6.1 Control Circuit ................................................................................................................................. 22
6.1.1 No display upon power-on or abnormal display ................................................................... 22
6.1.2 No voice output by speaker .................................................................................................. 23
6.1.3 No modulation signal in transmission .................................................................................. 24
12. Parts List ........................................................................................................................................... 54
Page 8
Ua (400‐440 MHz)
Product Controls
1
1. Product Controls
No. Part Name No. Part Name
1 PTT (Push-to-Talk) Key
○
2 SK1 (Side Key 1)
○
3 Antenna
○
4 Speaker
○
5 LCD Display
○
6 OK/Menu Key
○
7 Up Key
○
8 Volume -/Left Key
○
9 Call Key
○
13 LED Indicator
○
14 Microphone
○
15 Cancel/Return Key
○
16 Volume +/Right Key
○
17 Power On/Off/ESC Key
○
18 P3 Key
○
19 Down Key
○
20 Charging/Data Connector
○
21 Earpiece Connector
○
Page 9
Product Controls
Ua (400‐440 MHz)
2
No. Part Name No. Part Name
10 P1 Key
○
11 P2 Key
○
12 Strap Hole / /
○
22 Battery Cover Open-up
○
23 Battery Cover
○
Page 10
Ua (400‐440 MHz)
Disassembly and Assembly
3
2. Disassembly and Assembly
This section is designed to introduce the way to disassemble the radio. To assemble the radio, do vice
versa.
Caution
Please position the waterproof ring properly during reassembly.
Use the thumb and index finger to move the silicon rubber of SK1 key until SK1 key is well
assembled.
Step 1 To remove the battery, do as follows.
Step 2 Remove the chassis.
Remove the four T6 screws and take out the chassis.
Page 11
Disassembly and Assembly
Ua (400‐440 MHz)
4
Step 3 Remove the main board.
1. First unplug the speaker connector and Keypad FPC connector, and then remove the one
T6 screw.
2. Take out the main board in the direction shown in the figure below.
Step 4 Remove the keypad board.
3. Remove the two screws on the back.
Page 12
Ua (400‐440 MHz)
Disassembly and Assembly
5
4. Remove the keypad board.
Step 5 Remove the LCD display.
5. Straighten the two fixing plates securing the LCD display. See the figure below.
6. Take out the LCD display vertically.
Page 13
Disassembly and Assembly
Ua (400‐440 MHz)
6
Step 6 Remove the aluminum chassis shielding cover.
7. Remove the three screws securing the aluminum chassis shielding cover.
8. Take out the aluminum chassis shielding cover.
Page 14
Ua (400‐440 MHz)
Exploded View and Packaging Guide
7
1
7500801000000
PORON
1
6002127000000
3
7500512000000
Motor PORON pad
1
7500809000000
Conductive sponge for aluminum
chassis
5
7400656000000
Earpiece PC sheet
1 30
6002126000000
Front case
1 6 /
PCB main board
1 31
7500717000000
Motor PORON
1 7 7500724000000
LCD PORON pad
1 32
6002128000000
Antenna cover
1
7102002500000
Transparent silicon rubber
light guide
7500376000010
Conductive sponge for earpiece
FPC
10
6203684000000
Decoration sheet (right side)
1 35
5001000000090
Speaker
1
Insulative PORON for
speaker
3. Exploded View and Packaging Guide
3.1 Exploded View
Parts list:
No. Part No.DescriptionQty.
2
4
8
9
11 / Model PC label 18x7mm1 36 7500784000000
No. Part No.DescriptionQty.
2 26 7400628000000 Speaker felt
Chassis1 27 6002144000000
1 28 6002113000000 Earpiece connector cover
1 29 6002124000000
Machine screw M2.0x2.5mm 2 33 6101008000000
1 34 4200040000300
Stopper for earpiece
connector cover
Micro USB cover1
Power Cord1
2
1
1
Page 15
Exploded View and Packaging Guide
Ua (400‐440 MHz)
8
12
6203683000000
Decoration sheet (bottom side)
1 37 / Antenna core
1
7500305000000
Silicon rubber pad for battery
connector
7600052000000
Self-tapping Screw
ST1.9*4.0mm
7500749000000
16 / Semi-finished keypad board
1 41
7400329000000
MIC pad
1
17
7300122000000
Metal dome for functional key
1 42
5002270000030
Microphone
1
7500748000000
Aluminum chassis shielding
cover
19
6101009000000
P&R keypad
1 44
6101018100000
Silicon rubber pad for battery
4
6002125000000
Silicone rubber plug for RF
test port
21
6203685000000
Decoration sheet (left side)
1 46
6101023100000
Main waterproof ring
1
22
6002110000000
PTT key cover
1 47
6101022100000
Waterproof ring for battery
1
23
6101052100000
PTT key (silicone rubber)
1 48
6002129000000
Battery Cover
1
6203682000000
7500756000000
No. Part No.DescriptionQty.
13
14
15
18
20
24
25
PORON pad for connector1 38 6101083100000
Conductive sponge for front case1 39 7101904020200
Double-sided adhesive tape for
keypad FPC
Double-sided adhesive tape for
LCD lens
LCD lens1 45 6101059100000
Speaker steel felt1 49 /
Double-sided adhesive tape for
speaker steel felt
No. Part No.DescriptionQty.
1 40 7400141000000
1 43 6300253000000
1 50 6002132000000
Note
Parts that are not marked with Part Number may vary with the frequency band.
NSM08Z01 MIC felt1
PC label with LOGO
19.7x4.8mm
BC21 belt clip1
1
3
1
1
1
Page 16
Ua (400‐440 MHz)
Exploded View and Packaging Guide
9
3.2 Packaging Guide
Page 17
Specifications
Ua (400‐440 MHz)
10
Battery Life (5-5-90 Duty Cycle,
Battery
Dimensions (H×W×D)
(with standard battery, without
antenna)
Weight (with antenna &
standard battery)
4. Specifications
General
Frequency Range
400‐440 MHz
Channel Capacity 256
Channel Spacing 25 kHz/12.5 kHz
Rated voltage: 3.7 V
Operating Voltage
Extreme voltage: 3.15–4.2V
Battery 2000 mAh Li-Ion battery
High TX Power)
Analog: 10 hours
High-capacity 2000mAh Li-Ion
Digital: 12 hours
Operating Temperature
°
C to +60°C
-30
106 mm × 57 mm × 23 mm
About 180 g
Frequency Stability ±0.5 ppm
Analog
0.28 μV (12 dB SINAD)
Sensitivity
0.22 μV (Typical) (12 dB SINAD)
0.22 μV (20 dB SINAD)
Digital: -116 dBm/BER5%
TIA-603: 60 dB@12.5 kHz/70 dB@25 k
Adjacent Channel Selectivity
ETSI: 60 dB@12.5 kHz/70 dB@25 kHz
TIA-603: 70 dB@12.5/25 kHz
Intermodulation
E
TSI: 65 dB@
TIA-603: 70 dB@12.5/25kHz
Spurious Response Rejection
ETSI: 70 dB@12.5/25kHz
Receiver
Hz
12.5/25 kHz
Blocking 84 dB
Page 18
Ua (400‐440 MHz)
Specifications
11
Rated Audio Power Output 0.4 W (8Ω load)
Rated Audio Distortion ≤5%
Transmitter
Power Output 3 W/1.5 W
Conducted/Radiated Emission
Modulation Limiting
FM Noise
Audio Distortion ≤3%
-36 dBm<1 GHz
-30 dBm>1 GHz
±2.5 kHz@12.5 kHz
±5.0 kHz@25 kHz
40 dB@12.5 kHz
45 dB@
25 kHz
Note
All Specifications are tested according to applicable standards, and subject to change without notice
due to continuous development.
