Malahit ATU-100 Automatic Antenna Tuner 1.8-50 MHz 100W Shortwave User Manual

Introduction

This manual provides detailed instructions for the Malahit ATU-100 Automatic Antenna Tuner. This device is designed to automatically match the impedance of your antenna system to your transceiver, ensuring efficient power transfer across the 1.8-50 MHz frequency range with up to 100W of power. Please read this manual thoroughly before operating the device.

Package Contents

Verify that all items listed below are included in your package:

• 1 x Assembled Malahit ATU-100 Automatic Antenna Tuner (metal casing, no battery included)
• 1 x DC 5.5 x 2.1 Power Cable (0.75 square pure copper wire, 50 cm length)
• 1 x USB 5V to 9V Booster Board

Image: The Malahit ATU-100 tuner, power cable, and USB booster board as packaged in the box.

Product Features

• Firmware Version 3.2: Equipped with the latest firmware, version 3.2, which includes bug fixes and improvements over previous versions.
• Automatic Operation: This antenna tuner operates automatically, requiring no manual assembly or complex setup. It is ready for immediate use.
• Compact Design: The tuner features a compact and robust design with an assembled metal casing, making it durable and portable.
• High-Quality Components: Built with high-quality SMD capacitors, C-channel capacitors, 1000V high-voltage SMD capacitors, and an imported PIC chip for reliable performance.
• UHF Connector: Utilizes standard UHF connectors for antenna and radio connections.
• Durable Construction: The entire casing is made from CNC-perforated aluminum alloy, ensuring high durability.

Image: Front view of the ATU-100 tuner, showing the display, Tune button, Auto button, BYP button, and Power switch.

Setup

1. Power Connection: Connect the provided DC 5.5 x 2.1 power cable to the DC12V input port on the rear of the ATU-100. Ensure the power source provides 10-15 VDC. If using the USB 5V to 9V booster board, connect it to a 5V USB power source and then to the tuner's DC input.
2. Antenna Connection: Connect your antenna to the "ANT" UHF connector on the rear of the tuner.
3. Transceiver Connection: Connect your transceiver's antenna output to the "RF IN" UHF connector on the rear of the tuner.
4. Power On: Flip the red "POWER" switch on the front panel to the ON position. The display will illuminate.

Image: Rear panel of the ATU-100, illustrating the antenna (ANT), DC 12V power input, and RF input (RF IN) connections.

Operating Modes

The ATU-100 features several operating modes:

• Automatic Mode: When a dot ('.') appears on the display, the tuner is in automatic mode. In this mode, the tuner automatically adjusts to achieve the lowest SWR.
• Bypass (BYP) Mode: When a dash ('_') appears on the display, the tuner is in BYP mode, meaning it is bypassed and not actively tuning.
• Manual Mode: When both the dot and dash disappear from the display, the tuner is in manual mode, allowing for manual adjustments.

Tuning Process:

1. Ensure the tuner is powered on.
2. Transmit a low power signal (e.g., 5-10W) from your transceiver.
3. Press the green TUNE button. The tuner will automatically adjust the inductance (L) and capacitance (C) to minimize SWR.
4. Once tuning is complete, the display will show the SWR value.

Advanced Operating Modes (Test and Fast Test)

• Test Mode: To enter Test Mode, press and hold both the BYP and AUTO buttons simultaneously, then power on the device. This mode is used for diagnostic purposes.
• Fast Test Mode: To enter Fast Test Mode, press and hold the TUNE, BYP, and AUTO buttons simultaneously, then power on the device. This mode provides a quicker diagnostic check.

Image: A page from the ATU-100 manual illustrating the display indicators for Automatic, Bypass, and Manual modes, along with instructions for Test and Fast Test modes.

Power Supply and Booster Board

The ATU-100 requires a 10-15 VDC power supply. A DC 5.5 x 2.1 power cable is included. For users who need to power the device from a 5V USB source, a USB 5V to 9V booster board is provided.

USB 5V to 9V Booster Board Instructions:

1. Connect the booster board to a 5V USB power source using a USB cable (not included).
2. Solder the 5.5 connector power cable (included) to the booster board's output terminals.
3. Connect the 5.5 connector to the ATU-100's DC12V input.

Voltage Regulation Method:

To adjust the output voltage of the booster board:

• Locate the potentiometer on the booster board.
• Turn the potentiometer clockwise to increase the voltage.
• Turn the potentiometer counter-clockwise to decrease the voltage.
• If the output voltage does not adjust initially and remains at the input voltage, rotate the potentiometer counter-clockwise more than 10 turns before attempting to adjust it normally.

Booster Module Characteristics:

• Maximum Output Current: 2A
• Input Voltage: 2V-15V
• Maximum Output Voltage: >5V-28V
• Efficiency: >93%

Important Notes:

• Input voltage should not exceed the maximum input voltage.
• Peak current output should not exceed 2A.

Image: Instructions and diagram for connecting and adjusting the USB 5V to 9V booster board.

Specifications

Maintenance

To ensure the longevity and optimal performance of your ATU-100 tuner, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the exterior of the device. Avoid using abrasive cleaners or solvents, which can damage the finish.
• Environmental Conditions: Operate and store the tuner in a dry environment, away from direct sunlight, extreme temperatures, and high humidity.
• Connections: Periodically check all cable connections (power, antenna, RF IN) to ensure they are secure and free from corrosion.
• Firmware Updates: Check the manufacturer's website for any available firmware updates. Follow the provided instructions carefully for any update procedures.

Troubleshooting

If you encounter issues with your ATU-100 tuner, consider the following common troubleshooting steps:

• No Power:
  • Ensure the power cable is securely connected to both the tuner and the power source.
  • Verify that the power source is providing the correct voltage (10-15 VDC).
  • If using the USB booster board, confirm it is correctly connected and providing adequate voltage. Check the potentiometer adjustment.
• High SWR After Tuning:
  • Ensure your antenna system is properly connected and functional.
  • Verify that the power output from your transceiver is within the tuner's operating limits (1-100W for tuning).
  • Try re-tuning the antenna.
  • Inspect antenna cables and connectors for damage.
• Tuner Not Responding:
  • Power cycle the device (turn off, wait a few seconds, then turn on).
  • Ensure no buttons are stuck.

If problems persist, consult the manufacturer's support resources or a qualified technician.

Warranty and Support

The Malahit ATU-100 Automatic Antenna Tuner comes with a 1-year availability for spare parts. For technical support, warranty claims, or further assistance, please contact your retailer or the manufacturer directly. Keep your proof of purchase for warranty validation.