Ajetrays AJ447 User manual

S
SE ER RV VI IC CE E M MA AN NU UA AL L
AJETRAYS
MODEL AJ447

PAGE 1 ,TOTAL15 PAGES
SPECIFICATION
GENERAL
FREQUENCY RANGE………………………………………….. 400-470MHz
CHANNEL NUMBER…………………………………………… 16
CHANNEL STEP………………………………………………… 25kHz
FREQUENCY GENERAL……………………………………….. SYNTHESIZER (PLL)
MODULATION TYPE…………………………………………… FM (F3E)
DIMENSION……………………………………………………… 107(H)×53(W)×29.5(D)mm
WEIGHT (WITH BATTERY&BATTERY)……………………….. Approx. 215g
RECEIVER
SENSITIVITY…………………………………………………….. < 0.30μVat 12dB SINAD
SELECTIVITY……………………………………………………. 65dB
SPURIOUS RESPONSE………………………………………….. 65dB
DISTORTION…………………………………………………….. LESS THAN 5%
AUDIO OUPUT POWER…………………………………………500mW at 8Ω
TRANSMITTER
POWER OUTPUT………………………………………………… 4W
FREQUENCY STABILITY………………………………………. ±2.5ppm (-20ºC ~ +60ºC)
HARMONIC AND SPURIOS EMMISION……………………… 60dB
FREQUENCY DEVIATION……………………………………… NOT MORE THAN ±5.0kHz
AUDIO DISTORTION……………………………………………. LESS THAN 5%

MAIN PC BOARD(TOP VIEW)
PAGE 2,TOTAL 16 PAGES

MAIN PC BOARD CIRCUIT(TOP VIEW)
PAGE 3 ,TOTAL16 PAGES

PAGE 4,TOTAL 16 PAGES
MAIN PC BOARD(BOTTOM VIEW)

AGE 5 ,TOTAL16 PAGES
MAIN PC BOARD CIRCUIT(BOTTOM VIEW)

PAGE 6,TOTAL 16 PAGES
ADJUSTMENT INSTRUMENT LIST
INSTRUMENT SPECIFICATION
Standard Signal
Generator
Frequency Range: 1 ~ 500MHz
Output Level: 0.1uV ~ 50mV
Digital Voltmeter Measuring Range: 1mV ~ 15V
Distortion Meter Measuring Range: 0.1 ~ 20%
Frequency Counter Frequency Range: 1 ~ 500MHz
Accuracy: ±1ppm or Better
Sensitivity: 100mV or Better
Oscilloscope Frequency Range: DC ~ 20MHz
Measuring Range: 0.01 ~ 15V
RF Power Meter Measuring Range: 0.1 ~ 10W
Frequency Range: 1 ~ 500MHz
Impedance: 50ohm
Stabilized Power Supply Output Voltage: 0 ~ 15V DC
Output Current: 3A or more
External Load Connection Type: 3.5Φmono
Impedance: 8ohm/2W
FM Modulation Analyzer Frequency Range: 20Hz ~ 5kHz
Measuring Range: 0 ~ ±10kHz
Audio Signal Generator Frequency Range: 20Hz ~ 3kHz
Output Level: 1mV ~ 1V

PAGE 7,TOTAL 16 PAGES
ADJUSTMENT PROCEDURES
TRANSMITTER SECTION
Item Condition Measurement Adjustment Specifications/
Test Equipment Terminal Parts Method Remarks
1. Transmit 1) CH: TX Lo RF Power Meter ANT SOFTWARE Adjust it to 4W
Power PTT: ON Ammeter PROGRAM Check
2. Transmit 1) CH: TX Center Frequency ANT SOFTWARE Adjust to ±500Hz
Frequency PTT: ON Counter PROGRAM or less
3. Modulation 1) CH: TX Center Modulation ANT SOFTWARE Adjust to ±2.5kHz
Analyzer PROGRAM
Oscilloscope MIC
Audio Signal
Generator
4.CDCSS
Balance
Adjust
CH: TX Center
PTT: ON
Modulation
Analyzer
Oscilloscope
ANT
SOFTWARE
PROGARM
Make the
Demodulation wave
into square waves
RECEIVER SECTION
Item Condition Measurement Adjustment Specifications/
Test Equipment Terminal Parts Method Remarks
1) CH: RX Center Oscilloscope ANT SOFTWARE Adjust to just turn
1. Squelch MONI: ON Distortion meter SPK PROGRAM on the squelch
1) CH: RX Lo Oscilloscope ANT SOFTWARE Adjust to the min.
2. Sensitivity CH: RX Center Distortion meter SPK PROGRAM Distortion and best SINAD 12dB
CH: RX Hi Signal to noise ratio

