ATU-120 PRO 2 (QRP Version)
120W Automatic L-Network Antenna Tuner with Auto-Switching 4:1 UNUN
The ATU-120 PRO 2 (QRP Version) is a compact and efficient automatic antenna tuner designed for QRP and medium-power HF operation. Engineered with a precise L-network topology, it provides reliable impedance matching from 1.5 to 54 MHz, ensuring optimal performance across the entire HF spectrum.
This upgraded version includes a built-in automatic 4:1 UNUN, enabling seamless matching of high-impedance antennas such as end-fed wires and long-wire antennas—without the need for manual switching.
Key Features
Maximum Power Handling
120W PEP
50W Digital modes (FT8 / RTTY / FM)
Frequency Range
1.5 – 54 MHz (Full HF coverage)
Input Impedance
50 Ohm
Tuning Network
High-efficiency L-Network design for low loss and stable operation
Automatic 4:1 UNUN (NEW)
Built-in and automatically switchable
Extends matching range for high-impedance antennas
Ideal for end-fed, long-wire, and non-resonant antennas
Smart Memory System
25 Memory Channels
Instantly recalls previous tuning settings for fast band changes
Operating Modes
AUTO Mode: Fully automatic tuning (start tuning when antenna swr is >1.8)
MANUAL Mode: Tune start by user command.
Precision Tuning Performance
Maximum Installed Inductance: 25.6 µH
Minimum Inductance Step: 0.1 µH
Maximum Installed Capacitance: 1905 pF
Minimum Capacitance Step: 15 pF
Fine tuning resolution ensures low SWR, maximum efficiency, and minimal power loss.
Electrical Specifications
Required Tuning Power: 2 – 10 Watts
Power Supply: 12 – 14 V DC
Maximum Current Consumption: 400 mA
Designed For
QRP and 100W HF transceivers
Portable and field operation
Digital mode operators
End-fed and multiband wire antennas
Why Choose the ATU-120 PRO 2 ?
✔ Compact and efficient QRP design
✔ Wide matching capability
✔ Fast and accurate automatic tuning
✔ Memory recall for instant operation
✔ Auto-switching 4:1 UNUN for extended impedance coverage
✔ Designed for feedpoint installation also, the ATU operates as an automatic antenna coupler for end-fed and long-wire antennas, improving matching efficiency and reducing feedline losses.
The ATU-120 PRO 2 BOARD delivers high performance, flexibility, and reliability in a compact form factor—making it the ideal solution for both portable and fixed QRP stations.
The ATU controlled using two momentary buttons (TUNE and MODE).
Board size (with UNUN) : 255 x 205 x 75mm
Weight : 2.28kg
Contact us for more information.
Thank you
