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YouKits TJ5A Manual To Alignment

Ssb cw hf transceiver
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See also: Operating Manual
Youkits TJ5A SSB CW HF TRANSCEIVER
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 and high-performance fast AGC make strong signal handling capability
possible. With the high-performance IF AMP, TJ5A features extremely low background
noise reception.
TJ5A is a fully tested, almost ready-to-use kit. What you are required to do is trim the BFO,
calibrate DDS clock, and set up IF and USB settings.
IMPORTANT. Before calibrating BFO or DDS, please warm up both the frequency
counter and TJ5A for 20 minutes for more accurate result.
BFO has been calibrated without the warming-up step before shipping. If you do not have
a frequency counter, you may ignore this step. However, there would be a frequency
tolerance of around 50Hz.
Now, remove the related screws and open the upper cover of TJ5A.

BFO Calibration

Before calibrating the BFO, first make sure that the RIT control is at the zero position.
Follow the following steps.
1) Set PWR knob to the lowest level.
2) Use a digital multi-meter to measure the voltage between the center pin of CN5 and
GND (the screws on the four corners of the main board can be regarded as GND).
3) Press PTT, and observe the reading. Take down the reading (around 4.36V). Now
Guide to Alignment of TJ5A

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Summary of Contents for YouKits TJ5A

  • Page 1 With the high-performance IF AMP, TJ5A features extremely low background noise reception. TJ5A is a fully tested, almost ready-to-use kit. What you are required to do is trim the BFO, calibrate DDS clock, and set up IF and USB settings.
  • Page 2 release PTT, and observe the reading. Rotate RIT knob until the reading is the same as the reading taken while PTT is pressed. This is the zero position of RIT. Now, let us calibrate BFO. Connect the frequency counter to TP2. Set MOD to LSB first. Observe the reading. It is around 8.998500MHz.
  • Page 3 Important: BFO and DDS calibration should be carried out after the required warming-up period of the frequency counter and TJ5A. Leave the frequency counter and TJ5A running for 20 minutes before calibrating BFO and DDS. A high quality, accurate frequency counter should be used to ensure the accurate DDS output frequency.

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