PAGE 8,TOTAL 16 PAGES
CIRCUIT DESCRIPTION
1. IC DESCRIPTION
The RDA1846 is a highly integrated single-chip transceiver for Walkie Talkie applications. The
RDA1846 has a powerful digital signal processor, which makes it have optimum voice quality ,flexible
function option ,and robust performance under varying reception conditions.
2. RECEIVER SYSTEM
2-1 Front End (RF AMP)
The signal coming from the antenna passes through the Transmit / Receive switching diode circuit,
passes through a BPF ( L7 and L10), and is amplified by the RF amplifier (Q2). The resulting signal p
goes to RF signal processing IC6 (RDA1846)..
2-2 RF input
Received from the antenna to the RF signal amplified by the LNA(Q2) into IC6 (RF signal processing
IC).RF signals in the chip (IC6) within the amplification, mixing, analog / digital conversion, digital
signal processing (DSP) and analog / digital converter, the output audio signal through the chip PIN
9,enters the microprocessor MCU(IC3).
2-3Receive Signaling(CTCSS/CDCSS)
The output signal from IC6(RDA1846) enters the microprocessor(IC3). IC3 determines whether the
CTCSS or CDCSS matches the preset value, and controls the SP MUTE and the speaker output sounds
according to the squelch results.
2-4 AF Amplifier
The AF signal from the IC is amplified and decoded by MCU (IC3), and the signal passes through AF
VOL circuit and enters the audio power amplifier IC4 (TDA2822) to drive the speaker.
2-5 Squelch
RF signal strength testing done by the IC6. Detecting level values are compared with the default values,
will determine the output to the microprocessor(IC3) to control the audio power amplifier(IC4) is
working. To output sounds from the speaker, microprocessor(IC3) sends a high signal to the MUTE and
turns IC4.
3. TRANSMITTER
3-1 Transmit Audio
The signal from the microphone passes through the IC3. The signal passes through the SOFTWARE
PROGRAM for the maximum deviation adjustment, and goes to the IC6 modulation input.
3-2 CTCSS/CDCSS Encoder
A necessary signal for CTCSS/CDCSS encoding is generated by the IC6, and transmits through RF
circuit.
3-3 RF Amplifier
The RF signal from the IC6 RF Output is amplified by Q12,Q11and Q14 to the sufficient level to drive

PAGE 9,TOTAL 16 PAGES
the power module.
3-4 Final Module
The UHF power transistor RQA0009 is used to amplify the transmission power.
3-5 ANT Switch and LPF
The signal from the power transistor passes through the L2, L3 and L4 LPF and is output from the ANT
terminal. IC3 and PTT are used to switch between transmission and reception.
3-6 Control System
The CPU IC3 operates at 32.768KHz clocks.
3-7 Power Supply
The main of the system control is DC7.4V.

