Overview
The Spektrum AR20400T 20-Channel PowerSafe Telemetry Receiver is a feature-packed, professional-grade receiver designed specifically for high-performance RC aircraft that demand exceptional power handling and advanced telemetry capabilities. This receiver represents the pinnacle of Spektrum's engineering for giant-scale aeroplanes, jets, turbine-powered aircraft, and any model requiring numerous servos and accessories that draw significant electrical current. Whether you're flying a competition-grade IMAC aerobatic model, a high-performance 3D aircraft, or a massive turbine-powered jet, the AR20400T delivers the reliability, power management, and real-time flight data you need to fly with confidence.
This is not a beginner's receiver—it's engineered for experienced RC pilots and dedicated enthusiasts who understand the demands of high-current systems and appreciate advanced telemetry integration. The AR20400T integrates seamlessly with Spektrum DSM2 and DSMX transmitters, offering complete wireless programmability, dual battery redundancy through the patented PowerSafe system, and comprehensive telemetry logging without the need for complicated additional modules or external sensors. If you're serious about RC aviation in the UK and beyond, the AR20400T is the receiver that delivers professional-grade performance and peace of mind.
The receiver's compact dimensions (69mm length, 65mm width, 18mm height) and lightweight design of just 86 grams belie its substantial capabilities. Despite its small footprint, it manages high-current loads up to 35A continuously with peak burst capability of 50A, making it suitable for everything from complex multi-servo retractable landing gear systems to high-power electric motors and turbine jet engines. Its integration of full-range telemetry with a built-in barometer means you'll have access to crucial flight data including altitude, variometer readings, battery capacity consumption, and more—all without purchasing separate sensor modules.
Key Features
- Patented PowerSafe Redundancy System — The dual 13 AWG battery input leads with IC3 connectors provide true dual battery redundancy, allowing the AR20400T to intelligently manage power between two separate batteries with automatic failover. If one battery fails or shorts out, the other seamlessly takes over without interruption, which is essential safety redundancy for high-value aircraft and demanding applications where power loss is not an option.
- High-Current Power Management — Designed to handle continuous draw of up to 35A with 50A maximum burst capability, making this receiver perfect for power-hungry aircraft and high-current servo applications found on giant-scale aeroplanes, jets, and models with complex retractable systems, lighting rigs, and high-torque servo banks.
- Integrated Full-Range Telemetry System — Built-in barometer provides altitude and variometer telemetry data without requiring additional sensor modules, whilst integrated battery capacity monitoring automatically tracks and reports the mAh consumed by your servos, retracts, lights, and other systems during flight.
- Black Box Flight Logging — When a Micro SD card is inserted, the receiver automatically logs all flight information, battery status, and telemetry data, allowing you to review flight performance over time for diagnostic purposes and performance optimisation.
- Forward Programming Capability — All receiver adjustments including failsafe settings, servo frame rate configuration (up to 11ms for lightning-fast response), and system parameters can be configured wirelessly directly from your Spektrum transmitter, eliminating the need for separate computers or programming devices.
- Four SRXL2 Remote Receivers — Includes four remote serial telemetry receivers (one SPM4651T and three SPM9747 units) that utilise Spektrum's MultiLink technology to eliminate reflected signal fading and antenna blind spots, ensuring a rock-solid connection between transmitter and aircraft across the full 2.4GHz band.
- Proprietary Soft Switch Design — The included soft switch allows servo current to be routed around the switch mechanism itself, meaning even if the switch fails, power continues flowing to your aircraft systems uninterrupted—a critical safety feature for high-altitude and remote flying.
- 12V System Capability — Forward programmable to support 12-volt servo applications, expanding compatibility with specialist servo systems and high-voltage actuators used in advanced giant-scale models.
- SRXL2 One-Wire Connectivity — Single-wire SRXL2 connections simplify installation and integrate seamlessly with supported devices including Spektrum Smart ESCs, eliminating the tangle of sensor wires, expansion modules, and additional connectivity hardware.
- Integrated Telemetry Sensor Ports — Built-in connection points for RPM sensors, flight pack voltage sensors, temperature sensors, and an X-Bus expansion port allow you to build a comprehensive telemetry system tailored to your aircraft's specific needs.
- Micro USB Port — Enables easy firmware updates via the Spektrum PC Programmer Application and simplifies product registration and warranty management.
- Status LED Indicator System — Provides colour-coded visual feedback during startup, operation, and if any issues are detected, with specific flash patterns indicating power status, connectivity, recording status, and error conditions.
