ETD 100/350 electric whistle, suitable for vessels with a LOA 20m till 75m.

 

A Strong Signal Without Noise

Many who navigate under the IMO Regulations (COLREG 1972) understand the importance of sound pressure levels for efficient signaling. However, the rules also state that “the sound pressure level of the vessel’s own signal at the listening posts shall not exceed 110 dBA and, as far as practicable, should not exceed 100 dBA.” This creates a challenge: how can a vessel emit a strong signal without producing excessive noise onboard?
 

Solving the Paradox

The common solution to this dilemma is placing the whistle high above deck. But what if even the highest point isn’t high enough? The answer lies in a whistle with unsymmetrical sound distribution. This innovative design offers several benefits:

• Focused Sound Radiation: The total sound is directed towards the horizontal plane, reducing downward (and upward) noise by up to 10 dBA.
• Even Sound Distribution: The sound spreads appropriately in all horizontal directions, ensuring compliance with the headline sound pressure levels prescribed by IMO.
• Optimized Sound Spectrum: This specially designed sound spectrum ensures high electro-acoustic efficiency and rich “tone color,” making the signal more perceptible in noisy environments.
• Durable Design: The horn uses twin-unit electrodynamic drivers protected by non-metallic, glass-fiber reinforced polyester, ensuring durability and long-term performance.

These advancements come together in the TYFON ETD 100/350, a new horn with a vertically extended front that tackles the issue of excessive onboard noise.
 
Additionally, when a “combined system” of two whistles, as described by the IMO, is employed, an even more effective and significant tone spectrum is produced. An air-driven TYFON for 260 or 440 Hz adds further reliability and top-notch performance.

 

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