PAGE 10,TOTAL 16 PAGES
BILL OF MATERIAL
MAIN PC BOARD (TOP SIDE)
NO. DESCRIPTION SPECIFICATION REF. NO QUANTITY
1 CHIP C 102P C107,C108,C34,C99 4
2 CHIP C 103P
C48,C49,C50,C51,C52,C53,C56,C57,C58,C59,
C60,C61,C62,C63,C64,C91,C92,C93 18
3 CHIP C 104P C127,C39,C43,C68,C70,C71,C72,C73,C74,C75 10
4 CHIP C 105P C111 1
5 CHIP C 153P C100 1
6 CHIP C 220P C79,C80,C81 3
7 CHIP C 470P C121,C122,C78 3
8 CHIP C NC C106,C126,C65 3
9 CHIP C 106P E9 1
10 CHIP C 475P E13,E2 2
11 CHIP R 0R R32 1
12 CHIP R 0R R96,R97 2
13 CHIP R 100K R27,R5 2
14 CHIP R 100R R33,R62,R65,R89 4
15 CHIP R 10K R25,R26 2
16 CHIP R 10K R31 1
17 CHIP R 10K R36,R66,R94 3
18 CHIP R 150KD R78,R79,R80,R81,R82,R83 6
19 CHIP R 15K R22 1
20 CHIP R 1K R87,R88 2
21 CHIP R 1K5 R91 1
22 CHIP R 1M R74 1
23 CHIP R 220K R38 1
24 CHIP R 22K R64,R99 2
25 CHIP R 2K2 R35 1
26 CHIP R 330R R63 1
27 CHIP R 39K R93 1
28 CHIP R 470R R90 1
29 CHIP R 47K R17 1
30 CHIP R 47K R20 1
31 CHIP R 47K R50,R51,R52,R53 4
32 CHIP R 47K R55 1
33 CHIP R 56K R92 1
34 CHIP R NC R10,R100 2
35 CHIP R NC R67,R8,R85,R86,R98 5
36 FIXED INDUCTOR CH100N L13 1
37 AIR-CORE COIL 7T/1.5/0.4 L1 1
38 TRANSISTOR 2SB624 Q8 1
39 TRANSISTOR DTC114EE Q5,Q6 2

PAGE 11,TOTAL 16 PAGES
BILL OF MATERIAL
MAIN PC BOARD (TOP SIDE)
NO. DESCRIPTION SPECIFICATION REF. NO QUANTITY
40 SPEAKER SPEAKER SP1 1
41 TRIMMING POT. 50K VR1,VR3 2
42 LED GREEN D4 1
43 LED RED D5 1
44 IC 2904 IC7 1

PAGE 12,TOTAL 16 PAGES
BILL OF MATERIAL
MAIN PC BOARD (BOTTOM SIDE)
NO. DESCRIPTION SPECIFICATION REF. NO QUANTITY
1 CHIP C 100P C125,C82 2
2 CHIP C 102P
C101,C102,C103,C104,C105,C109,C2,C31,C3
5,L6 10
3 CHIP C 103P
C11,C26,C3,C44,C45,C46,C47,C54,C55,C87,C
88,C89,C90,C94 14
4 CHIP C 104P
C112,C113,C24,C40,C41,C67,C69,C76 8
5 CHIP C 10P
C117 1
6 CHIP C 150P
C36 1
7 CHIP C 150R
C25 1
8 CHIP C 15P C116 1
9 CHIP C 223P C124 1
10 CHIP C 24P C86,C95,C96 3
11 CHIP C 2P C10,C114,C12,C27,C28,C4,C5 7
12 CHIP C 2P5 C29 1
13 CHIP C 333P C37 1
14 CHIP C 3P C16,C9 2
15 CHIP C 470P C14,C17,C18,C19,C20,C22 6
16 CHIP C 475P C97 1
17 CHIP C 47P C21 1
18 CHIP C 4P C13,C23,C7 3
19 CHIP C 5P C83 1
20 CHIP C 683P C120 1
21 CHIP C 6P C8 1
22 CHIP C 8P C84 1
23 CHIP C NC C1 1
24 CHIP C NC C115,C119,C123 3
25 CHIP C NC C128,C129,C15,C30,C32,C38,C6 7
26 CHIP C NC C85 1
27 CHIP C 106P E11,E4,E5,E6,E7,E8 6
28 TRIMMING POT. 10K VR2 1
29 CHIP R 0R C110,C98,R3 3
30 CHIP R 0R R42,R43,R7 3
31 CHIP R 0R39 R46,R47,R48 3
32 CHIP R 100K R6 1
33 CHIP R 100KF R4 1
34 CHIP R 100R R12 1
35 CHIP R 10K R29,R30 2
36 CHIP R 10K R34 1
37 CHIP R 10R R14,R15,R71,R72,R73 5
38 CHIP R 120K R23 1

