Abell TH308G User manual

ABELL TH-308G VHF Service Manual
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ABELL INDUSTRIES CO. LTD
TH308G
SERVICE MANUAL
V．1.0
Web: www.abell.com.cn
Email: [email protected]
TEL: [phone]
FAX: [phone]
ADD: 2F,14BLDG, Zhongxing
Industries city, NanShan,
Shenzhen, China

ABELL TH-308G VHF Service Manual
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ABELL Industries Co., Ltd
TH-308G VHF SERVICE MANUAL
V1.0
Contents
GENERAL……………………………………………………………………………1
REALIGNMENT……………………………………………………………………..2
DISASSEMBLY FOR REPAIR……………………………………………………..6
CIRCUIT DESCRIPTION……………………………………………………………8
PARTS LIST…………………………………………………………………………11
EXPLODED VIEW…………………………………………………………………..38
PACKING…………………………………………………………………………….39
ADJUSTMENT………………………………………………………………………40
ELECTRONIC CIRCUIT DESCRIPTION
…………………………………………………………………46
SCHEMATIC DIAGRAM……………………………………………………………47
PC BOARD VIEWS…………………………………………………………………55
SPECIFICATIONS …………………………………………………………………. 57

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GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced technicians familiar with similar types
of commercial grade communications equipment. It contains all required service
information for the equipment and is current as of the publication data. Changes which
may occur after publication are covered by either Service Bulletins or Manual Revisions.
These are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment information, the full part identification
number should be included. This applies to all parts: components, kits, or chassis. If the
part number is not known, include the chassis or kit number of which it is a part, and a
sufficient description of the required component for proper identification.
PERSONAL SAFETY
The following precautions are recommended for personal safety：
DO NOT transmit until all RF connectors are verified secure and any open connectors
are properly terminated.
SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an
explosive atmosphere.
This equipment should be serviced by a qualified technician only.
SERVICE
This radio is designed for easy servicing. Refer to the schematic diagrams, printed
circuit board views, and alignment procedures contained within.
Destination Channel Capacity RF power output
A37 16 3.5W
B25 16 3.5W

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REALIGNMENT
1 Mode
MODE FUNCTION
User Mode Use this mode for normal operation
PC Mode
Use this mode, to make various
settings by means of the FPU
through the RS-232C port.
Manufacture
Mode
Use this mode, to realign the various
settings through the RS-232C port
during manufacture work
2 How to enter each mode
MODE PROCEDURE
User Mode Power ON
PC Mode Connect to the IBM PC compatible
machine and controlled by the FPU
3 Setting acquainted
User Mode PC Mode Manufacture Mode

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①PTT(Push-To-Talk)switch
Press this switch, then speak into the microphone to call a station. Release the
switch to receive.
②Monitor Key
Press and hold to monitor how busy the current channel is and to monitor signals
being received that don’t contain the matched QT/DQT code.
③Channel announcer
Press this switch to get current channel information.
④Channel selector
Rotate to select channels 1-16.
⑤LED indicator
Lights red while transmitting, green while receiving a signal. Flashes red when the
battery voltage is low while transmitting.
⑥Power switch/Volume control
Turn clockwise to switch the transceiver ON. Turn counterclockwise until a click
sound, to switch the transceiver OFF. Rotate to adjust the volume level.
PC MODE
Preface
The transceiver is programmed by using a personal computer, programming
interface (provided by ABELL) and programming software. Fig. 1 shows how the
devices work.
Connection procedure
1．Connect theTH-308G to the personal computer with the interface cable (UNX-05).
2．When data is transmitting from the transceiver the red LED lights.
When data is receiving by the transceiver the green LED lights.
Notes:
·The data stored in the personal computer must match the Model Name when it is
written into the EEPROM. Run the software and connect the transceiver with the
personal computer, and then turn ON.
·DO NOT press the [PTT] key during data transmission or reception.