Page 19
Circuit Description
Ua (400‐440 MHz)
12
CODEC
TLV320AIC3204
STM32F101VET6
AMP
MAX9716EUA
MCLK
BCLK
WCLK
DIN
DOUT
MCLK
VDD3V3
12.288MHZ
SCL
SDA
Security Key
I2S
HPI
VOICE
CODER
Protoccol
Stack
4FSK
FM
Demod
Channel
Selection
SCT3928
S0CLK
S0FS
S0DO
S0DI
S1CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_CLK
FLASH_CE
FLASH_DI
FLASH_DO
MCU
PLL_CLK
PLL_STB
PLL_DATA
PLL_LD
MOD_VCO
MOD_REF
AFDET
SQL
RSSI
BAT_DET
APC/TV
ADJ_CRY
Volume
adjust
BEEP
3V0A
BAT
T/R
SW-CVread
BIAS_DOWN
RSSI
PTT
12MHZ
OPT_SEL
R/G
RESET
3V3D
W/N
EEPROM
24FC512-I/SM
I2C
3V3D
3V0D
1V2
LOR
LOL
IN3R
IN1L
HPL
IN2L
AF_MUTE
AF_MUTE
USART port
VOX
VOX
EXT_interface
ext_mic
ext_spk
V_CHARGER
LCD
LCD_RSTB
LCD_CSB
LCD_SDA
LCD_SCLK
A0
5. Circuit Description
5.1 Baseband6HFWLRQ
5.1.1 Power Supply Module
Diagram of Power Control
The power supply employs a single 3.7V li-ion battery. The RF section uses LDO to regulate WKHYROWDJHWR 3V
for FGU and PLL circuits and the control parts of RX and TX circuits. The BB section uses ORZGURSRXW/'2
to regulate WKHYROWDJHWR 3V for Codec, MCU and S
DC/DC to c
onvert the voltage to 1.2V.
CT3928. The core power supply of SCT3928 uses
Page 20
Ua (400‐440 MHz)
Circuit Description
13
3 VRT
U301
LDO
RP102N 301B
PWR- KEY_ DET
To PLL
SCT3928
PWR_ON
POWER_ON
U302
LDO
RP102N 301B
U307
LDO
RP102N 301B
DTC114YE
U310
DC-DC
TPS62561DDCR
3V0A
3V0D
A
3V0
U308
LDO
RP102N 301B
POWER_ON
POWER_ON
POWER_ON
POWER_ON
PWR_STC3V
U306
LDO
RP102N 301B
EM6M2
VDD_OP
To APC
To autio PA
To RF PA
To APC REF
VBAT
TP609
U608
CHARGER
MC 34673
CHG
VBUS
PPP
After inserted the charger, wake
up the walky- talky
Read charger status
Detect charger inserted
EM6M2
EM6M2
3V_TX_ RF
3V_ RX_RF
TEM-LEV- DET-TC
TX_EN
RX_EN
To SCT 3928 ,U203( Security Key),crystal, Codec
To LED
To SCT3928
To_ EEPROM
To MCU
To Codec LDOIN
RESET
To Mic amp
RESET
R 3112Q271A
POWER_ KEY-
POWER_ KEY-
To keypad( hardware connectted)
DC2DC_ CTRL
To VCO
To FAST LOCK
VCC_VC_ TCXO
3V0_ FGU_PER
VCC_CP
DTC114YE
CHG_ CURRENT
ISET
U309
XC6118N28
AMR-G
3V FGU
U304
LDO
RP102Z301D
1V2D
To LCD
VCO buffer and amp.
POWER_ON
TX_EN
LED_LCD_BL
Powering On/ Off
Page 21
Circuit Description
Ua (400‐440 MHz)
14
When \RXlong press the Power O
the radio powers
level.
Duri
ng power-off, POWER_KEY- is at low level, while PWR-KEY_DET is at high level. The system
detects power-off procedure via PWR-KEY_DET and implements the power-off procedure. Then
PWR_ON and POWER_ON go to low level, and the power is cut off.
RQ. After power-on, PWR_ON
n-Off/ESC key, POWER_KEY- and POWER_ON are at high level, and
goes to high level, and PWR-KEY_DET goes to low
Page 22
Ua (400‐440 MHz)
Circuit Description
15
STM32F101 VET6
VDD3V3
12.288 MHZ
HPI
VOICE
CODER
Protoccol
Stack
4 FSK
FM
Demod
Channel
Selection
SCT3928
S0 CLK
S0FS
S0DO
S0DI
S1 CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_ CLK
FLASH_CE
FLASH_DI
FLASH_DO
MCU
PLL_CLK
PLL_STB
PLL_ DATA
PLL_LD
SQL
RSSI
BAT_DET
APC/TV
ADJ_CRY
Volume
adjust
T/R
SW-CVread
BIAS_DOWN
RSSI
PTT
12MHZ
OPT_SEL
R/G
RESET
3V3D
W/N
EEPROM
24FC512-I/ SM
I2C
3V3D
3V0D
1V2
AF_ MUTE
USART port
VOX
EXT_ interface
ext_mic
ext_spk
V_ CHARGER
LCD
LCD_RSTB
LCD_CSB
LCD_SDA
LCD_SCLK
A0
5.1.2 Control Module
Page 23
Circuit Description
Ua (400‐440 MHz)
16
SCT3928
RESET IC
RESET
RSTN
CODEC
MCU
Codec_RESET
LCD
LCD_RSTB
CODEC
TLV320AIC3204
AMP
MAX9716EUA
MCLK
BCLK
WCLK
DIN
DOUT
MCLK
VDD3V3
12.288MHZ
SCL
SDA
Security Key
I2S
VOICE
CODER
Protoccol
Stack
4FSK
FM
Demod
Channel
Selection
SCT3928
S0CLK
S0FS
S0DO
S0DI
S1CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_CLK
FLASH_CE
FLASH_DI
FLASH_DO
MOD_VCO
MOD_REF
AFDET
BEEP
3V0A
BAT
3V0D
1V2
LOR
LOL/R
IN3R
IN1L
HPL/R
IN2L
AF_MUTE
VOX
These two signals go to FGU
for modulation
This signal is output via BA4116
after RX down conversion
The radio uses STM32F101VET6(MCU) and SCT3928(Baseband IC). STM32F101VET6 is the main
controller unit, while SCT3928 is the baseband processor chip, which is used for analog and digital
modulation/demodulation and digital voice encoding/decoding. MCU communicates with SCT3928 via
HPI BUS, connects to 512K EEPROM via I2C BUS and controls the LCD display via SPI BUS.
STM32F101VET6 uses the 12MHz crystal oscillator as the clock signal while SCT3928 uses the
12.288MHz crystal oscillator as the clock signal.
Reset Signal
5.1.3 Audio Module
Audio Diagram
The audio processing section uses SCT3928 and TLV320AIC3204. The audio amplifier uses
MAX9716EUA. The diagram is as follows:
The audio module is mainly composed of:
RX path
The signal demodulated by RF module is sent to the input port of third path of TLV320AIC3204 for
amplifyi
internal processing. Then the signal is sent to TLV320AIC3204 via I2S interface for GLJLWDOWRDQDORJ'$
conversion and amplifying.
ng. After DQDORJWRGLJLWDO$' conversion, the signal is sent to SCT3928 via I2S interface for
Page 24
Ua (400‐440 MHz)
Circuit Description
17
Rated Power (Po)
0.4W
R L =8Ω
Maximum Power (P
)
0.8W
R L =8Ω
)LQDOO\the audio signal is output to audio amplifier MAX9716EUA for amplifying via the HPL/R port of
TLV320AIC3204 to drive the speaker.
TX path
The audio signal UHFHLYed by the MIC is divided into two paths: one path is proc
for VOX sa
the signal is sent to SCT3928 via I2S interface for internal processing. Then the signal is sent to
TLV320AIC3204 via I2S interface for DA conversion and amplifying. Finally, the audio signal is output to
FGU for two-path modulation via the LOL/R port of TLV320AIC3204.
External Connector
Earpiece connector: Ф2.5mm standard earpiece connector for specific earpiece.
USB port: It is used for battery charging and programming.
mpling; the other path is sent to TLV320AIC3204 for AGC amplifying. After AD conversion,
essed and sent to MCU
Audio Amplifier
Main parameters of MAX9716EUA are listed in the table below:
Frequency: 38.4MHz
Current Drain≤ 2mA
output level≤ -22dBm
Pi Attenuator
Lo input level≥7dBm
IL:0.5dB
Zin/Zout:50R
Attenuator Protect
RB706F
3Vdc
Double Circuit
2SC5108
3VFGU
VCTCXO
19.2MHz
BA4116FV
AF OUT
5.2.2 Receiver Circuit
The receiver circuit mainly comprises the RF band-pass filter, low-noise amplifier, mixer, IF filter, IF
amplifier and IF processor.
