Kirisun DP480 User manual

DP480
V220927 Kirisun Communications Co.,Ltd.
Professional wireless communication system solution supplier
SERVICE MANUAL

DP480 Service Manual
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Contents
1. Overview ...................................................................................................................................................... 1
1.1. Range of Application.............................................................................................................................. 1
1.2. Safety Precaution .................................................................................................................................. 1
1.3. Maintenance Service............................................................................................................................. 1
2. External View and Keys.............................................................................................................................. 2
2.1. External View......................................................................................................................................... 2
2.2. Programmable Keys.............................................................................................................................. 3
2.3. LED Indicator......................................................................................................................................... 4
3. Basic Operation .......................................................................................................................................... 5
3.1. Powering On/Off....................................................................................................................................5
3.2. Selecting a Channel...............................................................................................................................5
3.3. Adjusting Volume...................................................................................................................................5
3.4. Initiating a Call.......................................................................................................................................5
3.5. Receiving a Call..................................................................................................................................... 5
3.6. Calling Back........................................................................................................................................... 5
4. Circuit Description...................................................................................................................................... 6
4.1. Circuit Diagram of Main Board .............................................................................................................. 6
4.2. RF Circuit Diagram................................................................................................................................ 7
4.3. Baseband Circuit Diagram.....................................................................................................................7
4.4. TX Circuit...............................................................................................................................................7
4.5. RX Circuit............................................................................................................................................... 8
4.6. Power Section........................................................................................................................................9
4.7. IC Description........................................................................................................................................9
4.7.1. Features of AT1846S......................................................................................................................9
4.7.2. Port Description of AT1846S ........................................................................................................ 10
4.7.3. Port Description of Master Chip HS8861.....................................................................................12
4.7.4. Feature Description of Semiconductor Devices...........................................................................15
5. Feature Description and Parameter Setting .......................................................................................... 16
5.1. Stun, Revive and Remote Monitor ......................................................................................................16
5.2. Scan.....................................................................................................................................................16
5.3. Zones................................................................................................................................................... 17
5.4. Setting.................................................................................................................................................. 17
5.5. TOT (Time-Out-Timer).........................................................................................................................18
5.6. EmergencyAlarm ................................................................................................................................18
5.7. Settings................................................................................................................................................19
5.8. Upgrade............................................................................................................................................... 19
6. Assembly and Disassembly .................................................................................................................... 19
6.1. Installing and Uninstalling the Battery.................................................................................................22
6.2. Installing and Uninstalling the Antenna...............................................................................................23
6.3. 6.3 Installing and Uninstalling Belt Clip...............................................................................................23

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6.4. Using an Earphone..............................................................................................................................23
6.5. Detaching Shell from the Base............................................................................................................24
6.6. Detaching Main Board from the Base .................................................................................................24
6.7. Explosion Diagram...............................................................................................................................25
7. Debugging ................................................................................................................................................. 29
7.1. Debugging Method ..............................................................................................................................29
7.1.1. Components needed for adjustment............................................................................................ 29
7.1.2. PC Test Mode Modulation Method ...............................................................................................29
7.2. Radio Test............................................................................................................................................ 30
8. General Specification ............................................................................................................................... 30
9. Equipment for Maintenance and Test..................................................................................................... 31
10. Troubleshooting .................................................................................................................................... 31
Appendix 1 Abbreviations ........................................................................................................................... 32
Appendix 2 Material List (Electronic Part)................................................................................................. 34
Table 1 Material List of Main Board DP480(400~470MHz)............................................................................34
Table 2 Material List of Module Board HS8861..............................................................................................47
Table 3 Material List of Key PCB.................................................................................................................... 63
Appendix 3 Material List (Structural Section) ........................................................................................... 64
Appendix 4 Accessory List.......................................................................................................................... 66
Appendix 5 Schematic Diagrams and Layout Drawings.......................................................................... 67
Schematic Diagrams of Main Board DP480(400~470MHz)..........................................................................67
Top-Layer Layout Drawing of Main Board DP480..........................................................................................73
Bottom-Layer Layout Drawing of Main Board DP480....................................................................................74
Schematic Diagram of Key PCB DP480 ........................................................................................................75
Top-Layer Layout Drawing of Key PCB DP480 .............................................................................................76
Bottom-Layer Layout Drawing of Key PCB DP480........................................................................................77
Schematic Diagrams of Module Board HS8861 ............................................................................................78
Top-Layer Layout Drawing of Module Board HS8861....................................................................................81

