The Airmar 509LHW thru-hull transducer covers four of the most widely used fishing frequencies — 28, 38, 50, and 200 kHz — in a single unit, delivering up to 3 kW of power. Narrow low-frequency beams reach depths to 10,000 feet, while the wide high-frequency beam handles shallower conditions. Compatible with hull deadrises from 0 to 25 degrees, it works across a broad range of vessel types and comes with installation instructions included.

Specifications:

• Operating Frequency: 28–60 kHz and 150–250 kHz
• Power Output: 2–3 kW
• Maximum Depth: 10,000 feet
• Beamwidth: 5×9 to 11×23 degrees (low frequency) or constant 25 degrees (high frequency)
• Deadrise Range: 0–25 degrees
• Optimized for fishing frequencies: 28, 38, 50, and 200 kHz
• Narrow low-frequency beam for deep-water penetration
• Wide high-frequency beam for shallow-water performance
• Installation instructions included

Resources:

• Owner's Manual (PDF)
• Product Brochure (PDF)

⚠️ California Prop 65 Warning: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.