Receiver Front-end
The HF signal from the low-pass filter passes through the electrically tunable first-stage band-pass filter
controlled via APC/TV1 level, to remove out-of-band interference signal and to send wanted band-pass
signal to the low-noise amplifier (Q6005). The amplified signal goes to a second-stage band-pass filter
which is also controlled via APC/TV1 level, to remove out-of-band interference signal generated during
amplification, and to send GHVLUHG HF signal to the mixer.
ThLV+) signal passes through the RF band-pass fi
(D6009). M
eanwhile, the first local oscillator (LO) signal generated by VCO passes through the low-pass
filter and also goes to the mixer (D6009). In the mixer, the +) signal and the first LO signal are
mixed to generate the first IF signal (38.85MHz). Then the ,)signal passes through the frequency selection
network composed of LC, to suppress carriers other than the first IF signal, and to increase the isolation
between the mixer and the IF filter. After that, the first IF signal is processed by the crystal filter (Z6001),
and is sent to the IF amplifier circuit (Q6006) for amplification. Then the amplified signal goes to the IF
processor BA4116FV for processing.
lter and low-noise amplifier and goes to the mixer
Page 27
Circuit Description
Ua (400‐440 MHz)
20
Receiver Back-end
The processed first IF signal is sent to IC BA4116 for second mixing during which the second harmonic of
the PLL crystal is selected as the second LO signal, mixed and converted to the 450 kHz second IF signal.
After that, the second IF signal goes through the 450 kHz ceramic filter to filter out the spurious signal,
and it is amplified afterwards with its frequency discriminated. Then the second IF signal is processed
internally and demodulated. Finally, the demodulated signal is sent to the baseband section for audio
processing.
5.2.3 )UHTXHQF\*HQHUDWLRQ8QLW)*8
The FGU, composed of VCO and PLL, is the core module of the whole TX-RX system. This unit
provides accurate carrier frequency during transmission, and stable LO signal during receipt. It has a
direct influence on the performance of the system.
Page 28
Ua (400‐440 MHz)
Circuit Description
21
RX_VCO
PLL Sky72310
Buffer
AmpT/R_Switch
RF feedback LPF
TX_VCO
Mod_1
Loop Filter
VC_TXCO
Mod_2
PN: ≤-80 (dBc/Hz)@1KHz
PN: ≤-112 (dBc/Hz)@12.5KHz
PN: ≤-120 (dBc/Hz)@25KHz
PN: ≤-136 (dBc/Hz)@100KHz
PN: ≤-145 (dBc/Hz)@1MHz
Two Point modulation:
0.1~5KHz modulate
ripple≤±0.5dB
Fc=19.2MHz
To TX
To Mixer
2SC5108
Gain≤5dB
isolation≥20dB
Current≤4mA
2SC3356
Gain≥10dB
isolation≥15dB
Current≤10mA
3dB BW≤3.5K
Phase Margin:30-55°
A=0.1Vpp~2.0Vpp
S21=-3dB
Fpass=500MHz
Fstop=800MHz
Astop=40dB
Kv≤30MHz/V
CV=0.8~2.3V
F=361.15~401.15MHz
PN≤-116dBc/Hz@12.5KHz
Kv≤30MHz/V
CV=0.8~2.3V
F=400~440MHz
PN≤-116dBc/Hz@12.5KHz
3.0v for core&Vp
Compare frequence:4.8MHz
Prescaler Level:50~250mVpp
The 19.2MHz frequency generated by the reference crystal oscillator goes to PLL for division,
generating the reference frequency (i.e. step frequency f1). Meanwhile, the frequency generated by
VCO goes into the PLL, where frequency f2 is generated through frequency division. Then frequencies
f1 and f2 are compared in the phase detector (PD), to generate continuous pulse current. The current
goes to the loop filter for RC integration, and is then converted to CV voltage. Then the CV voltage is
sent to the varactor of VCO. 7KHYDUDFWRUadjusts the output frequency of VCO directly until the CV voltage
becomes
through two buffer amplifiers.
:RUNLQJ Principle of VCO
VCO employs Colpitts oscillator circuit. There are two types of VCO: RX VCO and TX VCO. RX VCO
provides LO signal while TX VCO provides carrier for TX signal. When operating, WKHRVFLOODWRU
obtains different output frequencies by Fhanging the varactor's control voltage (i.e. CV voltage) and then
uses the control signals VCC_VCO_L and VCC_VCO_H to switch operating status. VCO_L is used for
receiSW while VCO_H is
Two-point Modulation
In TX mode, the two-point modulation is employed, to obtain higher modulation accuracy and
lower 4FSK bit error rate. MOD_VCO and MOD_REF send the modulation signal to the modulation end
of VCO and the reference crystal oscillator of PLL respectively to modulate TX VCO and the reference
crystal oscillator.
constant. Then PLL is locked, and the stable frequency output by VCO goes to the TX-RX channel
used for transmiVVLRQ.
Page 29
Troubleshooting Flow Chart
Ua (400‐440 MHz)
22
6. Troubleshooting Flow Chart
6.1 Control Circuit
6.1.1
No 'isplay upon 3ower-on or $bnormal 'isplay
No display upon power-on or
abnormal display>@
The voltage of TP304
(V_BAT) is normal?>@
Yes
The POWER_KEY- signal
(R306) is at high level
when holding down the
Power On/Off key?
Yes
The power supply of LCD
is normal?
Yes
The LCD clock, reset and
data signals are normal?
No
MCU power supply and clock
are normal?
No
No
No
Yes
No
Check whether the battery voltage
is too low or whether the contact
spring plate works well
Check whether the keypad
board and its connection are
normal
Check U307
Check whether the LCD and
its connection are normal
Check whether X100 crystal
oscillator and U302 are
normal
Yes
MCU reset signal (14-pin) is
normal?
Yes
1V2D, 3V0D, 3VRT and
3VFGU are normal?
Yes
12.288MHz clock is
normal?
Yes
Completed
No
No
No
Check U103
Check U300, U302, U306 and
U304
Check the clock generation
amplifier circuits of X200, Q200
and U204
Description of Normal Situations:
[1] The LED indicator works properly after the radioSRZHUVRQ.
[2] The radio can be powered on normally when the battery voltage is higher than 3.15V.
Page 30
Ua (400‐440 MHz)
Troubleshooting Flow Chart
23
Yes
No
No
Yes
No
Yes
Completed
SPK+ and SPK- output
normally?
Check the speaker
and its connection
No voice output by
speaker
U802 has audio signal
inputs (C810 and C820)?
U802 enable signal
is normal?
CODEC audio input
(AF_IN) is normal?
No
Refer to receiver
circuit for repairing
information
3V0D and 3V0A are
generated normally?
Check U301,U302
Yes
CODEC Reset is normal?
Yes
U802 is abnormal or
damaged
No
Check D8005 and
MCU
No
Check MCU
Does CODEC send data to
SCT3928 (SIDI signal)?
CODEC is abnormal
or damaged
No
Yes
Does SCT3928 send
data back to CODEC
(SIDO signal)?
CODEC is abnormal
or damaged
No
No
MCU controls
SCT3928 normally?
SCT3928 is abnormal
or damaged
Yes
Yes
Yes
6.1.2 No 9oice 2utput by 6peaker
Page 31
Troubleshooting Flow Chart
Ua (400‐440 MHz)
24
No
Yes
Yes
MIC inputs normally?Check MIC
No modulation signal
in transmission
CODEC audio input
(MICN2/MICP2) is normal?
CODEC output (R202,
R204) is normal?
Refer to FGU diagram
for repairing
information
No
Check whether U401
works normally
No
Yes
Completed
Does CODEC send data to
SCT3928 (SIDI signal)?
CODEC is abnormal
or damaged
No
Yes
Does SCT3928 send
data back to CODEC
(SIDO signal)?
CODEC is abnormal
or damaged
No
No
MCU controls
SCT3928 normally?
SCT3928 is abnormal
or damaged
Yes
Yes
CODEC power supply and
reset signals are normal?
