CRKITS CRK-10A Manuel
CRK-10A CW Transceiver
Kit Manual
Rev. A
CRKITS.COM
May 19, 2013
C ange History:
May 19, 2013: Initial release - Rev. A
Introduction
T anks for c oosing CRK-10A CW Transceiver kit. It is a great one-evening project to provide
you pure fun of bot kit building and QRP operation. CRK-10A design is inspired by RockMite
from Small Wonder Labs. RockMite was introduced to C ina years ago by BD6CR/4. BD4RG, t e
designer of HB-1A and HB-1B, improved t e design by rewriting t e firmware, increasing RF
power output, and smoot ing t e keying. T e improved version is called Octopus in C ina, and as
already received a good reputation and popularity among C inese QRPers. Previously, we
introduced t e SMD version 40 meter CW transceiver kit called CRK-10, and now we are glad to
announce t e t roug - ole version CRK-10A wit improvements.
T e major c anges from CRK-10:
•CRK-10 is a ybrid kit wit all t e SMD parts pre-mounted and about 20 pcs t roug - ole
parts to install, but CRK-10A is a pure kit wit all t roug - ole parts to install.
•CRK-10 supports 40 meter band only, w ile CRK-10A supports 40 meter or 30 meter band.
•CRK-10A removes t e paddle dot/das wiring jumpers, and adds a pus button to confirm
t e side band of t e incoming signal
•CRK-10A follows KN-Q7A style to use PCB panels, provides IC sockets and case feet to
make it a more complete and good looking kit
T e CRK-10A specifications follow CRK-10 t at t e RF output power is about 3 watt at 12V
(slig tly lower for 30 meter band). Power supply range is 9-15V. TX current is about 500 mA, and
RX current is about 15 mA (measured at 12V). T e built-in MCU can generate side tone of about
700 Hz, switc RX/TX, and act as a keyer for not only paddle (normal paddle or bug key simulation
mode), but also straig t key.
T e receiver is a direct conversion receiver, but t e sensitivity and selectivity are very ig
because of a two-pole crystal filter in t e receiver front-end and an audio filter, w ic block
interference and filter out background noise. T e MCU automatically s ifts TX frequency,
generates side tone and acts as t e keyer, w ic makes t e w ole radio quite practical. T e power
supply polarity protection and t e ig SWR protection make t e radio durable.
Disclaimer
We offer t e kit as is and do not guarantee t e assembled kit by yourself can meet your local
regulatory requirements, including spurious, environmental or ot ers. As some parts used in t e kit
are obsolete, we cannot guarantee t at all t e components in t e kit are brand new, but we bear t e
responsibility of providing t em as good as possible.
Parts Inventory
Follow t e part list below to do parts inventory first. Please note t e difference between 30
meter kit and 40 meter kit. If t ere are any missing parts or questions, please contact your local
distributor or CRKITS.COM directly by email at rongx @gmail.com.
Item Quantity Value Comments
Resistor 2 22 R3, R18
Resistor 2 100 R1, R23
Resistor 2 220 R8, R14
Resistor 2 1 k R5, R9
Resistor 2 2.2 k R6, R22
Resistor 4 4.7 k R10, R15, R16, R24
Resistor 2 22 k R7, R20
Resistor 1 33 k R2
Resistor 2 47 k R4, R11
Resistor 3 220 k R17, R19, R21
Resistor 2 2.2 M R12, R13
Capacitor, ceramic 3 33 p C7, C11, C26
Capacitor, ceramic 1 56 p (30 m) or 100 p
(40 m)
C9
Capacitor, ceramic 6 100 p C4, C15, C16, C21, C34, C35
Capacitor, ceramic 2 220 p (30m) or 470 p
(40 m)
C6, C8'
Capacitor, ceramic 2 470 p (30m) or 1000 p
(40 m)
C8, C10
Capacitor, ceramic 7 0.01 uF C3, C12~C14, C17, C19, C22
Capacitor, ceramic 1 0.01 uF (30 m) or
leave it not installed
(40 m)
C25
Capacitor, ceramic 7 0.1 uF C2, C5, C18, C20, C27~C29
Capacitor, trimmer 2 9-50 pF C23 (for TX), C24 (for RX)
Capacitor, electrolytic 1 10 uF 25 V C33
Capacitor, electrolytic 2 100 uF 25 V C1, C32
Capacitor, polyester
film
2 0.01 uF, 2A103J C30, C31
Diode 7 1N4148, glass body D2, D4, D5~D9
