Furuno R109LH Urethane Chirp Thru-Hull w/Temp & High Speed Fairing Block - No Connector

The Furuno R109LH Urethane CHIRP Thru-Hull Transducer with Temperature and High Speed Fairing Block is a broadband sonar transducer engineered for modern fishing vessels and marine survey applications. This model operates across dual frequency bands—38 to 75 kHz and 130 to 210 kHz—allowing you to dynamically adjust beamwidth and depth penetration based on water conditions and target depth. The urethane housing provides superior durability in saltwater environments, while the integrated high-speed fairing block reduces drag and turbulence at cruising speeds, making it ideal for performance vessels and offshore fishing boats.

The R109LH features built-in temperature sensing, eliminating the need for a separate temperature probe and simplifying transducer installation. By switching between frequencies, anglers and survey operators can optimize beam angle—narrow beams at high frequencies (130–210 kHz) deliver detailed bottom structure and fish targets in moderate depths, while lower frequencies (38–75 kHz) penetrate deeper water columns with wider coverage. This flexibility makes the R109LH effective for everything from shallow coastal fishing to deep offshore applications exceeding 200 feet. The no-connector configuration requires custom integration with your existing sonar system, making it suitable for new installations or system upgrades where connector type must match your transducer cable.

This transducer is purpose-built for serious recreational anglers, commercial fishing operations, and marine research vessels that demand frequency flexibility and salt-water longevity. Weekend fishermen upgrading to broadband CHIRP sonar will appreciate the ability to refine target detection by adjusting frequency mid-session; professional operators benefit from the robust construction and integrated temperature data for precise water column analysis. Thru-hull mounting keeps the transducer flush with the hull, minimizing noise interference from propeller cavitation while maintaining optimal sonar performance at high-speed transit.