Pack de deux sondes traversantes B175 D/T Low-Medium 20 deg

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Raymarine

T70076

Pack of two Raymarine B175 D/T Low-Medium 20° through-hull transducers

Designed for 1 kW CHIRP underwater detection, this Raymarine T70076 pack includes two B175 D/T Low-Medium 20 deg through-hull transducers. Each bronze transducer offers 40-60 kHz and 80-130 kHz frequencies with a 20-degree hull-angle compensation, providing accurate depth and temperature data. This pack is ideal for dual-sounder systems or large vessels. It includes two B175 D/T Low-Medium 20 deg transducers with mounting kits.

Retail priceBenefit from the professional rate

£2,647.54 GBP

£2,647.54 GBP ~~£2,811.06 GBP~~

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

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Technical specifications

Supported sonar technologies	CHIRP
Fishfinder frequencies	40-60, 80-130
Operating temperature	-10°F to 122°F
Peak power	1000.0
Max depth reading	762.0
Transducer material	Bronze
Sonar connector type	11-pin
Cable length	10.0
Product width	95 mm
Integrated temperature sensor	Yes
Product height	130 mm
Compatible displays	Raymarine CP470, CP570 fishfinder modules; Raymarine Axiom, Element Pro multifunction displays
IP rating	IPX7
Compass safe distance	0
Mounting type	Through-hull
Certifications	CE
Temperature measurement range	-10°C to 40°C
Beam coverage angle	11 to 24
CHIRP high frequency	80-130
CHIRP low frequency	40-60
Fishing type	Sea, Tow, Vertical
Integrated speed sensor	No
User level	Expert
Warranty	2.0

Detailed description

The pack of two Raymarine B175 D/T Low-Medium 20° through-hull transducers (reference T70076) is designed for recreational boaters and professionals requiring 1 kW CHIRP depth sounder performance. Each transducer, featuring a robust bronze housing, integrates CHIRP technology across the low (40-60 kHz) and medium (80-130 kHz) frequency bands, offering versatility for deep-water and coastal detection. The B175LM transducer provides depth and temperature data essential for navigation and fishing.

CHIRP Performance and Adaptability

With 1 kW power, the B175LM delivers superior target resolution and improved echo separation compared to conventional 600 W transducers such as the B75 series. The low band (40-60 kHz) is optimized for deep-water penetration, with a variable beam angle ranging from 24° to 16°. The medium band (80-130 kHz) ensures detailed fish and structure detection in intermediate depths, with a beam angle of 16° to 11°. Each transducer in the pack features a 20° tilted ceramic element, correcting hull angle for vessels with a deadrise between 16° and 24°, ensuring a precise vertical beam for optimal readings.

Integration and Positioning

This transducer pack integrates with Raymarine CHIRP depth sounder systems, including CP470 and CP570 modules, and multifunction displays from the Axiom and Element Pro ranges. Unlike a B75 transducer, which offers 600 W, the 1 kW B175LM is intended for applications requiring higher power and depth capability. The inclusion of two identical transducers in this pack (T70076) allows for advanced configurations, such as use with two separate sounder modules for extended coverage or redundancy, or for large vessels requiring multiple measurement points for comprehensive seabed mapping. Compared to transducers like the Airmar TM150M (600 W, transom-mount, medium frequency only) or the B260 (1 kW, fixed dual-frequency, non-CHIRP), the B175LM offers modern CHIRP technology with a discreet and high-performance through-hull installation.

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis: Raymarine B175 D/T CHIRP 1kW through-hull transducers »

The Raymarine B175 D/T Low-Medium 20° dual through-hull transducer pack is an advanced solution for CHIRP 1kW underwater data acquisition. Integrating two identical transducers in a single pack is particularly relevant for demanding setups. On large vessels or multihulls, this allows optimized transducer positioning for seamless coverage, avoiding potential interference from the keel or other appendages. It is also ideal for installations requiring critical redundancy or powering two independent fishfinder modules, providing increased flexibility for complex navigation and professional fishing systems.

The bronze through-hull installation, while more complex than a transom-mount setup, delivers superior hydrodynamic performance and better protection against turbulence. The 20° hull-deadrise compensation is a key selection factor: it is imperative that the vessel’s deadrise angle matches this specification (between 16° and 24°) to ensure a perfectly vertical beam and accurate readings. Incorrect installation of this parameter would negate some of the benefits of CHIRP technology. For vessels with a deadrise angle that does not match, other B175 models (0°, 12°, or versions with fairing blocks) would be more appropriate.

Technically, the B175LM positions itself as a versatile 1 kW option. The combination of low and medium bands provides a good balance between deep-water penetration and fine-target detection in intermediate depths. This differentiates it from single-frequency transducers or CHIRP models labeled "High-Wide" that excel in shallow waters but lack range. This pack is therefore a strategic choice for captains seeking a robust, high-performance solution adaptable to specific installation requirements.

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Pack of two Raymarine B175 D/T Low-Medium 20° through-hull transducers

£2,647.54 GBP

£2,647.54 GBP ~~£2,811.06 GBP~~

Frequently Asked Questions

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What exactly is included in the Raymarine B175 D/T Low-Medium 20° dual-sonde pack?

The pack (reference T70076) includes two identical Raymarine B175 D/T Low-Medium through-hull transducers with a 20-degree tilted element. Each transducer is a 1 kW CHIRP depth sounder capable of providing depth and temperature data.

What material is the housing of these transducers made of?

The housing of each transducer is made of robust bronze, ensuring durability and resistance in the marine environment.

What is the purpose of the 20-degree tilt of the ceramic element in the depth sounder?

The 20-degree tilted ceramic element is designed to compensate for the hull angle of vessels. It ensures the fishfinder's beam is directed vertically toward the seabed, even if the boat's deadrise angle is between 16 and 24 degrees, thus guaranteeing accurate and optimal readings.

For which type of hull are these through-hull transducers suitable?

These through-hull transducers are designed to be installed through the vessel's hull. They are particularly suited to hulls with a deadrise angle (keel angle) between 16 and 24 degrees, thanks to their 20-degree tilted element that compensates for this angle.

Which Raymarine systems are these B175LM transducers compatible with?

These transducers are compatible with Raymarine CHIRP sonar systems. They integrate with CP470 and CP570 sounder modules, as well as with multifunction displays from the Axiom and Element Pro ranges.

What is the performance difference between the B175LM transducer and a B75 series transducer?

The B175LM transducer delivers 1 kW of power, providing superior target resolution and better echo separation compared to conventional 600 W transducers, such as those in the B75 series. It is designed for applications requiring higher power and deeper penetration capability.

What are the optimal water depths for low and medium frequency bands?

The low-frequency band (40-60 kHz) is optimized for deep-water penetration. The medium-frequency band (80-130 kHz) is ideal for detailed fish and structure detection in intermediate depths.