Check MCU and
related LDO
No
Yes
6.1.3 No 0odulation 6ignal in 7ransmission
Page 32
Ua (400‐440 MHz)
Troubleshooting Flow Chart
25
Check Q6005
Second LO is normal?[6]
Input IF signal via z6001 to
check whether IF sensitivity
is normal?[5]
Check U306
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No receiving
No
Yes
Yes
Check RX VCO
Yes
No
Yes
No
No
Yes
3V_RX_RF outputs
normally?[1]
The static working
point of Q6005 is
normal?[3]
Yes
Completed
No
3VRT
outputs normally?[2]
Check Q6006
Check Q611
and peripheral
components
Check X8001
and related
components
19.2 MHz is normal?[7]
The static working
point of Q6006 is
normal?[4]
LNA_Out output is
normal?[8]
Check Q6005 and
front-end RF circuit
LO signal output is
normal?[9]
RX_LO output is
normal?[10]
First IF output is
normal?[11]
Check Z6001, Q6006 and
peripheral circuit
Input signal is normal?[12]
Check signal frequency,
amplitude and modulation
information
6.2 Receiver Circuit
Page 33
Troubleshooting Flow Chart
Ua (400‐440 MHz)
26
Description of Normal Situations:
[1] Output voltage by Q6004 Pin 3 is about 3V.
[2] Output voltage by U306 Pin 5 or input voltage by Q6004 Pin 4 is about 3V.
[3] Check the collector voltage and base voltage of Q6005 when WKHFLUFXLWLVnot receiving signals. Normally, the
voltage is about 0.754 V at pole B, about 2.728 V at pole C and 0 V at pole E.
[4] Check the collector voltage and base voltage of Q6006 when WKHFLUFXLWLVnot receiving signals. Normally, the
voltage is about 0.754 V at pole B, about 2.25V at pole C and 0 V at pole E.
[5] Cut off the front-end circuit, and input a 38.85 MHz IF signal (with modulation signal) at C6094 to test
IF sensitivity. Normally, the IF sensitivity is -109dBm.
[6] Frequency of Q611 is 38.4 MHz (output by C697).
[7] Frequency output by 2NDLO_1 is 19.2 MHz.
[8] Input a -40dBm RF signal at the antenna connector and test at R6047. Normally, gain is KLJKer than
10 dB and output signal is VWURQJer than -0 dBm.
est at C609
[9] T
(current channel frequency) with amplitude of about 5 dBm.
[10] Test at D502 (the post-stage circuit has not been cut off). Normally, the frequency is -38.85 MHz
(current channel frequency) with amplitude of about 0 dBm.
[11] Frequency output by mixer is 38.85 MHz.
[12] The input signal in the antenna portLVG%Pwith standard tuning information (AF=1 kHz,FM=3 kHz).
3 (the post-stage circuit has not been cut off). Normally, the frequency is -38.85 MHz
6.3 Transmitter Circuit
Caution
The following tests must be operated with a power supply of 3.7 V.
Page 34
Ua (400‐440 MHz)
Troubleshooting Flow Chart
27
No
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
YesNo
No
Yes
Yes
No
No
No
Yes
YesNo
Yes
No
Completed
YesNo
No
Yes
No
Yes
No
Yes
No power
output
Completed
Completed
Completed
Completed
Completed
Power supply works
normally?[1]
Check the
power supply
circuit.
VGG is
normal?[2]
APC/TV1 is
normal?[3]
Check the MCU
output circuit.
3V_TX_RF
is normal?[5]
TX_En 3.3V is
normal?[4]
TX_En is
normal?[5]
Replace Q7010
and U7001
Replace Q6008
Check the power
supply circuit.
Power level is
normal?[6]
D8021, RF connector
and the low-pass network
are normal?[7]
Match network
is normal?[8]
Q404 and Q406
work normally?[9]
Q405 works
normally?[10]
Q606 works
normally?[11]
Check the
output circuit of
FGU.
Power level is
normal?
Power level is
normal?
Power level is
normal?
Power level is
normal?
Repair damaged
components.
Repair damaged
components.
Power level is
normal?
Replace Q404, Q406
and bias resistor.
Replace Q406 and
bias resistor.
Replace Q606 and
bias resistor.
Yes
Q7004 works
normally?[12]
Yes
No
No
Yes
Completed
Power level is
normal?
Replace Q7004 and
bias resistor.
Description of Normal Situations:
Page 35
Troubleshooting Flow Chart
Ua (400‐440 MHz)
28
[1] Voltage of the power supply is about 3.7 V.
[2] For low power, VGG is 1.2 to 1.4 V; for high power, VGG is 1.4 to 1.6 V.
[3] For low power, TV/APC is 1.4 to 1.6 V; for high power, TV/APC is 2.0 to 2.2 V.
[4] TX_En is about 3 V.
[5] 3VA_TX_RF is about 3 V.
[6] High power is about 2.6 W; low power is about 1.5 W.
[7] Start-up voltage of D8021 is about 0.7 V. The low-pass coil must be soldered appropriately and
remain in good condition. The RF connector must remain in good condition.
[8] The match components must be soldered appropriately and remain in good condition.
[9] Vdd is about 3.7 V; for low power, Vgg is 1.2 to 1.4 V; for high power, Vgg is 1.4 to 1.6 V.
[10] Vdd is about 3.7 V; for low power, Vgg is 1.2 to 1.4 V; for high power, Vgg is 1.4 to 1.6 V.
[11] Check the collector voltage and base voltage when there is no power output IURP Q606.
[12] Check
e collector voltage and base voltage when there is no power output IURP Q7004.
th
Page 36
Ua (400‐440 MHz)
Troubleshooting Flow Chart
29
Q106 、Q110
输出是否正常?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
No
Yes
No
No
No
No
Completed
Yes
No
No
Yes
FGU check
Check the power supply
circuit.
3VFGU, VCC_CP and
3VOA_FGU_PLL are
normal?
VCO oscillates?
CV is normal?[3]
Q8007 and Q8010 are
normal?[5]
Replace Q8007
and Q8010.
Q8002, Q8003, Q8005,
Q8009 and Q8011 are
normal?[1]
Replace Q8002,
Q8003, Q8005, Q8009
and Q8011
Q8004/Q8008 are
normal?[2]
Check Q8004, Q8008
and peripheral
components.
Replace Q8004 and
Q8008.
Replace L8018 and
L8045.
L8018 and L8045
are normal?[4]
Feedback is output?
Check the feedback
circuit.
19.2MHz crystal
oscillates?
Check the 19.2MHz
circuit.
Sky72310 clock is
normal?[6]
Check the data control
circuit of Sky72310.
Check Q8007,
Q8010 and
peripheral
components.
No
Signal
Amplitude is
normal?[7][8]
Check the data control
circuit of Sky72310.
6.4 FGU Circuit
Description of Normal Situations:
[1] During WUDQVPLVVLRQ, Q8002 Pin 3 outputs the voltage of about 3 V. Dur
outputs the voltage of about 3 V.
[2] During
WUDQVPLVVLRQ, the voltage is about 1.13 V at pole E of Q8008, about 2.84 V at pole C and about
ing receiptg, Q8003 Pin 3
Page 37
Troubleshooting Flow Chart
Ua (400‐440 MHz)
30
1.63 V at pole B. During receiving, the voltage is about 1.17 V at pole E of Q8004, about 2.83 V at pole C
and about 1.88 V at pole B.
[3] The CV value varies with frequencies. Generally, it is above 0.55 V and below 2.4 V.
[4] L8018/L8045 i
[5]
Normally, the voltage is about 2.71 V at pole C of Q8010, about 0.67 V at pole B and about 0.04 V at
s on.
pole E; the voltage is about 2.6 V at pole C of Q8007, about 0.84 V at pole B and about 0.12 V at pole E.
[6] PLL_Clk outputs 960 kHz clock.
[7] During receipt, D501 is off and D502 is on, the positive pole voltage is about 1.02 V; during
transmission, D501 is on a
[8] During norma
l operation, when there is no load connected to the post-stage of C8072 and C8124, the
nd D502 is off, the positive pole is at a voltage of about 1.02 V.
power output is about 4 dBm. When the post-stage of C8098 is disconnected, the power output of
Q8007 is about 1.25 dBm when transmitting and about 2.5 dBm when receiving.
Page 38
Ua (400‐440 MHz)
Interface Definition
31
7. Interface Definition
The definition of each pin is described as below.
