The Airmar B75 High 20 Degree CHIRP Transducer delivers broadband sonar capability across two wide frequency ranges, giving anglers the ability to resolve closely spaced fish, detect targets near the bottom, and reach greater depths than conventional single-frequency transducers allow. Unlike a traditional tone-burst fishfinder that transmits at a fixed 50 kHz or 200 kHz, CHIRP sweeps a continuous frequency band — enabling precise range determination through pattern-matching and dramatically improved target separation. The B75 packages the same elements and performance as the B765LH/LM into a low-profile bronze housing sized for boats up to 25 feet, and it connects via an 8-pin connector compatible with Garmin chartplotters and fishfinders.

Specifications:

• Frequency ranges: 25–60 kHz (low band) and 130–210 kHz (high band)
• CHIRP sweep example: 40 kHz to 60 kHz transmission pulse
• Target resolution: precise location within inches using pattern-matching techniques
• Pulse capability: very long pulses for greater range and improved bottom tracking at higher boat speeds
• Cable length: 12 m (40')
• Sensors: depth and fast-response water temperature
• Performance equivalent to B765LH/LM in a low-profile housing
• Transducer housing material: bronze
• Compatible hull types: fiberglass or wood
• Recommended boat size: up to 8 m (25')
• Connector: 8-pin for Garmin