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XIEGU X108G Service Manual

Summary of X108G

  • Page 1

    Hf transceiver version: 1.00.0 copyright © 2010~2017, xiegu communications x108g service manual xiegu communications 【 important notes】 before disassembling, make sure that the problem comes from inside the transceiver. Be sure to completely cut off the external power before opening case. Do not for...

  • Page 2: Part 1

    Basic specs: frequency range: rx: 0.5~30mhz tx: all ham band operate mode: ssb（j3e） cw （a1a） am （a3e） min freq. Step: 1hz antenna impedance: 50Ω operating temperature range: -10℃ ~ +60℃ frequency stability: ± 0.5ppm @ power on 5mins, -10℃~+60℃ operating voltage: 12~14.5v dc current parameter: rx 700...

  • Page 3: Part 2

    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 功放电源板正面 local oscillator module bpf module.

  • Page 5

    U17b vc voice compressor steady voltage power final rf power amplifier power standing wave detector.

  • Page 6: Part 3

    3.1 receiving circuit 3.1.1 rf front-end circuit the rf front-end circuit of 0.5--30mh is composed of a receiving band-pass filter, receiving preamplifier, pre attenuator. Band-pass filter consists of 5 modules (xgm1--xgm5), it can make 10 amateur bands. U20, u21 are band switching controller,connec...

  • Page 7

    The demodulation of am mode is accomplished by d2 and its peripheral circuit. The demodulated ssb, cw and am audio signals are input to the u13 audio switcher then switch in different modes and output. 3.1.7 audio unit the audio switcher u13 input an audio signal, this signal is amplified by the act...

  • Page 8

    3.2.6 power prime amplifier p2 outputs a transmitting small signal, this small signal is connected to the socket p4b on the power supply board by ipex wire, and it is prime amplified by q5b (2sc5551), then output by the t6b. 3.2.7 power amplifier units power amplifier units are composed of q4b 、 q3b...

  • Page 9

    Spk port is the external speaker interface, it connects to the audio power amplifier u9. Acc port is midi-din type 6 core data interface, which extends the external ptt signal, band voltage, external alc input, external audio, +9v and gnd ports. Aux interface function is not open yet, the internal c...

  • Page 10: Part 4

    Following the below debugging methods to adjust the parameters of the small signal board and the power amplifier board to resume to default setting. 4.1 machines machine specs machine specs dc power supply output voltage: 13.8v rf spectrum analyzer frequency range: 0.1-1000mhz output current: maximu...

  • Page 11

    4) signal source output a signal, connect it to the antenna interface of x108g. 5) use oscilloscope to observe the signal amplitude of test point(signal frequency:1khz). 6) adjust the 2 nd if transformert1 to make the range of magnitude observed on the oscilloscope is the largest (normally it is mor...

  • Page 12

    4.2.4 nb unit test required machines and its settings machine setting specs rf signal source frequency: 14.251mhz, output amplitude: -80dbm digital multimeter dc voltage test note: during the test, do not turn-on the x108g to transmit, otherwise the rf signal source will be damaged! 1) set the recei...

  • Page 13

    1) set the receiving frequency of x108g to be 14.25000mhz, [usb] mode. 2) open [pre],close [att] and [agc] and [sql]. 3) connect the output port of the rf signal source to the antenna interface of the x108g; 4) turn off the rf signal source output, adjust the s table reference voltage potentiometerr...

  • Page 14

    4.2.7 modulation audio signal amplitude adjustment required machines and its settings machine setting specs audio frequency generator frequency:1khz amplitude:100mv-vpp 50w rf load 1) set the receiving frequency of x108g to be 14.25000mhz, [usb] mode. 2) connect the rf load to the antenna port of th...

  • Page 15

    1) set the receiving frequency of x108g to be 14.25000mhz, [usb] mode. 2) connect the rf load to the antenna interface of the x108g. 3) connect the tx output signal of the small signal board rf spectrum analyzer. 4) the output signal of the audio signal source is connected to a special test micropho...

  • Page 16

    4.2.10 transmit closed loop debugging required machines and its settings machine setting specs digital multimeter dc voltage test gear spectrum analyzer central frequency:14.25mhz bw:5mhz 50w rf load 1) set the receiving frequency of x108g to be 14.25000mhz, [cw] mode，power 20w 2) connect the rf loa...

  • Page 17

    4.2.11 power amplifier unit static debugging required machines and its settings machine setting specs digital ammeter dc voltage test gear 50w rf load 1) set the receiving frequency of x108g to be 14.25000mhz, [usb] mode. 2) unplug the tx signal line from small signal board to the power amplifier bo...

  • Page 18: Part 5

    Power amplifier board no. Item specs package brand mpn designator 1 aluminum solid cap 100uf würth 875105359010 c1b, c2b, c7b, c8b, c90b, c110b, c113b 2 capacitor 100nf 0603 murata grm188r71h104ka93 c3b, c4b, c5b, c6b, c40b, c45b, c46b, c56b, c59b, c60b, c61b, c62b, c66b, c67b, c68b, c69b, c70b, c73...

