| Check | Procedure | Pass Criteria | |-------|------------|----------------| | Mechanical | Shake antenna gently | No movement or rattling | | Continuity | Multimeter between center pin and shield of PL-259 | Open circuit (no short) | | VSWR (optional) | Use an in-line VSWR meter on channel 16 (156.8 MHz) | < 2.0:1 (recommended < 1.5:1) | | Transmission test | Key mic briefly on low power (1 W) | Radio transmits without error |
The RF300 has mechanical stops to prevent the internal potentiometer from being damaged by over-rotation.
Document version: 1.0
© Simrad / Navico Group. For official updates, refer to www.simrad-yachting.com.
The Simrad RF300 is a frequency-based rudder feedback unit designed to provide high-precision rudder angle data to your autopilot computer, such as the , or older AC12/42 units. Mounting the Unit
Proper mechanical installation is critical for accurate steering.
Mount the RF300 near the rudder stock. It must be installed on a flat, stable surface where the transmission link can move freely without hitting the hull or other components. Alignment:
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:
Use the supplied 10m cable to reach your autopilot computer. If you have a custom quadrant, you may need to drill and tap a small hole into the bronze rudder arm for the ball mount. Wiring & Electrical Setup
The RF300 is a two-wire frequency-based sensor (3400Hz center, 20Hz/degree). Terminals: Connect the cable to the dedicated Rudder Feedback terminals on your autopilot computer. simrad rf300 installation manual
Frequency sensors like the RF300 are generally not polarity-sensitive, but always refer to your specific computer’s wiring diagram (e.g., AC12/42 Installation Manual ) to confirm terminal pins. Dockside Calibration
Once wired, you must "teach" the system the rudder's physical limits. Enter Installation Menu: On your control unit (like an ) or MFD, navigate to Settings > Autopilot > Installation Select Source: Ensure the rudder source is set to
. If you have no physical sensor, you would use Virtual Rudder Feedback (VRF), but for the RF300, VRF should be Rudder Calibration:
Follow the on-screen wizard to turn the wheel hard-over to port, then hard-over to starboard. This sets the maximum rudder angles and centers the steering. Quick Maintenance Tips B&G RF300 Rudder Feedback Unit | Autopilot - Simrad
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
The Simrad RF300 Rudder Feedback Unit is a critical component for boat autopilot systems, specifically designed for vessels with inboard engines to provide precise rudder angle data. Installation involves precise mechanical alignment and a simple two-wire electrical connection to an autopilot computer. 1. Mechanical Mounting and Alignment
Correct mechanical placement is vital to prevent rudder feedback alarms.
Location: Mount the RF300 on a suitable platform where its center is directly in line with the center of the rudder post. | Check | Procedure | Pass Criteria |
Orientation: The unit can be mounted horizontally, vertically, or upside-down. Linkage Setup: Do not remove the factory-adjusted transmitter arm.
Drill and tap the rudder tiller arm (typically using a 4.2 mm drill and 5 mm tap) to ensure the linkage dimensions are equal (Y1 = Y2).
Align the transmitter lever with the alignment marks provided; it should be opposite the cable entry when the rudder is centered.
Safety Check: Move the steering from port to starboard to ensure the transmission link does not hit any components or pass "over dead center," which could block the system. 2. Electrical Wiring
The RF300 features a variable frequency output (3400Hz at center, 20Hz per degree) that interfaces directly with the autopilot computer.
Connection: Use the supplied 10-meter (33-foot) cable to connect the unit to the "Rudder Feedback" terminals on compatible computers like the NAC-3, AC70, or H5000.
Routing: Ensure the cable is clamped to allow for full rudder movement and include a "drip loop" to prevent water from following the cable into the unit. 3. Calibration and Testing
After physical installation, the system must be calibrated via the autopilot control head or multifunction display (MFD). Document version: 1
Dockside Setup: Access the Installation Menu and select the RF300 as the source for rudder feedback.
Rudder Calibration: Follow the on-screen instructions to set the center point and maximum travel limits for both port and starboard.
Verification: Regularly inspect the sensor cable for corrosion and verify that the rudder indicator on the display accurately matches the physical rudder position. B&G RF300 Rudder Feedback Unit | Autopilot - Simrad
Here is the text for a Simrad RF300 Installation Manual. This is a generic, technically accurate representation based on standard marine VHF antenna installation practices and Simrad's typical documentation style.
To perform a standard installation, the following tools are required:
Safety Precaution: Always disconnect power to the autopilot system before beginning installation to prevent short circuits or unintended system activation.
This is where most DIY installers deviate from the Simrad RF300 installation manual. The mechanical installation has three sub-steps: bracket attachment, linkage rod installation, and travel adjustment.
The successful installation of the Simrad RF300 is predicated on precise mechanical alignment and correct electrical interfacing. As the primary sensor for vessel heading control, the integrity of the RF300 installation directly correlates to the performance and safety of the autopilot system. By adhering to the procedures outlined in this paper—specifically regarding the parallel mounting geometry and travel limit settings—marine technicians can ensure reliable feedback and extend the operational life of the equipment.