: 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.
Proper physical alignment is critical to avoid feedback alarms.
The RF300 features a variable frequency output (3400Hz at center, 20Hz per degree) that interfaces directly with the autopilot computer.
This article is the authoritative guide for the Simrad RF300 installation manual, covering its primary function as a high-resolution rudder angle sensor for autopilot systems. While there is no single standalone document exclusively for this component, its complete installation details are embedded within the official system manuals of several autopilots (including the AP16, AP26, AP27, AP35, and AP50), from which this guide is synthesized.
Ensure the feedback arm and the rudder arm are parallel when the rudder is in the dead-ahead position. The transmission link should be at a 90-degree angle to both arms. Connection: simrad rf300 installation manual
The center of the RF300 should be in line with the center of the rudder post.
The unit is mechanically linked to the rudder tiller arm or quadrant. Ensure all moving parts are secured properly to avoid failure at sea.
The Simrad RF300 features a standard two-wire frequency-modulated output signal (unpolarized). It connects directly to the rudder feedback input on compatible Simrad autopilot computers (such as the AC10, AC20, AC40, or Robnet series). RF300 Wire Color Autopilot Computer Terminal Rudder / Feedback Input (Positive/Signal) White Rudder / Feedback Input (Negative/Return) Wiring Best Practices
The effective radius of the RF300 arm should match the effective radius of the attachment point on the tiller arm. : The RF300 is designed to operate within
The Simrad RF300 installation manual is not a standalone booklet but a critical chapter found within the AP-series autopilot manuals. By following this synthesized guide—focusing on the correct mechanical alignment, the non-polarized wiring connection, and proper centering—you ensure your autopilot receives accurate steering data. Treat the RF300 with care (avoid forcing the transmitter arm), and it will provide decades of smooth, accurate steering for your vessel.
: Set the rudder tiller arm to the approximate center position. Rotate the
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The RF300 uses a 3-wire system. Follow the specific wiring diagram in your autopilot computer installation manual. The RF300 features a variable frequency output (3400Hz
Follow the on-screen prompts. The system will ask you to turn the wheel hard-over to port, confirm the angle, and then repeat the process for hard-over starboard.
The RF300 requires almost zero maintenance if installed correctly. However, the mechanical linkage (ball joints and rod ends) will wear over time. Every 12 months, check the linkage for rust or play. Apply a light marine-grade grease to the ball joints to prevent seizing, but ensure no grease gets into the sealed RF300 housing itself.
When the rudder is centered (dead ahead), the RF300 feedback arm must be exactly parallel to the rudder tiller arm. Dimensions and Travel Limits
The mechanical alignment of the RF300 determines the accuracy of your autopilot. You must follow strict geometric rules to avoid damaging the sensor or getting inaccurate readings. The Parallel Rule
: Designed for use in inboard engine autopilot systems and compatible with various Simrad junction units (e.g., J3XX, J50).