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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

Summary of Contents for TH308G

Page 1: ... Service Manual 0 ABELL INDUSTRIES CO LTD TH308G SERVICE MANUAL V 1 0 Web www abell com cn Email sales abell com cn TEL 86 755 26095567 FAX 86 755 26404666 ADD 2F 14BLDG Zhongxing Industries city NanShan Shenzhen China ...

Page 2: ... 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 ...

Page 3: ...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 terminat...

Page 4: ...ettings 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 ...

Page 5: ...kwise 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 ...

Page 6: ...ramming 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 ...

Page 7: ...embly from the chassis 1 Remove the two knobs and round nut 2 Remove the two screws 3 Expand the right and left sides of the bottom of the case assembly lift the chassis and remove it form the case assembly 4 Taking care not to cut the speaker lead open the chassis and case assembly ...

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

Page 9: ...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 si...

Page 10: ... 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 ...

Page 11: ...ich 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 an...

Page 12: ...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 060...

Page 13: ...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 ...

Page 14: ...104 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 ...

Page 15: ...DOE 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 Q...

Page 16: ...sion 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 1...

Page 17: ... 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 R5...

Page 18: ...p 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 C...

Page 19: ...4 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 C10...

Page 20: ... 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 bead...

Page 21: ...ductor 1 L215 113 MLG1608SR22J 0603 HF Multi Layer inductor 1 L511 114 NLV25T 1R0J PF 2520 HF Multi Layer inductor 2 L406 L502 115 NLV25T 2R2T PF 2520 HF Multi Layer inductor 1 L413 116 MLF2012A4R7 0805 LF Multi Layer inductor 1 L219 117 MLF1608E6R8K 0603 LF Multi Layer inductor 5 L205 L206 L207 L208 L209 118 MLF1608E100K 0603 LF Multi Layer inductor 1 L214 119 0 6 φ1 6 3TR P Type AIR CORE COIL wi...

Page 22: ...ANSISTOR 1 Q405 135 2SK1875 SOT 323 FET 2 Q207 Q208 136 2SK3475 SOT 89 3L FET 1 Q404 137 2SK3476 2 5N1A FET 1 Q403 138 3SK318 SOT 343 FET 2 Q500 Q501 139 AO3400 SOT 23 FET 1 Q105 140 DTA114EE SOT 416 TRANSISTOR 1 Q503 141 DTA114YE SOT 416 TRANSISTOR 1 Q201 142 DTC114EE SOT 416 TRANSISTOR 3 Q106 Q107 Q210 IC 143 GP460S1 GP214D TSOP16 PLL IC 1 IC200 144 TA31136FN TSOP16 IF SYSTEM 1 IC500 145 TA7368F...

Page 23: ... 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 1 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 7 R122 R123 R152 R168 R300...

Page 24: ...2 R133 R139 29 270K 0603 5 1 R145 30 390K 0603 5 1 R140 31 470K 0603 5 1 R132 32 750K 0603 5 1 R120 33 1M 0603 5 2 R316 R431 Network Resistor 34 1K 4 4 0603 YC164 JR 071K 2 CP300 CP301 35 100K 4 4 0603 YC164 JR 07100K 1 CP302 Thermistor 36 NCP18WB473J03RB 0603 NTC 1 TH400 Adjustable Resistor 37 47K Φ2 EVM2WSX80BQ4 2 VR101 VR200 38 220K Φ2 EVM2WSX80BE5 1 VR100 Chip Capacitor 39 10PF 0603 COG 5 16V ...

Page 25: ...C139 C141 C238 C256 C421 52 0 018UF 0603 X7R 10 16V 1 C140 53 0 022UF 0603 X7R 10 16V 3 C115 C116 C156 54 0 027UF 0603 X7R 10 16V 1 C124 55 0 033UF 0603 X7R 10 16V 3 C112 C142 C147 56 0 047UF 0603 X7R 10 16V 3 C111 C113 C440 57 0 1UF 0603 X7R 10 16V 21 C120 C121 C131 C132 C133 C134 C136 C301 C302 C303 C304 C308 C309 C317 C416 C418 C419 C550 C425 C439 C447 58 0 22UF 0603 X7R 10 16V 1 L302 59 1UF 06...

