QRP Labs QCX 5W CW, Assembly Instructions Manual

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QCX assembly Rev 1.08
2
Contents
1. Introduction .............................................................................................................................................................. 5
2. Parts list ..................................................................................................................................................................... 6
3. Assembly ................................................................................................................................................................... 7
3.1 Inventory parts ................................................................................................................................................ 13
3.2 Install IC2 socket ............................................................................................................................................. 14
3.3 Install DIP integrated circuits IC3, IC5-10 ........................................................................................................ 14
3.4 Install all 100nF (0.1uF) capacitors ................................................................................................................. 15
3.5 Install all 470nF capacitors .............................................................................................................................. 16
3.6 Install all 1nF capacitors .................................................................................................................................. 17
3.7 Install all 10nF capacitors ................................................................................................................................ 17
3.8 Install 47nF capacitors .................................................................................................................................... 18
3.9 Install 39nF capacitor ...................................................................................................................................... 18
3.10 Install 2.2nF capacitors ................................................................................................................................... 19
3.11 Install 33nF and 3.3nF capacitors .................................................................................................................... 19
3.12 Install capacitors C25 and C26 from the Low Pass Filter kit ........................................................................... 20
3.13 Install capacitors C27 and C28 from the Low Pass Filter kit ........................................................................... 21
3.14 Install capacitor C30 ........................................................................................................................................ 22
3.15 Install capacitors C5 and C8 ............................................................................................................................ 23
3.16 Install 1uF capacitor ........................................................................................................................................ 24
3.17 Install 1N4148 diodes ...................................................................................................................................... 24
3.18 Install 1N5819 diode ....................................................................................................................................... 25
3.19 Install 20MHz crystal XTAL1 ............................................................................................................................ 26
3.20 Install 27MHz crystal XTAL2 ............................................................................................................................ 27
3.21 Install all 10K resistors .................................................................................................................................... 27
3.22 Install all 1K resistors ...................................................................................................................................... 28
3.23 Install all 3.3K resistors ................................................................................................................................... 29
3.24 Install all 100-ohm resistors ............................................................................................................................ 29
3.25 Install 120K resistors ....................................................................................................................................... 30
3.26 Install 33K resistors ......................................................................................................................................... 30
3.27 Install 47K resistors ......................................................................................................................................... 31
3.28 Install 36K resistors ......................................................................................................................................... 31
3.29 Install 270-ohm resistor R48 ........................................................................................................................... 32
3.30 Install 470-ohm resistor R41 ........................................................................................................................... 32
3.31 Install 3.9K resistor R61................................................................................................................................... 33
3.32 Install 4.3K resistor R18................................................................................................................................... 33
3.33 Install 5.1K resistor R11................................................................................................................................... 34
3.34 Install 7.5K resistor R21................................................................................................................................... 34
3.35 Install 750K resistor R35.................................................................................................................................. 35
3.36 Install 100K trimmer potentiometer R47 ........................................................................................................ 35
3.37 Install 500-ohm multi-turn trimmer potentiometer ....................................................................................... 36
3.38 Install 50K multi-turn trimmer potentiomers ................................................................................................. 36
3.39 Install two 100uH inductors ............................................................................................................................ 37
3.40 Install 10uF capacitors .................................................................................................................................... 38
3.41 Install 220uF capacitor C47 (may be supplied as 470uF) ................................................................................ 39
3.42 Install 30pF trimmer capacitor C1 ................................................................................................................... 40
3.43 Install MPS2907 transistor Q6 ...........................................................................
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3.44 Install all BS170 transistors ............................................................................................................................. 41
3.45 Install 2x3-pin in-circuit programming header ............................................................................................... 41