
PROFESSIONAL
TWO-WAY RADIO
PT4200
FM PORTABLE RADIO
SERVICE MANUAL
V060802
PT4200 SERVICE MANUAL
DANGEROUS!
Do not connect the AC power or DC power over 8.6V
with any connector or terminals of the radio. Otherwise it will
cause fire or electric shock or damage to the radio.
WARNING!
Do not reverse power connection.
It may cause harm to the radio if signal input on the
antenna connector is bigger than 20 dBm (100mW).
Do not turn on the power before the antenna or load
connection is completed.
If the antenna has been damaged, do not use the radio.
Damaged antenna may cause lightly burning on skin.
Though the radio is waterproof, it's better avoid putting it
in rain or snow, or any other liquid to ensure its life and
performance.
CONTENTS
Chapter 1 Introduction...................................................1
Chapter 2 Radio Overview and Function Keys .................1
Chapter 3 Electrocircuit ..................................................2
Chapter 4 Function Description and Parameter Setting......7
Chapter 5 Service Assemble and Disassemble.................9
Chapter 6 Radio Debugging..........................................11
Chapter 7 Major Specifications......................................13
Chapter 8 Trouble Shooting...........................................13
Chapter 9 KBC-58L Charger.........................................14
Appendix 1 Abbreviations..............................................14
Appendix 2 Spare List..................................................15
STATEMENT
Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of KSP20 software. KSP20 software is free for
duplication.
Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of the MCU software.
Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of the radio outward/structure/circuit design.
Kirisun Electronic (Shenzhen) Co., Ltd owns the
copyright of this service manual. Publication without
authorization is prohibited.
Kirisun Electronic (Shenzhen) Co., Ltd owns the
trademarks KIRISUN
Appendix 3 Framework Component List ........................15
Appendix 4 Electrical Component List............................16
Appendix 5 Accessory List............................................21
Figure 1 PT4200 Top Board Position Mark Diagram.........22
Figure 2 PT4200 Bottom Board Position Mark Diagram....23
Figur3 PT4200 Schematic Circuit Pane Diagram............24
Figur4 PT4200 Schematic Circuit Pane Diagram............25
Figure 5 KBC-58L Schematic Circuit Diagram................26
PT4200 SERVICE MANUAL
Chapter 1 Introduction
1.1 Introduction
This manual applies to the service and maintenance of PT4200
series of FM mobile radios, and is designed for the engineers and
professional technicians that have been trained by Kirisun. In this
manual you can find all the information of product service. Kirisun
reserves the rights to modify the product structure and specification
without notice in order to enhance product performance and quality.
You can also log on our website www.kirisun.com to download the
latest service manual or contact your local dealer or us.
Read this manual before repairing the product.
1.2 Service Precautions
Safety
Avoid skin contacting with the antenna connector and PCB.
Do not reverse the power polarities.
Do not turn on the power before the antenna and load
connection is completed.
Do not use the radio if the antenna has been damaged.
Contacting the damaged antenna will cause lightly burning on the
skin.
Repairing service can only conducted by professional
technicians.
reconstructing the radio by the users without permission.
Wearing and tearing or any man-made sabotage such
as mechanical damage, burning or water leaking.
Product serial number has been damaged or the product
trademark is difficult to identify.
After the warranty expires, lifetime service is still
available. And we also provide service components to
service stations.
Chapter 2 Radio Overview and Function Keys
2.1 Radio Overview
Electromagnetism Interference
It's prohibited to use or repair the radio in the following
places:
Hospital, health center, air port
Any area with a potentially explosive atmosphere (where the air
contains gas, dust and smog, etc.), such as the storage or
transportation facilities.
Any area of dynamite or exploder.
Component Replacement
All the components used in repair service should be supplied by
Kirisun.
Other components of the same models available on the market
are not surely able to use in this product and we do not guarantee
the quality of the product using such components.
Please fill in a component application forms if you want to apply
for any components from Kirisun.
The following is one sample form that might be used to apply
for any components from Kirisun.
Component Application
Model Component No . Model/
PT4200-2 FET Q11 RD07MVS1 105-RD07MV-001 1
PT4200-2 Triode Q5 2SC5108 Y 104-SC5108-001 1
PT4200-2 Belt Clip KBJ-05 1
1.3 Service
All the Kirisun products are subject to the service warranty.
The main unit of the radio is guaranteed for service of 18 months. In
one of the following situations, charge free service will not available.
