1 CRK-0A CW Transceiver Kit Manual Rev. A CRKITS.COM May 9, 03 Change History: May 9, 03: Initial release - Rev. A
2 Introduction Thanks for choosing CRK-0A CW Transceiver kit. It is a great one-evening project to provide you pure fun of both kit building and QRP operation. CRK-0A design is inspired by RockMite from Small Wonder Labs. RockMite was introduced to China years ago by BD6CR/4. BD4RG, the designer of HB-A and HB-B, improved the design by rewriting the firmware, increasing RF power output, and smoothing the keying. The improved version is called Octopus in China, and has already received a good reputation and popularity among Chinese QRPers. Previously, we introduced the SMD version 40 meter CW transceiver kit called CRK-0, and now we are glad to announce the through-hole version CRK-0A with improvements. The major changes from CRK-0: CRK-0 is a hybrid kit with all the SMD parts pre-mounted and about 0 pcs through-hole parts to install, but CRK-0A is a pure kit with all through-hole parts to install. CRK-0 supports 40 meter band only, while CRK-0A supports 40 meter or 30 meter band. CRK-0A removes the paddle dot/dash wiring jumpers, and adds a push button to confirm the side band of the incoming signal CRK-0A follows KN-Q7A style to use PCB panels, provides IC sockets and case feet to make it a more complete and good looking kit The CRK-0A specifications follow CRK-0 that the RF output power is about 3 watt at V (slightly lower for 30 meter band). Power supply range is 9-V. TX current is about 00 ma, and RX current is about ma (measured at V). 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 and selectivity are 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. Disclaimer We offer the kit as is and do not guarantee the assembled kit by yourself can meet your local regulatory requirements, including spurious, environmental or others. As some parts used in the kit are obsolete, we cannot guarantee that all the components in the kit are brand new, but we bear the responsibility of providing them as good as possible.
3 Parts Inventory Follow the part list below to do parts inventory first. Please note the difference between 30 meter kit and 40 meter kit. If there are any missing parts or questions, please contact your local distributor or CRKITS.COM directly by at Item Quantity Value Comments R3, R8 00 R, R3 0 R8, R4 k R, R9. k R6, R k R0, R, R6, R4 k R7, R0 33 k R 47 k R4, R 3 0 k R7, R9, R. M R, R3 Capacitor, ceramic 3 33 p C7, C, C6 Capacitor, ceramic 6 p (30 m) or 00 p (40 m) C9 Capacitor, ceramic 6 00 p C4, C, C6, C, C34, C3 Capacitor, ceramic 0 p (30m) or 470 p C6, C8' (40 m) Capacitor, ceramic 470 p (30m) or 000 p C8, C0 (40 m) Capacitor, ceramic uf C3, C~C4, C7, C9, C Capacitor, ceramic 0.0 uf (30 m) or leave it not installed (40 m) C Capacitor, ceramic 7 0. uf C, C, C8, C0, C7~C9 Capacitor, trimmer 9-0 pf C3 (for TX), C4 (for RX) Capacitor, electrolytic 0 uf V C33 Capacitor, electrolytic 00 uf V C, C3 Capacitor, polyester film 0.0 uf, A03J C30, C3 Diode 7 N448, glass body D, D4, D~D9 Diode N87, black D Diode N47A, silver D3 Regulator IC 78L0 78L0 IC socket 3 8-pin 8-pin
4 IC, balanced mixer NE60 IC IC, op amp NE3 IC IC, MCU F69, programmed IC3 Transistor N3904 Q, Q Transistor N3906 Q4 Transistor N440 Q Field Effect Transistor J309 Q3 Power Amp. transistor SC6 Q6 Inductor, fixed 0 uh L Inductor, toroid T37-, red L (0 turns), L3 ( turns) Enamel wire 0.4m 0.38mm diameter For L and L3 winding Push button PCB mount SW, SW 3.mm jack 3. mm stereo type PHONE, KEY DC IN connector. mm type +V Crystal , 7.00, 7.0, 7.030, 0.06 or 0.30 MHz X, X, X3 Thermal pad / insulator TO-0 type With back paste, stick to inner side of the rear panel plated area M3x8 screw M3x8, black, pan head For fixing SC6 M3 nut M3, black For fixing SC6 Antenna connector BNC, PCB mount ANTENNA, with washer and nut M.x6 panel screw 8 Black, pan head For front and rear panels Case CRK-0, black With front and rear panels PCB CW-DC-P
5 Step by Step Building It takes about. hours to build and align the kit. You will need to prepare basic soldering and alignment tools to be able to build this kit. Step : s Stuff all the resistors, solder and cut the extra leads. If you are not sure about the color codes, you can use an ohm meter to verify value before you solder. First 3 colors are listed. If necessary, use an ohmmeter to verify value. R3, R8 (Red, red, black) R, R3 00 (Brown, black, brown) R8, R4 0 (Red, red, brown) R, R9 k (Brown, black, red) R6, R. k (Red, red, red) R0, R, R6, R4 4.7 k (Yellow, violet, red) R7, R0 k (Red, red, orange) R 33 k (Orange, orange, orange) R4, R 47 k (Yellow, violet, orange) R7, R9, R 0 k (Red, red, yellow) R, R3. M (Red, red, green)
6 Step : Diodes Stuff all the diodes. Note for the polarity. Solder and cut the extra leads. D, D4, D~D9 N448, glass body D N87, black D3 N47A, silver
7 Step 3: Ceramic capacitors, regulator IC and IC sockets Install all the 0.0 uf (03) and 0. uf (04) ceramic capacitors. C is only required for 30 meter kit. C3, C~C4, C7, C9, C 0.0 uf C 0.0 uf (30 m) not installed (40 m) C, C, C8, C0, C7~C9 0. uf Install the DC IN socket. If it is a bit protruding outside of the board edge, press it towards inside then solder. Install 78L0 regulator IC. Make sure the outline is aligned. Install 3 pcs IC sockets. Make sure the notches are aligned. Test: Apply power supply of 9- V DC, center positive, measure V at pin 8 of IC.
