Airmar TM275C-LHW 1kW Chirp Transom Mount Transducer

The Airmar TM275C-LHW 1kW Chirp Transom Mount Transducer is a high-frequency sonar transducer engineered to deliver exceptional bottom detail and fish-finding capability on vessels equipped with Chirp-ready fish finders. Operating across the 150–250 kHz band, this transom-mounted unit combines wide beam coverage with superior resolution, making it a proven choice for anglers seeking greater structural detail and more reliable target detection across varying water conditions and depths.

The TM275C-LHW features a fixed 25-degree beam angle across all frequencies within its operating range. This wide, constant beamwidth provides approximately twice the lateral coverage under the boat compared to conventional high-frequency transducers, a critical advantage when mapping bottom structure or tracking suspended fish. The 1 kW power output delivers sufficient signal strength for reliable performance in freshwater lakes, coastal bays, and offshore applications. Transom mounting offers straightforward installation and accessibility, though proper through-hull placement and hull preparation are essential for eliminating air pockets and ensuring optimal acoustic coupling to the water.

This transducer is ideal for recreational and serious anglers who prioritize high-definition sonar imaging over maximum depth penetration. The high-frequency band excels in waters shallower than 250 feet, where fine detail matters—identifying submerged timber, ledges, weed edges, and individual fish targets. Boaters running modern Garmin, Lowrance, Humminbird, or other Chirp-compatible plotters will benefit from the transducer's ability to deliver the frequency diversity that Chirp sonar is designed to exploit, enabling advanced target separation and noise rejection.

Compatibility with your specific fish-finder model and transducer connector type must be verified before purchase. The TM275C-LHW uses the Airmar UniMap connector system on the version sold through TacticalSurplusUSA, requiring confirmation of plug compatibility with your sonar unit's head.