Page 26: ... QRC 0603 红灯 1 LED300 73 LED 02 0603 QGC 0603 绿灯 1 LED301 74 MA2S11100L SOD 523 DIDOE 3 D101 D201 D300 Triode 75 2SA1362 GR SOT 23 TRANSISTOR 2 Q202 Q402 76 2SC1623 SOT 23 TRANSISTOR 1 Q211 77 2SC4617 SOT 416 TRANSISTOR 2 Q102 Q103 78 2SK1824 SOT 416 FET 1 Q104 79 DTA114YE SOT 416 TRANSISTOR 3 Q108 Q200 Q302 80 DTC114EE SOT 416 TRANSISTOR 7 Q110 Q209 Q300 Q301 Q400 Q401 Q409 81 DTC114TE SOT 416 TR...

Page 27: ...al Production See parts noted in Remarks TH308GB B25 B Board Ref No Specification Packing Description Quantity Part NO Chip Resistor 1 0R 0603 5 7 R158 R500 R501 R535 L210 L213 C537 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 5 R166 R220 R221 R515 R528 9 220R 0603 ...

Page 28: ...K 0402 5 1 R106 22 3 9K 0603 5 2 R423 R520 23 4 7K 0603 5 4 R170 R211 R323 R324 24 5 6K 0603 5 1 R231 25 8 2K 0603 5 1 R121 26 8 2K 0402 5 1 R169 27 10K 0603 5 3 R112 R213 R510 28 10K 0402 5 2 R107 R124 29 27K 0603 5 1 R226 30 33K 0603 5 4 R109 R110 R114 R236 31 47K 0603 5 4 R201 R202 R203 R204 32 56K 0603 5 2 R111 R160 33 51K 0603 5 1 R225 34 68K 0603 5 1 R230 35 82K 0603 5 4 R530 R531 R532 R533 ...

Page 29: ...PF 16V 4 C240 C241 C242 C430 50 1PF 0603 COG 0 1PF 16V 1 C218 51 2PF 0603 COG 0 1PF 16V 4 C216 C539 C541 TC500 52 3PF 0603 COG 0 1PF 16V 2 C427 L504 53 4PF 0603 COG 0 1PF 16V 2 C230 C428 54 5PF 0603 COG 0 1PF 16V 2 C217 C400 55 6PF 0603 COG 0 25PF 16V 1 C507 56 7PF 0603 COG 0 5PF 16V 1 C432 57 8PF 0603 COG 0 5PF 16V 5 C244 C429 C431 C433 C534 58 10PF 0603 COG 5 16V 2 C434 C436 59 12PF 0603 COG 5 1...

Page 30: ... C109 74 1000PF 0603 X7R 10 16V 36 C203 C204 C221 C222 C223 C224 C225 C226 C227 C239 C250 C403 C405 C407 C408 C409 C410 C411 C413 C414 C422 C508 C509 C510 C511 C512 C513 C514 C523 C524 C525 C526 C529 C530 C556 C557 75 3300PF 0603 X7R 10 16V 2 C106 C110 76 0 01UF 0603 X7R 10 16V 12 C105 C219 C237 C300 C320 C321 C322 C323 C420 C518 C519 C520 77 0 01UF 0402 X7R 10 16V 2 C102 C107 78 0 027UF 0603 X7R ...

Page 31: ...e 20 6 3V 1 C253 92 4 7UF A Type 20 10V 2 C201 C249 93 3 3UF A Type 20 10V 1 C200 94 10UF A Type 20 10V 2 C158 C504 95 100UF C Type 20 10V 1 C152 Inductor 96 BLM11A601S BLM18AG601SN1D 0603 Magnetic beads 5 L100 L201 L203 L204 L218 97 BLM21A601S BLM21AG601SN1D 0805 Magnetic beads 2 L400 L401 98 LQN21A6N8D04 0805 HF multi layer inductor 2 L403 L404 99 LQW31HN23NJ03L 1206 HF multi layer inductor 1 L2...

