Malahit ATU-100 EXT Antenna Tuner User Manual

1. Introduction

The Malahit ATU-100 EXT is an automatic antenna tuner designed for amateur radio applications, covering a frequency range of 1.8-50MHz. This device, developed by N7DDC, comes pre-assembled with the latest 3.2 firmware version, offering enhanced performance and bug fixes compared to previous versions. Its compact and robust aluminum alloy housing ensures durability and portability. The ATU-100 EXT is compatible with various radio antennas and is engineered with high-quality components for reliable operation.

This manual provides comprehensive instructions for the setup, operation, and maintenance of your ATU-100 EXT antenna tuner, ensuring optimal performance and longevity.

2. Safety Information

• Power Supply: Ensure the power supply voltage is within the specified range of 10-15 VDC. Using an incorrect voltage may damage the device.
• Power Output: Do not attempt to tune with power lower than 5W, as this may result in insufficient tuning. While the device can handle up to 100 watts after tuning, it is recommended to keep power below 30 watts during the initial tuning process.
• Ventilation: Ensure adequate ventilation around the device to prevent overheating, especially during prolonged operation.
• Environment: Avoid exposing the tuner to moisture, extreme temperatures, or direct sunlight. Operate in a clean, dry environment.
• Modifications: Do not attempt to disassemble or modify the device. Unauthorized modifications will void the warranty and may lead to malfunction or injury.
• Connections: Always ensure all antenna and power connections are secure before powering on the device.

3. Package Contents

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

• 1 x Assembled Malahit ATU-100 EXT Automatic Antenna Tuner machine (No battery included)
• 1 x DC5.5 x 2.1 power cord
• 1 x USB 5V to 9V/12V Booster board

Image: Malahit ATU-100 EXT Antenna Tuner, showing the main unit, DC power cable, and USB booster board.

Image: The ATU-100 EXT and its accessories as packaged in the box.

4. Product Overview

The ATU-100 EXT features a compact design with a durable aluminum alloy casing. It includes an OLED display for real-time information and intuitive controls for tuning and mode selection.

Image: Front view of the ATU-100 EXT, highlighting the display and control buttons.

Image: Rear view of the ATU-100 EXT, showing the antenna, power, and RF input connectors.

Key Components:

• OLED Display: Shows PWR (power), SWR (Standing Wave Ratio), L (inductance), and C (capacitance) values.
• TUNE Button (Green): Initiates the tuning process.
• AUTO Button (Yellow): Toggles automatic tuning mode.
• BYP Button (White): Toggles bypass mode.
• Power Switch (Red): Turns the device on/off.
• ANT Connector: Connects to your antenna.
• RF IN Connector: Connects to your radio's RF output.
• DC12V Input: Power input for the device.

Image: Dimensions of the ATU-100 EXT.

5. Setup

5.1 Powering the ATU-100 EXT

The ATU-100 EXT requires a 10-15 VDC power supply. It does not include an internal battery. The package includes a DC5.5 x 2.1 power cord and a USB 5V to 9V/12V booster board for flexible power options.

Using the USB Booster Board:

If you intend to power the tuner from a 5V USB source (e.g., a power bank), you will need to use the provided USB booster board. This board converts 5V to 12V.

• Connect the USB cable to the booster board's input.
• Solder the 5.5 x 2.1 connector power cable (included) to the output terminals of the booster board. Ensure correct polarity (+ and -).
• Plug the 5.5 x 2.1 connector into the DC12V input on the rear of the ATU-100 EXT.

Image: USB 5V to 12V Booster Board connection diagram.

Voltage Regulation (Booster Board):

To adjust the output voltage of the booster board, locate the potentiometer. Turn it clockwise to increase the voltage and counter-clockwise to decrease it. If the output voltage cannot be adjusted and always equals the input voltage, rotate the potentiometer counter-clockwise more than 10 turns before attempting to adjust it normally.

5.2 Connecting the Antenna and Radio

1. Connect your antenna to the ANT connector on the rear panel of the ATU-100 EXT.
2. Connect your radio's RF output to the RF IN connector on the rear panel of the ATU-100 EXT.
3. Ensure all connections are tight and secure.

6. Operating Instructions

The ATU-100 EXT offers several operating modes for antenna tuning.

6.1 Power On/Off

Press the red POWER switch to turn the device on or off.

6.2 Tuning Modes

Image: Visual representation of Automatic and BYP modes on the display.

Automatic Mode:

• When a dot ('.') appears on the display, the tuner is in automatic mode.
• In this mode, the tuner will automatically adjust inductance and capacitance to achieve the lowest SWR when RF power is applied.
• Press the AUTO button to toggle automatic mode.

BYP (Bypass) Mode:

• When an underscore ('_') appears on the display, the tuner is in bypass mode.
• In bypass mode, the tuner's matching network is bypassed, and the RF signal passes directly through.
• Press the BYP button to toggle bypass mode.

Manual Tuning:

• To initiate a manual tune, press the green TUNE button. The tuner will perform a tuning cycle to find the best match.
• It is recommended to transmit a low power signal (e.g., 5-10W) during tuning. Do not transmit below 5W.
• After tuning, the device can handle up to 100 watts.

6.3 Test Modes

Image: Entering Test Mode.

Test Mode:

• To enter Test Mode, press and hold both the BYP and AUTO buttons simultaneously.
• While holding, turn on the power switch. The display will show "TEST MODE".
• This mode is used for diagnostic purposes.

Image: Entering Fast Test Mode.

Fast Test Mode:

• To enter Fast Test Mode, press and hold the TUNE, BYP, and AUTO buttons simultaneously.
• While holding, turn on the power switch. The display will show "FAST TEST".
• This mode allows for quick testing of the tuner's functions.

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents.
• Storage: When not in use for extended periods, store the tuner in a cool, dry place, away from direct sunlight and extreme temperatures.
• Connections: Periodically check all cable connections for wear or damage. Ensure they are clean and secure.
• Firmware: The device comes with firmware version 3.2. Check the manufacturer's website for any future firmware updates, though user-upgradability may vary.

8. Troubleshooting

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or contact Malahit customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.

For further assistance or inquiries, please visit the official Malahit website or contact your retailer.