PAGE 13,TOTAL 16 PAGES
BILL OF MATERIAL
MAIN PC BOARD (BOTTOM SIDE)
NO. DESCRIPTION SPECIFICATION REF. NO QUANTITY
39 CHIP R 13KF R24 1
40 CHIP R 150R R11 1
41 CHIP R 1K R37,R40,R68,R69 4
42 CHIP R 1K R9 1
43 CHIP R 1K5 R77 1
44 CHIP R 22K R13,R28 2
45 CHIP R 270R R44,R45 2
46 CHIP R 2K2 C42 1
47 CHIP R 2K2 R70 1
48 CHIP R 330R R84 1
49 CHIP R 390K R95 1
50 CHIP R 39K R2,R56 2
51 CHIP R 3K3 R39 1
52 CHIP R 47K R1,R16 2
53 CHIP R 47K R18,R19 2
54 CHIP R 47K R49 1
55 CHIP R 47K R54 1
56 CHIP R 47K R57,R58,R76 3
57 CHIP R 47R R75 1
58 CHIP R 4K7 R41 1
59 CHIP R NC R21,R59,R60,R61 4
60 DIODE BA592 D3 1
61 DIODE HSC277 D1,D2 2
62 FIXED INDUCTOR CH100N L12 1
63 FIXED INDUCTOR CH100N L14,L15 2
64 FIXED INDUCTOR CH18N L24 1
65 FIXED INDUCTOR CH220N L17,L23 2
66 FIXED INDUCTOR CH22N L5,L8 2
67 FIXED INDUCTOR CH2N2 L21 1
68 RESONATOR 26M/KDS X2 1
69 RESONATOR 4MHZ X1 1
70 AIR-CORE COIL 3T/1.5/0.4 L2,L3,L4 3
71 AIR-CORE COIL 4T/1.5/0.4 L7 1
72 AIR-CORE COIL 4T/1.6/0.35 L10 1
73 AIR-CORE COIL 9T/1.2/0.31 L18 1
74 ALU CAP. 100uF/16V E12,E3 2
75 THERMAL R T50K R101 1
76 TRANSISTOR 2SA1362 Q10 1
77 TRANSISTOR 2SB624 Q7 1
78 TRANSISTOR 2SC4226 Q14,Q2 2

PAGE 14,TOTAL 16 PAGES
BILL OF MATERIAL
MAIN PC BOARD (BOTTOM SIDE)
NO. DESCRIPTION SPECIFICATION REF. NO QUANTITY
79 TRANSISTOR 2SK3078 Q12 1
80 TRANSISTOR DTA114EE Q1 1
81 TRANSISTOR DTC114EE Q4 1
82 TRANSISTOR DTC114EE Q9 1
83 TRANSISTOR DTC114TE Q13 1
84 TRANSISTOR NC Q3 1
85 TRANSISTOR RQA0009 Q11 1
86 TAN CAP. 226P/10V
E10 1
87 IC 24C08 IC2 1
88 IC AUDIO-F IC8 1
89 IC FP3002 IC1 1
90 IC MCU IC3 1
91 IC RDA1846 IC6 1
92 IC TDA2822 IC4 1
93 FERRITE CHIP CB100 L22 1
94 FERRITE CHIP CB101 L9 1

