Futaba R304SB-E 4-Channel (PWM) Surface Receiver with S.BUS for Telemetry T-FHSS (Internal Aerial) FUT05102601-3

Overview

The Futaba R304SB-E 4-Channel (PWM) Surface Receiver with S.BUS for Telemetry T-FHSS (Internal Aerial) is a compact and sophisticated radio control receiver designed for precision RC car enthusiasts in the UK who demand reliability in a tiny package. This advanced receiver represents the pinnacle of Futaba's engineering expertise, specifically optimised for indoor use on smaller carpet track type cars where space is at a premium. Whether you're running an electric RC buggy, a touring car, or any surface-based RC vehicle, this receiver delivers the performance and compatibility you need with a form factor that won't weigh down your model or consume valuable installation space.

Built on Futaba's renowned T-FHSS (Frequency Hopping Spread Spectrum) telemetry platform, the R304SB-E provides a secure, interference-resistant digital link between your transmitter and receiver. The integration of S.BUS (Serial BUS) technology streamlines wiring and reduces the complexity of your RC car's electronics installation, making it an ideal choice for modern RC builds. This receiver is particularly valued by competitive RC car UK enthusiasts and serious hobbyists who appreciate the combination of compact dimensions, lightweight construction, and sophisticated telemetry capabilities that set Futaba apart from other manufacturers.

At just 35.1 × 23.2 × 12.5 millimetres and weighing a mere 7 grams, the R304SB-E fits seamlessly into tight engine bays and compact chassis designs. Its internal antenna eliminates the need for external antenna runs, further reducing installation complexity and protecting your receiver in rough-and-tumble bashings. With an operating voltage range of 4.0–8.4 volts and a rated voltage of 4.8–7.4 volts, this receiver is compatible with a wide range of modern RC batteries and power systems, from standard 2S LiPo batteries through to higher voltage setups used in competitive racing applications.

Key Features

• T-FHSS Telemetry System — Futaba's proprietary frequency-hopping spread spectrum technology provides a secure, stable digital connection with real-time telemetry feedback, allowing you to monitor your RC car's performance and systems whilst in operation, which is essential for competitive racing and serious hobbyists.
• 4-Channel PWM Control — This receiver provides four independent channels of proportional control via PWM (Pulse Width Modulation), offering the flexibility to operate your throttle, steering, and up to two auxiliary functions simultaneously, making it suitable for a wide variety of RC car configurations and applications.
• S.BUS2 Protocol Support — The integration of S.BUS2 serial communication protocol significantly reduces wiring complexity compared to traditional multi-wire PWM systems, allowing multiple servos and digital devices to be controlled through a single data line, which is particularly valuable in space-constrained installations.
• Internal Antenna Design — The integrated antenna eliminates the need for external antenna routing, providing protection from physical damage during transport, storage, and use, whilst maintaining excellent range and signal stability for typical RC car track environments.
• Compact and Lightweight Construction — Measuring just 35.1 × 23.2 × 12.5 millimetres and weighing only 7 grams, this receiver fits into virtually any RC car chassis without requiring modification or compromising component placement, making it ideal for tight-fitting modern designs.
• Wide Operating Voltage Range — Compatible with battery voltages from 4.0 to 8.4 volts operationally, with a rated input range of 4.8–7.4 volts, this receiver works reliably with 2S LiPo packs and can handle voltage fluctuations and peak charges without issue, providing flexibility across different power systems.
• Indoor Optimisation — Specifically engineered for carpet track environments and smaller track cars, the R304SB-E's frequency selection and antenna tuning are optimised for the controlled RF environment of indoor facilities, ensuring superior performance compared to outdoor-focused receivers in these applications.