No valid service warranty or original invoice.
Malfunction caused by disassembling, repairing or
Specifications
Material
Serial
Quantity
No .
LED Indicator
Lights red while transmitting; lights green while receiving a
signal.
Flashes red while in low battery power.
Channel Selector
Rotate to select channel 1-16.
Power/Volume Switch
Turn clockwise to switch on the radio.
Turn counterclockwise till a click is heard to switch off the radio.
Rotate it to adjust the volume after turning on the radio.
PTT (Push-to-talk)
To make a call, press and hold the PTT button, then speak into
the microphone in normal voice.
Release the PTT button to receive a call.
Monitor Button
Press to disable the SQUELCH, and release to enable the
SQUELCH again.
Channel Annunciation Button
Press it in standby state, and the channel number will be
annunciated. If press and hold this button, and at the same time
switch on the radio again, the type of voice annunciation of channel
number will be changed.
Emergency Button
Press and hold this button for over 2 seconds to activate
warning tone. Press it again to exit the emergency alert state.
Note: When warning tone sounds, all of the buttons are
disabled.
Microphone/Speaker Jacks
For connecting external Microphone/Speaker.
1
PT4200 SERVICE MANUAL
Chapter 3 Electrocircuit
3.1 Frequency Configuration
Figure3.1 Frequency Configuration
This radio adopts the 2nd Mixer, the 1st IF 49.95MHz, the 2nd
IF 450kHz.
The receiver's first local oscillation is generated by the
frequency synthesizer. The second local oscillation is generated by
the crystal oscillator.
The transmitter signals are generated by frequency synthesizer.
The reference frequency of frequency synthesizer is generated
by TCXO.
3.3 Receiver (RX)
IC5 inner circuit and X3 (49.5MHz) compose the 2nd local
oscillator. The 2nd local oscillation (49.5MHz) and the 1st IF signal
(49.95MHz) are mixed at IC5 to generate the 2nd IF 450MHz .
After the 2nd IF signal is amplified and its amplitude is limited at
IC5, and then filtered at porcelain filter (CF1,450kHz), IC5
demodulates and sends out audio signals.
Figure 3.3IF System
Receiver Audio Signal Processing
IC6 and its peripheral circuit compose the receiver audio signal
processing circuit. IC5 sends audio signals to IC6-C for
amplification, and then to IC4 (CTCSS signaling filtering circuit) and
IC6-D. After the signals are amplified, de-emphasized, filtered at
IC6 and other cells, the HF (high frequency) and LF (low frequency)
will be eliminated, and the remaining 300-3000Hz audio is sent to
Q9 for amplification and then to volume potentiometer for
adjustment and finally sent to the audio amplifier (Ic8).
Figure 3.2 Receiver Illustration
The Receiver Front Terminal
Signals from the antenna pass through the RX/TX switch (D1,
D2, D4, D5); and then undesirable out-of-band signals will be
filtered out at the band pass filter (BPF) consisting of C227, L8, L15,
C70, C126, C218, L9, C217, L10, C127; then signals are amplified
at the low noise amplifier (LNA) consisting of Q20 and its peripheral
components.
The output from the LNA passes the BPF consisting of L5, L6,
L7, C228, C124, and C132 for filtering and then is sent to the first
grade frequency mixer (Q19).
MCU produces output voltages and alters the capacitance of
the variable capacitor diodes D21, D22, D23, D24, D26, D30 to
control the center frequency of the band-pass filter.
The First Frequency Mixer
After mixing the receiving signals and the first local oscillation
signals from the frequency synthesizer, the 1st IF signals
49.95MHz are generated. The first IF signals pass the crystal
filter (XF1, XF2) , which will filter the signals of adjacent channel
and those out of band.
IF Circuit
The 1st IF signals from the crystal filter are amplified at the first
IF amplifier (Q21), and then are sent to the IF processing IC (IC5,
MC3361). The IF IC consists of the 2nd frequency mixer, the 2nd
local oscillator, IF amplifier, limiter, phase frequency detector, and
noise amplifier.
Figure 3.4 Receiver Audio Processing
Squelch Circuit
Demodulation output from IC5 is sent to the selection frequency
noise amplifier, which consists of IC5 inner noise amplifier and
C107, R124, R152, C33, and C35, to be filtered off the noise. After
being amplified at Q7, noise is sent to D17 and D18 for wave
checking and then sent to MCU, which determines the noise
volume to control the squelch.