12 3 45687
A
B C D
8
7
6
5
4
32
1
D
C B A
R41 4K7
R49 47K
R63 330R
R62 100R
3.3T
3.3R
SQL-AD
RX-P
RX-P
RXLED TXLED
LE1846
SCK1846/SCK24
SCK1846/SCK24
SDA24
AF OUT
E5
106P
E4
106P
R25 10K
SDA24
AR-650SCH3(5W)GZ
Ver1.0
Tom
Jerry
XIN
XOUT
RFIN
SQL-AD
SCK1846/SCK24
LE1846
RST
CTCSS IN
C98 0R
3.3V
C99 102P
C48
103P
R65
100R
R26 10K
3.3V
C104
102P
E9
106P
3.3V
BATT-AD
3.3V
R64 22K
C44 103P
TXD232/AUDIOSDA
C45 103P
C46 103P
MIC AMP
TXD232/AUDIOSDA
C119
NC
C47 103P
C67 104P
3.3V
3.3V
C59 103P
C58 103P
C4 2P
ANT1
L1
7T/1.5/0.4
L2
3T/1.5/0.4
C1 NC
C5 2P
L3
3T/1.5/0.4
C7 4P
C12 2P
L4
3T/1.5/0.4
C8 6P
C23 4P
C14 470P
C13 4P
L7
4T/1.5/0.4
D1 HSC277
D2
HSC277
C95 24P
C96 24P
XIN
XOUT
Q1
DTA114EE
R22 15K
R17 47K
R5 100K
C91 103P
Q8
2SB624
3.3V
RST
D5
RED
L13
CH100N
RDA3V
Q4
DTC114EE
Q7
2SB624
D3 BA592
C82 100P
C83 5P
C17 470P
C84 8P
C30 NC
C87 103P
C86 24P
R42 0R
L17 CH220N
R44 270R
R45 270R
C114 2P
Q11 RQA0009
C94 103P
C18 470P
C40 104P
L18
9T/1.2/0.31
VBATT
E3
100uF/16V
C39
104P
C34 102P
R46 0R39
L22 CB100
VB+
R12 100R
R43 0R
R18 47K
R19 47K
C35 102P C115
NC
C116 15P
C36 150P
L21 CH2N2
Q12
2SK3078
L23 CH220N
C41 104P
R75 47R
R76 47K
R23 120K
R14 10R
R77 1K5
C19 470P
C3 103P
C21 47P
C117 10P
Q14
2SC4226
C85 NC C22
470P
C20
470P
R15 10R
R9 1K
C125
100P
L14 CH100N
L24
CH18N
R84 330R
R73 10R
C109 102P
R95 390K
3.3V
C76 104P
R69 1K
R56 39K
AUDIO
SCKRING/BEEP
TXD232/AUDIOSDA
F
1
SCK
2
SDA
3
VDD
4VSS 5
OSC 6
VOT 7
VDD 8
IC8
AUDIO-F
SCKRING/BEEP
A0 1
A1 2 A2 3
GND 4
SDA
5
SCL
6
WP
7
VCC
8
IC2
24C08
3.3V
L12 CH100N
AVDD 1
SCLK 2
SDIO 3
AVDD 4
XTAL1 5
XTAL26
MODE 7
SENB 8
AFOUT 9
NC 10
Cc 12
AVDD 13
NC 14
RFIN 15
AVDD 16
NC
17
RFOUT
18
NC
19
NC
20
AVDD
21
PABLAS
22
AVDD
23
PDN
24
GPLO7
25
GPLO6
26
GPLO5
27
GPLO4
28
GPLO3
29
GPLO2
30
GPLO1
31
GPLO0
32
MIC_IN 11
GND
33
IC6
RDA1846
R68
1K
C97 475P
C61 103P
C60 103P
RDA3V
R29
10K
R30
10K
R31
10K
RDA3V
C75 104P
C74 104P
C71 104P
C70 104P
C57 103P
C56 103P
C73 104P
C72 104P
C110 0R
D4 GREEN
BATT
BATT
VR1 50K
VDD
1
VDD VSS