8 Step 4: Audio filter and amplifier Install Q3 (J309). Note for static sensitive part. Handle with care. Install C3 (00 uf V) and C33 (0 uf V). Note for polarity. Install C30 and C3 (polyester film 0.0 uf, A03J). Install C (00 p). Install PHONE jack. Insert IC (NE3). Note for orientation. Test: Apply power supply, and connector a headphone to PHONE jack. Use tweezers to touch pin 4 of IC and hear noise.
9 Step : MCU Install KEY jack Install SW Install C6 (33 p), C34 (00 p) and C3 (00 p) Insert IC3 (F69). Note for orientation. Test: Apply power supply, and connect a headphone to PHONE jack. Press SW to hear Morse code. Connect a paddle to KEY jack, send a few codes and monitor the side tone from headphone.
10 Step 6: Local Oscillator Install C3 (9-0 pf), C4 (9-0 pf) Install Q (N3904), Q4 (N3906) Install crystal X3 (Case grounding pad is reserved, but not used) Install C (00 uf V). Note for polarity. Install C4 (00 p), C (00 p), C6 (00 p) Install SW Test: Apply power supply. Place the board near a SSB or CW receiver's antenna. Tune the receiver around the frequency of X3 to hear tone. Press SW and you will hear the tone frequency change.
11 Step 7: Transmitter and Board Complete Follow the picture to wind 0 turns for L and turns for L3. They are parts of the low-pass filter to purify the transmitter output. Scratch the enamel of wire endings and tin them well. Install Q (N3904), Q (N440). Install crystals X, X (Case grounding pad is reserved, but not used) Install L (0 uh), L (0 turns) and L3 ( turns). Install C6 (0 p (30m) or 470 p (40 m)), C7 (33 p), C8 (0 p (30m) or 470 p (40 m)), C8' (470 p (30m) or 000 p (40 m)), C9 (6 p (30 m) or 00 p (40 m)), C0 (470 p (30m) or 000 p (40 m)), C (33 p). Install antenna connector ANT. Insert IC (NE60). Note for orientation. Follow the pictures to install the power amplifier transistor Q6 (SC6). Keep the pin about 4 mm above the board, and only solder one pin first.
12 Note: Schematic here is only for 40 m. Refer to the schematic for 30 m at the end of this document. Test: Apply power supply, connect a dummy load of 0 ohm at least watts. Place a SSB/CW receiver nearby and tune to around the frequency of X, X or X3. Press SW to monitor the Morse code by leakage from dummy load. If your power supply has current meter, check if it draws about 00 ma. Disconnect the dummy load and connect to a resonant antenna, you should be able to hear some band noise.
13 Step 8: Thermal Pad / Insulator Split the panel board to two halves. Cut thermal pad about 3~4 mm as shown. Follow the pictures to stick the thermal pad to the inner side of the rear panel, and fix Q6 (SC6) to the rear panel by M3 screw and nut. Make sure the DC IN connector can be plugged in when you fasten the screw. Then solder all the pins of Q6 (SC6) and trim the leads.
14 Step 9: Ready for Alignment Follow the following alignment section to align the radio, before final assembly. It is preferred that you have a power supply of ~3.8V with short circuit protection. Connect the power supply to the CRK-0A to see if it works. The overall receive current should be about ma. Disconnect the power supply, connect a headphone, a paddle and an antenna or a 0 ohm dummy load, then connect the power supply again, you should hear dot dash. Touch the antenna connector center pin with tweezers, and you should hear some clicks. It means the receiver works. Now proceed to TX alignment. Enter the straight key mode and press and hold the key to see if the overall current is about 00 ma. If it is, it means the transmitter works. Use a commercial amateur radio to transmit a CW tone at the specified frequency, and adjust the capacitor trimmer C4 to make the receiver frequency exactly on the specified frequency (the tone from the headphone is loud and clear, within 700~800 Hz range). Adjust the capacitor trimmer C3 to make the transmit frequency exactly to the specified frequency.