Page 32: ...LF multi layer inductor 1 L219 113 MLF1608A1R0K 0603 LF multi layer inductor 1 L220 114 MLF1608E6R8K 0603 LF multi layer inductor 6 L205 L206 L207 L208 L209 R224 115 MLF1608A3R3KT000 0603 LF multi layer inductor 1 L214 116 0 6 φ1 6 3TR P type AIR CORE COIL with pin E 1 L408 117 0 4 φ1 6 4TR P type AIR CORE COIL with pin E 1 L412 118 0 4 φ1 8 4TR P type AIR CORE COIL with pin E 2 L407 L411 119 0 4 ...

Page 33: ...2SK508NV SOT 23 FET 2 Q207 Q208 134 2SK3475 SOT 89 3L FET 1 Q404 135 2SK3476 2 5N1A FET 1 Q403 136 3SK318 SOT 343 FET 2 Q500 Q501 137 AO3400 SOT 23 FET 1 Q105 138 DTA114EE SOT 416 TRANSISTOR 1 Q503 139 DTA114YE SOT 416 TRANSISTOR 1 Q201 140 DTC114EE SOT 416 TRANSISTOR 3 Q106 Q107 Q210 IC 141 GP460S1 GP214D TSOP16 PLL IC 1 IC200 142 TA31136FN TSOP16 IF SYSTEM 1 IC500 143 TA7368F SOP10 AUDIO POWER A...

Page 34: ...r JTBM450C24 1 CD1 7 Mic F0M6036P Φ6 3 6mm MIC 1 0K 1 M100 8 Microphone Jack ST 106 Gilt 1 J101B 9 Earphone Jack PJ 327 silvering 1 J101 10 Speaker 4Ω 1W FCE Φ36mm F36M285A GP F36M305A GP 1 SP100 11 Speaker Connection One pcs of red wire and one pcs of black wire 7pin copper wire Φ1 0 80mm PVC 2 12 Encoder ED08714O FE18C9 0 A16 100 1 VR300 13 Potentiometer Switch R09712NS FD15A7 5 B103 015 1 VR102...

Page 35: ...Volume Knob small 1 P07308 004 Channel knob big 1 P04308 002 LED 1 Light Transferring Pole P02308 002 Anode Bracket 1 Battery contact seat P05308 001 Back Shoulder 1 P12308 003 Back Button 1 P16308 002 Back button seat 1 P14308 003 Battery Lock 1 Rubber Parts L06307 003 Anode and cathode rubber orange dot 2 L01308 006 PTT New 1 L02308 016 PTT rubber sheet 8 5 3 0mm 1 Remark only used in Foreign bu...

Page 36: ...g 0 4 ф2 5 11h 10T 1 MKM025 013 Screw Φ2 5 5KM 2 Plating color antenna seat screw MPM025 043 Screw Φ2 5 7PM 2 Plating color fix housing and Aluminum case MPB017 023 Screw Φ1 7 4 0PB 1 Plating color fix the anode reed MPB020 033 Screw Φ2 0 3 5PBH 10 Plating color self drive screw used on PCB and cathode MPM030 012 Screw Φ3 6PMH 2 Plating black fix back shoulder M19090 002 Nut M08701 Φ9 0 2 0 1 Bras...

Page 37: ... or 200 250MHz G RA0K15110024 A0151 1 TH308G GB A80 B06308 002 Li ion battery Rapid charger Finished production Input 12VDC 600mA Output 8 3V 500mA 1 THCL500a Desktop Li ion battery Intelligent charger TH308G GB H series B10308 001 锂电电池成品 1200mA 7 4v AB 31A 1 TH308G GB H series B8221260 AB Exterior transformer Input 220VAC Output 12VDC 600mA 1 B8111260 AB Exterior transformer Input 110VAC Output ...

Page 38: ...rranty Card 1 year 1 TH308 series B04307 002 Battery bag 160 85mm 1 TH307 TH308 A80 B04307 002 Transceiver Bag 160 85mm 1 TH308 B09308 001 Hand Strap 1 Blue TH308 B01308 007 Introduction Manual 1 TH308G GB B03308 001 Packing Box 1 Color box Inner box TH308G GB Optional Earphone Small earphone and Microphone Jack 1 General ...

Page 39: ...ABELL TH 308G VHF Service Manual 38 EXPLODED VIEW ...

Page 40: ...ABELL TH 308G VHF Service Manual 39 PACKING ...