Audio Amplifier
IC8 and peripheral components construct the audio amplifier.
Receiving audio signals, voice indication signals, indication tone
signals and warning tone signals are collected for audio
amplification to drive the speaker. Warning tone has no volume
control.
When AFCO is at the high level, Q37, Q8, Q33, and Q38 will be
connected, and IC8 starts working and voice comes out from the
speaker.
Q36: Receiving audio signal switch
Q35: Warning tone switch
Q25: Indication tone switch
2
PT4200 SERVICE MANUAL
CTCSS Signal Filtering
The IC5 demodulated output audio signals may contain CTCSS
(continuous tone coded squelch system) and DCS (digital coded
squelch). The frequency spectrum of CTCSS/DCS is 2-250Hz. The
filtering circuit constructed by IC4 can filter out the signals out of the
CTCSS/DCS frequency spectrum to ensure MCU to decode
CTCSS/DCS more precisely.
3.2 Transmitter (TX)
Transmitter Amplifier
Figure 3.5 Amplifier and Antenna Switch Diagram
The modulated signals from VCO are amplified at Q2, Q3, and
Q12 and then are sent to Q11 for amplification. Q11 output power:
4.5W.
The Q11 and Q12 gate offset is controlled by APC circuit.
Changing gate-offset voltage can control the transmitter output
power conveniently.
APC (Auto Power Control)
Figure 3.6 APC Circuit
R167, R168, and R169 are the amplifier current checker; IC3A
is the sample amplifier of the amplification current; IC3B is the
power comparison amplifier.
If the transmitter output power is too big, the amplifier current
will increase, IC3A output will mount, IC3B output voltage decrease,
the offset voltage added to Q11 and Q12 will decrease, and then
the transmitter output power will decrease. Vice versa, such can
ensure steady transmitter output power in different working
circumstances.
MCU changes the input power to IC3B to set the power.
Transmitter Audio Signal Processing
amplified, the amplitude of them is limited, and are filtered, they are
sent to VCO together with CTCSS/DCS for modulation.
D13, D308, and Q24 constitute AGC circuit which decreases
signal amplitude to avoid signal distortion when MIC signal is too
big.
Q34 is the power switch of audio processing circuit. It supplies
power to IC7 only when in transmitting and it is controlled by MCU.
J2 is the external MIC socket. When external MIC is used, the
inner MIC will cut off automatically, but PTT will remain activated.
3.3 Frequency Synthesizer
Figure 3.8 Frequency Synthesizer
The radio adopts PLL (Phase Locked Loop) frequency
synthesizer.
The frequency synthesizer consists of standard oscillator,
voltage controlled oscillator (VCO), programmable frequency
demultiplier, phase comparator, and low pass filter.
Q14, L30, C120, C88, C142, C180, D8, and D9 constitute RX
VCO. D12 is the modulation circuit of VCO.
ICI (MB15E03) is PLL integrated circuit, including
programmable reference frequency demultiplier, programmable
swallowing frequency demultiplier, phase comparator, and charge
pump.
R244, c193, R202, R40, C207, R141, C205, R2, and C204
construct the low pass filter.
The standard frequency is supplied by X4 (TCXO, 13MHz).
The standard frequency fromTCXO (Temperature Control
Transistor Oscillator) are demultiplied by the programmable
reference frequency demultiplier at IC1 to acquire 5kHz or 6.25kHz
reference frequency (controlled by MCU according to the preset
channel frequency).
The oscillation frequency from VCO is sent to IC1, and
demultiplied by swallowing frequency demultiplier and compared
with reference frequency to acquire the error signals. Then pass the
low pass filter and are sent to VCO to change VCO oscillation
frequency to the preset value, and then VCO is locked.
N=FVCO/FR
N Frequency demultiplication times
FVCO VCO oscillation frequency
FR Reference frequency
Figure 3.7 Transmitter Audio Circuit
IC7 and the peripherals components construct the transmitter
audio processing circuit. After the audio signals from MIC are
3
Check Loss of Lock: When PLL is in loss of lock, IC pin14
sends out low level signals to MCU, which controls the transmitter
not to transmit and initiate warning tome.
Q6: Power filter to supply more pure power to reduce the noise
of the frequency synthesizer.
3.4 Voice Indication Circuit
The radio features voice indication, which is very useful at night
or in the environment of dim light.