DP480 Service Manual
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1.Overview
1.1.Range of Application
This manual is intended for the maintenance of DP480 frequency-modulated handheld two-way radio, and
can be used only by the engineers and professional technicians trained by Kirisun. The parameters in this
manual are subject to change because of technology improvement. For the latest information, please
contact Kirisun or your local dealer.
Please carefully read this manual before repairing the radio.
1.2.Safety Precaution
Electromagnetic Radiation
A two-way radio generates and radiates electromagnetic energy. Kirisun two-way radios strictly conform to
Chinese and international standards of electromagnetic radiation. To ensure ideal communication and
human safety, please keep the device vertical to the ground and keep the microphone 2 ~ 5cm away from
the mouth while using the radio.
Electromagnetic Interference
To avoid electromagnetic interference, turn off the radio in a place where you are so instructed, for example,
a hospital, a health center and an airport.
Explosive Gases
You’d better shut down the radio when you are in an area with explosive gas (for example, the lower deck
of a hull, a container or transport facility of fuel oil or chemicals) or with chemical or particles, dust or metallic
dusts in the air, or near a blast area or an electric blasting detonator. Replacing or recharging the battery in
potentially explosive atmospheres is prohibited.
Damaged Antenna
You are suggested not to use the radio if the antenna is damaged. A damaged antenna may cause mild
burns when contacted with human skin.
Battery Life
To prolong the service life of the battery, avoid fully discharging the battery frequently. Please charge and
discharge the battery repeatedly if it will be not used for a long time. For satisfactory performance and safety,
you are suggested to replace the battery every two years.
Part Replacement
Pay attention to the model while replacing a part. Do not use a component not meeting the requirements of
Kirisun.
1.3.Maintenance Service
Warranty service is provided to the radio and the accessories, except in any of the following situations.

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⚫No provision of a valid warranty card or an original invoice
⚫Malfunction due to unpermitted disassembly, repair or modification
⚫Damage of the product due to wear, mechanical damage, burn or inlet of water
⚫Damaged product SN. or unidentifiable brand
Paid maintenance service will be provided after the warranty period. Meanwhile, we offer parts to authorized
maintenance stations and dealers at preferential prices, except those of discontinued products).
2.External View and Keys
2.1.External View
NO.
Description
NO.
Description
1
Lower Side Key (Programmable)
Programmable by a dealer to achieve
various functions. See 2.2
Programmable Keys.
9
LED Indicator
Red light on: The radio is transmitting
signals.
Green light on: The radio is receiving
signals.
Flashing red light: The battery is low.
2
PTT Key
Press it to make a call and talk.
10
Microphone
Input voice.
3
Upper Side Key (Programmable)
Programmable by a dealer to achieve
various functions. See 2.2
11
LCD screen

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Programmable Keys.
4
Antenna
12
Digital Keys
5
Speaker
Output voice.
13
External Interface
Connect to an external earphone or
programming cable
6
Programmable Key (Usually Alarm
Key)
14
Belt Clip
7
Channel Knob
Rotate it to select one from the
channels 1 to 16.
15
Battery
8
Power/Volume Knob
Turn it clockwise until a click is heard
to power on the radio. Turn it
counterclockwise until a click is heard
to power off the radio.
When the radio is on, turn it to regulate
the volume.
16
Battery Latch
2.2.Programmable Keys
To cater to users’ habits of operating the radio, programmable keys (i.e. side keys) are provided, which can
be configured as shortcut keys through programming by the dealer.
Note:
⚫Press: Press down and release quickly.
⚫Press and hold: Press down and hold still for a period, which is set through the CPS (customer
programming software).
NO.
Programming
Function
Function Description
1
None
The radio does not respond when this key is pressed.
2
Battery Level
Announcement
Announce the current battery level.
3
High/Low Power
Switch to high/low power.
4
Broadcast Call
Initiate a broadcast call.
5
Monitor
Switch to carrier squelch mode (i.e. cancel CTCSS) when the
selected analogue channel is CTCSS enabled. If carrier is matched,
voice will be output.