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·Programming Interface Cable description
(PC programming interface cable: Option)
The programming interface cable is required to interface the TH-308G with the
computer. It has a circuit in its D-sub connector (9-pin) case that converts the RS-232C
logic level to the TTL level. The programming interface cable connects the side panel
jacks of the TH-308G to the computer’s RS-232C serial port.
·Programming software description
By installing programming software of TH-308G, users are allowed to program the
transceiver with programming interface cable.
·Programming with PC
If data is transferred to the transceiver from a personal computer with software
provide by ABELL, the destination data (basic radio information) for each set can be
modified. Normally, it is not necessary to modify the destination data because their
values are determined automatically when the frequency range (frequency type) is set.
The values should be modified only if necessary.
Data can be programmed into the EEPROM in RS-232C format via the SP MIC plug.

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DISASSEMBLY FOR REPAIR
Separating the case assembly from the chassis
1．Remove the two knobs ①and round nut ②.
2．Remove the two screws③.
3．Expand the right and left sides of the bottom of the case assembly, lift the chassis,
and remove it form the case assembly④.
4．Taking care not to cut the speaker lead⑤, open the chassis and case assembly.

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Separating the chassis from the unit
1．Remove the eleven screws⑥.
2．Remove the solder from the antenna terminal using a soldering iron then lift the unit
off⑦.
3．Remove the two screws ⑧and remove the antenna connector.
Note: When fixing the unit in the chassis, be sure to solder the antenna terminal.

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CIRCUIT DESCRIPTION
1. Frequency configuration
The receiver utilizes double conversion. The first IF is 21.70MHz and the second IF is
450 KHz. The first local oscillator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the necessary frequencies.
2. Receiver
The receiver is double conversion super heterodyne, designed to operate in the
frequency range of 136 to 150MHz, 150 to 174MHz and 136-174MHz.
1）Front-end RF amplifier
An incoming signal from the antenna is applied to an RF amplifier (Q500) after
passing through a transmit/receive switch circuit (D500 and D501 are off) and a band
pass LC filter. After the signal is amplified, the signal is filtered through a band pass
filter to eliminate unwanted signals before it is passed to the first mixer.
The voltages of these diodes are controlled by to track the CPU (IC302) center
frequency of the band pass filter.
2）First Mixer
The signal from the RF amplifier is heterodyned with the first local oscillator signal
from the PLL frequency synthesizer circuit at the first mixer (Q501) to create a
21.70MHz first intermediate frequency (1st IF) signal. The first If signal is then fed
through two monolithic crystal filters (X500 and X501) to further remove spurious
signals.
3）IF AMP
The first IF signal is amplified by Q502, and then enters IC500 (FM processing IC).
The signal is heterodyned again with a second local oscillator signal within IC500 to
create a 450 KHz second IF signal. The second IF signal is then fed through a 450 KHz
ceramic filter (CF1) to further eliminate unwanted signals before it is amplified and FM
detected in IC200.
4）AF amplifier
The AF signal from the IF IC500 is amplified by IC101C and passes through the
high-pass filter IC101B and de-emphasis filter Q102 and though R135, C112 remove
embitter. The signal passes through AF volume control circuit and enters the IC102
audio power amplifier to drive the speaker.
5）Squelch
Part of the AF signal from IC500 enters IC500 again, and the noise component is
amplified and rectified by a filter and an amplifier to produce a DC voltage
corresponding to the noise level. The DC signal goes to the analog port of the
microprocessor(IC302).IC302 determines whether to output sounds from the speaker

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by checking whether the input voltage is higher or lower than the preset value.
To output sounds from the speaker, IC302 sends a high signal to the AFCC lines and
turns IC102 on through Q107, Q109, Q106 and Q105.
6）Receive signaling
QT/DQT
300Hz and higher audio frequencies of the output signal from IF IC are cut by
IC101A and IC101D. IC302 determines whether the QT or DQT matches the preset
value, and controls the AFCC and the speaker output sounds according to the squelch
results.
3．PLL frequency synthesizer
The PLL circuit generates the first local oscillator signal for reception and the RF
signal for transmission.
1）PLL
The frequency step of the PLL circuit is 5 or 6.25 kHz. A 12.8 MHz reference
oscillator signal is divided at IC200 by a fixed counter to produce the 5 or 6.25 kHz
reference frequency. The voltage controlled oscillator (VCO) output signal is buffer
amplified by Q204, then divided in IC200 by a dual-module programmable counter. The
divided signal is compared in phase with the 5 or 6.25 kHz reference signal in the
phase comparator in IC200. The output signal from the phase comparator is filtered
through a low-pass filter and though the VCO to control the oscillator frequency.
2）VOC
The target frequency is produced by Q207(RX) and Q208(TX) centered
oscillator. The reference voltage is put on to varactor D202, D207, D205 and D206
to correct the VCO frequency. RXC and TX control the power to switch transmit or
receive.
3）UNLOCKED DETECOR
If a pulse signal appears at the LOCK pin of IC200, an unlocked condition occurs,
and the DC voltage obtained form D200, R219 and C224 causes the voltage applied to
the LOCK pin of the microprocessor to go low. When the microprocessor detects this
condition, the transmitter is disabled and the error indicating alarm occurs, ignoring the
push-to-talk switch input signal.
If the LOCK pin on IC200 is low electricity level，the detector will be loosed lock and
get DC from D200 and R219，the voltage generated by C224 to the lock foot of MPU
will be decreased simultaneity. When MPU detected this situation, it can not transmit
and ignoring the push-to-talk switch input signal.
4. Transmitter