Interface Pin No. Signal Function
1 VBUS
2 RXD1
J5004
J800
3 TXD1
4 TD_IO
5 GND
1 SPK+
2 MIC+
3 GND
Page 39
Tuning Description
Ua (400‐440 MHz)
32
Reference Oscillator
Observe the frequency displayed on HP8921, and adjust the vernier until
Transmit Power
> Transmit
±
±
8. Tuning Description
8.1 Tools
Radio communication test sets: Aeroflex 3920 and HP8921
3 A/ 10 V power supply
Multimeter
Tuner software
8.2 Tuning Procedure
8.2.1
After re-assembling the radio, you need to tune it with the Tuner software.
The specific operations are described in the table below.
TX Section
Warp
Tuning a radio
Items Method
1. Connect the antenna connector of the radio to HP8921, and set HP8921
to TX test mode.
2. Open the Tuner software and go to “TUNE_DATA -> TX -> R
Oscillator Warp” in the left navig
On” button.
3.
the frequency offset is less than or equal to 40 Hz.
4. Click the “Transmit Off” button.
ation tree. Then click the “Transmit
eference
Here takes the TX low power tuning for example.
1. Connect the antenna connector of the radio to HP8921, and set HP8921
to TX test mode.
2. Open the Tuner software and go to “TUNE_DATA -> TX -
Power Calibration” in the left navigation tree. Then select an
Calibration
appropriate channel.
3. Click the “Transmit On” button.
4. Adjust the power to the required level as follows:
L: 1.5
H: 2.6
0.3 W
0.3 W
Page 40
Ua (400‐440 MHz)
Tuning Description
33
Observe the frequency deviation displayed on HP8921, and adjust the
Observe the frequency deviation displayed on HP8921, and adjust the
Enter
Items Method
1. Connect the antenna connector of the radio to HP8921, and set HP8921
to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz
Filter1: <20 Hz HPF
Filter2: <15 kHz LPF
Transmit-to-Deviation
De-Emphasis: OFF
3. Open the Tuner software and go to “TUNE_DATA -> TX
Transmit-to-Deviation” in the left nav
“Transmit On” button.
4.
vernier on Tuner until the frequency deviation is 4.3k±50 Hz.
5. Click the “Transmit Off” button.
1. Connect the antenna connector of the radio to HP8921, and set HP8921
to TX test mode.
2. Set the HP8921 parameters as follows:
IF Filter: 230 kHz
Filter1: <20 Hz HPF
Filter2: <15 kHz LPF
igation tree. Then click the
->
De-Emphasis: OFF
AFGen1 Freq: OFF
Modulation Balance
AFGen Lv1: 15.5 mV
3. Open the Tuner software and go to “TUNE_DATA -> TX -> Modulation
Balance” in the left navi
channel and click the dialog box below HI_PORT.
4. Click the “Transmit On” button.
5.
value in the dialog box on Tuner until the frequency deviation is 5k±50
Hz.
6. Press the
key on the keyboard to confirm your settings if the value
gation tree. Then select an appropriate
Page 41
Tuning Description
Ua (400‐440 MHz)
34
is input via the keyboard. If the value is adjusted via the vernier, skip this
Adjust the value in the dialog box until the frequency deviation displayed
he keyboard. If the value is adjusted via the vernier, skip this
Observe the value displayed on the HP8921 and adjust the vernier until
is input via the keyboard. If the value is adjusted via the vernier, skip this
Items Method
step.
7. Click the “Transmit Off” button.
8. Click the dialog box below LOW_PORT.
9. Set AFGen1 Freq to 1.4 kHz on HP8921.
10. Click the “Transmit On” button.
11.
on HP8921 is 5k±50 Hz.
12. Press the Enter key on the keyboard to confirm your settings if the value
is input via t
step.
13. Click the “Transmit Off” button.
14. Select another channel and repeat Step 3 to Step 13.
RX Section
1. Connect the antenna connector of the radio to HP8921.
2. Connect the Audio Out port of the radio to the Audio In port of HP8921,
and set HP8921 to RX test mode.
3. Set the HP8921 parameters as follows:
Output RF signal: -118 dBm/Frequency
Modulation frequency: 1 kHz
Front-end Filter
Modulation deviation: 3 kHz
De-Emphasis: 750 us
4.
the SINAD value is more than 18 dB.
5. Set the HP8921 parameters as follows:
Output RF signal: -35 Bm/Frequency
6. Observe the value displayed on the HP8921 and adjust the vernier until
the SINAD value is less than 10 dB.
7. Press the Enter key on the keyboard to confirm your settings if the value
Page 42
Ua (400‐440 MHz)
Tuning Description
35
Items Method
step.
8.2.2 Testing a radio
After tuning the radio, it is required to test the digital RF signal.
Transmitting
Step 1 Open the Tuner software and go to “TEST -> TX -> Transmit BER (0.153)”.
Step 2 Select the channel to be tested and select “High Power” in “Parameter”.
Step 3 Set the Aeroflex 3920 parameters as follows:
Freq: Be consistent with the frequency to be tested.
STD IB 511(153)
Step 4 Click the “Transmit On” button.
Step 5 View all tested items on the Aeroflex 3920 and make sure they satisfy the following requirements.
Fr
equenc
Transmit Power: 2.5±0.2 W
FSK Error≤5%
Magnitude Error≤1%
y Error≤100 Hz
Receiving
Step 1 Open the Tuner software and go to “TEST -> RX -> Receiver BER (0.153)”.
Step 2 Select the frequency to be tested.
Step 3 Set the Aeroflex 3920 parameters as follows:
Freq: Be consistent with the frequency to be tested.
STD IB 511(.153)
Lvl: -116.0 dBm
Step 4 Click the “Start” button.
The average error rate is less than or equal to 5%.
Page 43
9. PCB View
Main Board_Top Layer
35
Page 44
Main Board_Bottom Layer
36
Page 45
Ua (400‐440 MHz)
Block Diagram
37
Audio Codec
TLV3204
OMAP132
E
M
I
F
S
E
M
I
F
F
CLK
FLASH
BB Processor
SCT3928
MCU
STM32F100VD
SPI
McBSP2
McBSP1
MPUIO/
GPIOs
SPI
IIS
USB
SPI3
GPIOs
Mic
preamp
Audio
preamp
MCLK
19.2MHz
FGU
module
RF
Control
RF Unit
MCSI1
HPI
CS3
GPIOs
MCLK
12.0MHz
XTAL
UART3
UART2
I2C1
GPIOs
JTAG
AUDIO
AMP
I2C
LCD
HPI
HPI
IIS
SPI2
Security
Key
UART1
Key Board
GPIOs
MCLK
I2C
I2C
IIS
TX
module
RX
module
Tx/Rx
Switch
ANT
AF_IN
MOD_REF
MOD_VCO
10. Block Diagram
10.1 General Radio Diagram
Page 46
Block Diagram
Ua (400‐440 MHz)
38
Match
Tx/Rx
Switch
Harmonic
Filter
A
N
T
APC/TV1
SKY72310
CLK
CS
DATA
LD
Tuning
Filter2
IF Filter
LPF
BA4116
AFDET
LOIN
IFIN
Match
LPF
VCTCXO
19.2MHz
T/R
Buffer
2SC5108
Driver
2SC3356
Current
sensor
MOD_VCO
Bais_Dow
n _Circuit
BIAS_DOWN
TX_En
V_BAT
APC_circuit
3V_FGU
Active
Filter
3V0A_FGU_PLL
PLL_CLK
PLL_STB
PLL_DATA
PLL_LD
RX VCO
TX VCO
LNA
AT41511
IF AMP
2SC5108
LPF
3VFGU
LPF
Tuning