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NO.
Programming
Function
Function Description
To go back to the previous state, press the key again.
6
Emergency On
Send an emergency alarm. It is used to seek help under emergency.
7
Emergency Off
Exit emergency alarm.
8
Squelch On/Off
Under analogue channel, open voice reception path to receive weak
signals.
Under digital channel, no response when this key is pressed.
9
Zone Selection
Switch to next zone.
10
Scan
Start/stop scanning other channels and receive traffic from them.
11
Alert Tone On/Off
Enable/disable all alert tones.
12
Nuisance Delete
Delete an unnecessary channel (e.g. interference channel) dwelled
on during scan, and then continue scan.
13
Repeater/Talk
Around
On a repeater channel, press it to enter/exit repeater mode.
2.3.LED Indicator
LED Indication
Radio State
Red light on
Transmitting signals.
Green light on
Receiving signals.
Red Light Flashing
Low battery. Please charge it.
Green Light Flashing
Scanning channels
Orange Light Flashing
In call hold state under digital mode. Exit when hold time is up.
Orange Light on
The channel unusable. Switch to another channel to quit.
Red Light Flashing Fast
CPS is reading configurable parameters of the radio.
Green Light Flashing Fast
CPS is programming configurable parameters of the radio.

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3.Basic Operation
3.1.Powering On/Off
To power on the radio, rotate the Power/Volume knob clockwise until a click is heard.
To power off the radio, rotate the Power/Volume knob counterclockwise until a click is heard.
3.2.Selecting a Channel
When the radio is on, rotate the Channel knob to select a channel.
3.3.Adjusting Volume
When the radio is on, rotate the Power/Volume knob clockwise to increase the volume or counterclockwise
to decrease it.
3.4.Initiating a Call
If the selected channel is digital, you can call the default contact for the selected channel by pressing the
PTT key. This contact can be set by the dealer through programming.
3.5.Receiving a Call
When the radio receives RF signals on the selected channel and the squelch level is reached, the green
LED glows to indicate that carrier is received.
When the selected channel is digital channel and when it received individual call, group call or all call, the
radio will output the voice from the channel.
When the channel is analogue channel and when it received analogue signals with CTCSS matching the
one on this channel (or there is no CTCSS set on the channel), the radio will output voice form the channel.
3.6.Calling Back
When the selected channel is digital channel and after a call is received, press the PTT button within the
calling duration to call back. If the calling duration is up, you need to initiate a call. The calling duration can
be set by the dealer.
When the selected channel is analogue channel and after a call is received, press the PTT button and speak
to the microphone to call back.

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4.Circuit Description
4.1.Circuit Diagram of Main Board

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4.2.RF Circuit Diagram
4.3.Baseband Circuit Diagram
4.4.TX Circuit
The TX circuit includes an RF power amplification circuit, a low pass filter circuit and an automatic power
control circuit.

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⚫RF Power Amplification Circuit
RDA1846S outputs RF signal from pin 18 and enters first-level pre-drive amplifier (Q502) for initial
amplification; then it enters second-level pre-drive amplifier (Q503) and drive amplifier (Q501) for further
power amplification, ensuring sufficient drive power signal can be offered to final amplifier for ultimate power
amplification; after amplification by multiple amplifiers, the transmitted signal will complete the output
impedance match at the output terminal of final power amplifier through a section of microstripe, so as to
minimize output power loss from impedance match failure; afterwards, the transmitted signal will enter the
low pass filter through TX/RX switch.
⚫Low Pass Filter Circuit
The low pass filter which suppresses harmonic wave is an advanced Chebyshev filter composed of lumped
parameter inductor and capacitor. On a certain basis of in-band fluctuation, the filter can improve
suppression to out-of-band harmonic wave and spurious signal.
⚫Automatic Power Control Circuit (APC)
In the automatic power control circuit, the drain current from drive power amplifier and final power amplifier
completes switch from current to voltage through the sampling resistor and subtraction circuit which is made
of the first operational amplifier; the voltage will be compared with the APC control voltage output from DAC
at the second operational amplifier, and the error voltage that is output will change the transmitting power
through the grid bias voltage of the control power amplifier tube (including the drive level and final level).
4.5.RX Circuit
The RX circuit is mainly composed of RF low pass filter, RX/TX switch, low noise amplifier, AT1846S,
HS8861 and audio power amplifier.
⚫RX Circuit Front-end
The signal from antenna is sent though RX/TX switches (D500, D501, D502 and D503) to the U500
(AT1846S) for demodulation and output.
⚫RX Circuit Back-end
The analogue/digital signal which is demodulated and output by AT1846S, after completing demodulation
and processing of digital signal through DSP in HS8861, will be input to digital audio processor module for
further processing, and then be switched to analogue voice signal through DAC of codec; the analogue
voice signal will finally be amplified by external audio amplifier to drive the speaker.