VSS INT PC3 PC2
PC1
PC0
PB7 PB6
PB5
PB4
PB3 PB2
PB1 PB0
PA7
PA6
PA5
PA4 PA3 PA2 PA1 PA0
OSC2 OSC1
RST 28
IC3
MCU
C38 NC
R16 47K
3.3V
R21
NC
Q3 NC
R24 13KF R4 100KF
VBATT1
BATT-AD
C105 102P
SW1 PTT
R88 1K
C81 220P
SW2 MONI
1
2
3 4
5
CH1 CTR
MONIKEY
PTT/RXD232
CODE4
R89 100R
R34 10K
C49 103P
C79
220P
R57 47K
C50 103P
C51
103P C52
103P
3.3V
R50 47K
R51 47K
R52 47K
R53 47K
CODE1 CODE2 CODE3
E12 100uF/16V
C68 104P
R71 10R
R87 1K
C80 220P
E8
106P
Q10
2SA1362
R54
47K
E7
106P
C101
102P
C54
103P
VBATT1
R70
2K2 C55
103P
C112 104P
TXD232/AUDIOSDA
POW2822
C78 470P
C69
104P
C102 102P
R28 22K
C103 102P
R72 10R
C113 104P
Q9
DTC114EE
3.3V
C64
103P
JK1 2.5MM JK2 3.5MM
SP1
SPEAKER
MIC MIC
1
1
2
2
3
3
4
455
66
77 88
IC4
TDA2822
C100
153P
R27
100K
R66
10K
AUDIO
SCKRING/BEEP
C53 103P
C111 105P
AF OUT
VBATT1
VBATT
VR2 10K
C93
103P
C92 103P
3.3V
3.3V
R86 NC
C106
NC
L15
CH100N
C42
2K2
C37 333P
C120
683P R6
100K
R90 470R R91 1K5
E13 475P
MIC AMP
SW3 WARN
R58 47K
C63
103P
3.3V
WARNKEY
7
+5
-6
IC7A 2904
1
+3
-2
84
IC7B 2904
3.3T
R8 NC
R10
NC
R92 56K
R55 47K
C107
102P
C108 102P
R35 2K2
R74 1M
C121
470P
E2
475P R38
220K
R93 39K
R94 10k
R36
10K
R78
150KD
R81
150KD
R83
150KD
VB+
R80
150KD
R79
150KD
R82
150KD
VBATT1
3.3T
C122 470P
C62 103P
Q5
DTC114EE
Q6 DTC114EE
C43
104P
IN
1OUT 2
GND
3
IC1 FP3002
VBATT1
E10
226P/10V
C89 103P
E11
106P C90
103P
C88 103P
R59 NC
R60 NC
R61 NC
VBATT1 SEL
POW2822
CODE4
CODE1 CODE2 CODE3
RXLED TXLED
PTT/RXD232
MONIKEY
SEL CTCSS IN
E6
106P
R20 47K
R47 0R39
R48
0R39
WARNKEY
VR
1
GND
2VCC 4
Fout 3
X2
26M/KDS
C123
NC
X1
4MHZ
C124 223P
R67 NC
R33 100R
R32 0R
C9 3P
R2 39K
R1
47K
RFIN
3.3R
C11
103P
C15
NC
C10
2P
C16
3P
Q2 2SC4226
C6
NC
C126
NC
C127
104P
R7 0R
C128 NC
C129
NC
C65
NC
R11
150R
C25
150R
L9 CB101
VR3 50K
R100
NC
R99
22K
R96 0R
R85 NC
R97 0R
R98 NC
R37 1K
R13 22K
C26 103P
C27
2P
C29 2P5
L10
4T/1.6/0.35
R3 0R
L8 CH22N
C28 2P
C31
102P
C24
104P
L5
CH22N
L6
102P
R101 T50K
3.3T
R40 1K
Q13
DTC114TE
C2 102P
R39 3K3
C32
NC
SCHEMATIC DIAGRAM
PAGE 15,TOTAL 16 PAGES