Filter1
Attenuator
Protect
RB706F
38.85MHZ
RFM03U3CT
HSMS-2827
Double Circuit
2SC5108
38.4MHz
MOD_REF
SQL
RSSI
BAT
PreDriver 2
Match
PreDriver 1
2SK3078
2SC3356
SW-CHARGE-FGU
PRE_FlOCK
FL_FLOCK
450KHZ-G
IF Filter
AFDET
SQL
RSSI
BFQ540
Match
Balun
Balun
VCO_L/H_En
3V_TX_RF
3V_TX_RF
3V_TX_RF
3V_RX_RF
DTA114YE
3V_RX_RF
3V_RX_RF
3V_RX_RF
2SC3356
3V_RX_RF
EM6M2
VCO_L/H_En
RX_TX_LO
3V0_FGU_PER
RX_LO_AMP
3V7_PA
RFM03U3CT
10.2 RF Circuit
Page 47
Ua (400‐440 MHz)
Block Diagram
39
CODEC
TLV320AIC3204
STM32F101VET6
AMP
MAX9716EUA
MCLK
BCLK
WCLK
DIN
DOUT
MCLK
VDD3V3
12.288MHZ
SCL
SDA
Security Key
I2S
HPI
VOICE
CODER
Protoccol
Stack
4FSK
FM
Demod
Channel
Selection
SCT3928
S0CLK
S0FS
S0DO
S0DI
S1CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_CLK
FLASH_CE
FLASH_DI
FLASH_DO
MCU
PLL_CLK
PLL_STB
PLL_DATA
PLL_LD
MOD_VCO
MOD_REF
AFDET
SQL
RSSI
BAT_DET
APC/TV
ADJ_CRY
Volume
adjust
BEEP
3V0A
BAT
T/R
SW-CVread
BIAS_DOWN
RSSI
PTT
12MHZ
OPT_SEL
R/G
RESET
3V3D
W/N
EEPROM
24FC512-I/SM
I2C
3V3D
3V0D
1V2
LOR
LOL
IN3R
IN1L
HPL
IN2L
AF_MUTE
AF_MUTE
USART port
VOX
VOX
EXT_interface
ext_mic
ext_spk
V_CHARGER
LCD
LCD_RSTB
LCD_CSB
LCD_SDA
LCD_SCLK
A0
10.3 Baseband Circuit
Page 48
Block Diagram
Ua (400‐440 MHz)
40
3 VRT
U301
LDO
RP102N 301B
PWR- KEY_ DET
To PLL
SCT3928
PWR_ON
POWER_ON
U302
LDO
RP102N 301B
U307
LDO
RP102N 301B
DTC114YE
U310
DC-DC
TPS62561DDCR
3V0A
3V0D
A
3V0
U308
LDO
RP102N 301B
POWER_ON
POWER_ON
POWER_ON
POWER_ON
PWR_STC3V
U306
LDO
RP102N 301B
EM6M2
VDD_OP
To APC
To autio PA
To RF PA
To APC REF
VBAT
TP609
U608
CHARGER
MC 34673
CHG
VBUS
PPP
After inserted the charger, wake
up the walky- talky
Read charger status
Detect charger inserted
EM6M2
EM6M2
3V_TX_ RF
3V_ RX_RF
TEM-LEV- DET-TC
TX_EN
RX_EN
To SCT 3928 ,U203( Security Key),crystal, Codec
To LED
To SCT3928
To_ EEPROM
To MCU
To Codec LDOIN
RESET
To Mic amp
RESET
R 3112Q271A
POWER_ KEY-
POWER_ KEY-
To keypad( hardware connectted)
DC2DC_ CTRL
To VCO
To FAST LOCK
VCC_VC_ TCXO
3V0_ FGU_PER
VCC_CP
DTC114YE
CHG_ CURRENT
ISET
U309
XC6118N28
AMR-G
3V FGU
U304
LDO
RP102Z301D
1V2D
To LCD
VCO buffer and amp.
POWER_ON
TX_EN
LED_LCD_BL
10.4 Power Supply Circuit
Page 49
Ua (400‐440 MHz)
Block Diagram
41
RX_VCO
PLL Sky72310
Buffer
AmpT/R_Switch
RF feedback LPF
TX_VCO
Mod_1
Loop Filter
VC_TXCO
Mod_2
PN: ≤-80 (dBc/Hz)@1KHz
PN: ≤-112 (dBc/Hz)@12.5KHz
PN: ≤-120 (dBc/Hz)@25KHz
PN: ≤-136 (dBc/Hz)@100KHz
PN: ≤-145 (dBc/Hz)@1MHz
Two Point modulation:
0.1~5KHz modulate
ripple≤±0.5dB
Fc=19.2MHz
To TX
To Mixer
2SC5108
Gain≤5dB
isolation≥20dB
Current≤4mA
2SC3356
Gain≥10dB
isolation≥15dB
Current≤10mA
3dB BW≤3.5K
Phase Margin:30-55°
A=0.1Vpp~2.0Vpp
S21=-3dB
Fpass=500MHz
Fstop=800MHz
Astop=40dB
Kv≤30MHz/V
CV=0.8~2.3V
F=361.15~401.15MHz
PN≤-116dBc/Hz@12.5KHz
Kv≤30MHz/V
CV=0.8~2.3V
F=400~440MHz
PN≤-116dBc/Hz@12.5KHz
3.0v for core&Vp
Compare frequence:4.8MHz
Prescaler Level:50~250mVpp
6.1 Control Circuit ................................................................................................................................. 22
6.1.1 No display upon power-on or abnormal display ................................................................... 22
6.1.2 No voice output by speaker .................................................................................................. 23
6.1.3 No modulation signal in transmission .................................................................................. 24
12. Parts List ........................................................................................................................................... 54
Page 76
Uc (430‐470 MHz)
Product Controls
1
1. Product Controls
No. Part Name No. Part Name
1 PTT (Push-to-Talk) Key
○
2 SK1 (Side Key 1)
○
3 Antenna
○
4 Speaker
○
5 LCD Display
○
6 OK/Menu Key
○
7 Up Key
○
8 Volume -/Left Key
○
9 Call Key
○
13 LED Indicator
○
14 Microphone
○
15 Cancel/Return Key
○
16 Volume +/Right Key
○
17 Power On/Off/ESC Key
○
18 P3 Key
○
19 Down Key
○
20 Charging/Data Connector
○
21 Earpiece Connector
○
Page 77
Product Controls
Uc (430‐470 MHz)
2
No. Part Name No. Part Name
10 P1 Key
○
11 P2 Key
○
12 Strap Hole / /
○
22 Battery Cover Open-up
○
23 Battery Cover
○
Page 78
Uc (430‐470 MHz)
Disassembly and Assembly
3
2. Disassembly and Assembly
This section is designed to introduce the way to disassemble the radio. To assemble the radio, do vice
versa.
Caution
Please position the waterproof ring properly during reassembly.
Use the thumb and index finger to move the silicon rubber of SK1 key until SK1 key is well
assembled.
Step 1 To remove the battery, do as follows.
Step 2 Remove the chassis.
Remove the four T6 screws and take out the chassis.
Page 79
Disassembly and Assembly
Uc (430‐470 MHz)
4
Step 3 Remove the main board.
1. First unplug the speaker connector and Keypad FPC connector, and then remove the one
T6 screw.
2. Take out the main board in the direction shown in the figure below.
Step 4 Remove the keypad board.
3. Remove the two screws on the back.
Page 80
Uc (430‐470 MHz)
Disassembly and Assembly
5
4. Remove the keypad board.
Step 5 Remove the LCD display.
5. Straighten the two fixing plates securing the LCD display. See the figure below.
6. Take out the LCD display vertically.
Page 81
Disassembly and Assembly
Uc (430‐470 MHz)
6
Step 6 Remove the aluminum chassis shielding cover.
7. Remove the three screws securing the aluminum chassis shielding cover.
8. Take out the aluminum chassis shielding cover.
Page 82
Uc (430‐470 MHz)
Exploded View and Packaging Guide
7
1
7500801000000
PORON
6002127000000
3
7500512000000
Motor PORON pad
7500809000000
Conductive sponge for aluminum
chassis
5
7400656000000
Earpiece PC sheet
1 30
6002126000000
Front case
1 6 /
PCB main board
1 31
7500717000000
Motor PORON
1 7 7500724000000
LCD PORON pad
1 32
6002128000000
Antenna cover
1
7102002500000
Transparent silicon rubber
light guide
7500376000010
Conductive sponge for earpiece
FPC
10
6203684000000
Decoration sheet (right side)
1 35
5001000000090
Speaker
1
Insulative PORON for
speaker
3. Exploded View and Packaging Guide
3.1 Exploded View
Parts list:
No. Part No.DescriptionQty.
2
4
8
9
11 / Model PC label 18x7mm1 36 7500784000000
No. Part No.DescriptionQty.