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4.6.Power Section
The radio applies 7.4V lithium-ion battery for power supply. RF power amplification and audio power
amplification are directly powered by battery; the battery outputs 3.6V to supply power to PMU in AT1846S
and HS8861 through DC-DC switch; 3M, 3C and USB3.3V output from PMU separately supplies power to
other baseband circuits; the battery outputs 5V voltage through LDO and then outputs separate 5T and 5R
after control by Q100 and Q102.
RF PA: RF Power Amplifier Circuit Q500 (RD07MUS2B), Q501 (RD01MUS2)
Audio PA: Audio Power Amplifier Circuit U3 (TDA8547TS)
3M: EEPROM IC200 (AT24C512C)
3C: Transistor X500 (12.8M TCXO)
5T: RF Pre-drive Amplifier Circuit Q502 (2SC5108), Q503 (2SC3356)
DC-DC: PMU IC1 (HS8861), U500 (RDA1846S)
4.7.IC Description
4.7.1.Features of AT1846S
a. Integrated CMOS RF front-end
b. High linearity low-noise amplifier and mixer
c. Low IF receiver path
⚫Automatic DC offset calibration circuit
⚫High performance analogue/digital converter and digital/analogue converter
⚫Fully-integrated receiver filter

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⚫Digital AGC
⚫Modulation and demodulation technique based on digital signal processing technology
d. TX path of direct frequency synthesis
⚫Modulation method of direct frequency synthesis
⚫TX filter based on digital signal processing technology
⚫TX modulation gain number is adjustable
⚫Digital voice activates TX control
e. High-performance fractional PLL frequency synthesizer
⚫Fully-integrated in-chip RF VCO
⚫Fully-integrated internal loop filter
⚫Low phase noise
⚫Fast lock of phase
⚫High-frequency resolution with random frequency adjustable
⚫Built-in transistor frequency error calibration circuit
f. Sleep mode of ultra-low loss
g. Three wire serial digital interface control
4.7.2.Port Description of AT1846S
AVDD
1
Power supply
SCLK
2
Clock input for serial control bus
SDIO
3
Data input/output for serial control bus
AVDD
4
Power supply
XTAL1
5
Oscillator pin 1
XTAL2
6
Oscillator pin 2,control interface select
MODE
7
When MODE = VL, I2C Interface is select; When MODE = VH, SPI Interface is
select
SENB
8
Latch enable (active low) input for serial control bus
AFOUT
9
Audio signal output to speaker
NC*
10
No connection

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MIC_IN
11
MIC input
Cc
12
Compensation capacitor connection
AVDD
13
Power supply
NC*
14
No connection
RFIN
15
RF signal input
AVDD
16
Power supply
NC*
17
No connection
RFOUT
18
RF signal output
NC*
19
No connection
NC*
20
No connection
AVDD
21
Power supply
PABIAS
22
PA bias supply for PA
AVDD
23
Power supply
PDN
24
Chip enable, high active; Chip sleep, low active
GPIO7
25
Gpio7/vox (When Gpio7=VH, vox is active; else VL)
GPIO6
26
Gpio6 / sq
(When Gpio6=VH, sq is active; else VL)
GPIO5
27
Gpio5 / txon
(When Gpio5=VH, txon is active; else VL)
GPIO4
28
Gpio4 / rxon
(When Gpio4=VH, rxon is active; else VL)
GPIO3
29
Gpio3 / sdo
(Gpio3=VH or VL, it is the output register data in 4 wire control
Interface mode)
GPIO2
30
Gpio2 / int
(When Gpio2=VH, int is active; else VL)
GPIO1
31
Gpio1 / code_in / code_out