15 Step 0 : Final Assembly Follow the pictures to slide the board to the case and finish the final assembly. Note that the bottom side of the case has two lines, while the top side is flat. Fix the rear panel and front panel by the 8 pcs pan head M. panel screws. Stick four rubber feet on the bottom side of the case. Congratulations! You are done with your building and please enjoy some QSO's now.
16 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. Sometimes, you can hear a station well, but no matter how you call him, he just cannot hear you. It's normally because he is on the wrong side band. Push button SW (CFM) is used to confirm that while in RX. After pressing SW and the tone of the signal of interest gets very low or even not heard, the signal is on the right side band, and likely he can hear you when you call back. If the tone gets higher, the signal is on the wrong side band, and unless his receiver bandwidth is wide enough, he will not likely hear you. Everything else is straightforward but the keyer operation, which will be addressed below. The human-machine interface is made by the push button SW, a paddle and a headphone. All parameters will be stored in the MCU, and it will not be lost after power down. Paddle or Straight Key Keyer Mode Switch The MCU automatically detects paddle or straight key, as long as you plug in the key before power on. The mechanism is that the MCU detects if the ring of the 3. mm stereo plug (pin 3 of the MCU) is permanently short with the shield (ground) or floating. For straight key, it is short. For paddle, it is floating. If you hear Morse code A (Automatic) after power on, it means a paddle is detected and it works in normal paddle mode; Morse code B (Bug) means a paddle is detected and it works in bug key simulation mode; and Morse code M (Manual) means a straight key is detected and it works in straight key mode. Auto CQ Briefly press SW button and it automatically send CQ CQ CQ DE + your call three times + K. If you want to stop the auto CQ, press and hold SW button for sec and release. Speed Adjustment Press SW button for more than sec, you will hear Morse code S (speed). Release it and adjust the keying speed by paddle within 8 sec (or it automatically exits to keep the original speed). Press dot will increase the speed, and press dash will decrease the speed. Briefly press SW button and you can hear Morse code E to confirm exit, or wait about 8 sec to automatically exit. Call sign Input Press SW button for about sec, you will hear Morse code S (speed). Keep pressing for another sec, you will hear Morse code I (input). Release it and input your call sign (up to 0 character) just like you make QSO with your paddle within 8 sec (or it automatically exits to keep the original call sign). Briefly press SW button and you can hear Morse code E to confirm exit, or wait about 8 sec to automatically exit. Paddle Mode Selection (Normal Paddle/ Bug Simulation) Press SW button for about sec, you will hear Morse code S (speed). Keep pressing for another sec, you will hear Morse code I (input). Keep pressing for another sec, you will hear Morse code M (mode). Release it and send dot by your paddle, you will hear Morse code NOR, and the radio will be chosen to work in normal paddle mode. If you send dash by your paddle, you will hear
17 Morse code BUG, and the radio will be chosen to work in bug simulation mode. In bug simulation mode, dots will be sent automatically by the MCU and dashes will be sent manually. Note that the keyer does not actually support mechanical bug key. Adding /QRP You can choose to add /QRP or not in auto CQ. Press SW button and power on the radio, you will hear normal Morse codes (A or M or B) to indicate working mode. Keep pressing SW button for sec or, 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.
18 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 NE60 direction conversion receiver, with the exception that it only receives one frequency, so a -pole crystal filter is added in the front-end to block most of the broadcast interference out. The NE3 op-amp serves as an audio filter and amplifier to drive a headphone. Q3 J309 is controlled by the MCU to mute the receiver in transmit. The transmitter chain is simple. N3904 is the oscillator. C4 controls the receiver frequency and C3 in parallel of C4 control the transmit frequency. N440 is a buffer amplifier and it is also a keying circuit. The power amplifier is SC6. The LPF filters the transmit harmonic signals. Schematic of 40 meter version
19 Schematic of 30 meter version Troubleshooting If the receive current is much higher than ma, it means the circuit has issue. Inspect all the components to make sure they are installed properly, especially the components with polarity such as electrolytic capacitors, and IC orientation. If all the components are installed properly but the symptom persists, most likely it is because of the PCB short. Please inspect carefully and cut the short circuit trace by a knife. You can also refer to the following voltage chart to help you find the issue. If the voltages of one IC is abnormal, normally you can check the IC itself or its peripheral components. Reference voltage on each IC: (Power supply V, measured in RX mode) Pin IC IC IC
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