2 26 7400628000000 Speaker felt1
Chassis1 27 6002144000000
1 28 6002113000000 Earpiece connector cover1
1 29 6002124000000
Machine screw M2.0x2.5mm 2 33 6101008000000
1 34 4200040000300
Stopper for earpiece
connector cover
Micro USB cover1
Power Cord1
2
1
1
Page 83
Exploded View and Packaging Guide
Uc (430‐470 MHz)
8
12
6203683000000
Decoration sheet (bottom side)
1 37 / Antenna core
1
7500305000000
Silicon rubber pad for battery
connector
7600052000000
7500749000000
16 / Semi-finished keypad board
1 41
7400329000000
MIC pad
1
17
7300122000000
Metal dome for functional key
1 42
5002270000030
Microphone
1
7500748000000
Aluminum chassis shielding
cover
19
6101009000000
P&R keypad
1 44
6101018100000
Silicon rubber pad for battery
4
6002125000000
Silicone rubber plug for RF
test port
21
6203685000000
Decoration sheet (left side)
1 46
6101023100000
Main waterproof ring
1
22
6002110000000
PTT key cover
1 47
6101022100000
Waterproof ring for battery
1
23
6101052100000
PTT key (silicone rubber)
1 48
6002129000000
Battery Cover
1
6203682000000
7500756000000
No. Part No.DescriptionQty.
13
14
15
18
20
24
25
PORON pad for connector1 38 6101083100000
Conductive sponge for front case1 39 7101904020200
Double-sided adhesive tape for
keypad FPC
Double-sided adhesive tape for
LCD lens
LCD lens1 45 6101059100000
Speaker steel felt1 49 /
Double-sided adhesive tape for
speaker steel felt
No. Part No.DescriptionQty.
1 40 7400141000000
1 43 6300253000000
1 50 6002132000000
Note
Parts that are not marked with Part Number may vary with the frequency band.
Self-tapping Screw
ST1.9x4.0mm
NSM08Z01 MIC felt1
PC label with LOGO
19.7x4.8mm
BC21 belt clip1
1
3
1
1
1
Page 84
Uc (430‐470 MHz)
Exploded View and Packaging Guide
9
3.2 Packaging Guide
Page 85
Specifications
Uc (430‐470 MHz)
10
Battery Life (5-5-90 Duty Cycle,
Battery
Dimensions (H×W×D)
(with standard battery, without
antenna)
Weight (with antenna &
standard battery)
4. Specifications
General
Frequency Range
430‐470 MHz
Channel Capacity 256
Channel Spacing 25 kHz/12.5 kHz
Rated voltage: 3.7 V
Operating Voltage
Extreme voltage: 3.15–4.2V
Battery 2000 mAh Li-Ion battery
High TX Power)
Analog: 10 hours
High-capacity 2000mAh Li-Ion
Digital: 12 hours
Operating Temperature
°
C to +60°C
-30
106 mm × 57 mm × 23 mm
About 180 g
Frequency Stability ±0.5 ppm
Analog
0.28 μV (12 dB SINAD)
Sensitivity
0.22 μV (Typical) (12 dB SINAD)
0.22 μV (20 dB SINAD)
Digital: -116 dBm/BER5%
TIA-603: 60 dB@12.5 kHz/70 dB@2
Adjacent Channel Selectivity
ETSI: 60 dB@12.5 kHz/70 dB@25 kHz
TIA-603: 70 dB@12.5/25 k
Intermodulation
ETSI: 65
TIA-603: 70 dB@12.5/25 kHz
Spurious Response Rejection
ETSI: 70 dB@12.5/25kHz
Receiver
dB@12.5/25 kH
5 kHz
Hz
z
Blocking 84 dB
Page 86
Uc (430‐470 MHz)
Specifications
11
Rated Audio Power Output 0.4 W (8 Ω load)
Rated Audio Distortion ≤5%
Transmitter
Power Output 3 W/1.5 W
Conducted/Radiated Emission
Modulation Limiting
FM Noise
Audio Distortion ≤3%
-36 dBm<1 GHz
-30 dBm>1 GHz
±2.5 kHz@12.5 kHz
±5.0 kHz@25 kHz
40 dB@12.5 kHz
45
dB@25 kHz
Note
All Specifications are tested according to applicable standards, and subject to change without notice
due to continuous development.
Page 87
Circuit Description
Uc (430‐470 MHz)
12
CODEC
TLV320AIC3204
STM32F101VET6
AMP
MAX9716EUA
MCLK
BCLK
WCLK
DIN
DOUT
MCLK
VDD3V3
12.288MHZ
SCL
SDA
Security Key
I2S
HPI
VOICE
CODER
Protoccol
Stack
4FSK
FM
Demod
Channel
Selection
SCT3928
S0CLK
S0FS
S0DO
S0DI
S1CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_CLK
FLASH_CE
FLASH_DI
FLASH_DO
MCU
PLL_CLK
PLL_STB
PLL_DATA
PLL_LD
MOD_VCO
MOD_REF
AFDET
SQL
RSSI
BAT_DET
APC/TV
ADJ_CRY
Volume
adjust
BEEP
3V0A
BAT
T/R
SW-CVread
BIAS_DOWN
RSSI
PTT
12MHZ
OPT_SEL
R/G
RESET
3V3D
W/N
EEPROM
24FC512-I/SM
I2C
3V3D
3V0D
1V2
LOR
LOL
IN3R
IN1L
HPL
IN2L
AF_MUTE
AF_MUTE
USART port
VOX
VOX
EXT_interface
ext_mic
ext_spk
V_CHARGER
LCD
LCD_RSTB
LCD_CSB
LCD_SDA
LCD_SCLK
A0
5. Circuit Description
5.1 Baseband6HFWLRQ
5.1.1 Power Supply Module
Diagram of Power Control
The power supply employs a single 3.7V li-ion battery. The RF section uses LDO to regulate WKHYROWDJHWR 3V
for FGU and PLL circuits and the control parts of RX and TX circuits. The BB secti
to regulate
C to convert the voltage to 1.2V.
DC/D
WKHYROWDJHWR 3V for Codec, MC
U and SCT3928. The core power supply of SCT3928 uses
on uses ORZGURSRXW/'2
Page 88
Uc (430‐470 MHz)
Circuit Description
13
3 VRT
U301
LDO
RP102N 301B
PWR- KEY_ DET
To PLL
SCT3928
PWR_ON
POWER_ON
U302
LDO
RP102N 301B
U307
LDO
RP102N 301B
DTC114YE
U310
DC-DC
TPS62561DDCR
3V0A
3V0D
A
3V0
U308
LDO
RP102N 301B
POWER_ON
POWER_ON
POWER_ON
POWER_ON
PWR_STC3V
U306
LDO
RP102N 301B
EM6M2
VDD_OP
To APC
To autio PA
To RF PA
To APC REF
VBAT
TP609
U608
CHARGER
MC 34673
CHG
VBUS
PPP
After inserted the charger, wake
up the walky- talky
Read charger status
Detect charger inserted
EM6M2
EM6M2
3V_TX_ RF
3V_ RX_RF
TEM-LEV- DET-TC
TX_EN
RX_EN
To SCT 3928 ,U203( Security Key),crystal, Codec
To LED
To SCT3928
To_ EEPROM
To MCU
To Codec LDOIN
RESET
To Mic amp
RESET
R 3112Q271A
POWER_ KEY-
POWER_ KEY-
To keypad( hardware connectted)
DC2DC_ CTRL
To VCO
To FAST LOCK
VCC_VC_ TCXO
3V0_ FGU_PER
VCC_CP
DTC114YE
CHG_ CURRENT
ISET
U309
XC6118N28
AMR-G
3V FGU
U304
LDO
RP102Z301D
1V2D
To LCD
VCO buffer and amp.
POWER_ON
TX_EN
LED_LCD_BL
Powering On/ Off
Page 89
Circuit Description
Uc (430‐470 MHz)
14
When \RXlong press the Pow
the radio p
level.