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(Gpio1=VH or VL, it is the input/output code data)
GPIO0
32
Gpio0 / css_in / css_out
(Gpio0=VH or VL, it is the input/output CTCSS/CDCSS signal)
4.7.3.Port Description of Master Chip HS8861
PIN NO.
Port NO.
Port Name
Function
E11
GPIO_D44
NC
NC
J19
BSENS
MAND_IN
IC level input under Man Down state
L22
ADC_IN
BAT_DET
Battery capacity detection
W13
GPIO_D7
PF
Input from side key
R14
GPIO_D6
BEEP_C
Switch of voice receiving / alert tone
W14
GPIO_D101
EERROM_WP
EEPROM
AA17
GPIO_D24
ECN_3
Channel switch
AB17
GPIO_D23
ECN_2
Channel switch
V15
GPIO_D11
KEYPAD5
4*4 keys
V16
GPIO_D99
KEYPAD3
4*4 keys
V17
GPIO_D100
MAND_C
IC power supply control under Man Down state
AA18
GPIO_D22
EXT_PTT
External PTT
U18
GPIO_D98
KEYPAD2
4*4 keys
V19
GPIO_D96
KEYPAD0
4*4 keys
U19
GPIO_D13
KEYPAD7
4*4 keys
T19
GPIO_D14
NC_GPIO
NC
U21
GPIO_D12
KEYPAD6
4*4 keys
T21
GPIO_D97
KEYPAD1
4*4 keys
V22
GPIO_D10
KEYPAD4
4*4 keys
F5
GPIO_D112
LCD_RS
LCD

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PIN NO.
Port NO.
Port Name
Function
AB19
LCD_CS1
LCD_RST
LCD
L21
SSI0_RX
SSI0_RX
FLASH
P21
SSI0_TX
SSI0_TX
LCD/FLASH
N21
SSN0
LCD_CS
LCD
M21
SSN1
FLASH_CS
FLASH
F6
GPIO_D111
NC
NC_GPIO
R21
SSI0_CLK
SSI0_CLK
LCD/FLASH
A12
VOUT_D9
VIO_3V_C
PMU_3V output
J14
GPIO_D76
UART_RXD0
Serial port 0
J15
GPIO_D75
UART_TXD0
Serial port 0
F22
BAT_DET
BAT_DET
Battery detection
J18
GPIO_D25
UART_TXD1
Serial port 1
H18
GPIO_D26
UART_RXD1
Serial port 1
E17
GPIO_D74
TONE_OUT
Output alert tone in PWM mode
E18
VSB
BATTERY
Access of clock to button cell battery
E21
SINK1
NC
NC
D23
SINK2
NC
NC
C18
GPIO_D88
I2C_SDA
EEPROM
A17
VOUT_D2
3M
PMU_3M output
C17
GPIO_D87
I2C_SCL
EEPROM
E14
GPIO_D49
NC
NC
C14
GPIO_D51
AFCO1
Audio power amplifier MUTE
E13
GPIO_D48
5TC
5TC
A13
VOUT_D3
3C
PMU_3M output
C13
GPIO_D52
DACS_SW1
DA_MCP4802

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PIN NO.
Port NO.
Port Name
Function
B13
GPIO_D47
5RC
5RC
E12
GPIO_D50
LDAC_PC/TV
DA_MCP4802
C12
GPIO_D53
AFCO2
Speaker output MUTE
A11
GPIO_D46
RDA_PDN
RDA1846S
A10
GPIO_D58
SPI/CS
RDA1846S
F11
GPIO_D2
NC_GPIO
B11
GPIO_D57
SPI/CLK
RDA1846S
B10
GPIO_D56
SPI/DA_OUT
RDA1846S
F10
GPIO_D0
RDA_SQL
SQL
E10
GPIO_D3
KEYPAD_BL
Backlight control
K18
GPIO_D107
NC
NC
B9
GPIO_D21
ECN1
Channel switch
A8
GPIO_D18
GREEN_LED
Green LED control
B8
GPIO_D16
PTT
PTT
A7
GPIO_D19
NC_GPIO
B7
GPIO_D20
ECO_0
Channel switch
C7
GPIO_D17
RED_LED
Red LED control
C3
AUX_OUTP
SPK+
Audio output after demodulation by HS8861
D3
AUX_OUTN
SPK-
NC
D1
M_MICP
AFDET
Transmit to HS8861 after reception and
demodulation by AT1846S
D2
M_MICN
NC
NC
E2
HP_MICN
MIC1
Transmit MIC signals to HS8861
H5
DM
USB_DM
USB
J5
DP
USB_DP
USB

