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CONSTRUCTION OF TJ2B HANDHELD SSB TRANSCEIVER

The TJ2B is a high-performance QRP portable multi-band SSB transceiver using DDS as
the LO, and offering wide frequency coverage and fine tuning rate.

The Doubly Balanced

Diode Ring Mixer makes strong signal handling capability possible. The TJ2B is a
pre-assembled kit. You need only assemble a few parts and connect some cables to be
qrv.

Operating Frequency: 3 - 18.2 MHz (Kit A)

Mode: LSB, USB, CW (RX)

Tuning Rate: 1Hz, 10Hz, 100Hz, 1KHz, 10KHz, 100KHz
IF: 9 MHz
Sensitivity: 0.3uV
Current Drain: 260 mA (RX)
Operating Power: 10 - 13.6V
Output Power: 5W
40 Memories
Dual VFO

Memory-VFO Transfer

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Содержание TJ2B

Страница 1: ...lanced Diode Ring Mixer makes strong signal handling capability possible The TJ2B is a pre assembled kit You need only assemble a few parts and connect some cables to be qrv Operating Frequency 3 18 2...

Страница 2: ...of 1 Hz are available Pressing the TUNE knob selects the tuning rate Included Hardware Buttons switches DC sockets earphone socket pot and encoder A miniature speaker is packed in the bottom cover of...

Страница 3: ...Cables for internal connections Components package...

Страница 4: ...Toroids Note FB 43 2401 may be supplied in the kit This core is larger than FT 43 37 Can Inductors...

Страница 5: ...Pre assembled Miniature Transformers Packed in a separate plastic bag Brass Stand Off Parts...

Страница 6: ...y However some bulkier components such as the buttons switches can transformers toroids electro caps have not been assembled Thess components prone to damage in transpiration if they were pre assemble...

Страница 7: ...rwise it will be too high 2 Assemble MIC Notice the Ground pin the pin connected to the casing Solder the GND pin of the MIC to the GND pad of CN6 the square pad on the left and solder the MIC pin to...

Страница 8: ...the socket a little so as to align with the opening better It takes only 2 or 3 minutes First cut off the 5 tiny plastic stands off on the socket Second flatten the plastic rim with a file See the il...

Страница 9: ...e transformer to T1 pads Six such transformers are supplied in the bag Use one of them here 6 Insert the LCD cable to the FFC socket CN3 Do not assemble the buttons until the LCD is assembled Bend the...

Страница 10: ...How to insert the LCD Cable Never bend the cable end soldered to the LCD...

Страница 11: ...d because the thin tracks have no protecting plastic at the end Always push the bent part the U part to insert Another method of inserting the LCD is to insert the LCD with a slanted angle Fasten two...

Страница 12: ...Now solder the 7 wire cable...

Страница 13: ...the contrast control VR1 until the display appears The 51 ohm resister controls backlight brightness Now push the LCD window through the LCD frame Fasten the frame with 2 flat head screws A little gl...

Страница 14: ...er side of the PCB making it easier to run the cable Pins 1 3 are soldered to encoder pins 1 3 respectively Pins 4 5 are soldered to the two encoder switch pins The encoder pins are numbered as shown...

Страница 15: ...rity Power supply range is 10 5 13 6V If there isn t any display after adjusting VR1 please check the LCD cable The cable may only be half way into the connector Insert the cable properly For the firs...

Страница 16: ...DS unit Press the SETUP button IFS appears on the screen Setup IFS later Press again DDS information appears The top line indicates the clock value The default clock value is 100000000 100 MHz Use the...

Страница 17: ...s kit the BFO frequency at LSB mode is 8 998400 MHz not 9 00000 MHz 900000 8998400 1600 i e 1 6 kHz The DDS should be 1 6kHz lower to match the LCD display Please turn the TUNE control counter clockwi...

Страница 18: ...relays Notice the bar printed on the relay There is also a bar printed on the PCB 7 220uF electrolyte caps Note The longer lead is Solder them to C28 C30 C80 C82 pad Find on the PCB Never mistake the...

Страница 19: ...ce symbol 8 Solder the 9 MHz crystals on main board Y1 Y5 pads 9 Solder the can inductors to the main board The can without any number is for T4 the can labeled 3 is for L2 and the can labeled 2 is fo...

Страница 20: ...10 Solder T1 T2 T3 T5 T6 These are miniature transformers One of them is used on the DDS Unit 11 Assemble the 10k trimmer on the CN2 pads Adjust the leads so that they fit the pads...

Страница 21: ...irection of this variable cap 13 Solder the 10uF chip at C27 if a capacitor is not already present Notice the polarity The brown bar is If the SMT chip is too small for you to handle you can use an or...

Страница 22: ...o remove the emanel with a knife and then tin Never use fire to burn the wire to remove the emanel L12 L13 40m LPF inductors 17 turns 0 42 wire on T37 2 core leaving 1 cm for the leads A length of 22c...

Страница 23: ...is wire B Connect 2 the finish of wire A with 3 the start of wire B as the tap Use Ohm meter to identify each wire You don t have to twist the wire Leave about 1 cm for each lead Remove about 5 mm en...

Страница 24: ...T7 is soldered on the 3 lead pads with the tap in then middle pad No connection on the 2 pin lpads...

Страница 25: ...Cut 2 pieces of 15 cm long enameled wires wire A and wire B Twist the 2 wires before winding Connect 2 the finish of wire A with 3 the start of wire B as the tap Use an Ohm meter to identify Leave abo...

Страница 26: ...8 Assemble the bias resistor of the power transistor R62 19 Assemble D18 on then PCB back Solder a 100 ohm resistor on the leads of D18 i e the resistor is paralleled with D18 20 Put a jump wire in JP...