Technical Performance

The Futaba R304SB-E represents a significant advancement in compact RC receiver design, combining military-grade frequency-hopping technology with user-friendly modern protocols. The T-FHSS digital system automatically selects the best available frequency from a pool of 125 different frequency channels, continuously hopping between them in a predetermined pattern that only your transmitter knows, making the system virtually immune to interference from other RC operators and Wi-Fi networks — a critical advantage at busy UK RC clubs and competitions. The dual protocol support for both traditional PWM and modern S.BUS2 serial communication means this receiver bridges the gap between legacy RC equipment and contemporary digital systems, allowing you to use either individual servo connectors or daisy-chained digital devices depending on your specific setup requirements. The engineering inside this tiny 7-gram package reflects decades of Futaba's research and development; the circuit design minimises power consumption to preserve battery runtime, whilst the component selection ensures reliable operation across the full operating voltage envelope from 4.0 to 8.4 volts. The internal antenna, whilst compact, is expertly matched to the 2.4 GHz frequency band used by T-FHSS, providing range and reliability comparable to larger receivers with external antennas when used in the indoor environments for which it is optimised. All components are mounted on a rigid PCB (printed circuit board) with conformal coating for protection against moisture and dust ingress, ensuring the receiver will withstand the demanding conditions of regular RC car use including occasional spilled fuel, track dust, and high-speed impacts.

What's in the Box

• 1× Futaba R304SB-E 4-Channel PWM/S.BUS Receiver with integrated antenna

What You Need to Complete

• Futaba T-FHSS telemetry compatible transmitter (radio control unit)
• Compatible servo motors with PWM or S.BUS connectors depending on your desired setup configuration
• LiPo or other DC power source within the 4.8–7.4 volt rated range (2S LiPo recommended)
• Servo extensions or S.BUS cables to connect between receiver and servos

Frequently Asked Questions

• Can I use the Futaba R304SB-E in GP (Grand Prix) cars or high-performance racing vehicles? — No. The manufacturer explicitly states never to use the R304SB-E in GP cars due to the demands and electrical characteristics of these vehicles. The receiver is specifically designed and rated for smaller carpet track type cars and standard electric RC vehicles. Using it in GP cars may result in damage to the receiver or poor performance.
• Is this receiver suitable for beginners in RC car UK racing? — The R304SB-E is best suited to intermediate and advanced RC car users who understand receiver installation, servo configuration, and the basics of radio system setup. Its compact size requires careful installation planning, and the S.BUS protocol, whilst simpler than multi-wire setups, requires compatible equipment. Beginners should consider larger, more forgiving receivers with detailed instruction manuals.
• What battery voltage does the Futaba R304SB-E need and what size LiPo should I use? — The receiver is rated for 4.8–7.4 volts and operates across 4.0–8.4 volts. A standard 2S LiPo battery (nominally 7.4 volts fully charged, dropping to 6.0 volts under load) is ideal and falls perfectly within the rated range. You may also use 2S NiMH batteries (approximately 4.8 volts), though LiPo is recommended for modern RC cars due to superior performance characteristics.
• What is the difference between this R304SB-E with internal antenna and the external antenna version? — The internal antenna receiver (this model) offers a more compact installation footprint and slightly reduced risk of antenna damage during crashes. The external antenna version (if available) may offer marginally extended range for outdoor use, though for the indoor carpet track applications this receiver is optimised for, the internal antenna provides perfectly adequate performance and coverage.
• Will the R304SB-E work with analogue servos? — The manufacturer explicitly warns that the use of analogue servos with the R304SB-E may cause servo trouble. Digital servos are recommended as they interact more favourably with the receiver's digital protocols and are better equipped to handle the characteristics of the T-FHSS signal.
• What is S.BUS2 and why should I care about it? — S.BUS2 is Futaba's serial communications protocol that allows multiple servos and digital devices to be controlled through a single data line rather than multiple individual PWM wires. This dramatically reduces wiring complexity, saves weight, and reduces the physical footprint of your receiver installation — critical advantages when building compact RC cars with tight component spacing.
• Can I bind this receiver to my existing Futaba transmitter? — Yes, the R304SB-E is compatible with all Futaba T-FHSS surface radio systems. The binding process is straightforward and thoroughly documented in the receiver manual, which can be downloaded from the Futaba UK website.
• How do I fit a receiver this small into my RC car without it getting damaged? — The compact 7-gram design is intended for installation in foam-lined receiver boxes mounted low in the chassis or in dedicated receiver compartments. Always use protective foam or protective wrapping around the receiver, ensure connectors are secure and strain-relieved, and position the integrated antenna away from large metal components that might shield the signal.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Futaba R304SB-E 4-Channel (PWM) Surface Receiver with S.BUS for Telemetry T-FHSS (Internal Aerial) FUT05102601-3 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.