Radioddity ATU-100 Automatic Antenna Tuner | 1.8–55MHz | 0.96" OLED Display | 5000mAh Battery | Micro-USB Charging | HF Auto Tuner | For QRP Ham Radio Transceivers

The Radioddity ATU-100 Automatic Antenna Tuner is a compact and reliable tool for ham radio operators. It supports 1.8–55 MHz and up to 100W of power, automatically adjusting your antenna’s impedance for better performance and lower SWR—no manual tuning needed. Built for portability, it includes a 5000mAh rechargeable battery and Micro-USB charging, letting you tune anytime, anywhere. The 0.96" OLED screen clearly shows tuning status, and the aluminum alloy case ensures durability in the field. Perfect for base stations, portable setups, and emergency communications, the ATU-100 makes antenna tuning fast, easy, and precise. How to Use: 1. Connect your equipment - Use a 50Ω coax cable to link your radio to the ATU-100, and connect the tuner's ANT port to the antenna. 2. Set initial power level - For first-time tuning, set output power between 20-30W (ensure FM, AM, CW, or SSB mode). High power tuning risks damage. 2. Select radio mode - Use FM (or other continuous-wave modes like CW/SSB) with 20-30W power, then key your radio (press PTT) and monitor the ATU-100 display for PWR and SWR readings. 4. Tune using the button - Short press (＜1s): reset the previous tuning. Long press (>1s): initiate the tuning cycle. 5. Observe tuning progress - OLED will show updated PWR, SWR, L (inductance), and C (capacitance). Notes: Minimum tuning power: Ensure at least 5W output—below this may lead to insufficient tuning. Maximum continuous power: Supports up to 100W working power, with bursts up to 150W for brief measurements. Avoid tuning at maximum power to prevent risk. Specifications: Item Type: Antenna Tuner Model: ATU-100 Operating Frequency: 1.8-55 MHz Battery Capacity: 5000mAh Material: Aluminum Alloy Display: 0.96" OLED Size: 3.5" x 2.0" x 1.5" / 8.8 x 5.3 x3.8cm Weight: 1.1lb / 0.48kg USB Charging Current: 1A Typical Power Consumption: 150-200mA Maximum Operating Power: 100W Maximum Measurable Power: 150W Minimum Power Required for Tuning: 5W Minimum Measurable Power: 0.1W Measurement Increment (≤10W): 0.1W Measurement Increment (>10W): 1W Power Measurement Accuracy: ±10% Minimum Installed Inductance: 8.53 μH Inductance Step Resolution: 0.05 μH Maximum Installed Capacitance: 1869 pF Capacitance Step Resolution: 10 pF What's in the box? 1 x Antenna Tuner 1 x USB Cable 1 x User Manual