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TM258

Product catalog summary

Overview: The TM258 is a 1 kW transom-mount transducer designed for entry-level fishing applications, suitable for inshore and blue-water trolling, as well as deep-water bottom and structure fishing up to 500 meters (1,640 feet). It is versatile for all types of fishing and fits existing TM256 and TM258 models.

Features: The transducer includes a depth and fast-response water-temperature sensor, an elliptical beam for larger bottom area coverage, and a bracket kick-up assembly that locks in the 'up' position to prevent transom damage. It accommodates transom angles between 3° and 21° and is housed in urethane. It is suitable for boats up to 10 meters (32 feet).

Performance: The TM258 features a new high-performance mounting bracket for improved high-speed performance up to 30 knots (35 MPH). It enhances the sensitivity of 600 W sounders, providing 16 times the sensitivity compared to standard transom-mounted transducers. It includes four 50 kHz/200 kHz elements for narrow beam focus, offering crisp targets and clear bottom definition.

Specifications: The transducer weighs 3.6 kg (7.9 lb) and supports a hull deadrise up to 28°. It has a urethane acoustic window and operates at 50/200 kHz with a beamwidth of 15° x 21° and 3° x 5° respectively. The RMS power is 1 kW, with TVR values of 161 dB and 173 dB, and RVR values of -174 dB and -183 dB. The maximum depth range is 441 m to 647 m (1,500’ to 2,200’) at 50 kHz and 206 m to 294 m (700’ to 1,000’) at 200 kHz.

Beam Diameter vs Depth: At 50 kHz, the beam diameter ranges from 2.4 m x 3.3 m (8’ x 11’) at 9 m depth to 74 m x 124 m (245’ x 407’) at 305 m depth. At 200 kHz, it ranges from 0.6 m x 0.9 m (2’ x 3’) at 9 m depth to 16 m x 26 m (52’ x 87’) at 305 m depth.

Transducer Comparison: Compared to the P66 model, the TM258 offers 25 times more sensitivity at 50 kHz and 16 times more at 200 kHz. The TM260 model provides even greater sensitivity.

Dimensions: The TM258 housing measures 137 mm (5.40”) in height, 159 mm (6.25”) in width, and 260 mm (10.23”) in length. The transducer itself measures 190.5 mm (7.50”) in height, 58 mm (2.29”) in width, and 108.2 mm (4.26”) in length.

Catalog excerpts

New Look and Better High-Speed Performance The industry’s first 1 kW transom-mount transducer has a new high-performance mounting bracket. The sleek, new bracket makes the TM258 easier to install. Additionally, its streamlined shape will give you improved high-speed performance up to 30 knots (35 MPH). The TM258 will make 600 W sounders respond like a more powerful model. Get 16 times the sensitivity compared with a standard transom-mounted transducer. The TM258 packs four 50 kHz/200 kHz elements to focus narrow beams at both frequencies, so you’ll see crisp targets and clear bottom definition. 1 kW Entry-Level Fishing Applications • Inshore and blue-water trolling • Deep-water bottom and structure fishing up to 500 m (1,640’) • The versatile 1 kW transducer for all types of fishing Features • Depth and fast-response water-temperature sensor • Elliptical beam covers larger bottom area • Fits existing TM256 and TM258 models • Bracket kick-up assembly locks in the “up” position and will not damage the transom • Accommodates transom angles between 3° and 21° • Urethane housing • Boat Size: Up

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Technical Information SPECIFICATIONS Number of Elements and Configuration Acoustic Window: Urethane DIMENSIONS MAXIMUM DEPTH RANGE 441 m to 647 m BEAM DIAMETER VS DEPTH Depth TRANSDUCER COMPARISON Model Performance Increase Benchmark model for comparison 25 times more sensitive at 50 kHz 16 times more sensitive at 200 kHz 50 times more sensitive at 50 kHz 13 times more sensitive at 200 kHz Due to the wide beams of the P48W and TM270W, they have been omitted from the table. ©Airmar Technology Corporation As Airmar constantly improves its products, all specifications are subject to change without...

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