ICOM AH-4 HF+50MHz Automatic Antenna Tuner

The Icom AH-4 is an automatic antenna tuner designed for use with a 7-meter (23-foot) or longer wire antenna. Here are the key specifications:

Frequency Coverage: It operates from 3.5 MHz to 54 MHz with a long wire antenna of 7 meters (23 feet) or longer. When used with an optional AH-2b, it covers 7 MHz to 54 MHz.
Maximum Input Power: It can handle up to 120 watts PEP.
Input Impedance: The tuner has an input impedance of 50 ohms.
Power Supply Requirement: It requires 13.8 V DC (negative ground) with a current drain of less than 1 amp.
Auto Tuning Accuracy: The AH-4 achieves a VSWR of 2.0:1 or less and tunes in approximately 2 to 3 seconds (maximum 15 seconds).
Number of Memory Channels: It has 45 memory channels.

The AH-4 is a remote, automatic, weather-resistant antenna tuner suitable for HF/50 MHz operation. It also features a PTT function for band-changing. For 3.5 MHz operation, it requires a wire and ground plane. Whether you’re an experienced operator or a newcomer, the AH-4 can enhance your antenna system’s performance.

Please note that the AH-4 is a versatile tuner that can work with various wire antennas, making it a valuable addition to your amateur radio setup. 📻🔗

Specifications

Frequency Coverage	3.5 MHz to 54 MHz (with a long wire antenna, 7 m; 23 ft or longer) 7 MHz to 54 MHz (with an optional AH-2b)
Weight	1.2 kg; 2.65 lb
Dimensions (projections not incuded)	172(W)×71(H)×230(D) mm ; 6.77(W)×2.8(H)×9.06(D) in
Maximum input power	120W PEP
Input impedance	50 Ω
Power supply requirement	13.8 V DC±15% (negative ground)
Current drain	Less than 1 A
Auto tuning accuracy	VSWR 2.0:1 or less
Tuning time	Approximately 2 to 3 seconds (Maximum 15 seconds)
Number of memory ch.	45
Note	for a long wire antenna