Description
Compact Automatic Tuning HF Antenna
High-speed relay-driven automatic antenna tuner for Icom HF base and mobile transceivers.
The Icom AH740 is a compact, relay-driven automatic tuning HF antenna designed for seamless broad-band high-frequency operation from 2.5 MHz to 30 MHz (expandable down to 2.2 MHz with an optional NVIS kit). Built for vehicular, maritime, and fixed-station HF communication setups, the Icom AH740 automatically matches the transceiver output impedance to 50 Ω across HF bands within seconds, ensuring maximum power transfer and signal clarity.
Constructed with a heavy-duty weather-sealed tuner base, a stainless steel whip antenna, and a durable shock-absorbing spring mount, the Icom AH740 is built to withstand high winds, severe vibration, and harsh environmental conditions. Its low-power relay switching mechanism provides rapid tuning speeds and stable impedance matching for emergency response, government, defense, and long-range HF amateur operations.
Key Features & Benefits
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Wideband HF Tuning Range: Covers 2.5–30 MHz with the included whip element and extends down to 2.2–30 MHz when paired with an NVIS kit.
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Rapid Relay-Driven Automatic Tuning: Fast relay switching matches 50 Ω input impedance in seconds for instant frequency changes.
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Rugged Heavy-Duty Spring Mount: Flexible spring connector protects the whip element and tuner base from branch impacts and road vibration.
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Standard SO-239 Antenna Interface: Integrates easily with standard coaxial feedlines and Icom HF transceiver control cables.
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Factory OEM Quality: Genuine Icom engineering ensures full compatibility and automatic control via supported Icom HF transceivers.
Specifications
| Attribute |
Details |
| Brand |
Icom |
| Model/SKU |
AH740 |
| Product Type |
Automatic Tuning HF Antenna |
| Frequency Coverage (Standard) |
2.5–30 MHz (with supplied whip) |
| Frequency Coverage (NVIS Kit) |
2.2–30 MHz (with optional NVIS kit) |
| Input Impedance |
50 Ω |
| Antenna Connector |
SO-239 |
| Weight |
Approx. 3.5 kg (7.7 lbs) |
| Base Dimensions |
238 mm (H) x 145 mm (W) x 160 mm (D) |
| Whip Length |
1540 mm |
| Spring Length |
131 mm |
Compatibility
Icom HF Transceivers
|
|
|
|
| 7100 |
718 |
7300 |
7300MK2 |
| 7610 |
F8101 |
|
|
What's Included
| Description |
SKU/Model |
Status |
| Icom Automatic Tuning Base Unit |
AH740 |
Included |
| 1540mm Whip Antenna Element |
— |
Included |
| 131mm Heavy-Duty Spring Mount |
— |
Included |
Recommended Accessories
HF Transceivers
More Resources
Frequently Asked Questions
What is the primary function of the Icom AH740 antenna?
The Icom AH740 is a compact, relay-driven automatic tuning HF antenna that automatically tunes across 2.5 MHz to 30 MHz frequencies to match your Icom HF radio output.
What is the frequency coverage of the Icom AH740?
The Icom AH740 covers 2.5–30 MHz using the included whip antenna and can operate down to 2.2–30 MHz when used with an optional NVIS antenna kit.
Does the Icom AH740 include a spring mount?
Yes, the Icom AH740 includes a heavy-duty 131mm spring mount to protect the antenna whip and base from physical impact during vehicle transport.
Which antenna connector is used on the Icom AH740?
The Icom AH740 utilizes a standard SO-239 female coaxial connector for 50 Ω input impedance matching.
Which Icom transceivers work with the Icom AH740 tuner antenna?
The Icom AH740 is compatible with Icom HF transceivers including the IC-7100, IC-718, IC-7300, IC-7300MK2, IC-7610, and IC-F8101.
Is the Icom AH740 a genuine Icom product?
Yes, the Icom AH740 is an original equipment manufacturer product manufactured directly by Icom.
Warranty
1-year manufacturer's warranty.
