ATU 100 0A Mini Antenna Tuner 1.8 To 55 MHz 1500mAh OLED

Meet the ATU100 Tuner, a compact automatic shortwave antenna tuner built for portable and home radio setups. With a wide working range of 1.8-55 MHz, it covers most amateur radio HF bands and adapts to many antennas for reliable transmitting and receiving. The tuner houses a set of 7 capacitors and 7 inductors, enabling the largest configuration to achieve effective tuning across the band and help you eliminate SWR mismatches quickly. Constructed from durable aluminum alloy in a sleek black finish, it is wear-resistant and reliable for everyday use.

Key features include a built-in 1500mAh lithium battery (3.7V) and USB Type-C charging, so you can tune on the go without constant power. The 0.91-inch OLED display shows tuning status, SWR, and power readings clearly, making operation straightforward even in field conditions. Automatic tuning means no control wires or manual tweaks are needed—just connect your radio, ATU, and antenna, and press tune.

One-button operation keeps things simple: turn on/off with a single press, making it ideal for quick setup and portable use. The ATU100 supports up to 100W maximum working power and can measure up to 150W, giving you solid performance for most station setups. A typical operating voltage is +12V (DC 10-15V, 13.8V).

Benefits & Tips

• Easy, automatic tuning: no hands-on tuning or control cables needed, saving time and reducing guesswork in real-time DX or field days.
• Portable power for field use: built-in 1500mAh battery and USB-C recharge support mobile setups and emergency operations.
• Practical tuning guidance: for first use, set radio output power to 20-30W; tune in frequency modulation mode and observe SWR/PWR on the ATU display; if SWR is above 2.0 during transmission, adjust or reduce power; when tuning completes and SWR is under 2.0, you can use up to 100W.

Product Specifications

• Name: ATU100 Tuner
• Material: Aluminum alloy
• Color: Black
• Display: 0.91 inch OLED
• Battery: Built-in lithium battery, 3.7V, 1500mAh (included)
• Charge: USB Type-C
• Voltage: Typical +12V (DC 10-15V, 13.8V)
• Working frequency: 1.8-55 MHz
• Maximum current consumption: 400 mA
• Maximum working power: 100W
• Maximum possible measurement power: 150W
• Minimum power to start tuning: 5W
• Minimum possible measurement power: 0.1W
• Measurement step for power up to 10W: 0.1W
• Measurement step with power higher than 10W: 1W
• Power measurement accuracy: 10

Package includes:

• ATU100 Tuner

Warnings & Reminders

• For the first use, set the radio or power amplifier output between 20-30W to protect the tuner during tuning.
• If the SWR display in transmitting state is greater than 2.0, the antenna may be detuned; reduce power or adjust tuning.
• After tuning, ensure SWR is less than 2.0 before transmitting; do not exceed 30W if SWR remains high during initial tests to avoid damage.
• When tuning supports up to 100W, stay within safe operating limits for both the tuner and your radio equipment.

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