Page 41: ...anged to 500MHz or blow and measurements are highly stable and accurate about 0 2ppm 4 Power Meter 1 Measurable frequency Up to 500MHz 2 Impedance 50Ω instability 3 Measuring range full scare of 10W or so 4 A standard cable 5D2W 1m must be used 5 RF Voltmeter RF V M 1 Frequency range up to 500MHz or so 6 Linear Detector 1 Frequency range up to 500MHz or so Characteristics are flat CN is 60dB or mo...

Page 42: ...5mV to 1V 15 Distortion Meter 1 Frequency range 30Hz to 100KHz 2 Input level 50mVto10Vrms ADJUSTMENT FREQUENCE LIST Destination A37 B25 Channel TX MHz RX MHz TX MHz RX MHz Center 155 025 155 025 235 025 235 025 Low 136 025 136 025 220 025 220 025 High 173 975 173 975 249 975 249 975 Remark Connect the transceiver to the PC Send the channel data to the transceiver then backup the data Program the a...

Page 43: ...al power supply Relay terminal Jig chassis Use the TH 308GB VHF programming software for adjustment the following item in the PC mode Squelch Level Transmit frequency DQT balance RF power QT deviation DQT deviation Battery level Section common to the transmitter and receiver VCO Measurement Adjustment Item Condition Test equipment Terminal Parts Method Specifications Remarks ...

Page 44: ... that it becomes the spectrum waveform shown in fig1 2 Audio Lever 1 CH Rx center SSG output 80dBm 501µV MOD 1KHz DEV 3 0KHz Wide 1 5KHz Narrow SSG Oscilloscope AF V M Check 0 63Vrms 3 Sensiti vity 1 CH RX center CH RX LOW CH RX HIGH SSG output 116dBm 0 35µV MOD 1KHz DEV 3 0KHz wide 1 5KHz narrow Check SINAD 12 dB or higher 1 CH RX center MONI on 2 Level 9 SSG output 117dBm Level 9 Adjust to close...

Page 45: ...cilloscope Audio generator Audio voltmeter Antenna Speaker VR101 Check peak whichever is maximum 2 2KHz 3 6KHz wide bandwidth 1 1KHz 1 8KHz Narrow bandwidth 5 QT DEV 1 CH TX high QT 67 0Hz Modulation Analyzer or linear detector LPF 300Hz Oscilloscope Audio generator Audio voltmeter VR100 and PC Key Adjust to 0 75 KHz wide bandwidth Adjust to 0 35 KHz Narrow bandwidth 50Hz 50Hz 6 DQT DEV PC MODE 1 ...

Page 46: ...ABELL TH 308G VHF Service Manual 45 PC MODE flashed BPF Wave 图一 ...

Page 47: ...ER AMP HPF IC 100 UTC4558 LPF LPF TXC TXC 2S C4617 LED300 LED301 S300 MONITOR S100 PTT AT24C08 IC 302 UPD78F 0512GA T XC6201P502PR IC 200 GP460 GP214 13M X200 2S C1362 DTC114EE 2S C1362 DTC114EE DTA114YE ANT SW D400 D501 D500 IC 400 NJM2902 2sc4226 1S V325 2 D202 D207 D205 D206 1S V325 2 D208 1S V214 2S K1875 2S K1875 TX RXC Q200 DTA114YE Q202 2S A1362 Q209 DTC144EE RIPPLE FILTER Q211 D201 2S C162...

Page 48: ...UT AFCC PTT RXD TXD TX MODU VCO OUT LOCK CLK DATA STB PLCC RXCC CTC OUT PLL PLL Sch TX MODU VCO OUT LOCK CLK DATA STB PLCC RXCC CTC OUT PLCC AFCC TXCC RXCC STB DATA CLK LOCK BEEP CALL APC AF MUTE CTC OUT TX TXD RXD PTT TI BUSY BATOUT MCU CONTROL MCU CONTROL Sch PLCC AFCC TXCC RXCC STB DATA CLK LOCK BEEP CALL APC AF MUTE CTC OUT TX TXD RXD PTT TI BUSY BATOUT AF OUT ANT SW APC VCO OUT BUSY RECEIVER ...