Diode 1 1N5817, black D1
Diode 1 1N4755A, silver D3
Regulator IC 1 78L05 78L05
IC socket 3 8-pin 8-pin
IC, balanced mixer 1 NE602 IC1
IC, op amp 1 NE5532 IC2
IC, MCU 1 12F629, programmed IC3
Transistor 2 2N3904 Q1, Q2
Transistor 1 2N3906 Q4
Transistor 1 2N4401 Q5
Field Effect Transistor 1 J309 Q3
Power Amp. transistor 1 2SC1162 Q6
Inductor, fixed 1 10 uH L1
Inductor, toroid 2 T37-2, red L2 (10 turns), L3 (12 turns)
Enamel wire 0.4m 0.38mm diameter For L2 and L3 winding
Pus button 2 PCB mount SW, SW1
3.5mm jack 2 3.5 mm stereo type PHONE, KEY
DC IN connector 1 2.1 mm type +V
Crystal 3 7.010, 7.020, 7.025,
7.030, 10.106 or
10.130 MHz
X1, X2, X3
T ermal pad /
insulator
1 TO-220 type Wit back paste, stick to inner side of
t e rear panel plated area
M3x8 screw 1 M3x8, black, pan
ead
For fixing 2SC1162
M3 nut 1 M3, black For fixing 2SC1162
Antenna connector 1 BNC, PCB mount ANTENNA, wit was er and nut
M2.5x6 panel screw 8 Black, pan ead For front and rear panels
Case 1 CRK-10, black Wit front and rear panels
PCB 1 CW-DC-1P
Step by Step Building
It takes about 2.5 ours to build and align t e kit. You will need to prepare basic soldering and
alignment tools to be able to build t is kit.
Step 1: Resistors
Stuff all t e resistors, solder and cut t e extra leads. If you are not sure about t e color codes,
you can use an o m meter to verify value before you solder.
First 3 colors are listed. If necessary, use an o mmeter to verify value.
•R3, R18 22 (Red, red, black)
•R1, R23 100 (Brown, black, brown)
•R8, R14 220 (Red, red, brown)
•R5, R9 1 k (Brown, black, red)
•R6, R22 2.2 k (Red, red, red)
•R10, R15, R16, R24 4.7 k (Yellow, violet, red)
•R7, R20 22 k (Red, red, orange)
•R2 33 k (Orange, orange, orange)
•R4, R11 47 k (Yellow, violet, orange)
•R17, R19, R21 220 k (Red, red, yellow)
•R12, R13 2.2 M (Red, red, green)
Step 2: Diodes
Stuff all t e diodes. Note for t e polarity. Solder and cut t e extra leads.
•D2, D4, D5~D9 1N4148, glass body
•D1 1N5817, black
•D3 1N4755A, silver
Step 3: Ceramic capacitors, regulator IC and IC sockets
Install all t e 0.01 uF (103) and 0.1 uF (104) ceramic capacitors. C25 is only required for 30
meter kit.
•C3, C12~C14, C17, C19, C22 0.01 uF
•C25 0.01 uF (30 m)
not installed (40 m)
•C2, C5, C18, C20, C27~C29 0.1 uF
Install t e DC IN socket. If it is a bit protruding outside of t e board edge, press it towards
inside t en solder.
Install 78L05 regulator IC. Make sure t e outline is aligned.
Install 3 pcs IC sockets. Make sure t e notc es are aligned.
Test: Apply power supply of 9-15 V DC, center positive, measure 5 V at pin 8 of IC1.
Step 4: Audio filter and amplifier
Install Q3 (J309). Note for static sensitive part. Handle wit care.
Install C32 (100 uF 25 V) and C33 (10 uF 25 V). Note for polarity.
Install C30 and C31 (polyester film 0.01 uF, 2A103J).
Install C21 (100 p).
Install PHONE jack.
Insert IC2 (NE5532). Note for orientation.
Test: Apply power supply, and connector a eadp one to PHONE jack. Use tweezers to touc
pin 4 of IC1 and ear noise.
Step 5: CU
Install KEY jack
Install SW
Install C26 (33 p), C34 (100 p) and C35 (100 p)
Insert IC3 (12F629). Note for orientation.
Test: Apply power supply, and connect a eadp one to PHONE jack. Press SW1 to ear Morse
code. Connect a paddle to KEY jack, send a few codes and monitor t e side tone from eadp one.
Step 6: Local Oscillator
Install C23 (9-50 pF), C24 (9-50 pF)
Install Q1 (2N3904), Q4 (2N3906)
Install crystal X3 (Case grounding pad is reserved, but not used)
Install C1 (100 uF 25V). Note for polarity.
Install C4 (100 p), C15 (100 p), C16 (100 p)
Install SW1
Test: Apply power supply. Place t e board near a SSB or CW receiver's antenna. Tune t e
receiver around t e frequency of X3 to ear tone. Press SW1 and you will ear t e tone frequency
c ange.
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