IC15 is a voice memory chip which stores the voice indication of
channels, and every time you change the channel, the speaker will
sound voice annunciation of the current channel number. Press
voice annunciation key will repeat the voice annunciation of the
current channel number.
If the voice annunciation function has been set, press voice
annunciation key in the stand by mode and the speaker will
sound voice annunciation of the current channel number. If turn on
the radio again with the voice annunciation key pressed, the
voice type will be changed. Repeat turning on the radio with the
voice annunciation key pressed, the voice type will change in the
sequence Chinese Male--- English Male--- Chinese Female --English Female ---- No Indication .
3.5 Power Supply
The radio is equipped with 7.4V, 1200mAh Li-Ion battery. The
battery supplies power directly to the transmitter amplifier circuit
(Q11, Q12) and the receiver amplifier (IC8). The power supply of
other circuits is the regulated 5V power.
IC12: 5V low voltage difference, micropower regulator, together
with Q10, and Q30 supply big current 5V power to the whole radio.
Q29: 5T switch, controlled by MCU.
5T: Supplies power for the front terminal of the transmitter.
Q31: 5R switch, controlled by MCU.
5R: Supplies power for the receiver RF amplification, mixing, IF
processing, audio signal processing.
Q32: 5C switch, controlled by MCU
5C: The 5V power controlled by power saving supplies power
for the frequency synthesizer.
3.6 MCU
PT4200 SERVICE MANUAL
Memorizer E2PROM AT24C08
Memorizes the radio channel data, CTCSS/DCS data, and
other data of function setting and parameter adjustment.
CTCSS/DCS Encoding and Decoding
CTCSS/DCS signals generated by MCU (output form pin5) are
filtered at R155, R156, C242, and C243, and then sent to VCO and
TCXO for modulation.
CTCSS/DCS signals from the receiver are sent to MCU(pin1)
for demodulation. MCU determines whether the signals contain the
same CTCSS/DCS as that set on the radio and decides whether to
turn on the speaker.
Power Adjustment
MCU P56 output is sent to APC part to control the transmitter
output power.
CTCSS
CTCSS (continuous tone control squelch system) is a squelch
control system modulated on carrier wave with continuous subaudio
frequency as pilot frequency. If a channel is set with CTCSS, only
when both the CTCSS of the receiver and that of the transmitter are
identical, communication is available, which avoids interference of
other signals.
39 groups of standard CTCSS frequency is available on the
radio, see Table 3.1.
CTCSS signals generated by MCU pass the low pass filter
consisting of RC to be filtered off the high frequency over 300Hz
and then are sent to VCO for modulation.
Figure 3.9 MCU Diagram
MCU controls the working of each unit of the radio to realize all
the radio functions.
Connects with the PC
Accesses the radio status data
Controls PLL to generate the receiving and transmitting local
oscillation frequency.
Accesses the current channel status.
Controls the LED status indication
Controls the power supply of each location
Checks the action of each function key
Generates CTCSS signals
Generates DCS signals
DCS decoding
Squelch check and control
Controls the content of voice indication
Table 3.1 CTCSS Frequency Table
.
No
FREQUENCY
(Hz)
1 67.0 131.8
2 69.3 136.5
3 71.9 23 141.3
4 74.4 24 146.2
5 77.0 25 151.4
6 79.7 26 156.7
7 82.5 27 162.2
8 85.4 28 167.9
9 88.5 29 173.8
10 91.5 30 179.9
11
12
13
14
15
16
17
18
19
20
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
No
.
21
22
31
32
33
34
35
36
37
38
39
FREQUENCY
(Hz)
186.2
192.8
203.5
210.7
218.1
225.7
233.6
241.8
250.3
4
PT4200 SERVICE MANUAL
DCS
DCS (digital code squelch) is a kind of continuous digital code
modulated with voice signals on carrier wave to control squelch.
83 groups of standard codes (positive and inverse code) are
available. See table 3.2.
DCS signals generated by MCU (PWM wave shape) pass the
low pass filter to be filtered off the high frequency over 300Hz and
then are sent to VCO and TCXO for modulation. VCO modulates
the high frequency of DCS signals; TCXO modulates the low
frequency of DCS signals.
CTCSS/DCS signals from the receiver are sent to MCU for
modulation. MCU determines whether the DCS encoding of the
receiving signals is identical with that set on the radio and decides
whether to turn on the speaker.
