XIEGU X108G Service Manual Download Page 4 | Manualshive

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background image

Small signal back panel

功放电源板正面

Local

oscillator

module

BPF module

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Summary of Contents for X108G

Page 1: ...he external power before opening case Do not forcibly remove any parts to avoid any damage Please use insulated screwdriver to adjust the circuit to avoid short circuit Do not turn on the radio for a...

Page 2: ...0 45 180 mm Not including knob holder etc TX TX Power 15W 13 8V Modulation SSB Balanced modulation AM Low level modulation Spurious suppression 40dBc Carrier suppression 45dBc Selectivity SSB 2 2kHz 6...

Page 3: ...Small signal front panel Part 2 Inside Circuit U17 Microprocessor RW4 Mic amplifier gain adjustment Intermediate frequency amplifier unit U10 Transmit Mixer U5 Receive Mixer...

Page 4: ...Small signal back panel Local oscillator module BPF module...

Page 5: ...U17B VC Voice Compressor Steady voltage power Final RF power amplifier Power standing wave detector...

Page 6: ...he first IF amplify This amplified IF signal outputs to intermediate frequency crystal filter IFCF by T5 Q6 is NB control switch which controls the conducting of the Q21 3 1 4 IFCF sets The radio is b...

Page 7: ...ts of U15B and U17B U15B SSM2167 has voice amplification and voice compression function and the compression ratio is switched by U15B 3 2 2 Modulator circuit The microphone amplified signal enters the...

Page 8: ...t of antenna port and reflected power U5B buffs and amplify the tested output signal then sent to the microcontroller for processing and display the power and SW value 3 2 10 Automatic power control c...

Page 9: ...nd voltage generator consists of microprocessor and U25 and U26 3 4 Power unit There are 2 groups main power supply for X108G 9V and 5V which are generated by U1B LM2940T 9 0 and U2B LM7805 on the pow...

Page 10: ...r Measuring range 0 001 10A External speaker 8 2W All equipment has been measured and tested within the period of validity 4 2 Small signal board debugging 4 2 1 The small signal board has used the ne...

Page 11: ...Setting specs RF signal source Frequency 14 251MHz initial output amplitude 10uV Audio analyzer SINAD test 1 Set the receiving frequency of X108G to be 14 25000MHz USB mode 2 Open PRE close ATT and AG...

Page 12: ...close ATT and AGC and SQL 3 Measure the voltage of NB unit test point with digital multimeter 4 Adjust NB amplify IF transformerT16 to make the test point voltage to be minimum around 1 55V 5 Turn off...

Page 13: ...tude by the each signal intensity as displayed on a screen and then press the SET button to enter the next level of signal settings 6 After setting all the signal levels press the SAVE button to save...

Page 14: ...nplug the TX signal line from small signal board to the power amplifier board 4 Measure the amplitude of the test point TP10 with oscilloscope 5 Press PTT of hand microphone adjust PotentiometerRW4 to...

Page 15: ...Required machines and its settings Machine Setting specs Audio frequency generator Frequency 1kHz Amplitude 100mV Vpp Spectrum analyzer Central frequency 14 25MHz BW 10MHz 50W RF load 1 Set the recei...

Page 16: ...z BW 5MHz 50W RF load 1 Set the receiving frequency of X108G to be 14 25000MHz CW mode power 20W 2 Connect the RF load to the antenna interface of the X108G 3 Press the CW key to start the transmit me...

Page 17: ...a dedicated test microphone to X108 disconnect the microphone input then press PTT to start the transmitting and record the current ammeter value as a baseline reading 6 Solder four debug solder join...

Page 18: ...pF 0805 Murata GQM2195C2E750GB12 C26B C52B 12 capacitor 30pF 0805 Murata GQM2195C2E300GB12 C29B 13 capacitor 150pF 0805 Murata GRM21A5C2D151JW01 C30B 14 capacitor 27pF 0805 Murata GRM21A5C2D270JW01 C3...

Page 19: ...1 Magnetic inductance T37 2 Through Hole HOMEMA DE L5B L6B 42 Magnetic inductance T37 2 Through Hole HOMEMA DE L7B L8B 43 Magnetic inductance T37 2 Through Hole HOMEMA DE L9B L10B 44 Magnetic inductan...

