B175L BB TH 12-degree profiled

The Raymarine B175L BB TH profiled 12° transducer (A80045) is a bronze through-hull transducer designed for Raymarine CHIRP fishfinder systems. It is optimized for deep-water detection thanks to its low-frequency CHIRP technology, and its profiled design allows installation without a fairing block on hulls with a deadrise angle of 8 to 15 degrees.

The "L" designation indicates that the transducer operates at low frequency (Low CHIRP). This frequency band is specifically designed for deep-water penetration, providing reliable readings and good target detection at significant depths.

The B175L transducer operates on a low CHIRP frequency range, typically between 40 and 60 kHz. This frequency band is ideal for deep-water detection.

The B175L transducer has a nominal power of 1 kW RMS (Root Mean Square). This high power ensures excellent penetration and detection capabilities, even in challenging conditions or at great depths.

The B175L transducer can reach maximum depths of up to approximately 900 meters (3000 feet), depending on water conditions, salinity, and the power of the connected fishfinder unit.

Although the B175L can operate in shallow water, it is primarily optimized for deep-water detection. For better target separation and more detailed bottom mapping in shallow water, CHIRP transducers with medium (M) or high (H) frequency would generally be more suitable.

The B175L transducer is made of bronze. Bronze is a robust, corrosion-resistant material, particularly well-suited to marine environments. It provides excellent durability and a long service life, which is critical for equipment that remains permanently submerged.

The B175L transducer is typically supplied with a standard 10-metre (approximately 33-foot) cable. This length is often sufficient for most onboard installations.

The B175L (Low CHIRP) operates at low frequency (40–60 kHz) and excels in deep-water penetration. In contrast, the B175M (Medium CHIRP, 80–130 kHz) and B175H (High CHIRP, 130–210 kHz) models provide better target separation and finer resolution at shallower depths, making them more suitable for coastal fishing or identifying structures near the surface.

Yes, the B175L transducer is a CHIRP transducer (Compressed High-Intensity Radiated Pulse). It emits a frequency sweep across a wide band rather than a single fixed frequency, which significantly improves resolution, target separation, and seabed image clarity compared to traditional transducers.

CHIRP low-frequency technology, as used in the B175L, offers several advantages for deep-sea fishing:

Increased penetration: It reaches very deep depths.Improved detection: It helps identify fish schools and bottom structures even at hundreds of meters.Less noise: It is less sensitive to interference and noise in deep water.

To maintain the performance of your B175L transducer, it is recommended to clean it regularly to remove marine dirt, algae, and encrusting organisms. Use a soft brush and fresh water. You can also apply a specific antifouling paint for transducers (without solvents or ketones) to prevent marine growth, ensuring not to paint the active surface of the ceramic element.

The "angled 12°" marking indicates that the internal element of the transducer is tilted by 12 degrees. This design allows the transducer to be installed flush on a boat hull with a deadrise angle (V-hull) between 8 and 15 degrees, without requiring an additional fairing block. The beam is thus corrected to be oriented vertically toward the bottom.

No, the B175L BB TH transducer is a 12-degree fairing model. Its design already incorporates the angle needed to compensate for hull deadrise (between 8 and 15 degrees), eliminating the need for an external fairing block.

The B175L transducer, being made of bronze, is ideal for installation on fiberglass or wood hulls. It is not recommended for metal hulls (aluminum or steel) due to the risk of galvanic corrosion between the bronze and the hull metal.

The B175L transducer with a 12-degree profile is designed to be installed on hulls with a deadrise angle between 8 and 15 degrees. This range ensures the transducer's internal element is correctly oriented for optimal vertical beam performance.

The B175L transducer is compatible with Raymarine fishfinder and chartplotter systems that support CHIRP technology. This typically includes multifunction displays from the Axiom and Element series, as well as other units compatible with Raymarine CHIRP sounder modules such as the CP450C or CP570.