Icom
Icom AT 140 HF Automatic Antenna Tuner
Best automatic tuner for long-range maritime radio communication.
The Icom AT-140 HF Automatic Antenna Tuner is engineered for seamless integration with Icom HF marine transceivers, optimizing performance across the 1.6 to 30 MHz band. Designed for maritime mobile operations, this unit efficiently matches antenna lengths as short as 7 meters (23 feet). Its automatic tuning capability eliminates manual adjustments, quickly finding the minimum SWR using low power during the process. Built for durability in harsh conditions, the tuner features a weather-resistant acrylic case with rubber gaskets, ensuring reliable operation near the antenna base.
$481.40
Owner Satisfaction
4.7
/ 5
Category Rank
2
/ 178
#2 in Marine Radios
Price vs Category Average
-4%
Below average
Frequency Coverage
1.630
/ ~ MHz
Who it's for
- Sailors operating in harsh, saltwater environments
- Icom radio owners seeking a simple, plug-and-play setup
- Operators needing rapid, reliable tuning across all HF bands
Who should skip it
- Installers wanting easy access to their tuning equipment
- Users of non-Icom radio equipment
- Amateur radio enthusiasts running high-power linear amplifiers
Performance breakdown
Tuning Speed
Rapid matching ensures minimal downtime when switching between maritime frequencies.
Marine Durability
Rugged weather-resistant housing thrives in harsh, salt-heavy offshore environments.
Integration Efficiency
Seamlessly pairs with Icom transceivers for a truly plug-and-play experience.
Memory Capacity
Eight storage slots provide quick recall for frequently used antenna configurations.
Power Efficiency
Low-power tuning preserves battery life during critical maritime communication sessions.
Antenna Versatility
Reliably matches wire antennas as short as seven meters for compact setups.
Key Specs
Frequency Coverage
1.6~30 MHz
Max. Input Power
150 W
Rated Voltage
13.6 V DC
Operating Temperature Range
-30C to +60C
Dimensions
230 x 340 x 80 mm
Weight
2.7 kg
Input Impedance
50 ohms
Tuning Power Input
10 W
Features
- Automatic tuning controlled by transceiver switch
- Quick tune-up time of 1.5 to 3 seconds
- Stores 8 tuning information memories
- Uses low 300 mW power for tuning
- Weather-resistant housing for marine use
- Handles up to 150 W maximum input power
- Compatible with 7m or longer wire antennas
What customers say
The Icom AT 140 garners strong positive sentiment, especially in maritime and serious amateur radio circles where reliability is key. Users consistently praise its robust, weatherproof construction, noting its exceptional performance in harsh marine settings. The tuner is celebrated for its speed and efficiency in achieving a low SWR match across the entire HF spectrum, often deemed essential with compatible Icom transceivers. While the unit commands a premium price, its core function is performed flawlessly, offering critical communication capabilities. The consensus confirms the AT 140 is the industry standard for marine HF tuning, justifying its investment through unparalleled dependability and high quality engineering.
Know before you buy
The AT-140 is specifically engineered for seamless integration with Icom HF marine transceivers. While it may be possible to adapt it to other systems, it is designed to be controlled directly by the Icom transceiver's interface for optimal performance.
The AT-140 is designed to match wire antennas as short as 7 meters (23 feet). Using an antenna shorter than this may prevent the unit from achieving a proper SWR match.
The unit features 8 internal memory slots that store tuning information for specific frequencies. This allows the tuner to recall settings almost instantly when you return to a previously used channel.
Yes, the tuner is housed in a weather-resistant acrylic case with rubber gaskets, making it suitable for installation near the antenna base in marine environments. It is built to withstand temperatures ranging from -30°C to +60°C.
No, the AT-140 uses a low 300 mW signal during the tuning process to minimize interference. This ensures that you aren't broadcasting high-power signals while the tuner is searching for the minimum SWR.
The AT-140 is rated to handle a maximum input power of 150 watts. It is important not to exceed this limit to avoid damaging the internal components.
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