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1）Transmit audio
The modulation signal from the microphone is amplified by IC100A, passes through a
preemphasis circuit, and amplified by the other IC100B to perform IDC operation. The
signal then passes through a low-pass filter (splatter filter) (Q101 and Q100) and cuts
3kHz and higher frequencies. The resulting signal goes to the VCO through the VCO
modulation terminal for direct FM modulation.
2）QT encoder
A necessary signal for QT encoding is generated by IC302 and adjusted by
FM-modulated to the PLL reference signal.
3）VCO and RF amplifier
The transmit signal obtained from the VCO buffer amplifier Q205, is amplified by Q206
and Q405. This amplified signal is passed to the power amplifier, Q404 and Q403,
which consists of a 2 stage FET amplifier and is capable of producing up to 3.5W of RF
power.
4）ANT switch and LPF
The RF amplifier output signal is passed through a low-pass filter network and a
transmit /receive switching circuit before it is passed to the antenna terminal. The
transmit /receive switching circuit is comprised of D400, D501 and D500. D501 and
D500 turned on (conductive) in transmit mode and off (isolated) in receive mode.
5）ATC
when the temperature of thermistor(TH400) reaches to 80 , the protection Circuit℃
turns on the Q409 to protect the final amplifier(Q403) from over heating.
5．Power supply
A 5V reference power supply [5V] for the control circuit is derived from an internal
battery. This reference is used to provide a 5V supply in transmit mode [TXC], a 5V
supply in receive mode [RXC], and a 5V supply common in both modes [PLC] based
on the control signal sent from the microprocessor.
6．Control system
The IC302 CPU operates at 18.0178 MHz.

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TH308GB VHF Parts List
Vision：1.0(See parts noted“*” in remarks) TH308GB(A37) A Board
Ref.
No. Specification Packing Description Quantity Part No.
Chip Resistor
1 0R 0603 ±5% 8 R156 R212 R325 R326 R327 R328 R329 R330
2 0.39R 1206 ±5% 3 R441 R442 R443
3 10R 0603 ±5% 2 R143 R315
4 100R 0603 ±5% 1 R512
5 330R 0603 ±5% 1 R317
6 470R 0603 ±5% 1 R162
7 1K 0603 ±5% 11 R149 R153 R154 R155 R167 R305 R310 R311 R312 R314 R410
8 1.5K 0603 ±5% 1 R119
9 1.8K 0603 ±5% 4 R116 R131 R165 R405
10 2.2K 0603 ±5% 1 R163
11 3K 0603 ±5% 2 R105 R428
12 3.3K 0603 ±5% 1 R403
13 4.7K 0603 ±5% 8 R125 R126 R209 R210 R302 R303 R304 R407
14 5.6K 0603 ±5% 5 R135 R136 R137 R171 R432
15 6.8K 0603 ±5% 1 R117
16 10K 0603 ±5% 9 R102 R122 R123 R152 R157 R168 R300 R301 R434
17 15K 0603 ±5% 1 R129
18 20K 0603 ±5% 1 R318

