Icom GM800
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Icom · Code GM800
GMDSS · MF/HF
Communications · Safety at sea
Discover the product
The Icom GM800 is an MF/HF GMDSS system with 150 W PEP transmit power and a 24 V DC supply. Its separate main unit and controller allow flexible bridge installation. The manufacturer specifies the AT-141 Version 65 as the required antenna tuner for the system's MED compliance.
Compatible equipment
Documented connections for specific catalogue codes, including parts, requirements and manufacturer sources. Selected equipment ranges are covered; an unlisted combination does not imply incompatibility. Each connection path is assessed separately and is not a complete installation design.
1 documented connection · Sources checked: 2026-10-10
Explore connections, components & diagrams ↗
Equipment connection guide ↗
AT-141 #65 · Tuner antenna · AT-141 #65
GM800 · Direct
AT-141 control
Additionally required:1 × OPC-1465 — OPC-1465
Functions: MF/HF antenna tuning
Applies exclusively to version 65.
The control cable does not replace the RF line, grounding or antenna design. This connection path does not certify a complete GMDSS installation.
Icom GM800 — AT-141 version 65 and control cable · Official manufacturer page · checked 2026-10-10
Functions & interfaces
GMDSS · MF/HF
Technical specifications
Equipment type
GMDSS
Frequency range / Receive
500 kHz ~ 29.9999 MHz (continuously)
Frequency range / Transmit
1.6 ~ 2.9999, 4.0 ~ 4.9999, 6.0 ~ 6.9999, 8.0 ~ 8.9999, 12.0 ~ 13.9999, 16.0 ~ 17.9999, 18.0 ~ 19.9999, 22.0 ~ 22.9999, 25.0 ~ 27.5000 MHz
Frequency range / DSC
2.1875, 4.2075, 6.3120, 8.4145, 12.5770, 16.8045 MHz
Antenna impedance
50 Ω (unbalanced)
Power supply
21.6 ~ 31.2 V (24 V DC)
Consumption current / Receive
Less than 3 A (Maximum audio output)
Consumption current / Transmit
Less than 20 A (Max. output power) (with 1.1 kHz and 1.7 kHz AF input)
Dimensions W × H × D (without projections) / Main unit
367 × 95 × 260 mm
Dimensions W × H × D (without projections) / Controller
274 × 114 × 86 mm
Weight (approximately) / Main unit
8.7 kg
Weight (approximately) / Controller
760 g
Transmit power / At radio terminal
150 W pep (into 50 Ω)
Selection & compatibility
This model is included in our catalogue. The exact configuration, compatibility and supply availability are confirmed when you contact us.
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Kit contents, interfaces and required accessories are checked for the exact part number. Connection to another system does not mean all functions are built in.
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