Futaba 4GRS 2.4GHz TFHSS Telemetry Radio System Instruction Manual

Introduction

This manual provides comprehensive instructions for the setup, operation, and maintenance of your Futaba 4GRS 2.4GHz TFHSS Telemetry Radio System. Please read this manual thoroughly before using the product to ensure safe and optimal performance.

The Futaba 4GRS is a high-performance 2-stick radio system designed for various RC applications, including crawlers, scale racers, and competition boaters. It features advanced functions like telemetry, dual ESC mixing, 4WS mixing, and programmable mixing.

Product Overview

Figure 1: The Futaba 4GRS 2.4GHz TFHSS Transmitter, accompanied by the R304SB 4-Channel Telemetry Receiver and a switch harness. This image displays the complete system components.

Key Features:

• 2-Stick T-FHSS Surface System: Reliable 2.4GHz communication for surface models.
• R304SB 4-Channel Telemetry Receiver: Included receiver with telemetry capabilities.
• Servo Reverse: Adjust servo direction.
• End Point Adjustment (EPA): Set the maximum travel for each servo.
• Fail-Safe Function: Pre-set servo positions in case of signal loss.
• Exponential Adjustment: Fine-tune servo response around the center.
• Servo Speed: Adjust the speed of servo movement.
• A.B.S. Function (Anti-skid Braking System): Improves braking performance.
• Steering Dual Rate: Adjust steering sensitivity.
• Select Switch/Dial Function: Assign functions to switches and dials.
• Brake Mixing: Mix brake functions for advanced control.
• Programmable Mixing: Create custom mixes between channels.
• 4WS Mixing: Control four-wheel steering systems.
• Dual ESC Mixing: Ideal for locking differentials or independent motor control.
• Gyro Mixing: Integrate gyroscope stabilization.
• CPS Mixing: Specific mixing for certain applications.
• Data Transfer: Transfer model data.
• Timer Feature: Built-in timer for lap times or run times.
• 40 Model Memory: Store settings for up to 40 different models.
• Jog Dial Button Layout: Intuitive menu navigation.
• External Telemetry Display: Supports external voltage, temperature, and RPM display (sensors sold separately).

Setup

1. Transmitter Battery Installation

1. Open the battery compartment cover on the back of the transmitter.
2. Insert four AA dry cell batteries, ensuring correct polarity (+/-).
3. Close the battery compartment cover securely.

Figure 2: Front view of the Futaba 4GRS Transmitter, showing the display, sticks, and various controls. This view highlights the user interface for operation.

2. Receiver (R304SB) Connection

1. Connect the R304SB receiver to your model's electronic speed controller (ESC) or power source. The receiver requires a power supply of 3.7V-7.4V.
2. Connect your servos to the appropriate channels on the receiver.
3. Ensure all connections are secure and correctly polarized.

3. Binding the Receiver to the Transmitter

Refer to the detailed binding procedure in the separate "Futaba T-FHSS System Manual" for specific steps to link your R304SB receiver with the 4GRS transmitter. This process establishes a secure communication link.

Operating Instructions

1. Powering On/Off

• To power on the transmitter, slide the "POWER" switch to the "ON" position.
• To power off, slide the "POWER" switch to the "OFF" position.
• Always power on the transmitter first, then the receiver. Power off the receiver first, then the transmitter.

2. Menu Navigation

The 4GRS features a jog dial and various buttons for menu navigation. Rotate the jog dial to scroll through options and press it to select. Use the adjacent buttons for specific functions as indicated on the display.

3. Basic Adjustments

• Servo Reverse: Access the "REVERSE" menu to change the direction of servo movement.
• End Point Adjustment (EPA): Use the "EPA" menu to set the maximum travel for each servo channel. This prevents over-stressing servos.
• Dual Rate: Adjust steering and throttle dual rates via dedicated menus to change sensitivity.
• Fail-Safe: Configure fail-safe settings in the "F/S" menu to ensure your model reacts predictably in case of signal loss.

4. Advanced Functions

The 4GRS offers extensive customization. Refer to the detailed "Futaba 4GRS Advanced Programming Manual" for in-depth instructions on:

• Programmable Mixing (PMIX)
• 4WS Mixing for four-wheel steering vehicles
• Dual ESC Mixing for specialized drive systems
• Gyro Mixing and CPS Mixing
• Telemetry Sensor Setup and Display (requires optional sensors)
• Model Memory Management and Data Transfer

Maintenance

• Cleaning: Wipe the transmitter and receiver with a soft, dry cloth. Avoid using solvents or harsh chemicals.
• Storage: Store the radio system in a cool, dry place away from direct sunlight and extreme temperatures. Remove batteries from the transmitter if storing for extended periods.
• Battery Care: Replace AA batteries in the transmitter when the low battery warning appears. Ensure rechargeable batteries are charged according to their manufacturer's instructions.
• Antenna Care: Handle the transmitter antenna with care to prevent damage. Ensure the receiver antenna is positioned correctly for optimal signal reception.

Troubleshooting

• No Power: Check transmitter batteries for correct installation and charge level. Ensure the receiver is properly connected to a power source.
• No Control: Verify that the transmitter and receiver are properly bound. Check all servo and ESC connections. Ensure the model memory selected on the transmitter matches the model being operated.
• Erratic Operation: Check for interference sources. Ensure receiver antenna is not damaged or obstructed. Verify all wiring is secure.
• Telemetry Data Not Displaying: Ensure optional telemetry sensors are correctly connected and configured in the transmitter menu.

Specifications

Transmitter (T4GRS) Specifications:

• Operating System: S-FHSS, T-FHSS
• Frequency: 2.4GHz
• Current Drain: 150mA or less
• Power Supply: AA Dry cell batteries x 4
• Dimensions: Approximately 10.13 x 10.13 x 4.63 inches
• Weight: Approximately 2.3 pounds

Figure 3: The Futaba 4GRS Transmitter shown in hand for scale, indicating its approximate dimensions of 11 inches (26 cm) in height. This provides a visual reference for its physical size.

Receiver (R304SB) Specifications:

• System: T-FHSS 2.4GHz
• Channels: 4
• Power Requirement: 3.7V-7.4V
• Size: 35.1 x 23.2 x 8.5 mm
• Weight: 0.23 oz

Warranty and Support

The Futaba 4GRS Radio System comes with a one-year limited warranty through Hobby Services, effective from the date of purchase. Please retain your proof of purchase for warranty claims.

For technical support, service, or further information, please contact Hobby Services or refer to the official Futaba website.