Page 20: ...geo RC0603FR 075R1 R22B R26B 75 Resistance 1 8k 0603 Yageo RC0603FR 071K8 R24B R25B 76 Resistance 680R 0603 Yageo RC0603FR 07680R R27B R34B 77 Resistance 150R 0603 Yageo RC0603FR 07150R R28B 78 Resist...

Page 21: ...n board parts NO Item SPECS PACKAGE BRAND MPN Designator 1 Capacitance 47uF 3225 Murata GRM32ER7YA476KE15L C1 2 Capacitance 100nF 0603 Murata GRM188R71H104KA93 C2 C3 C4 C5 C7 C8 C9 3 Capacitance 1nF 0...

Page 22: ...RM1552C2A100GA01 C39 C44 8 Winding inductance 100uH 0805 TDK GLF2012T101K L1 L2 9 High Q Winding inductance 270nH 1210 TDK NLV32T 271J PF L3 L4 10 BTB Connector Spacing 0 8mm SMT domestic P1 11 RF Con...

Page 23: ...72 C182 C188 C192 C201 C212 C215 3 Capacitance 2 2pF 0603 Murata GRM1885C2A2R2BA01 C3 C110 4 Capacitance 68pF 0603 Murata GRM1885C2A680JA01 C5 C10 C23 C36 C42 C69 C121 C164 5 Capacitance 1nF 0603 Mura...

Page 24: ...Capacitance 2 2uF 0805 Murata GRM21BR71E225ME11 C179 C180 28 Capacitance 330pF 0603 Murata GRM1885C2A331JA01 C196 29 Capacitance 10pF 0603 Murata GRM1885C2A100JA01 C204 30 Capacitance 220pF 0603 Murat...

Page 25: ...mm 2P domestic P7 54 BTB Connector spacing0 8mm SMT domestic P10 55 Connector MINI DIN6 Through Hole domestic P11 56 Digital triode DTC114EKA SC 59 ROHM DTC114EKA Q1 Q2 Q8 Q9 Q11 Q12 Q23 Q24 Q26 57 FE...

Page 26: ...k 0603 Yageo RC0603FR 0747K R18 R138 R151 R152 78 Resistance 2 7k 0603 Yageo RC0603FR 072K7 R21 R29 R35 R46 R68 R81 R89 R90 R99 R131 79 Resistance 1M 0603 Yageo RC0603FR 071M R22 80 Resistance 220k 06...

Page 27: ...sformer 1802 5x5 SMT T5 T16 112 IF transformer 1404 5x5 SMT T7 113 Single Pin Header 2 54mmspacing SIP2 domestic TP3 TP8 114 IC BU4S66G2 SOT 23 5 ROHM BU4S66G2 U1 115 IC LM321MF SOT 23 5 TI LM321MF U2...

Page 28: ...ule 80m 160m module Xiegu XGM1 139 Xiegu module 40m 60m module Xiegu XGM2 140 Xiegu module 20m 30m module Xiegu XGM3 141 Xiegu module 15m 17m module Xiegu XGM4 142 Xiegu module 10m 12m module Xiegu XG...

Page 29: ...Part 6 PCB Small signal board TOP...

Page 30: ...Small signal board BOTT...

Page 31: ...AMP Power board TOP...

Page 32: ...AMP Power board BOTT...

Page 33: ...Part 7 Radio block diagram...

Page 34: ...T SW Keyer J5 PJ 3 5 ST SW R121 100R R122 100R LB4 600R LB6 600R C141 1nF C145 1nF L51 1uH R197 100R R196 100R C64 100nF R73 NC L23 1uH L24 1uH C148 100nF C149 100nF C150 100nF C151 100nF C152 100nF C...

Page 35: ...F C38B 120pF Fo 14 5MHz L9B T37 2 11T L10B T37 2 11T C48B 220pF C49B 100pF 3 5 1 3 4 5 6 1 2 K11B HRB1 S DC5V 5 5 C41B 12pF C42B 12pF C47B 100pF Fo 21 5MHz L13B T37 2 8T L14B T37 2 9T C54B 68pF C55B 1...

Page 36: ...WWW CQXIEGU COM XIEGU COMMUNICATIONS...

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