Furuno 165T/265LH-PM488 DFF3D CHIRP Combo Pocket Mount Transducer

The Furuno 165T/265LH-PM488 DFF3D CHIRP Combo Pocket Mount Transducer is a dual-frequency sonar transducer engineered for serious marine applications requiring precise bottom detection and fish-finding capability. This pocket mount combination transducer integrates both DFF3D elements operating at 165 kHz and CHIRP technology in a compact, field-proven housing that mounts directly to vessel hulls or boat wells without extensive modifications.

The dual-frequency architecture delivers operational flexibility across multiple fishing depths and conditions. The low-frequency CHIRP range (42–65 kHz) with beamwidth variance from 25° to 16° provides extended range penetration and broader target acquisition for deep water work, while the high-frequency CHIRP band (130–210 kHz) narrows the beam for precision returns on structure and baitfish in moderate depths. The 165 kHz DFF3D element adds dedicated frequency coverage for mid-water column scanning. Housing dimensions of 12L × 5W × 3.5H inches enable discreet installation on vessels where space and aesthetics matter, while the pocket mount design simplifies retrofitting to existing transducer wells.

This transducer suits commercial and recreational operators who depend on reliable sonar data in variable bottom conditions—coastal fishing grounds with mixed substrate, offshore structure work, and freshwater reservoir mapping all benefit from the frequency switching and beam control this combo unit provides. Furuno's engineering focus on transducer reliability makes this unit suitable for salt-air environments and sustained high-use operational tempo where corrosion resistance and signal stability cannot be compromised.

CHIRP technology broadens the frequency sweep within each operating band, improving target separation and bottom definition compared to fixed-frequency transducers. The variable beamwidth across the frequency range allows operators to balance coverage area against target resolution—wider beams for area surveys, narrower beams for precise structural identification and fish location pinpointing.