During power-off, POWER_KEY- is at low level, while PWR-KEY_DET is at high level. The system
detects power-off procedure via PWR-KEY_DET and implements the power-off procedure. Then
PWR_ON and POWER_ON go to low level, and the power is cut off.
owers RQ. After power-on, PW
er On-Off/ESC key, POWER_KEY- and POWER_ON are at high level, and
R_ON goes to high level, and PWR-KEY_DET goes to low
Page 90
Uc (430‐470 MHz)
Circuit Description
15
STM32F101 VET6
VDD3V3
12.288 MHZ
HPI
VOICE
CODER
Protoccol
Stack
4 FSK
FM
Demod
Channel
Selection
SCT3928
S0 CLK
S0FS
S0DO
S0DI
S1 CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_ CLK
FLASH_CE
FLASH_DI
FLASH_DO
MCU
PLL_CLK
PLL_STB
PLL_ DATA
PLL_LD
SQL
RSSI
BAT_DET
APC/TV
ADJ_CRY
Volume
adjust
T/R
SW-CVread
BIAS_DOWN
RSSI
PTT
12MHZ
OPT_SEL
R/G
RESET
3V3D
W/N
EEPROM
24FC512-I/ SM
I2C
3V3D
3V0D
1V2
AF_ MUTE
USART port
VOX
EXT_ interface
ext_mic
ext_spk
V_ CHARGER
LCD
LCD_RSTB
LCD_CSB
LCD_SDA
LCD_SCLK
A0
5.1.2 Control Module
Page 91
Circuit Description
Uc (430‐470 MHz)
16
SCT3928
RESET IC
RESET
RSTN
CODEC
MCU
Codec_RESET
LCD
LCD_RSTB
CODEC
TLV320AIC3204
AMP
MAX9716EUA
MCLK
BCLK
WCLK
DIN
DOUT
MCLK
VDD3V3
12.288MHZ
SCL
SDA
Security Key
I2S
VOICE
CODER
Protoccol
Stack
4FSK
FM
Demod
Channel
Selection
SCT3928
S0CLK
S0FS
S0DO
S0DI
S1CLK
S1FS
S1DO
S1DI
CLKIN
SCL
SDA
FLASH_CLK
FLASH_CE
FLASH_DI
FLASH_DO
MOD_VCO
MOD_REF
AFDET
BEEP
3V0A
BAT
3V0D
1V2
LOR
LOL/R
IN3R
IN1L
HPL/R
IN2L
AF_MUTE
VOX
These two signals go to FGU
for modulation
This signal is output via BA4116
after RX down conversion
The radio uses STM32F101VET6(MCU) and SCT3928(Baseband IC). STM32F101VET6 is the main
controller unit, while SCT3928 is the baseband processor chip, which is used for analog and digital
modulation/demodulation and digital voice encoding/decoding. MCU communicates with SCT3928 via
HPI BUS, connects to 512K EEPROM via I2C BUS and controls the LCD display via SPI BUS.
STM32F101VET6 uses the 12MHz crystal oscillator as the clock signal while SCT3928 uses the
12.288MHz crystal oscillator as the clock signal.
Reset Signal
5.1.3 Audio Module
Audio Diagram
The audio processing section uses SCT3928 and TLV320AIC3204. The audio amplifier uses
MAX9716EUA. The diagram is as follows:
The audio module is mainly composed of:
RX path
The signal demodulated by RF module is sent to the input port of third path of TLV320AIC3204 for
amplifying. After DQDORJWRGLJLWDO$' conversion, the signal is sent to SCT3928 via I2S interface for
internal processing. Then the signal is sent to TLV320AIC3204 via I2S interface for GLJLWDOWRDQDORJ'$
conversion and amplifying.
Page 92
Uc (430‐470 MHz)
Circuit Description
17
Rated Power (Po)
0.4W
R L =8Ω
Maximum Power (P
)
0.8W
R L =8Ω
)LQDOO\the audio signal is output to audio amplifier MAX9716EUA for amplifying via the HPL/R port of
TLV320AIC3204 to drive the speaker.
TX path
The audio signal UHFHLYed by the MIC is divided into two paths: one path i
for VO
the signal is sent to SCT3928 via I2S interface for internal processing. Then the signal is sent to
TLV320AIC3204 via I2S interface for DA conversion and amplifying. Finally, the audio signal is output to
FGU for two-path modulation via the LOL/R port of TLV320AIC3204.
External Connector
X sampling; the other path is sent to TLV320AIC3204 for AGC amplifying. After AD conversion,
Earpiece connector: Ф2.5mm standard earpiece connector for specific earpiece.
USB port: It is used for battery charging and programming.
s processed and sent to MCU
Audio Amplifier
Main parameters of MAX9716EUA are listed in the table below:
Frequency: 38.4MHz
Current Drain≤ 2mA
output level≤ -22dBm
Pi Attenuator
Lo input level≥7dBm
IL:0.5dB
Zin/Zout:50R
Attenuator Protect
RB706F
3Vdc
Double Circuit
2SC5108
3VFGU
VCTCXO
19.2MHz
BA4116FV
AF OUT
5.2.2 Receiver Circuit
The receiver circuit mainly comprises the RF band-pass filter, low-noise amplifier, mixer, IF filter, IF
amplifier and IF processor.
Receiver Front-end
The HF signal from the low-pass filter passes through the electrically tunable first-stage band-pass filter
controlled via APC/TV1 level, to remove out-of-band interference signal and to send wanted band-pass
signal to the low-noise amplifier (Q6005). The amplified signal goes to a second-stage band-pass filter
which is also controlled via APC/TV1 level, to remove out-of-band interference signal generated during
amplification, and to send GHVLUHG HF signal to the mixer.
ThLV+) signal passes through the RF band-pass
(D6009)
. Meanwhile, the first local oscillator (LO) signal generated by VCO passes through the low-pass
filter and also goes to the mixer (D6009). In the mixer, the +) signal and the first LO signal are
mixed to generate the first IF signal (38.85MHz). Then the ,)signal passes through the frequency selection
network composed of LC, to suppress carriers other than the first IF signal, and to increase the isolation
between the mixer and the IF filter. After that, the first IF signal is processed by the crystal filter (Z6001),
and is sent to the IF amplifier circuit (Q6006) for amplification. Then the amplified signal goes to the IF
processor BA4116FV for processing.
filter and low-noise amplifier and goes to the mixer
Page 95
Circuit Description
Uc (430‐470 MHz)
20
Receiver Back-end
The processed first IF signal is sent to IC BA4116 for second mixing (the second harmonic of the PLL
crystal will be selected as the second LO signal, which will be mixed and converted to the 450 kHz
second IF signal) and will go through the 450 kHz ceramic filter to filter out the spurious signal before the
second IF signal is amplified and frequency discriminated. Then the first IF signal will be processed
internally and demodulated. Finally, the demodulated signals will be sent to the baseband section for
audio processing.
5.2.3 Frequency Generation Unit (FGU)
The FGU, composed of VCO and PLL, is the core module of the whole TX-RX system. This unit
provides accurate carrier frequency during transmission, and stable LO signal during receipt. It has a
direct influence on the performance of the system.
Page 96
Uc (430‐470 MHz)
Circuit Description
21
RX_VCO
PLL Sky72310
Buffer
AmpT/R_Switch
RF feedback LPF
TX_VCO
Mod_1
Loop Filter
VC_TXCO
Mod_2
PN: ≤-80 (dBc/Hz)@1KHz
PN: ≤-112 (dBc/Hz)@12.5KHz
PN: ≤-120 (dBc/Hz)@25KHz
PN: ≤-136 (dBc/Hz)@100KHz
PN: ≤-145 (dBc/Hz)@1MHz
Two Point modulation:
0.1~5KHz modulate
ripple≤±0.5dB
Fc=19.2MHz
To TX
To Mixer
2SC5108
Gain≤5dB
isolation≥20dB
Current≤4mA
2SC3356
Gain≥10dB
isolation≥15dB
Current≤10mA
3dB BW≤3.5K
Phase Margin:30-55°
A=0.1Vpp~2.0Vpp
S21=-3dB
Fpass=500MHz
Fstop=800MHz
Astop=40dB
Kv≤30MHz/V
CV=0.8~2.3V
F=361.15~401.15MHz
PN≤-116dBc/Hz@12.5KHz
Kv≤30MHz/V
CV=0.8~2.3V
F=400~440MHz
PN≤-116dBc/Hz@12.5KHz
3.0v for core&Vp
Compare frequence:4.8MHz
Prescaler Level:50~250mVpp