Simrad Rf300 Installation Manual [new] Jun 2026

When the rudder is at midships, the transmission link rod must form a perfect 90-degree right angle to both the rudder tiller arm and the RF300 feedback arm.

The unit comes with a fixed cable. Avoid cutting it unless necessary, and ensure proper waterproofing if splices are made. Wiring Scheme (Generic Simrad AP): Red: +5V (Reference voltage) Blue/Black: Ground (0V) White/Shield: Signal (Rudder Signal)

For further technical assistance, consult the official Simrad support documentation or a certified marine electronics technician to ensure the safety and reliability of the vessel's steering system. Share public link

What (hydraulic or mechanical) does your boat use?

If a rudder feedback alarm occurs, check the mechanical alignment (Step 3) to ensure the feedback lever is in the middle position when the rudder is centered. 6. Troubleshooting simrad rf300 installation manual

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What (e.g., AC10, AC20, J300X) are you pairing this with?

The distance from the center of the rudder shaft to the link ball joint must exactly equal the distance from the center of the RF300 shaft to its link ball joint. The standard recommended radius is 140 mm (5.5 inches) .

Do not attempt to remove the transmitter arm from the feedback unit. The unit is factory-calibrated; removing the arm will void the calibration and likely break the internal mechanism. Adjustments are made only via the supplied linkage rod. When the rudder is at midships, the transmission

The RF300 is sealed, but it should be mounted in a location protected from continuous submersion or heavy bilge water.

Are you installing this as part of a or replacing a faulty unit on an existing setup? INSTALLATION REV A Instruction Manual Page 72

Set your multimeter to the Hz scale. Measure across the Brown and White wires at the autopilot computer. It should read approximately 3400 Hz (3.4 kHz) at midships. The frequency should increase or decrease smoothly as the rudder turns.

Drill and tap the rudder tiller arm to attach the ball joint. The goal is to make the Y1 dimension (distance from rudder post center to ball joint) equal to the Y2 dimension (distance from RF300 pivot to attachment point). Wiring Scheme (Generic Simrad AP): Red: +5V (Reference

Turn the helm wheel so the rudder tiller arm is in the exact center position (straight ahead).

It operates at 12V DC and outputs a frequency signal where 3400 Hz represents the center position. Each +/- 20 Hz shift indicates one degree of rudder change. Configuration

The most common cause of autopilot failure is poor mechanical geometry during installation. The RF300 converts linear rudder movement into a rotational signal. To keep this signal linear and accurate, you must follow the .

Connect the ball joints to the rudder tiller arm and the RF300 arm.

Mid-position (0°): 2.7 kHz, 70 Hz per degree of rudder movement

Mount the RF300 on a suitable platform where its center is directly in line with the center of the rudder post.