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19 22K 0603 ±5% 2 R118 R138
20 33K 0603 ±5% 1 R115
21 47K 0603 ±5% 9 R104 R150 R200 R205 R402 R404 R406 R416 R433
22 68K 0603 ±5% 2 R100 R322
23 100K 0603 ±5% 13
R101 R103 R134 R146 R147 R148 R161
R206 R306 R307 R308 R309 R429
24 120K 0603 ±5% 1 R133
25 150K 0603 ±1% 7 R141 R435 R436 R437 R438 R439 R440
26 180K 0603 ±5% 2 R151 R430
27 220K 0603 ±5% 1 R139
28 270K 0603 ±5% 1 R145
29 390K 0603 ±5% 1 R140
30 470K 0603 ±5% 1 R132
31 750K 0603 ±5% 1 R120
32 1M 0603 ±5% 2 R316 R431
Network Resistor
33 1K×4 4×0603 YC164-JR-071K 2 CP300 CP301
34 100K×4 4×0603 YC164-JR-07100K 1 CP302
Thermistor
35 NCP18WB473J03RB 0603 NTC 1 TH400
Adjustable Resistor
36 47K Φ2 EVM2WSX80BQ4 2 VR101 VR200
37 220K Φ2 EVM2WSX80BE5 1 VR100
Chip Capacitor
38 10PF 0603 COG,±5%,16V 1 C114
39 22PF 0603 COG,±5%,16V 2 C315 C316

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40 56PF 0603 COG,±5%,16V 1 C153
41 100PF 0603 COG,±5%,16V 2 C319 C445
42 220PF 0603 COG,±5%,16V 2 C148 C150
43 470PF 0603 X7R,±10%,16V 16
C118 C125 C126 C127 C128 C129 C130 C305 C306
C307 C401 C442 C443 C444 C446 C448
44 1000PF 0603 X7R,±10%,16V 5 C119 C145 C220 C228 C229
45 3900PF 0603 X7R,±10%,16V 2 C137 C324
46 4700PF 0603 X7R,±10%,16V 1 C135
47 5600PF 0603 X7R,±10%,16V 2 C138 C144
48 0.01UF 0402 X7R,±10%,16V 1 C104
49 0.01UF 0603 X7R,±10%,16V 7 C103 C139 C140 C141 C238 C256 C421
50 0.018UF 0603 X7R,±10%,16V 1 C112
51 0.022UF 0603 X7R,±10%,16V 3 C115 C116 C156
52 0.027UF 0603 X7R,±10%,16V 1 C124
53 0.033UF 0603 X7R,±10%,16V 2 C142 C147
54 0.047UF 0603 X7R,±10%,16V 3 C111 C113 C440
55 0.1UF 0603 X7R,±10%,16V 20
C120 C121 C131 C132 C133 C134 C301 C302 C303 C304
C308 C309 C317 C416 C418 C419 C550 C425 C439 C447
56 0.22UF 0603 X7R,±10%,16V 1 L302
57 1UF 0603
Y5V，±80% -20%,25V 4 C136 C143 C157 C310
58 1UF 0805
Y5V,±80%，-20%,25V 1 C207
59 NC 0603 3 C154 R127 R128
Tan-Capacitor
60 0.47UF A Type ±20%, 35V 1 C314
61 1UF A Type
±20%，16V 1 C311
62 4.7UF A Type
±20%，10V 2 C117 C202

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63 6.8UF A Type
±20%，10V 1 C441
64 10UF A Type
±20%，10V 4 C146 C155 C312 C313
Inductor
65 BLM11A601S
BLM18AG601SN1D 0603 Magnetic Beads 8 L101 L103 L200 L202 L300 L301 L402 R130
66 BLM21A601S
BLM21AG601SN1D 0805 Magnetic Beads 1 L102
67 LQH32MN1R0M23 1210 Winder、Ferrite 1 L405
Diode
68 ISR154-400 SOD-106 DIDOE 1 D102
69 ISS372 SOT-323 DIDOE 1 D100
70 LED-02-0603-QRC 0603 Red light 1 LED300
71 LED-02-0603-QGC 0603 Green light 1 LED301
72 MA2S11100L SOD-523 DIDOE 3 D101 D201 D300
Triode
73 2SA1362-GR SOT-23 TRANSISTOR 2 Q202 Q402
74 2SC1623 SOT-23 TRANSISTOR 1 Q211
75 2SC4617 SOT-416 TRANSISTOR 2 Q102 Q103
76 2SK1824 SOT-416 FET 1 Q104
77 DTA114YE SOT-416 TRANSISTOR 3 Q108 Q200 Q302
78 DTC114EE SOT-416 TRANSISTOR 7 Q110 Q209 Q300 Q301 Q400 Q401 Q409
79 DTC114TE SOT-416 TRANSISTOR 1 Q408
IC
80 AT24C08(SI27) SOP8 EEPROM 1 IC301
81 NJM2902V SSOP14 AUDIO AMP 1 IC101
82 NJM2904V SSOP8 ACTICE FIL TER 1 IC400