Table 3.2 DCS Encoding List
023 114 174 315 445 631
025 115 205 331 464 632
026 116 223 343 465 654
031 125 226 346 466 662
032 131 243 351 503 664
043 132 244 364 506 703
047 134 245 365 516 712
051 143 251 371 532 723
054 152 261 411 546 731
065 155 263 412 565 732
071 156 265 413 606 734
072 162 271 423 612 743
073 165 306 431 624 754
074 172 311 432 627
3.7 Semiconductor Component
MCU Description
Table 3.3 Microprocessor (M38034) Port Description
Port
No
.
1 TI P1 I
2 BUSY P2 I Busy s ignal in put
3 BATT P3 I Ba ttery vo ltage check
4 ALARM P4 I Alarm key check
5 TO P5 O QT/DQT output
6 BEEP P6 O Beep output/warning tone output
7
8
9
10
11
12
13
14
15
16
17 SELF P17 I Self programming
L: Model setting mode
18 CNVSS P18 I Connect 10K resistor with VSS
19 RST P19 I R e set i nput
20 INT0 P20 I P o w er ch eck in put
Name
PF1
ENC0
ENC2
ENC3
ENC1
NC
PTT
TXD
RXD
MONI
Pin
Name
I/O
QT/DQT signal input
P7 I Voice indication key check
P8 I Encoding input
P9 I Encoding input
P10 I Encoding input
P11 I Encoding input
P12 I Not used
P13 I [PTT] key input, connected with RXD
P14 O RS-232C input
P15 I RS-232C input
P16 I [MONI] key input
FunctionPin
5
21 ENC P21 I
-SEL
Connect the pull down resistor with
VSS .
22 XIN P22 I 7.3MHz Osc illator
23 XOUT P23 O
24 VSS P24 I
25 SHIFT P25 O
26 PABC P26 O
27 OSCSI P27 I
28 WNTC P28 O Wide/Narrow band contro l
H Wide L Narrow
29 PS P29 O PLL p ower s aving co ntrol H No rmal
working L Power saving
30 SDA P30 I/O EE PROM data wire
31 SCL P31 O EE PROM cloc k wire
32 UL P32 I PLL unlock che c k pin H Locked
33 DT P33 O PL L data output
34 CK P34 O PL L clock output
35 LE P35 O PLL IC en abl i n g pin H L atched
36 5MC P36 O Power control excep t CPU and
EEPROM L Open
37 AFCO P37 O
38 RX P38 O TX/RX VCO Se l e c tion H Rece iving
39 GLED P39 O Gree n indicato r contro l H Ligh t
40 RLED P40 O Re d indicato r contro l H Light
41 SAVE P41 O Battery power saving c o ntrol
H Power supply L Power saving
42 MUTE P42 O Squelc h contro l
H L Audio squelch
43 5RC P43 O
44 5TC P44 O
45 W588C P45 O
46 AC P46 O
47 DAOUT1 P47 O
48 DAOUT0 P48 O
49 DAOUT7 P49 O
50 DAOUT6 P50 O D/A output6
51 DAOUT5 P51 O D/A output5
52 DAOUT4 P52 O D/A output4
53 DAOUT3 P53 O D/A output3
54 DAOUT2 P54 O D/A output2
55 NC P55 O Not used
56 APC P 5 6 O
RX BPF tuning output
57 VCC P57 I CPU pow er 5V input
58 VREF P58 I Connected with VCC
59 AVSS I Conn ecte d with VSS
60 IF_SEL
resistor with VSS H 49.95 L 21.4
P59
P60
Encoding switch selection.
Earthing
Clock frequency shift H Open
Final power supply H Open
VCO crystal selection.
Connect the pull down resistor with
VSS H 13 L 16.8
L Loss of lock
Audio amplification power H:Open
Mic squelch
eceiving power control L Open
R
Transmitter power control H Open
Voice indication H Voice
annunciation of channel
Alert control H Control by voice
volume.
It must be in low battery
when in emergency alert state
D/A output 1
D/A output 0
D/A output 7 frequency regulated
output VCCN
TX Auto power contro l outpu t
I
IF selection. Connect the pull down
level
.
