Before beginning the installation, it's helpful to review the RF300's key specifications.
The display unit is the control center of the RF300 system, providing users with access to various features and functions.
The Complete Simrad RF300 Installation & Calibration Manual The Simrad RF300 is a high-precision feedback unit. It measures the exact angle of your boat's rudder. This data is critical for autopilot systems like the Simrad AP11, AP20, AP21, and AP22. Without accurate rudder telemetry, an autopilot cannot calculate correct course corrections, leading to steering lag, weaving, or system failure.
The provides a wiring color code table, but confusion often arises because the RF300 can be integrated with older Simrad systems (like the Robertson AP series) and newer NMEA 2000-based systems. simrad rf300 installation manual
The exact (e.g., AC12, J300X) The vessel's steering type (hydraulic or mechanical cable)
The RF300 uses a and Brown wire. The connection is non-polarized , meaning you can connect these two wires to the FRQ+ and FRQ- terminals on your autopilot computer without worrying about which is which. The unit must be properly grounded. Its internal screen should connect to the computer’s ground, and the external terminal requires a short, heavy-gauge (minimum 10mm wide) wire to a dedicated hull ground. Also, consider running the cables through a protective conduit to prevent mechanical damage.
: Connect to the return/ground terminal (often marked as terminal 12). Before beginning the installation, it's helpful to review
: The RF300 is designed to operate within a maximum rudder angle of ±45 degrees . Ensure the arm does not hit its internal physical stops during full port or starboard turns.
Re-check the mounting geometry to ensure that the rudder movement corresponds properly to the movement of the RF300 lever.
: Tighten all mounting screws for the RF300 feedback unit and the ball joint securely. If the transmitter rod is too long, you may need to cut it to length to bring the RF300 closer to the rudder post. It measures the exact angle of your boat's rudder
Verify the unit's operation by turning the helm from hard-over to hard-over to ensure the linkage moves freely and the feedback value changes correctly on the display.
The Simrad RF300 Rudder Feedback Unit is a medium-duty rotary sensor designed for inboard engines to provide precise rudder angle data via a two-wire frequency interface. Installation requires precise alignment on a stable platform close to the rudder, ensuring the transmitter lever is set correctly and the link matches the distance between the rudder post and attachment point. For more details, visit Simrad Yachting . INSTALLATION REV A Instruction Manual Page 72