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PIN NO.
Port NO.
Port Name
Function
L1
HPL_OUT
MOD1
Output digital MIC signals
M1
HPR_OUT
MOD2
NC
D21
SINK3
NC_SINK3
NC
B12
GPIO_D45
NC
NC
C11
GPIO_D55
NC_GPIO
NC
A9
GPIO_D59
APC_SW2
APC_SW2
C9
GPIO_D105
NC_GPIO
NC
C8
GPIO_D43
APC_SW1
APC_SW1
F15
GPIO_D8
NC_GPIO
NC
F14
GPIO_D9
QT/DQT IN
QT/DQT IN
F13
GPIO_D1
LCD_BL
LCD backlight control
4.7.4.Feature Description of Semiconductor Devices
Component NO.
Model
Description
IC500
NJM2904
APC, voltage comparison, drive
U21
HS8861
MCU
IC200
24LC512
E2PROM, saves channel frequency data, feature
parameters and modulation parameters
U3
TDA8547TS
Receiver audio power amplification
Q500
RD07S2B
TX final power amplification
Q4
DTA144EE
APC output switch
Q200
DTC144EE
Red LED driver
Q201
DTC144EE
Green LED driver
Q501
RD01MUS1
Transmitter power amplifier drive
Q601
DTC144EE
Audio power amplifier control switch

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IC100
XC6204B502
MR
5R, 5T voltage output
IC102
MP2359
3.5V voltage DC-DC output
U20
MCP4802
DA chip, used for modulation of power and frequency
stability
IC302
NJM2904
Operational amplifier for MIC signals
5.Feature Description and Parameter Setting
5.1.Stun, Revive and Remote Monitor
Stun
You can enable this function, so that the radio can be stunned after receiving a Stun command. A stunned
radio can only receive a Revive command but cannot send or receive other signals.
Revive
You can enable this function, so that a stunned radio can be revived after receiving a Revive command.
After the radio is revived, it can operate normally again.
Remote Monitor
When the radio receives Remote Monitor command, it will automatically turn on the transmitting and the
monitoring party can listen to the surroundings around the monitored radio.
5.2.Scan
Enabling Scan
Press the Scan programmable key to enable Scan and listen to activities on other channels. Press Scan
key again to exit Scan.
Scan List
Each channel can be related to one “Scan List” though dealer programming. The radio can only start Scan
on channels related with “Scan List”. Each “Scan List” contains a maximum of 16 channels (including the
current channel), and both analogue channels and digital channels can be contained. By selecting “Scan
List” menu, you can check the scan channels included in the “Scan List” used by the current channel.
Note:
If the scan channels in the list are changed, other channels which are related with the same list will be
affected during channel scan.
Nuisance (Temporary) Delete
During scan, when the radio stops on an unnecessary channel, e.g. interference channel, it can select

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Nuisance Delete to delete this channel before it goes on scanning. You can also add a temporary channel
during scan. After exiting scan mode, the channel which is temporarily deleted or added will turn invalid.
Scanning Revert Channel
During radio scan, press the PTT key to enable the radio to transmit or talk on the preset channel. This
channel can be set by local dealer using programming software.
Prior Scan
If a priority channel is set in a scan list, the channel will be scanned in cycle, i.e. being scanned once before
each common channel is scanned. For example, if a scan list has channels 1, 2, 3 and 4 with channel 2 set
as a prior channel, the scan order will be 1 → 2 → 3 → 2 → 4 → 1.
5.3.Zones
A group of available traffic channels constitute a zone. Please select a zone by pressing a side key.
5.4.Setting
The radio can be set to cater to your habits or meet your needs. Settings include power, squelch level, alert
tones, sleep mode, CPS password and speech encryption, and they may vary for different dealers.
Power
Under high power, communication distance is longer but battery life is shorter; under low power,
communication distance is shorter and battery life is longer. You can set a power level for each channel.
Squelch Level
You can set the squelch level of the radio to any of 0 to 9. The higher the squelch level is, the more noise
interference there will be and the harder to receive weak signals.
Alert Tone
You can enable or disable various alert tones via the PC Tool.
Microphone Gain
Microphone gain is the value based on which an audio level is amplified. You can adjust volume by setting
a microphone gain. The higher the gain is, the higher the volume will be.
Note:
To avoid speech distortion, do not set a too high gain.
Power-saving Mode
You can enable this mode to enable the radio to automatically enter power-saving mode if it has not
transmitted or received carriers for a set period. In this mode, fewer programs are run and less battery is
consumed, so that battery life is prolonged.
CPS Password
You can set a password for the CPS (customer programming software).