DEVICE: Navtex, Antenna
BRAND: MCMURDO
TYPE: Nav3
NAV3 Tri-Band Active NAVTEX Antenna
Overview
The NAV3 is an advanced, active, tri-band NAVTEX antenna designed for robust and reliable reception across all standard NAVTEX frequencies: 490 kHz, 518 kHz, and 4209.5 kHz. It features a low-profile, end-fed multiband design and does not require a ground plane, making installation straightforward and flexible.
Key Features
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Triple-band coverage: Covers all three main NAVTEX frequencies (0.49, 0.518, 4.2095 MHz) for global navigational telex broadcasts.
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No ground plane needed: Its end-fed design eliminates the need for a ground plane, simplifying mounting.
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Compact and lightweight: Approximately 315 mm in height, weighs around 200 g.
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Durable, marine-grade construction: Built to withstand harsh sea conditions with IP66 protection.
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Moderate power consumption: Operates at 6–12 V DC with average current draw around 10.5 mA.
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50 Ω impedance and vertical polarization: Standard configuration for NAVTEX systems.
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Mounting-ready: Supplied with mounting kit for a G1″-11 threaded pole or bracket.
Specifications at a Glance
| Parameter | Value |
|---|---|
| Frequencies | 0.49 MHz, 0.518 MHz, 4.2095 MHz |
| Bandwidth | 10 kHz (for 0.49 & 0.518 MHz), 150 kHz (for 4.2095 MHz) |
| Impedance | 50 Ω |
| Voltage | 6 – 12 V DC |
| Current | ~10.5 mA |
| Height | ~315 mm |
| Weight | ~200 g |
| Protection Rating | IP66 |
| Operating Temperature | −55 °C to +70 °C |
| Connector | UHF female |
Why It’s a Good Choice
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Ensures complete NAVTEX coverage across all regions (where 490 or 518 kHz is standard)
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Its no-ground-plane requirement makes installation easier on smaller vessels
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Low power draw and compact size are ideal for modern systems
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Built to withstand marine environmental stresses over long service life