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83 PST9140NR SOT-25A RESET 1 IC303
84 µPD78F0512GA(T)-8EU-A QFP48 CPU（type after write）1 IC302
85 MC4558 SOP8 AUDIO AMP 1 IC100
86 XC6201P502PR SOT-89-3L IC(5V steady voltage) 1 IC300
Fuse
87 3A-32V 1206 R429003-3A-32V 1 FU100
晶体
88 18.0178MHz 6.0×3.5×1.0 18.0178MHz 1 X300
Vision：1.0(See parts noted“*” in remarks) TH308GB(A37) B Board
Ref.
NO. Specification Packing Description Quantity Part No.
Chip Resistor
1 0R 0603 ±5% 6 R158 R500 R501 R535 L210 L213
2 0R 0805 ±5% 2 L509 R420
3 10R 0603 ±5% 3 R144 R235 R518
4 18R 0603 ±5% 1 R421
5 22R 0603 ±5% 1 R422
6 47R 0603 ±5% 3 R418 R419 R519
7 100R 0603 ±5% 5 R214 R320 R321 R511 R513
8 150R 0603 ±5% 4 R166 R220 R221 R515
9 220R 0603 ±5% 2 R234 R517
10 270R 0603 ±5% 3 R227 R411 R412
11 330R 0603 ±5% 4 R229 R413 R414 R415
12 390R 0603 ±5% 1 R228
13 470R 0603 ±5% 1 R525

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14 560R 0603 ±5% 1 R215
15 820R 0603 ±5% 2 R514 R528
16 1K 0603 ±5% 8 R207 R216 R217 R218 R219 R222* R507 R529
17 1.2K 0603 ±5% 1 R521
18 1.5K 0603 ±5% 1 R424
19 2K 0603 ±5% 1 R237
20 2.2K 0603 ±5% 1 R534
21 2.2K 0402 ±5% 1 R164
22 2.7K 0603 ±5% 1 R527
23 3.3K 0603 ±5% 5 R232 R233 R417 R516 R537
24 3.3K 0402 ±5% 1 R106
25 3.9K 0603 ±5% 2 R423 R520
26 4.7K 0603 ±5% 4 R170 R211 R323 R324
27 5.6K 0603 ±5% 1 R231
28 8.2K 0603 ±5% 1 R121
29 8.2K 0402 ±5% 1 R169
30 10K 0603 ±5% 3 R112 R213 R510
31 10K 0402 ±5% 2 R107 R124
32 30K 0603 ±5% 1 R226
33 33K 0603 ±5% 4 R109 R110 R114 R236*
34 47K 0603 ±5% 4 R201 R202* R203 R204
35 56K 0603 ±5% 2 R111 R160
36 68K 0603 ±5% 1 R230
37 82K 0603 ±5% 4 R530 R531 R532 R533
38 100K 0402 ±5% 1 R313
39 100K 0603 ±5% 7 R208 R503 R504 R505 R506 R508 R509

