7
Narrow band RX control. H:effective in narrow
band
RX indicator control. H
：
Light
TX indicator control. H
：
Light
NC
NC
Audio power amplifier control. L: power
amplifier working
AK2346 data input/output clock
Channel encoding input (channel selection)
Channel encoding input (channel selection)
Channel encoding input (channel selection)
Channel encoding input (channel selection)
NC
NC
NC
CTCSS/DCS input
RX field strength signal input
Battery voltage check input
VOX voltage check input
GND
Squelch voltage check input
5V voltage input
5V voltage input
AK2346 data input/output control pin
TX power adjustment voltage input control
switch. H
：
Control is effective
TX power output control. L: TX power output
enabling
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
NCON
LEDR
LEDG
NC
NC
AFCO
AFSCK
EN4
EN3
EN2
EN1
NC
NC
NC
TI
RSSI
BATT
VOX
GND
SQL
VCC
VCC
AFDIR
APCSW
DCSW
I
O
O
I
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
O
O
O
Position
IC301
IC101
Ic204
IC408
IC402
IC401
Ic9
IC10
IC505
Q101
Q102
Q304
Q111
Q306
Q205
Q10
Q104
Q103
Q107
Q21
Q26
Q204
Q507
Q06
Type
MB15E03SL
NJM2904
Ta31136
AK2346
TC75W51FU
TDA2822D
AT2432NI
M30620FCPFP
R3111N45IC
2SC5108
2SC3356
2SC5108
2SC5108
2SC4617
2SC2412K
2SC1623
RD07MVS1
RD01MUS1
DTA144EE
3SK318
3SK318
2SC5108
DTC144EE
DTC144EE
Function Description
Frequency synthesizer
APC, voltage comparison, drive
Receiver's 2nd local oscillation, 2nd IF
a m p l i f i c a t i o n , a m p l i t u d e l i m i t ,
demodulation, noise amplification
Audio processing
MIC amplification
Receiver audio power amplifier
2
E PROM, memory channel frequency
data, function setting parameter,
debugging state parameters
MCU
MCU reset circuit
Transmitter 1st amplification
Transmitter 2nd amplification
VCO buffering amplifier
VCO buffering amplifier
VCO power filter
Noise amplifier
5V regulated output current stretcher
Transmitter final power amplifier
Transmitter power amplifier drive
APC output switch
The 1st frequency mixer
Receiver HF amplifier
The 1st IF amplifier
Red LED drive
Green LED drive
Table 3.5 Diode Function Description
Position
D102
D101
D103
D104
D201
D302
D304
D305
D310
D308
ZD101
D311
D306
D299
D508
D509
D505
D506
Type
MA77
HSC277
HSC277
HSC277
HSC277
MA2S376
MA2S376
MA360
MA2S376
MA2S376
HZU5ALL
MA2S111
MA2S111
1N4148
LED Red
LED Green
LED Red
LED Green
Function Description
Transmitter antenna switch diode
VCO output switch
Antenna switch
Antenna switch
VCO output switch
VCO oscillation variable capacitance diode
VCO oscillation variable capacitance diode
VCO modulation diode
VCO oscillation variable capacitance diode
VCO oscillation variable capacitance diode
APC output voltage-limiting diode
Loss of lock check diode
VCO power filtering accelerating diode
Noise demodulation
Transmitting indication
Receiving Indication
Transmitting indication
Receiving Indication
Table3.6
：
XF 203 Crystal Filter Features
Item
Nominal center frequency
Transmission bandwidth
40dB barrage bandwidth
Pulse
Insertion loss
Guarantee attenuation
Terminal resistance
Specified Value
51
．
65MHz
±
7.5kHz or bigger, within 3dB
±
20.0kHz or smaller
1.0dB or smaller
3.0dB or smaller
80dB or bigger, within fo-910kHz
1.5k
Ω
/6PF
Table 3.7 CF201 LTWC450F Features
Item
Nominal center frequency
6Db bandwidth
50dB bandwidth
Pulse
Insertion loss
Guarantee attenuation
Specified Value
450kHz
±
5.0kHz or bigger
±
13.5kHz or smaller
3.0dB or smaller z
7.0dB or smaller
45.0dB or bigger, f0
±
100kHz
Table 3.8 CF202 LTWC450G Features
Item
Nominal center frequency
6Db bandwidth
50dB bandwidth
Pulse
Insertion loss
Guarantee attenuation
Specified Value
450kHz
±
3.5kHz or bigger
±
12kHz or smaller
3.0dB or smaller
7.0dB or smaller
45.0dB or bigger, f0
±
100kHz
3.4 Semiconductor Function Description
Q503
Q502
Q504
Q405
Q404
2SJ243
2SA1745
2SJ243
DTC144EE
2SK1824
C5V switch
T5V witch
R5V switch
Receiver audio output switch
，
cut off
when in emergency mode.
Receiver audio output switch.
PT5200 SERVICE MANUAL
