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The Icom AH-740 is a compact, relay-driven automatic HF tuning antenna manufactured by Icom Inc. in Japan. Purpose-built for commercial, naval, and maritime mobile HF communications, the AH-740 provides wideband frequency coverage from 2.5 MHz to 30 MHz (expandable down to 2.2 MHz with the optional AH-5NV NVIS kit).
Featuring high-speed relay switching, the AH-740 achieves typical memory retuning in approximately 150 milliseconds, allowing rapid channel switching across marine SSB bands. It is housed in an IP55 dust- and water-jet-resistant enclosure built to MIL-STD-810-G environmental standards, ensuring reliable performance when mounted on shipboard decks, cabin roofs, or mast bases exposed to extreme weather, salt spray, and continuous vibration.
Key Features:
• High-Speed Automatic Tuning: Rapid relay tuning matches frequencies in 2 to 3 seconds for new channels and ~150 ms for stored memory channels.
• Compact & Lightweight Build: Weighs only 3.5 kg with a compact base unit, making it ideal for space-restricted marine installations.
• Rugged IP55 & MIL-STD-810-G Design: Built with dust-protection and water-jet resistance to withstand harsh marine environments.
• Low Power Consumption: Consumes a minimal 0.4 A typical current drain, operating on standard 13.8V DC transceiver power.
• Broad Icom Transceiver Integration: Connects seamlessly with Icom HF radios (such as IC-F8101, IC-7300, IC-718, and IC-7610) via control cable.
| Attribute | Specification Details |
| Manufacturer | Icom Inc. |
| Model / Part Number | AH-740 (AH740) |
| Item Type | Compact Relay-Driven HF Automatic Tuning Antenna |
| Frequency Coverage | 2.5 MHz – 29.9999 MHz (standard whip); 2.2 MHz – 29.9999 MHz (with optional AH-5NV NVIS kit) |
| RF Output Power Rating | 125 W PEP (SSB / DATA) |
| VSWR | 1.5:1 typical (50 Ω load after tuning) |
| Tuning Speed | New channel: 2–3 sec typical; Memory tune: ~150 ms typical |
| Memory Channels | 45 channels |
| Tune Input Power | 5 W – 15 W PEP (rated 10 W PEP) |
| Power Supply Requirement | 13.8 V DC ±15% (10.8 V – 15.87 V DC, supplied via transceiver control cable) |
| Power Consumption | 0.4 A typical (tuning) |
| Base Unit Dimensions (W × H × D) | 238 × 145 × 160 mm (9.37 × 5.71 × 6.3 in) |
| Overall Height (Whip + Spring) | 1909 mm (75.16 in) |
| Weight | Approx. 3.5 kg (7.7 lbs) |
| Connector Type | SO-239 (50 Ω input) |
| Protection & Test Standards | IP55 (water-jet and dust protection), MIL-STD-810-G, IEC 60945 |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
| System Compatibility | Icom IC-F8101, IC-7300, IC-718, IC-7100, IC-7200, IC-7610, IC-9100 (requires OPC-2321 adapter cable where applicable) |
| Application | Commercial vessel HF voice/data communications, GMDSS backup SSB antenna tuning, naval mobile HF stations |
| Country of Origin | Japan |
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