FrSky RXSR Ultra Mini Receiver

The FrSky RXSR Ultra Mini Receiver is a compact, high-performance radio control receiver designed for lightweight drone and RC aircraft applications requiring minimal weight and space constraints. Professional FPV pilots, racing drone enthusiasts, and RC modelers use this receiver for its exceptional signal stability and ultra-compact form factor that integrates seamlessly into size-restricted airframes. This receiver solves the critical challenge of maintaining reliable 2.4GHz ACCST signal reception while keeping total system weight under strict limits for small-scale aerial platforms.

Product Overview

The FrSky RXSR operates on the proven 2.4GHz ACCST protocol, delivering secure, low-latency communication between compatible FrSky transmitters and receiver-equipped aircraft. The receiver employs advanced frequency-hopping spread spectrum technology to ensure immunity from interference in congested RF environments. Its ultra-compact dimensions measuring just 23x14x7mm make it ideal for integration into micro-class drones, small FPV racing quads, and lightweight RC airplanes where every gram matters for flight performance and battery endurance.

The RXSR Ultra Mini features a robust PCB design with integrated failsafe programming capabilities, allowing pilots to configure automatic safety responses in case of signal loss. The receiver supports SBUS output protocol, enabling direct connection to modern flight controllers and ESCs without additional signal conversion hardware. Built-in telemetry support allows reverse data transmission from the aircraft back to the transmitter, providing real-time feedback on battery voltage, signal strength, and other critical flight parameters during operation.

Key Specifications

Specification	Details
Product Type	2.4GHz ACCST Radio Control Receiver
Brand	FrSky
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Frequency Band	2.4GHz ACCST Protocol
Dimensions	23 x 14 x 7mm
Weight	Approximately 1.5 grams
Output Protocol	SBUS
Operating Voltage	3.5V to 9V DC
Number of Channels	8 Channels

Key Features

• Ultra-Compact Form Factor: 23x14x7mm dimensions and 1.5g weight enable integration into micro-drones and weight-critical RC applications without compromising aerodynamic performance
• SBUS Protocol Output: Direct compatibility with modern flight controllers eliminates need for PPM signal conversion, reducing component count and potential failure points
• Integrated Failsafe Programming: Configurable automatic responses to signal loss including throttle cut, level recovery, or return-to-home sequences for enhanced flight safety
• Telemetry Capable: Bidirectional communication allows transmission of battery voltage, RSSI signal strength, and custom sensor data back to FrSky transmitters for real-time flight monitoring
• 8-Channel Support: Sufficient channel capacity for complex aircraft configurations including throttle, ailerons, elevator, rudder, flaps, landing gear, and auxiliary functions
• Frequency-Hopping ACCST: Advanced spread spectrum technology provides robust interference rejection in crowded 2.4GHz environments typical of RC flying fields

Applications and Use Cases

• FPV Racing Drones: Lightweight receiver ideal for 250mm racing quads where minimal weight preserves acceleration, top speed, and flight time while maintaining reliable signal lock during high-speed maneuvers
• Micro FPV Platforms: Perfect for sub-250g camera drones and small FPV wings requiring regulatory compliance while maintaining professional-grade control responsiveness and telemetry feedback
• Lightweight RC Airplanes: Enables control of electric gliders, park flyers, and hand-launch aircraft where receiver weight directly impacts flight duration and aerodynamic efficiency
• RC Helicopters and Multicopters: Compact size facilitates installation in confined fuselage spaces on scale helicopter models and custom multirotor platforms with specialized configurations

How to Use

Begin setup by binding the RXSR receiver to your compatible FrSky transmitter using the standard binding procedure: power the receiver with the bind plug installed, then activate bind mode on your transmitter until the receiver LED confirms successful pairing. Connect the SBUS output pin to your flight controller's SBUS input port, ensuring proper voltage levels between 3.5V and 9V DC from your LiPo battery or dedicated receiver power supply. Configure failsafe settings through your flight controller's software to define desired behavior during signal loss, typically setting throttle to minimum and enabling stabilization modes for safe descent.

For telemetry operation, connect a compatible FrSky telemetry module to your transmitter and configure the receiver's telemetry output in your flight controller settings. Verify signal reception by checking the receiver LED status during preflight checks, ensuring steady illumination indicating active signal lock. Perform range tests before each flying session by walking away from the aircraft while monitoring transmitter signal strength indicators, confirming reliable control response at your intended flying distance. Always validate failsafe functionality on the ground before flight operations to ensure your configured safety responses function as intended.

Frequently Asked Questions

Is the FrSky RXSR compatible with non-FrSky transmitters?

No, the RXSR receiver is exclusively compatible with FrSky 2.4GHz ACCST transmitters such as the Taranis, Horus, and QX7 series. The proprietary ACCST protocol prevents binding with receivers or transmitters from other manufacturers. If you use a different brand transmitter, you will need a receiver designed for that specific protocol.

What is the maximum range of the RXSR receiver?

The RXSR typically achieves reliable control range of 1-2 kilometers in open space with clear line of sight, though actual range depends on antenna orientation, environmental interference, and transmitter power output. Always perform range testing specific to your flying location before flight operations, as buildings, power lines, and other RF sources can significantly reduce effective range.

Can I use the RXSR on aircraft heavier than 250 grams?

Yes, the RXSR receiver works on any aircraft regardless of weight, as long as your transmitter and receiver are compatible FrSky components. The weight advantage of this receiver is most beneficial for lightweight applications, but it functions equally well on larger platforms where weight is less critical.

Does the RXSR require a separate power supply or can it run from the flight controller?

The RXSR can be powered directly from your flight controller's receiver output port if it provides 5V regulated power, or from a dedicated BEC (Battery Eliminator Circuit) set to 5V output. Ensure your power source can deliver sufficient current for the receiver and any connected telemetry modules, typically 100-200mA depending on configuration.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
• Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy FrSky RXSR Ultra Mini Receiver Online in India

Purchase the FrSky RXSR Ultra Mini Receiver online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on FrSky RXSR Ultra Mini Receiver with fast shipping and expert support.

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