PT4200 SERVICE MANUAL
61 BUSY_V P61 I Voice indication of circuit busy check
62 DATA_V P62 I/O Voice indication data
63 SCLK_V P63 I/O Voice indication clock
64 NC Not used
3.4 Semiconductor Function Description
Posi
Type Function Description
IC1 MB15E03 Frequenc y synthesizer
IC4 NJM2904 APC Voltag e comparison , driv e
IC5 MC3361 Receiver' s 2n d loca l oscillation , 2n d I F
IC6 NJM2902 Receive r demodulatio n signa l
IC7 NJM2902
IC8 KIA6278F
IC9 AT24C08
function setting parameter,
IC10 M38034
IC11 PST9140NR
IC12 HT7150-1 Lo w voltag e differenc e, lo w powe r
IC15 W588A080 Voic e storag e I C
Q2 2SC5108 Transmitt er 1 st amplification
Q3 2SC3356 Transmitt er 2n d amplificatio n
Q4 2SC5108 VC O bufferin g amplifi er
Q5 2SC5108 VC O bufferin g amplifi er
Q6 2SC4617 VC O pow er filter
Q7 2SC4738 Nois e amplifier
Q9 2SC4617 Receiv er aud io signa ls amplification
Q10 2SC1623 5 V regulate d outp ut curre nt stretch er
Q11 RD07MVS1 Transmitter fina l pow er amp lifier
Q12 RD01MUS1 Transmitter pow er amp lifier driv e
Q17 DTA144EE AP C outp ut switc h
Q19 3SK318 Th e 1 st frequenc y mix er
Q20 3SK318 Receiv er H F amplifi er
Q21 KTC4082 Th e 1 st IF amplifier
Q22 DTC144EE Re d LE D driv e
Q23 DTC144EE Gree n LE D drive
Q24 2SK1824 Voic e indicatio n switch
Q26 DTC144EE 5 C switc h
Q29 KTA1298 5 T switc h
Q30 KTA1298 5 V regulate d outp ut curre nt stretch er
Q31 KTA1298 5 R switc h
Q32 KTA1298 5 C switc h
Q34 DTA144EE Pow er switc h of M IC amplificatio n un it
Q35 2SK1824 Aud io outp ut switc h of receiver.
Q36 2SK1824 Receive r aud io outp ut switc h
P64 I
amp lificati on, amplitude limit,
demodulation, noise amplification
am plification, filtering
MIC amplification , amplitud elimi
Receive raudi o amplifie
E2PROM , memor ychanne l frequenc ydata ,
Debugging state parameters
MCU
MCU rese tcircu it
consumption, and regulator
Cut off when in emergency alert state.
filterin
t,
g
r
Table 3.5 Diode Function Description
Posi
Type Function Description
tion
D1 MA77 Trans mitter an tenna s witch diode
D2 MA77 Trans mitter an tenna s witch diode
D3 HSC277 VCO output switch
D4 HSC277 Antenna switch
D5 HSC277 Antenna switch
D6 HSC277 VCO output switch
D7 HSC277 5V regulated output current stretcher
D8 HVC376B VCO oscillation variable capacitance diode
D9 HVC376B VCO oscillation variable capacitance diode
D12 MA360 VCO modulation diode
D14 HZU5ALL APC output voltage-limiting diode
D15 MA2S111 Loss of lock check diode
D16 MA2S111 VCO power filtering accelerating diode
D17 1N4148 Noise detector
D18 1N4148 Noise detector
D20 LED Green Receiving indication
D25 MA2S111 APC individual diode
D28 LED Red Transmitting indication
D29 LED Green Receiving Indication
Table3.6 XF1 XF2 Crystal Filter Features
Item Specified Value
Nominal center frequency 49.95MHz
Transmission bandwidth 7.5kHz or bigger within 3dB
40dB Barrage bandwidth 20.0kHz or smaller
Pulse 1.0dB or smaller
Insertion loss 3.0dB or smaller
Guarantee attenuation 80dB or bigger within fo-910kHz
Terminal resistance ---
Table 3.7 CF1 LTVPC450EB Features
Item Specified Value
Nominal center frequency 450kHz
6Db bandwidth 3.5kHz or bigger
50dB bandwidth 12.5kHz or smaller
Pulse 2.0dB or smaller within f0 4kHz
Insertion loss 6.0dB or smaller
Guarantee attenuation 35.0dB or bigger within f0 100kHz
Terminal resistance 2.0k
6
PT4200 SERVICE MANUAL
Figure 3.8 Semiconductor Component Packaging Illustration:
Chapter 4 Function Description and Parameter
Setting
4.1 Major Functions
4.1.1 16 Channels/15 Channels +Scanning Channel
The radio stores 16 channels including one scanning channel.
