HF AUTOMATIC ANTENNA TUNER (P/N at-120) - New Surplus

The at-120 is an HF automatic antenna tuner that matches aircraft HF transceivers to long-wire or airframe antennas. This tuner transforms antenna impedance to 50 ohms, minimizing SWR and optimizing RF power transfer during transmission. Mounted near the antenna feed point, it automatically adjusts matching networks across the HF frequency range without manual tuning.

The tuner connects between the transceiver output and antenna per aircraft AMM specifications. Used in corporate and general aviation aircraft requiring reliable HF communication for long-distance voice and data transmission. Verify compatibility in the aircraft's Illustrated Parts Catalog before installation.

What is the HF AUTOMATIC ANTENNA TUNER (P/N at-120)?

The at-120 is an HF automatic antenna tuner that matches aircraft HF transceivers to long-wire or airframe antennas. This tuner transforms antenna impedance to 50 ohms, minimizing SWR and optimizing RF power transfer during transmission.

Is the at-120 compatible with my aircraft's avionics suite?

Avionics compatibility depends on your aircraft model and existing installation. The HF AUTOMATIC ANTENNA TUNER is available in: New Surplus. We recommend checking your aircraft's wiring diagrams and STC documentation, or contact our avionics team for compatibility assistance.

Does the at-120 come with an 8130-3 airworthiness tag?

Availability of an FAA 8130-3 tag depends on the part condition. Overhauled and repaired units typically include 8130-3 documentation. As-removed units may include a removal tag with trace history. Contact us for specific documentation on the condition you need.

Do you offer bench testing for the at-120?

We can arrange bench testing through our network of FAA-certified repair stations. Call (904) 998-9101 for testing availability and turnaround times, or submit an RFQ with your specific requirements.