ATU-120 PRO 2 BOARD (QRP Version)
100W Automatic L-Network Antenna Tuner/Coupler with Auto-Switching 4:1 UNUN
The ATU-120 PRO 2 BOARD (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 30 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
70W Digital modes (FT8 / RTTY / FM)
Frequency Range
1.5 – 30 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: 200 mA
Designed For
QRP and 100W HF transceivers
Portable and field operation
Digital mode operators
End-fed and multiband wire antennas
Indoor or outdoor installations (feedpoint mounting)
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, 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 can be controlled using two momentary push-ON-buttons (TUNE and MODE) connected via cable , perfect for outdoor setups with the unit installed in a waterproof enclosure at the antenna feedpoint.
For indoor operation, a TFT display controller is also available:
Board size (with UNUN) : 197 x 153 x 45mm
Weight : 0.45kg
Contact us for more information.
Thank you
