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YouKits tj5a Operation Manual

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OPERATION GUIDE
TJ5A is a high sensibility, high-performance portable multi-band SSB/CW transceiver, used with
DDS as LO, offering wide frequency coverage and fine tuning rate. A signal of 0.1uV is
discernible with this transceiver. The Doubly Balanced Diode Ring Mixer makes strong signal
handling capability possible.
Features:
Low RX current Drain
High-Performance AGC
Large built-in speaker
40 Memories
Dual VFO's
Memory-VFO Transfer
Low power tuning up mode
USB socket for DigiPan
Band extending connector
Operating Frequency:
3.500000 – 4.000000
7.000000 – 7.300000
10.10000 – 10.15000
14.000000 – 14.350000
18.068000 – 18.168000
21.000000 – 21.450000
(With band extending module, 60m and 12m bands available)
Mode:
LSB, USB, CW, TUN
Tuning Rate:
10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz
IF:
9 MHz (Single conversion super-heterodyne)
Sensitivity:
0.3uV
Operating Power:
12 – 12.6 V
Physical Parameters (WHD):
180 x 58 x 200 mm
Weight: 1.5 kg (1.85 kg with 12 V 4.4 Ah Li-ion battery pack)
1

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Summary of Contents for YouKits tj5a

  • Page 1 OPERATION GUIDE TJ5A is a high sensibility, high-performance portable multi-band SSB/CW transceiver, used with DDS as LO, offering wide frequency coverage and fine tuning rate. A signal of 0.1uV is discernible with this transceiver. The Doubly Balanced Diode Ring Mixer makes strong signal handling capability possible.

  • Page 2: Current Drain

    Adjustable from 0.3 - 20 W Adjustable from 0.3 - 10 W (Can be adjusted to 20W) 10 - 20 mW (Can be set from 1 mW – 10 W) Output spurious: -50dB TJ5A’s transmit signal complies with the FCC spectral purity requirement.

  • Page 3: Front Panel

    Press the knob to select the tuning rate. The sequence is 10 Hz, 100 Hz, 1 kHz, 10 kHz, and 100 kHz. Power Indicator – The LED above the TUNE knob is green when TJ5A is turned on. It turns red in transmission.
  • Page 4 V / M – VFO / MEM switching. Press to switch between VFO and MEM. Turn TUNE to select the memory number. MEM – Frequency saving / MEM to VFO transfer. Press to save the frequency to the memory. Press MEM, the memory number appears. The dashes indicate the blank state of the memory. Turn TUNE to select the MEM position you want to store the frequency to.
  • Page 5 Let us study the following example: Transfer MEM00 (18.068 ) to the VFO B. Press MEM, and the following data is displayed: Select VFO B by pressing A/B button or rotating TUNE knob. Press MEM to transfer MEM 00. The following is displayed: Press V/M to enter VFO B.
  • Page 6 S-Meter/Power Meter: In receive the bargraph shows relative signal strength. Each bar represents one level. The second bar indicates a signal of 12uV is injected. In transmit the output power is also displayed. Each bar represents one level. The first bar indicates 3 Watts.
  • Page 7 Connectors MIC – MIC / CW key jack. Use 3.5mm stereo plug. The tip is PTT / KEY, the ring next to the tip is MIC; the sleeve close to the base GND. PH – Earphone / speaker 3.5-mm jack. Either earphones or speaker can be used. When the earphone or speaker is plugged in, the built-in speaker is disconnected.

  • Page 8: Battery Pack

    2. Connectors on Right Side USB – This connector can be connected to the computer sound card for DigiPan. DC 12V – DC power connection. The power connector uses two contacts. The left contact (facing the right side of the radio) provides the negative connection to the power supply. The right contact is the positive connection.

  • Page 9: Operation

    If you do not have the battery pack, use a DC 12V or 12.5 V power supply with the supplied plug. 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.
  • 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 Connect TJ5A’s PTT (the tip) to the PTT of the modem. First set up the rig. It is essential to have the modem Tx Audio drive level and TJ5A power level set properly. Use a dummy load on the transceiver to set up the rig for SSB operation at the normal power level (say 20 W).
  • Page 12 DigiPan The USB port on the right side of the rig is use for DigiPan. AF IN is connected to LINE or SPEAKR OUT (green) of the computer sound card. AF OUT is connected to MIC (pink) of the computer sound card. SERIAL PORT is connected to the computer 9-pin serial port, with GND connected to Pin 5, SERIAL PORT to Pin 7.
  • Page 13 5. CW Filter The optional CW filter is made up of high-pass and low-pass filters, which greatly improves the selectivity during CW reception. The filter is switched out in SSB operation. The filter is either solder to the filter socket (CN2) on the main board. If you have purchased the filter separately, remove the 104 capacitor from CN2, and solder the CW filter in the pads.

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