4.1.2 Scanning Function Control
If you switch the channel to channel 16, the radio is in the
scanning state. After starting scanning, it will pause when receiving
signals.
If you switch the channel to channel 1-15, the scanning function
is inactivated.
4.1.2.1 Carrier Wave Control Scanning
If the radio scanning setting is carrier wave control
scanning , switch the channel to channel 16 to set the radio in the
scanning working mode.
Each channel can be set the scanning added/deleted function
solely: if the setting is scanning added, the channel will be added in
the scanning list; if the setting is scanning deleted, the channel will
not be in the scanning list.
The radio starts scanning from channel 1 to 16 repeatedly in the
consequence of the scanning list. If signals are detected on a
channel ( if the channel is set with receiving signaling the carrier
wave must match the signaling), the radio pauses on that channel
and will restarts scanning 0.5~5 seconds (scanning delay time) after
the signals disappear.
If you switch the channel to channel 1~15, scanning is
inactivated.
4.1.2.2 Time Control Scanning
If the radio scanning setting is time control scanning , switch
the channel to channel 16 to set the radio in the scanning working
mode.
Each channel can be set canning added/deleted function solely:
if the setting is scanning added, the channel will be added in the
scanning list; if the setting is scanning deleted, the channel will not
be in the scanning list.
The radio starts scanning from channel 1 to 16 repeatedly in the
consequence of the scanning list. If signals are detected on a
channel (if the channel is set with receiving signaling the carrier
wave must match the signaling), the radio pauses on that channel
and will restarts scanning 0.5~5 seconds (scanning delay time) after
the signals disappear.
If you switch the channel to channel 1~15, scanning is
inactivated.
7
4.1.2.3 Priority Channel
You can set one channel in the scanning list as the priority
channel, which has the highest priority during scanning. The radio
scans the first non-priority channel in the canning list and then
scans the priority channel, the next non-priority channel in the
scanning list, and then the priority channel again. It goes on
scanning in such sequence.
4.1.2.4 Revert Channel
If you press PTT button when the radio is in scanning state, the
radio will transmit on the revert channel , which has 6 types:
Selected channel: The first channel in the scanning list.
Selected channel + current channel: If the radio is in the state of
scanning pause, it will transmit on the current communication
channel. Otherwise it will transmit on the first channel in the
scanning list.
Priority channel: The radio will always transmit on the priority
channel set in the scanning list when pressing PTT.
Priority channel + current channel: If the radio is in the state of
scanning pause, the radio will transmit on the current
communication channel. Otherwise it will transmit on the priority
channel in the scanning list.
Last called channel: The last channel that received signals.
Last called channel + current channel: If the radio is in the state
of scanning pause, the radio will transmit on the current
communication channel. Otherwise it will transmit on the last called
channel.
The current communication channel is the channel on which the
radio pauses in the 4 following situations:
1 When the radio receives signals and does not restart
scanning, the radio will stay on the current channel.
2 The radio will stay on the current channel during 0.5~5
seconds (scanning delay time) after signals disappear.
3 The radio will stay on the current channel when pressing
the PTT during scan.
4 After releasing the PTT to end transmitting, during the
preset transmitting dwell time, the radio will stay on the current
channel. After the preset transmitting dwell time 0.5~5 seconds, the
radio will restart scanning again.
4.1.2.5 Retrace Period
If the priority channel has been set in the scanning list and
retrace period is also set, when the radio receives signals on a nonpriority channel and pauses scanning, it will retrace the priority
channel in a certain period (0.3~5s). If signals are detected on the
priority channel, it will stay on the priority channel; if no signal is
detected on the priority channel, it returns to the original channel it
stays on.
4.1.3 CTCSS/DCS
CTCSS/DCS can realize selective calls and group calls. On the
same channel, only the two parties whose CTCSS/DCS are
identical can communicate. CTCSS/DCS signaling code on the
channel is preset.
4.1.4 TOT
The purpose of the time-out timer is to prevent any single
person from overlong using a channel to transmit and affecting the
whole group communication.
If the radio transmits longer than the preset TOT time limit, the
radio will stop transmitting and warning tone sounds. To stop the
warning tone, release the PTT button. Press the PTT again you can
resume transmitting.
4.1.5 Auto Power Saving
When no signals are being received or no operations are being
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