mAT-125S Automatic Antenna Tuner

Product Overview

The mAT-125S is a compact, general-purpose automatic antenna tuner designed for HF transceivers. It supports a maximum RF power of up to 120 W and operates over a wide frequency range from 1.8 to 54 MHz.

The tuner is compatible with most HF transceivers on the market and is suitable for a wide variety of antennas, including long-wire, dipole, and vertical antennas. With fast tuning performance, the mAT-125S typically completes a full tuning cycle in less than 5 seconds.

Its simple front-panel controls and clear SWR indication make operation straightforward and reliable in both fixed and portable installations. Designed for amateur radio operators who require a dependable and easy-to-use tuning solution, the mAT-125S provides stable performance for everyday HF operation.

The front panel of the mAT-125S is designed for simple and intuitive operation. It features a clear SWR LED indicator that provides a quick visual reference of the antenna match status. A dedicated power indicator shows the tuner's operating state at a glance. The TUNE/BYPASS switch allows the user to select normal operation, initiate a tuning cycle, or bypass the tuner as required. A separate ON/OFF switch provides direct power control without the need to disconnect the power supply.

The rear panel of the mAT-125S provides all necessary connections for reliable station integration. It includes a UHF antenna connector for the antenna feed line and a UHF RF input connector for connection to the transceiver. A ground terminal is provided for connection to the station ground or grounding system to help ensure stable operation. The DC power jack accepts 12–14 V DC input, allowing the tuner to be powered from a regulated power supply or battery source.

Technical Specifications