[CA] [CA11] Help with odd sonar readings

[Chuck - Raymarine - Moderator]

Q. So when you say some noise from the rv transducer would be expected, what exactly does that mean? Crosstalk?
A. Yes. As indicated within the FAQ found here, the CPT-S and CHIRP Conical sonar transducer elements of transducers designed use with Dragonfly displays, ax8 MFDs, eSx8 MFDs, CP100 and AXIOM MFDs chirp across a 60kHz range centered on 200kHz. Accordingly, should the B60 be pinging at 200kHz, then crosstalk may occur, but most consider it to be very low level noise. Such crosstalk would not be encountered with RealVision, SideVision, or DownVision sonar channels, as they are centered on 350kHz.

Most systems featuring more than one Axiom MFD, only one of the MFDs will only feature RV sonar processing circuitry and in such system's a Y-Cable would be employed to interface both transducers. Notable is the fact that when a Y-Cable supporting RV and 50kHz/200kHz transducer use is employed, the CHIRP Conical sonar transducer element will be disabled.