Interference with Chirp transducers

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum ObsidianPhish,

Please click here to view a FAQ addressing the subject of Transducer Frequency for CHIRP/DownVision, SideVision, and RealVision 3Dâ„¢ transducers. As indicated within the referenced FAQ, the CHIRP/DownVision (used by Dragonfly, ax8, eSx8, and CP100 products), SideVision, and RealVision 3Dâ„¢ transducers are all designed to chirp across a 60kHz range centered on 200kHz when using CHIRP conical sonar. Replacement of the CHIRP/DownVision with a RealVision 3Dâ„¢ transducer would thus expose the system to the same frequency range which had been previously chirped by the CHIRP/DownVision. As the problem first manifests itself when boat speeds toward plane, the problem is most likely cause by aeration of the transducer. This may be verified by configuring the ping OFF for each of the RealVision 3Dâ„¢ transducer's supported sonar channels and then testing the system. We have a concern the that proximity of the transducer to one another and the larger size of the RealVision 3Dâ„¢ transducer may be contributing to the reported symptoms. Please respond with photos of the vessel's stern showing:
- the proximity of the transducers to one another
- the proximity of the transducers to running gear
- the proximity of trim tabs to the transducers
- the angle of attack for each transducer
- the bottom of the hull forward of the transducers