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YouKits TJ5A Operation Manual

Ssb/cw transceiver
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Youkits TJ5A SSB CW HF TRANSCEIVER
IMPORTANT!
Never try the long key at the full power output. This would overheat the power
transistors.Always use half or lower power to tune the tuner.Use the matched high
efficient antenna such as the dipole, V-dipole, Yagi, long wire with a tuner. Low
efficient antenna, such as small loop, short whip, the shortened wire of a few
meters, etc. are not recommended, which would degrade the sensitivity of TJ5A,
and lower audio output.
OPERATION GUIDE
TJ5A is a high-performance portable multi-band SSB/CW transceiver, used with DDS as
LO, offering wide frequency coverage and fine tuning rate. The Doubly Balanced Diode
Ring Mixer makes strong signal handling capability possible.
Features:
Removable Battery Pack
Low RX current Drain
High-Performance AGC
40 Memories
Dual VFO
Memory-VFO Transfer
Operating Frequency:
Wide Band RX
2.500000 - 29.999990
TX / Ham Band RX
7.000000 – 7.300000
14.000000 – 14.350000
18.068000 – 18.168000
21.000000 – 21.450000
1

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Summary of Contents for YouKits TJ5A

  • Page 1 V-dipole, Yagi, long wire with a tuner. Low efficient antenna, such as small loop, short whip, the shortened wire of a few meters, etc. are not recommended, which would degrade the sensitivity of TJ5A, and lower audio output.
  • Page 2 Mode: LSB, USB, CW Tuning Rate: 100Hz, 1kHz, 10kHz, 100kHz, 1MHz IF: 9 MHz Sensitivity: 0.3uV Operating Power: 10.5 – 12.5V Current Drain: MODE CURRENT 260 mA Output Power: MODE OUTPUT 0.1 – 20W 40m, 20m, 17m: 0.1 – 10W; 15m: 0.1 – 5W 1.
  • Page 3 A / B - VFO selecting / Memory clearing. Press to select VFO A or VFO B. In MEM state, hold the button until all the memories are cleared. V / M - VFO/MEM switching. Press to switch between VFO and MEM. Turn TUNE to select the memory number.
  • Page 4 How to transfer the frequency in MEM to VFO A or B? First, press V/M to enter MEM state. Second, press MEM to find the VFO’s. Now VFO A or B appears on the left corner on LCD. (A or B depends on which VFO is in use before pressing V/M. Third, press A/B button or rotate TUNE knob to select the VFO you want to transfer the memory to (either A or B).
  • Page 5 Sockets KEY – CW key socket. Use 3.5mm stereo plug. The ring is KEY; the sleeve is GND. The tip has no connection. PH - Earphone/speaker 3.5 mm socket. Either earphones or speaker can be used. When the earphone or speaker is plugged in, the speaker in MIC is disconnected. The tip and ring are in parallel.
  • Page 6 The speaker can be connected to either the tip or the ring, since tip and ring are in parallel. Never use the 3.5mm mono type plug. The long plug sleeve short-circuits the ring connection. Do not connect the speaker with the amplifier to PH socket with an ordinary cable. In this case a cable with attenuating network is required.
  • Page 7 3. Socket on Back DC IN - External power supply and battery socket IMPORTANT! The power supply socket on the back (DC IN) has three pins: the “+” pin (left) and “-”pin (right). The pin in the middle is also “-” pin which is for battery operation. For DC12.5V external power supply operation, use the 3-pin connector.
  • Page 8 If you do not have the battery pack, use a DC 12.5 V power supply (The battery pack is optional. Not included in the rig). Warming-up time It takes about 5 -10 minutes for the TJ5A to stabilize. A drift of 10 – 20 Hz might be noticed during the warming-up period. To receive signal Connect the antenna and turn on the power.
  • Page 9 However, ham-band receiving only is possible by re-arranging the jumper caps on the main board. Open the upper cover of TJ5A, the jumper caps are easy to find. Remove the caps from JP3 and JP4. Place the caps on JP1 and JP2 to select ham band receiving. In this case, TJ5A operates in 4 ham bands only: 40, 20, 17, and 15 meter segments.
  • Page 10 Use the matched high efficient antenna such as the dipole, V-dipole, Yagi, long wire with a tuner. Low efficient antenna, such the small diameter loop, short whip, the shortened wire of a few meters, etc. are not recommended, which would degrade the sensitivity of TJ5A, and lower audio output.
  • Page 11 The optional auto-switched-in CW filter is made up of 300 Hz high-pass and 720 Hz low-pass filters, which greatly improves the selectivity during CW reception. The filter is switched out in SSB operation. The filter is fastened on the back of the DDS board by means of a brass stand-off. Youkits 12/12...