Page 49: ...1K D300 MA2S111 R3161M C302 0 1U A0 1 A1 2 A2 3 GND 4 SDA 5 SCL 6 TEST 7 VCC 8 IC301 AT2408 R306 100K R301 10K C303 0 1U R303 4 7K VDD VDD AF MUTE AFCC APC CLK CTC OUT DATA LOCK MONI LED PLCC PTT LED PTT RXCC STB TX TXD TXCC R305 1K CP302 100k 4 VDD L301 磁珠 CP300 1k 4 R311 1K R310 1K N1 N2 N3 N4 R300 10K P60 1 P61 2 P62 3 P63 4 P33 5 P75 6 P74 7 P73 K 3 8 P72 K 2 9 P71 K 1 10 P70 K 0 11 P32 12 P3...

Page 50: ...B UTC4558 C139 10nF C143 1U Q100 2SC4617 C106 3300P C108 0 047U D101 MA2S111 8 9 10 IC101C NJM2902 7 6 5 IC101B NJM2902 1 2 3 4 11 IC101A NJM2902 14 13 12 IC101D NJM2902 C118 470PF REF REF L101 磁珠 AF MUTE AF OUT R123 10K R100 68K R103 100K VR100 220K R101 100K CTC OUT R102 10K L102 磁珠 D102 ISR154 400 C121 0 1U C128 470P C127 470P C157 1U C150 220P C149 220P C151 0 047U C123 0 1U C122 0 1U C159 1...

Page 51: ... D201 MA2S111 C202 4 7U R210 4 7K C215 NC R224 NC L204 磁珠 C207 1U Q206 2S C4226 Q205 2SC4226 L209 6 8UH L216 47NH R214 100R R218 1K R234 220R C223 102P C222 102P C248 24P C231 104P R223 1M C225 102P L212 39NH C226 102P C C E E B B Q208 2SK1875 PLC PLC PLC C230 6P C213 NC C214 NC Q204 2S C4226 R208 100K R207 1K L210 0R R235 10R C250 102P C249 4 7U C254 12P L219 4 7UH CLK LOCK DATA STB R220 150R C2...

Page 52: ... 47R R403 3 3K R402 47K R418 47R R411 270R D400 HVC131 D401 HSC277 Q403 2sk3476 Q404 2sk3475 C441 6 8U 10V C401 470P C414 102P C417 104P C413 102P C422 102P R422 22R TH400 47K C442 470P Q405 2SC4988 Q408 DTC114TE C432 27P L402 磁珠 C423 12P R421 18R C435 56P C434 15P R420 0R R412 270R L408 3T L412 4T C436 8P TXC C439 104 C440 473 Q401 DTC114EE R410 1K R428 3K C438 104 BATIN C421 103P C418 104P R406...

Page 53: ... 820R R512 100R X501 21 7M X500 21 7M CF1 450 C504 10U 6 3V X502 21 25M C532 20P C535 39P C542 20P D506 HVC350B D504 HVC350B C508 102P C509 102P C513 102P R505 100K R503 100K R504 100K R506 100K C555 224P C519 103P Q502 2S C2714 D503 HVC350B D501 HSC277 C553 39P R537 3 3K R509 100K R507 1K R518 10R C552 104P C554 473P C551 104P D502 HSC277 C533 39P R501 0R R500 0R C528 NC C531 NC R525 470R R534 2 ...

Page 54: ...ABELL TH 308G VHF Service Manual 53 TH308GB PART NUMBER VIEW A SIDE ...

Page 55: ...ABELL TH 308G VHF Service Manual 54 TH308GB PART NUMBER VIEW B SIDE ...

Page 56: ...ABELL TH 308G VHF Service Manual 55 TH308GB PC BOARD VIEW A SIDE ...

Page 57: ...ABELL TH 308G VHF Service Manual 56 TH308GB PC BOARD VIEW B SIDE ...

Page 58: ...pecification Frequency Range 136 174MHz A37 220 250MHz B25 RF Power Output 3 5W Channel Capacity 16 Channel Operating Voltage 7 5V DC 20 Temperature Range 30 to 60 22 to 140 Dimensions and weight 195g With 1200mA 7 4v AB 31A Li ion battery ...

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