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CRKITS CRK-10 CW Manual

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CRK-10 CW Transceiver Kit Manual
Rev. B
CRKITS.COM
Oct 22, 2012
RockMite was introduced to China years ago by BD6CR/4. BD4RG, the designer of HB-1A and
HB-1B, improved the design by rewriting the firmware, increasing RF power output, and
smoothing the keying. The improved version is called Octopus in China, and already received good
reputation and popularity among Chinese QRPers. Now CRKITS.COM proudly introduces this kit
to the worldwide, and names it as CRK-10 CW Transceiver kit.
The RF output power is about 3 watt at 12V. Power supply range is 9-15V. TX current is about 500
mA, and RX current is about 15 mA (measured at 12V). The built-in MCU can generate side tone of
about 700 Hz, switch RX/TX, and act as a keyer for not only paddle (normal paddle or bug key
simulation mode), but also straight key.
The receiver is a direct conversion receiver, but the sensitivity is very high because of a two-pole
crystal filter in the receiver front-end and an audio filter, which block interference and filter out
background noise. The MCU automatically shifts TX frequency, generates side tone and acts as the
keyer, which makes the whole radio quite practical. The power supply polarity protection and the
high SWR protection make the radio durable.

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Summary of Contents for CRKITS CRK-10 CW

  • Page 1 HB-1B, improved the design by rewriting the firmware, increasing RF power output, and smoothing the keying. The improved version is called Octopus in China, and already received good reputation and popularity among Chinese QRPers. Now CRKITS.COM proudly introduces this kit to the worldwide, and names it as CRK-10 CW Transceiver kit.

  • Page 2: Parts Inventory

    Parts Inventory Most of the components of this kit are SMD parts and already pre-mounted by factory on PCB, so you will only need to solder about 20 through-hole parts including all the connectors and buttons. Part list is shown below. Item Quantity Value...
  • Page 3 Step by Step Building It takes about an hour to build and align the kit, so it is an ideal one-evening kit to give you some pure fun of kit building and QRP operation. Step 1: Toroids Winding Follow the picture to wind 10 turns for L2 and 12 turns for L3. They are parts of the low-pass filter to purify the transmitter output.
  • Page 4 Step 3: J1 and J2 Jumpers The J1 and J2 jumpers are used to swap dash and dot wiring. Here, we can refer to the diagram to solder two jumper wires. Note that straight key is only supported in one setting (but not the one shown in the picture below).
  • Page 5 Step 4: Capacitors C30, C31 Follow the picture to solder C30 and C31. C30 and C31 are parts of the audio filter. Step 5: Crystals X1, X2 and X3 Follow the picture to solder X1, X2 and X3. X1 and X2 form a 2-pole crystal filter in the front-end of the direct conversion receiver, while X3 is working as the oscillator for both the receiver and transmitter.
  • Page 6 Step 7: 3.5 mm Jack PHONE Follow the picture to install and solder PHONE jack. Low impedance (around 32 ohm) and high sensitivity stereo headphones are recommended here. Step 8: 3.5 mm Jack KEY Follow the picture to install and solder KEY jack. Both paddle and straight key are supported. Step 9: Inductor L1, L2 and L3 Follow the picture to solder L1, L2 and L3.

  • Page 7: Step 10: Dc In Connector

    Step 10: DC IN Connector Follow the pictures to install DC IN connector. Leave one side pin NOT soldered. The center or V+ marking means positive. 12~13.8V and at least 1A power supply is recommended. Step 11: Antenna Connector Follow the pictures to install the BNC type antenna connector. Step 12: Power Amplifier Transistor Follow the pictures to install the power amplifier transistor.
  • Page 8 Step 13: Thermal Pad / Insulator Follow the pictures to stick the thermal pad to the inner side of the rear panel, and fix the transistor to the rear panel by M3 screw and nut. Make sure the DC IN connector can be plugged in when you fasten the screw.

  • Page 9: Step 15: Final Assembly

    Step 15: Final Assembly Follow the pictures to slide the board to the case and finish the final assembly. Fix the rear panel and front panel by the 8 pcs flat head panel screws. Congratulations! You are done with your building and please enjoy some QSO's now.

  • Page 10: Operation

    Operation If an effective antenna is used, 3 watt RF power is good enough to make others heard. Although it is a QRP radio, you are encouraged to call CQ to be able to make more successful QSO's. Luckily you can use the push button to automatically call CQ.
  • Page 11 sec or 2, you will hear Morse code QRP. Release it and now auto CQ will add /QRP after the third time of your call sign. Repeat the above operation you will hear Morse code NO, and it means auto CQ will not add /QRP.

  • Page 12: Theory Of Operation

    Theory of Operation The MCU servers a controller and a keyer. It controls RX/TX switch, including receiver mute and transmit frequency shift. As a keyer, it reads the key input, keys the transmitter to send the signal and generate side tone as well. The receiver is a typical NE602 direction conversion receiver, with the exception that it only receives one frequency, so a 2-pole crystal filter is added in the front-end to block most of the broadcast interference out.

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