Radiomaster RP1 ExpressLRS Nano Receiver

The Radiomaster RP1 is an ultra-compact ExpressLRS nano receiver designed for FPV drones, RC aircraft, and racing quadcopters requiring minimal weight and form factor without compromising signal reliability. Professional FPV pilots, drone racing competitors, and RC enthusiasts rely on this receiver for its low-latency communication, exceptional range, and robust interference immunity in demanding flight environments. This nano receiver solves the critical challenge of integrating reliable long-range control systems into weight-sensitive platforms while maintaining sub-millisecond latency essential for competitive racing and acrobatic flight.

Product Overview

The Radiomaster RP1 ExpressLRS Nano Receiver operates on the 2.4GHz ISM band using the proprietary ExpressLRS protocol, which implements FHSS (Frequency Hopping Spread Spectrum) technology to achieve exceptional range and interference rejection. The receiver features a high-sensitivity RF front-end capable of maintaining stable links at distances exceeding 50 kilometers in open terrain, while the adaptive packet rate system automatically optimizes latency based on flight conditions. With dimensions measuring just 17x11x5mm and weighing under 1.5 grams, the RP1 integrates seamlessly into micro and nano-class aircraft where every milligram impacts flight performance and endurance.

What distinguishes the RP1 from competing nano receivers is its implementation of true diversity reception with dual antenna connectors, allowing pilots to optimize antenna placement for maximum signal penetration in complex RF environments. The receiver supports both PWM and serial telemetry protocols, enabling real-time RSSI feedback, voltage monitoring, and GPS data transmission back to the transmitter. The firmware is open-source and user-updatable via USB, allowing pilots to customize receiver behavior, adjust failsafe parameters, and access the latest protocol improvements without requiring specialized programming equipment.

Key Specifications

Specification	Details
Product Type	ExpressLRS Nano Receiver Module
Brand	Radiomaster
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
Operating Frequency	2.4GHz ISM Band
Modulation	FHSS with ExpressLRS Protocol
Maximum Range	50+ kilometers line-of-sight
Latency	Sub-millisecond (configurable 50Hz to 500Hz packet rate)
Dimensions	17 x 11 x 5 mm
Weight	Approximately 1.4 grams
Power Input	4.5V to 6V DC
Current Draw	80-120mA typical operation
Output Interfaces	PWM (4 channels) and Serial UART for telemetry
Antenna Connectors	Dual IPEX/U.FL for diversity reception

Key Features

• Ultra-Nano Form Factor: Weighs under 1.5 grams with dimensions of 17x11x5mm, enabling integration into the most weight-critical micro-class platforms and FPV racing frames
• Dual Antenna Diversity: Dual IPEX connectors support true diversity reception, automatically selecting the antenna with strongest signal to eliminate dropouts in multipath RF environments
• Configurable Packet Rates: Adaptive refresh rates from 50Hz to 500Hz allow pilots to balance latency requirements against range and power consumption based on application demands
• Open-Source Firmware: User-updatable ExpressLRS firmware via USB enables customization of failsafe behavior, RSSI thresholds, and access to latest protocol enhancements
• Integrated Telemetry: Serial UART interface transmits real-time receiver RSSI, battery voltage, and GPS coordinates back to compatible transmitters for live flight monitoring
• Robust FHSS Technology: Frequency hopping spread spectrum provides exceptional interference immunity in crowded RF environments and automatic recovery from temporary signal loss

Applications and Use Cases

• FPV Racing Drones: Professional and amateur FPV racing pilots utilize the RP1 for its sub-millisecond latency and compact form factor, critical for competitive racing where response time determines race outcomes
• Micro FPV Cinematography: Content creators integrate the nano receiver into ultra-lightweight FPV platforms for cinematic aerial footage with extended flight times and reliable long-range control
• RC Acrobatic Aircraft: Fixed-wing and rotorcraft pilots rely on the RP1 for precision control during aerobatic maneuvers, where low latency and predictable response characteristics are essential for safe flight
• Autonomous Research Platforms: Robotics researchers and UAV developers use the RP1 as a reliable control link for autonomous systems requiring real-time telemetry feedback and configurable failsafe parameters
• Long-Range Exploration: Enthusiasts flying beyond visual line-of-sight utilize the 50+ kilometer range capability for exploring remote terrain while maintaining responsive control authority

How to Use

Installation of the Radiomaster RP1 requires connection of the receiver to your flight controller's PWM input pins or UART serial port, depending on your preferred control protocol. Begin by identifying the VCC, GND, and signal pins on your specific flight controller model, then carefully solder the RP1's power and output leads using 30-32 AWG wire to minimize weight. The receiver operates from 4.5V to 6V, making it compatible with standard 5V regulated outputs from most flight controllers, though some pilots prefer direct LiPo connection with appropriate voltage regulation for improved noise immunity. Attach your preferred antenna configuration to the dual IPEX connectors, positioning antennas orthogonally (perpendicular to each other) for optimal diversity performance.

Before flight, bind the receiver to your ExpressLRS transmitter by placing both devices in binding mode, typically achieved by holding the bind button on the transmitter for 3-5 seconds until the LED indicates pairing mode. Configure your flight controller software to recognize the RP1's output format and set appropriate failsafe parameters such as throttle cutoff or return-to-home activation if signal loss exceeds your configured timeout threshold. Update the receiver firmware to the latest stable version using the ExpressLRS configurator tool to ensure compatibility with your transmitter firmware and access the most recent performance optimizations. Test all control channels on the ground before flight, verifying that stick inputs produce expected control surface movements and that telemetry data displays correctly in your ground station software.

Frequently Asked Questions

What is the maximum range of the Radiomaster RP1 receiver?

The RP1 achieves effective ranges exceeding 50 kilometers in line-of-sight conditions with optimal antenna placement and clear RF path. In real-world FPV flying scenarios with obstacles and terrain, typical usable range is 10-30 kilometers depending on antenna quality, transmitter power, and environmental RF noise. The FHSS protocol provides automatic frequency hopping to maintain link integrity even in congested 2.4GHz environments where multiple devices operate simultaneously.

Can I use the RP1 with my existing RC transmitter?

The Radiomaster RP1 is specifically designed for ExpressLRS transmitters and cannot be used with traditional RC transmitters using PPM, SBUS, or other legacy protocols. You must use a compatible ExpressLRS transmitter module such as the Radiomaster TX16S, Jumper T-Lite, or other certified ExpressLRS TX modules. The receiver's protocol is not backward compatible with non-ExpressLRS systems.

How do I update the firmware on the RP1?

Connect the receiver to your computer using a USB-to-UART adapter connected to the receiver's serial pins, then use the ExpressLRS Configurator software available free from the official GitHub repository. Select your receiver model, choose the desired firmware version and configuration options, then click flash to upload the new firmware. The process typically takes 30-60 seconds and includes automatic verification to ensure successful programming.

What packet rate should I use for racing versus long-range flying?

For competitive FPV racing, use 500Hz packet rate to achieve the lowest possible latency of approximately 2 milliseconds, providing maximum responsiveness for high-speed maneuvers. For long-range flying and cinematography, reduce packet rate to 50-100Hz to extend range and reduce power consumption, accepting slightly higher latency of 10-20 milliseconds which remains imperceptible for slower flying. The adaptive nature of ExpressLRS allows changing packet rates without rebinding, enabling quick configuration changes between different flying styles.

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
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• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy Radiomaster RP1 ExpressLRS Nano Receiver Online in India

Purchase the Radiomaster RP1 ExpressLRS Nano 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 Radiomaster RP1 Exp