QRP Labs QCX-mini CW, Руководство по сборке, Страница: 2 / 121

Contents
1. Introduction....................................................................................................................................................4
2. Parts list..........................................................................................................................................................5
3. Assembly – general guidelines......................................................................................................................10
3.1 Inventory parts.......................................................................................................................................22
3.2 Wind and install transformer T1.............................................................................................................23
3.3 Install IC2 socket.....................................................................................................................................30
3.4 Install 100nF (0.1uF, “104”) capacitors...................................................................................................31
3.5 Install all 470nF, “474” capacitors...........................................................................................................32
3.6 Install 47nF, “473” capacitor...................................................................................................................32
3.7 Install capacitors C25 and C26 from Low Pass Filter kit..........................................................................33
3.8 Install capacitors C27 and C28 from Low Pass Filter kit..........................................................................34
3.9 Install capacitor C30................................................................................................................................35
3.10 Install capacitors C5 and C8..................................................................................................................36
3.11 Install 1uF, “105” capacitors C21, and C22...........................................................................................37
3.12 Install 1N5819 diode.............................................................................................................................38
3.13 Install 20MHz crystal XTAL1..................................................................................................................39
3.14 Install 27MHz crystal XTAL2 or TCXO option.........................................................................................40
3.15 Install 500-ohm multi-turn trimmer potentiometer.............................................................................42
3.16 Install 50K multi-turn trimmer potentiometers....................................................................................43
3.17 Install 470uF capacitors........................................................................................................................44
3.18 Install 30pF trimmer capacitor C1.........................................................................................................45
3.19 Install MPS751 transistor Q6................................................................................................................46
3.20 Install three BS170 transistors..............................................................................................................47
3.21 Install 2x3-pin in-circuit programming header......................................................................................48
3.22 Install 2x5 LCD header..........................................................................................................................49
3.23 Install 2x4 UI header.............................................................................................................................50
3.24 Wind and install toroid L4.....................................................................................................................50
3.25 Wind and install toroid L2.....................................................................................................................52
3.26 Wind and install toroids L1 and L3........................................................................................................53
3.27 Install 2.1mm power connector............................................................................................................54
3.28 Install RF output BNC connector...........................................................................................................55
3.29 Install 3.5mm stereo jack connectors...................................................................................................56
3.30 Break apart inner PCBs of display board...............................................................................................57
3.31 Install LCD module................................................................................................................................59
3.32 Install 2x5-pin male pin header connector...........................................................................................60
3.33 Install four 11mm nylon spacers...........................................................................................................60
3.34 Install 20K trimmer potentiometer R47................................................................................................61
3.35 Install 2x4-pin male header on controls PCB........................................................................................62
3.36 Install rotary encoder............................................................................................................................63
3.37 Install tactile switch buttons.................................................................................................................64
3.38 Install gain control potentiometer R36.................................................................................................64
3.39 Install 11mm nylon hex spacer.............................................................................................................65
3.40 Fit Controls PCB to main PCB................................................................................................................66
3.41 Install microcontroller...........................................................................................................................67
3.42 10uF input capacitor C38......................................................................................................................67
3.43 Plug together the two boards...............................................................................................................70
3.44 Connections for basic operation...........................................................................................................70
3.45 Notes on fault-finding for the QCX-mini...............................................................................................71
3.46 Adjustment and alignment...................................................................................................................72
QCX-mini assembly Rev 1.05
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