  • Page 19

    30 capacitor 22pf 0805 murata grm21a5c2d220jw01 c134b 31 capacitor 82pf 0805 murata grm21a5c2d820jw01 c138b 32 schottky diode 1ss372 sc-70 toshiba 1ss372 d1b, d2b 33 zener diode 10v sod-323 changjiang electronic bzt52c10v0s d3b, d4b, d16b 34 diode 1n4007 do-214ac domestic m7 d5b 35 zener diode 5.1v ...

  • Page 20

    57 fet fds4435bz so-8 fairchild fds4435bz q6b, q8b 58 rf fet bc868 sot-89 philips bc868 q7b 59 fet irlml5203pbf sot-23 ir irlml5203pbf q9b, q10b 60 digital triode dtc114eka sot-23 rohm dtc114eka q26 61 resistance 51r 1206 yageo rc1206fr-0751r r1b, r2b 62 resistance 330r 0603 yageo rc0603fr-07330r r3...

  • Page 21

    Transformer de 96 common mode inductance through-hole domestic custom made t4b 97 common mode inductance 744253200 smt würth 744253200 t5b, t6b 98 integrated circuit lm2940t-9.0 to-220 ti lm2940t-9.0 u1b 99 integrated circuit l7805cv to-220 st l7805cv u2b 100 integrated circuit 74hc238pw tssop-16 nx...

  • Page 22

    16 resistance 10k 0603 yageo rc0603fr-0710k r5 17 resistance 1.2m 0603 yageo rc0603fr-071m2 r11 18 resistance 15k 0603 yageo rc0603fr-0715k r12 19 resistance 1.2k 0603 yageo rc0603fr-071k2 r13 20 exclusion 10k 8p4r yageo yc164-jr0710k rp1, rp2 21 ic mc34063ebd so-8 st mc34063ebd u1 local vibration b...

  • Page 23

    28 tcxo 26mhz dsb321sdn 3225 kds 26mhz dsb321sdn x1 29 ceramic filter tdk107ms180k through-h ole tdk tdk107ms180k xf3 small signal board no. Item specs package brand mpn designator 1 button type lithium battery ms920se fl27e smt seiko ms920se fl27e bt1 2 capacitance 100nf 0603 murata grm188r71h104ka...

  • Page 24

    14 capacitance 33pf 0603 murata grm1885c2a330ja01 c31, c32 15 aluminum solid capacitance 330uf würth 875115350004 c43, c160 16 capacitance 47nf 0603 murata grm188r71h473ka61 c53 17 aluminum solid capacitance 47uf würth 875105359006 c54, c169, c190 18 capacitance 22pf 0402 murata grm1552c2a220ga01 c8...

  • Page 25

    43 winding inductance 100uh 0805 tdk glf2012t101k l3, l4, l5, l6, l7, l13, l19, l20, l22, l26, l27, l30, l32, l35, l37, l38, l39, l43, l44, l47, l48, l49, l50 44 winding inductance 10uh 0805 tdk glf2012t100k l8 45 winding inductance 470uh 1210 würth 744032471 l14 46 winding inductance 1uh 0805 tdk g...

  • Page 26

    68 resistance 100r 0603 yageo rc0603fr-07100r r4, r20, r39, r40, r53, r64, r65, r71, r82, r108, r121, r122, r127, r132, r134, r137, r150, r154, r181, r184, r187, r190, r196, r197 69 resistance 15k 0603 yageo rc0603fr-0715k r5 70 resistance 10k 0603 yageo rc0603fr-0710k r6, r9, r10, r41, r63, r72, r8...

  • Page 27

    94 resistance 5.1k 0603 yageo rc0603fr-075k1 r83, r102, r186 95 resistance 220r 0603 yageo rc0603fr-07220r r93 96 resistance 33k 0603 yageo rc0603fr-0733k r110, r145, r163, r164 97 resistance 680r 0603 yageo r111, r165 98 resistance 20k 0603 yageo rc0603fr-0720k r133, r183 99 resistance 68k 0603 yag...

  • Page 28

    Oscillator 136 crystal oscillator 32.768khz 3215-2pin epson x2 137 crystal filter 49u sunny - xf1 138 xiegu module 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/...

  • Page 29: Part 6

    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

    D6 ma2z077 l4 100uh r21 2.7k +9r r99 2.7k r89 2.7k c82 100nf c106 100nf l30 100uh l37 100uh c87 100nf c100 100nf +9r +9t r32 4.7k a0 1 a1 2 a2 3 e1 4 e2 5 e3 6 y7 7 y6 9 y5 10 y4 11 y3 12 y2 13 y1 14 y0 15 u21 74hc238pw +5 c140 100nf vcc c58 100nf c94 100nf r82 100r r22 1m r101 68r r37 1k c25 100nf ...

  • Page 35

    1 jp1b nc 1 jp2b nc 1 jp3b nc x108g base-board-v1.43.5b 1 jp4b nc 1 jp5b nc 1 jp6b nc 1 jp7b nc r47b 1k r51b 1k +9r +9t +9 mic_en msvsw ptt1 mdata r48b 100r r49b 10k r45b 100k r50b 30k c109b 100nf +9 r43b 15k r44b 100r r46b 100r +9 +9t +9r mic_sig pwr_sw1 +5 vin_smp po_fwd po_rev po_set mode_am band...

  • Page 36

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