Страница 27: ...B back 22 Next construct the power transistor assembly First bent the transistor leads Put the insulating bush into the transistor heat sink mounting hole Place the mica insulator sheet between the tr...

Страница 28: ...k collector There should be no reading If the reading is 0 ohms this indicates a short circuit between the transistor and the aluminum plate Check the insulating bush You may have placed it in the wro...

Страница 29: ...Use two 2 mm spring washers for each screw The thickness of the 2 stacked springs is almost that of the speaker rim Place 2 spring washers and then a shim Lock with the nut...

Страница 30: ...in appropriate length a length of 90 mm is enough and solder the 2 wire cable to the speaker pads Assemble the black connector to the cable Assemble the DDS Unit to the enclosure The stands off are pr...

Страница 31: ...ings Press the buttons They should be running fit Tighten the assembly with 4 10mm stands off Use 1 washer and 1 spring washer so that the stand off is raised 1mm Tighten the stand off Split the sreen...

Страница 32: ...in the leads and solder to DDS CN4 and MAIN CN1 center inductor to the center hole screen to the any 2 holes of the the 4 holes Solder the 3 wire cable to the AF GAIN 10k pot Notice the GND pin Cut th...

Страница 33: ...the cable to CN3 3 Testing the Rig Five components need adjusting They are T4 L2 VC1 10k variable on CN2 and L3 Pug the 7 pin ribbon cable to CN5 speaker cable to CN6 Plug in the encoder The MIC cabl...

Страница 34: ...uency Measure BFO at left side of C40 insert a 470 ohm resistor between the test point and the probe to minimize the pulling This resistor value is not very critical any value from 220 ohm 1k Press MO...

Страница 35: ...50 ohm cable and MIC cable are connected How the cable is soldered...

Страница 36: ...pick up the beacon signal at 10MHz and 15MHz 4 Align the IF trap L3 is a trap coil which eliminates the 9MHz leakage When the slug is at the same level with the metal case it is almost in the position...

Страница 37: ...See how to arrange the 5 wire ribbon cable...

Страница 38: ...sten the encoder AF GAIN POT ANT socket to the top cover but do not assemble the cover to the enclosure Slantly slide in the main board with the power switch handle aligned with the opening on the sid...

Страница 39: ...because of the DC12V socket Pull the enclosure edge and press the main board at the same time so that the main board goes into the enclosure The ANT socket tail may be a little longer Cut the tail to...

Страница 40: ...Don t forget to solder ANT leads Assemble the two brass stands off with a tai to the mounting holes...

Страница 41: ...ded in the 2 top mounting holes Now put on the PTT button Plug in the DC cord and connect the antenna Switch on the power Does the rig work Yes OK Press PTT and talk to the MIC Output power can be obs...

Страница 42: ...Assemble the bottom cover The last step How to place the battery The battery pack optional is placed on the back cover with 2 pieces of adhesive tape It...

Страница 43: ...ch as the can inductor leads CN4 leads Stick 3 or 4 pieces of thicker tape on the main board Place a piece of thin hard card between the tape and the battery to prevent it from touching the main board...

Страница 44: ...re plugging in the external MIC The tip is MIC the narrow ring is PTT and the inner conductor is GND AF GAIN Volume control Turn clockwise to increase volume TUNE Frequency tuning knob Tuning rate sel...

Страница 45: ...state press MEM VFO appears on the left corner For example VFO A may appear on the left corner Press A B to select the VFO you want to transfer the memory to Press MEM the frequency in the memory wil...

Страница 46: ...s rather soft BFO calibration There is the possibility that the BFO frequency cannot be adjusted to 8 99840MHz The highest is 8 9980MHz Never mind Use 8 9980MHz as LSB In this case USB frequency shoul...

Страница 47: ...open the back cover 2 Remove the two screws to fasten the aluminum plate Lift the aluminum plate a little until you can reach the two brass stands off and remove the stands off Remove the screws that...

Страница 48: ...p from one side ready to be pulled out 7 DC cable The wire labled white dash is the center i e the other However please use the ohm meter to confirm The bush should be connected to the center to never...

Страница 49: ...same except the following 1 L3 is not necessary No 2 can inductor is not supplied in the kit 2 C50 is a pre assembled cap 3 T8 Broadband transformer 4 turns 4 L12 L13 15m LPF inductor 10 turns 5 L14 L...

Страница 50: ...ed signal Use 100 KHz tuning rate to get to that frequency faster While you tune from 3 MHz 8 998000 MHz you may notice a sudden mute received noise level drops suddenly this silence is where the trap...

Страница 51: ...C14 are working Move the antenna to C13 the same level will be heard Move to C9 the sound should be much smaller because of the XTL filter Move to C5 the sound level should be the same as C9 Move to...

Страница 52: ...should be used In our case 1s button is to be used to obtain the reading in Hz 10MHz and 100MHz buttons are for CH1 Use 10MHz button since the DDS output frequency is 12 000000MHz However different fr...

Страница 53: ...e to the tolerance of the 100MHz clock the reading might not be 12000 000 It might be a liittle lower than that When you move to higher bands the situation might be much worse It is necessary to calib...

Страница 54: ...oint of BFO DO NOT forget to insert a resistor between the clip and the test point to reduce the effect from the frequency counter input The resistor value ranges from 470 ohms 2 2k depending on your...

Страница 55: ...greater value say 1k or 2 2k even 4 7k if you can take a stable reading 2 The crystal group is different Try to use 8998 000 as LSB 9000 800 as USB In this case the IF setting of DDS Unit is 2000 not...

Страница 56: ...0Hz for a try Repeat the process until both the lowest and highest frequencies are 12 000000 and 27 199999 respectively With 8 digit frequency counter it is not easy to find the small frequency error...

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