Futaba R2104GF 2.4GHz S-FHSS 4-Channel Receiver Instruction Manual

1. Introduction

This manual provides essential instructions for the proper installation, operation, and maintenance of the Futaba R2104GF 2.4GHz S-FHSS 4-Channel Receiver. This receiver is designed for use with the Futaba 4-PL S-FHSS four-channel surface radio system.

Please read this manual thoroughly before using the receiver to ensure safe and efficient operation.

2. Features

• Compatibility: Specifically designed for use with the Futaba 4-PL S-FHSS four-channel surface radio.
• 2.4GHz S-FHSS System: Utilizes Futaba's advanced Spread Spectrum technology for reliable communication.
• 4-Channel Operation: Provides four independent channels for controlling various functions.
• High Voltage Compatibility: Designed to operate with high voltage systems.
• Normal and High-Speed Modes: Supports both normal and high-speed operation modes. Normal mode frame rate is 13.63ms (FHSS/S-FHSS).

3. Package Contents

The Futaba R2104GF receiver package includes:

• One (1) Futaba R2104GF 2.4GHz S-FHSS 4-Channel Receiver
• One (1) Instruction Sheet

4. Receiver Overview

Figure 1: Futaba R2104GF 2.4GHz S-FHSS 4-Channel Receiver. This image displays the top view of the receiver, showing the Futaba branding, model number R2104GF, 2.4GHz S-FHSS system label, and the four channel ports (1-4), a battery port (B), a switch (SW), and an LED indicator. An antenna wire extends from the left side.

The receiver features clearly labeled ports for channels 1 through 4, a dedicated battery port (B), a binding switch (SW), and an LED indicator for status. The antenna is integrated for optimal signal reception.

5. Setup and Installation

5.1. Installation in Model

1. Mounting: Securely mount the R2104GF receiver in your model using vibration-absorbing material (e.g., foam tape) to protect it from shocks and vibrations. Ensure it is placed away from electric motors, ESCs, and other noise-generating components.
2. Antenna Placement: Position the antenna in a location that provides maximum signal reception and is free from obstruction by metal parts. The antenna should be extended as straight as possible.

5.2. Connecting Components

1. Servos: Connect your servos to the corresponding channel ports (1-4) on the receiver. Ensure correct polarity (signal, positive, negative).
2. Battery/ESC: Connect the battery or Electronic Speed Controller (ESC) to the 'B' (Battery) port. If using an ESC with a built-in BEC (Battery Eliminator Circuit), connect the ESC to channel 2 (throttle) and the BEC will power the receiver. If using a separate receiver battery, connect it to the 'B' port.

5.3. Linking to Transmitter (Binding)

The R2104GF receiver must be linked (bound) to your Futaba 4-PL S-FHSS transmitter before use. Follow these steps:

1. Turn on your Futaba 4-PL S-FHSS transmitter and ensure it is in S-FHSS mode.
2. Connect the battery to the receiver. The LED on the receiver will begin to flash.
3. Press and hold the 'SW' (Switch) button on the receiver for approximately one second. The LED will change from flashing to solid green, indicating successful linking.
4. Release the 'SW' button.
5. Turn off the receiver, then turn off the transmitter.
6. Turn on the transmitter first, then the receiver. The LED on the receiver should immediately illuminate solid green, confirming the link.
7. Test all control surfaces and functions to ensure proper operation before actual use.

Note: If the LED does not turn solid green, repeat the linking process. Ensure the transmitter and receiver are within close proximity during the linking procedure.

6. Operating Modes

The R2104GF receiver supports two operating modes:

• Normal Mode: This is the standard operating mode. The frame rate for FHSS/S-FHSS is 13.63ms. This mode is suitable for most applications and standard servos.
• High-Speed Mode: This mode offers a faster response time. It is typically used with digital servos that can handle higher frame rates. Refer to your transmitter's manual for instructions on how to select High-Speed mode. Ensure all connected servos are compatible with high-speed operation before activating this mode.

7. Maintenance

• Cleaning: Keep the receiver clean and free from dust, dirt, and moisture. Use a soft, dry cloth for cleaning. Avoid using solvents or harsh chemicals.
• Inspection: Regularly inspect all connections (servo, battery) for secure fit and signs of wear or damage. Check the antenna for any kinks or cuts.
• Storage: Store the receiver in a dry, cool environment away from direct sunlight and extreme temperatures when not in use.

8. Troubleshooting

If you encounter issues with your R2104GF receiver, consider the following:

• No Power/LED Off:
  • Check battery connection and ensure the battery is charged.
  • Verify correct polarity of battery connection.
• No Link/LED Flashing:
  • Ensure the transmitter is powered on and in S-FHSS mode.
  • Repeat the linking procedure (Section 5.3).
  • Confirm the transmitter and receiver are within close range during linking.
  • Check for interference from other 2.4GHz devices.
• Intermittent Control/Loss of Signal:
  • Check antenna placement; ensure it is not obstructed or damaged.
  • Verify that the receiver is securely mounted and free from excessive vibration.
  • Ensure the transmitter battery is adequately charged.
  • Avoid operating in areas with high 2.4GHz interference.
• Servos Not Responding:
  • Check servo connections for correct port and polarity.
  • Ensure servos are not mechanically bound or damaged.
  • Verify that the transmitter is sending correct commands.

If problems persist, consult the Futaba 4-PL S-FHSS transmitter manual or contact Futaba customer support.

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your Futaba 4-PL S-FHSS radio system or visit the official Futaba website. Keep your purchase receipt as proof of purchase for warranty claims.

Manufacturer: Hobbico Inc