The Icom AT-141 is a heavy-duty automatic antenna tuner manufactured by Icom Inc. in Japan. Designed as the primary antenna coupler for Icom’s commercial marine HF SSB transceiver series—including the IC-M803, IC-M804, IC-M802, and IC-M700PRO—the AT-141 automatically matches the transceiver to long-wire or whip antennas across the 1.6 MHz to 30 MHz high-frequency spectrum.

Housed in a rugged, weatherproof acrylic enclosure, the AT-141 is built for outdoor installation near the base of the antenna on open decks, masts, or superstructures. Controlled directly by the connected transceiver via a single 4-pin control cable, the unit performs rapid low-power impedance matching in under three seconds and stores tuning settings in internal memory for instantaneous recall when switching frequencies.

Key Features:
• Rapid Automatic Tuning: Automatically tunes long-wire and whip antennas to a low VSWR (1.5:1 or better) in 2 to 3 seconds.
• High-Capacity Frequency Memory: Remembers previously tuned settings to achieve instant matching (<0.2 seconds) upon returning to familiar channels.
• Weatherproof IPX6 Enclosure: Durable, moisture-sealed housing designed for external mounting under harsh marine weather and salt-spray exposure.
• Low-Power Tune Function: Uses minimal RF power during the tuning cycle to avoid causing radio frequency interference (RFI) to other marine equipment.
• Full Transceiver Integration: Powered and controlled directly through the standard 4-pin control cable from compatible Icom HF SSB transceivers.