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40 120K 0603 ±5% 2 R225 R502
41 150K 0402 ±5% 1 R319
42 180K 0603 ±5% 1 R522
43 220K 0603 ±5% 1 R524
44 390K 0603 ±5% 1 R536
45 470K 0603 ±5% 1 R523
46 470K 0402 ±5% 1 R159
47 680K 0603 ±5% 1 R526
48 1M 0603 ±5% 1 R223
49 1.8M 0402 ±5% 2 R108 R113
Network Resistor
50 1K×4 4×0603 YC164-JR-071K 1 CP200
Chip capacitor
51 0.5PF 0603 COG,±0.1PF,16V 3 C240 C241 C242
52 2PF 0603 COG,±0.1PF,16V 4 C534 C539 C540 C541
53 3PF 0603 COG,±0.1PF,16V 2 C218 C426
54 4PF 0603 COG,±0.1PF,16V 1 C527
55 5PF 0603 COG,±0.1PF,16V 1 C216
56 6PF 0603 COG,±0.25PF,16V 4 C217 C230 C506 C507
57 7PF 0603 COG,±0.5PF,16V 1 C245
58 8PF 0603 COG,±0.5PF,16V 2 C436 C538
59 10PF 0603 COG,±5%,16V 2 C400 C500
60 12PF 0603 COG,±5%,16V 5 C254 C255 C423 C430 C433
61 13PF 0603 COG,±5%,16V 1 C428
62 15PF 0603 COG,±5%,16V 4 C247 C427 C429 C434
63 18PF 0603 COG,±5%,16V 2 C243 C244

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64 20PF 0603 COG,±5%,16V 3 C431 C532 C542
65 22PF 0603 COG,±5%,16V 2 C546 C548
66 24PF 0603 COG,±5%,16V 1 C248
67 27PF 0603 COG,±5%,16V 3 C424 C432 C543
68 33PF 0603 COG,±5%,16V 2 C246 C521
69 39PF 0603 COG,±5%,16V 4 C533 C535 C537 C553
70 56PF 0603 COG,±5%,16V 1 C435
71 82PF 0603 COG,±5%,16V 2 C208 C544
72 100PF 0603 COG,±5%,16V 5 C159 C210 C211 C212 C505
73 150PF 0603 COG,±5%,16V 1 C545
74 180PF 0603 COG,±5%,16V 1 C209
75 220PF 0603 COG,±5%,16V 3 C149 C501 C502
76 470PF 0603 X7R,±10%,16V 4 C205 C404 C406 C515
77 680PF 0603 X7R,±10%,16V 1 C109
78 1000PF 0603 X7R,±10%,16V 38
C203 C204 C221 C222 C223 C224 C225 C226 C227 C239
C250
C403 C405 C407 C408 C409 C410 C411 C412 C413 C414
C422
C508 C509 C510 C511 C512 C513 C514 C522 C523 C524
C525 C526 C529 C530 C556 C557
79 3300PF 0603 X7R,±10%,16V 2 C106 C110
80 0.01UF 0603 X7R,±10%,16V 12
C105 C219 C237 C300 C320 C321 C322
C323 C420 C518 C519 C520
81 0.01UF 0402 X7R,±10%,16V 2 C102 C107
82 0.027UF 0603 X7R,±10%,16V 2 C318 C325
83 0.047UF 0603 X7R,±10%,16V 2 C108 C151

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84 0.047UF 0805 X7R,±10%,16V 1 C554
85 0.1UF 0603 X7R,±10%,16V 14
C122 C123 C231 C232 C233 C235 c251 C415
C417 C438 C516 C517 C551 C552
86 0.1UF 0805 X7R,±10%,16V 1 C236
87 0.22UF 0603 X7R,±10%,16V 1 C555
88 1UF 0603 Y5V,±80%-20%,25V 1 C160
89 1UF 0805 Y5V,±80%-20%,25V 2 C252 C402
90 *NC 0603 3 C213 C528 C531
91 NC 0603 8 C214 C215 C234 C503 C536 C547 L501 R224
Adjustable
capacitor
92 10PF Φ2 TZVY2Z100A001R00 4 TC200 TC201 TC501 TC502
93 NC Φ2 1 TC500
Tan-capacitor
94 0.68UF A Type ±20%，35V 1 C206
95 2.2UF A Type ±20%，10V 2 C100 C101
96 4.7UF R Type ±20%，6.3V 1 C253
97 4.7UF A Type ±20%，10V 3 C200 C201 C249
98 10UF A Type ±20%，10V 2 C158 C504
99 100UF C Type ±20%，10V 1 C152
Inductor
100 BLM11A601S
BLM18AG601SN1D 0603 Magnetic beads 6 L100 L201 L203 L204 L218 L220
101 BLM21A601S
BLM21AG601SN1D 0805 Magnetic beads 2 L400 L401
102 LQW2BHN27NJ03L 0805 HF, Multi-Layer inductor 1 L403