- Rubber Grommet Hard Mounting — Minimalist labelling and rubber grommet mounting points enable clean, professional aircraft installations whilst reducing vibration transmission to sensitive components.
- High-Speed 11ms Frame Rates — When used with compatible Spektrum DSMX/DSM2 transmitters capable of 11ms operation, delivers exceptional input-to-output response times perfect for aggressive 3D flying, IMAC competition, and high-performance aerobatic applications.
Technical Performance
The AR20400T represents Spektrum's commitment to engineering receivers for the most demanding RC aviation applications. Built with a robust power bus architecture, this receiver manages high-current loads without requiring a separate power distribution system, allowing the receiver itself to serve as the primary power distribution hub for your entire electrical system. The dual 13 AWG battery input leads with IC3 connectors accept larger capacity battery packs, and the patented PowerSafe redundancy system isolates each battery circuit so that the loss of one does not compromise the other. Operating from 3.5V to 12.6V input range, the receiver accommodates 2S, 3S, and higher cell-count LiPo systems, and through forward programming, can be optimised for 12V servo applications. The integrated barometer provides altitude and variometer data across the full flight envelope, whilst integrated battery capacity monitoring tracks actual milliamp-hour consumption flight-to-flight. The receiver's compact dimensions (69mm × 65mm × 18mm) and light weight of 86 grams allow installation in models where space is at a premium, whilst its MC3 resolution (2048) ensures smooth, precise servo control even during aggressive manoeuvres. With SRXL2 connectivity supporting one-wire installation to compatible devices, integration of modern Spektrum systems is streamlined and reliable. The included soft switch provides a fail-safe power routing mechanism, ensuring that switch failure does not cascade into system power loss—a critical safety consideration for expensive aircraft operating at altitude.
What's in the Box
- AR20400T 20 Channel PowerSafe Receiver
- SPM4651T SRXL2 Remote Serial Telemetry Receiver
- Three SPM9747 SRXL2 DSMX Remote Receivers
- 9-inch SRXL2 Remote Receiver Extension
- 12-inch SRXL2 Remote Receiver Extension
- 24-inch SRXL2 Remote Receiver Extension
- 36-inch SRXL2 Remote Receiver Extension
- Two Battery IC3 Connectors
- Two Charge Receptacles
- Aircraft Telemetry Volt Sensor
- Soft Switch
- Instruction Manual (English, German, French, and Italian versions available)
What You Need to Complete
- Spektrum DSM2 or DSMX compatible RC transmitter capable of binding with SRXL2 receivers
- Suitable RC aircraft airframe configured for receiver installation
- LiPo battery pack (3.5V to 12.6V) with IC3 connectors for powering the receiver and servos
- RC servo motors appropriate for your aircraft application
- Optional: Micro SD card (not included) for Black Box telemetry flight logging functionality
- Optional: Compatible Spektrum telemetry sensors (RPM, airspeed, temperature, GPS modules) for expanded data collection
- Optional: Spektrum Smart ESC for integrated one-wire telemetry capability
Frequently Asked Questions
- Is the AR20400T suitable for my giant-scale RC aeroplanes? — Yes, this receiver is specifically designed for giant-scale aircraft, jets, and any model requiring numerous high-current servos. The PowerSafe redundancy system and high-current capacity (35A continuous, 50A burst) make it ideal for complex multi-servo systems including retractable landing gear, flaps, and other accessories typical of large-scale models.
- What is the PowerSafe redundancy system and why do I need it? — The PowerSafe redundancy system uses dual battery inputs with isolated circuits, meaning each battery powers a separate output section. If one battery fails or shorts, the other automatically takes over seamlessly without loss of power to your aircraft systems. This is critical for expensive aircraft where power loss during flight could result in catastrophic damage.
- Can I use this receiver with my existing Spektrum transmitter? — Yes, the AR20400T is compatible with all Spektrum DSM2 and DSMX transmitters. It is not compatible with the AS3000 Stabilisation Module or the DSM2 AIRMOD JR Module (SPMMSJR720). Check your transmitter's manual to confirm DSM2 or DSMX compatibility.
- What battery voltage does this receiver require? — The AR20400T operates with input voltage ranging from 3.5V to 12.6V, making it compatible with 2S, 3S, 4S, and higher cell-count LiPo batteries. It can also be forward programmed to optimise performance for 12V servo applications.
- What makes the AR20400T different from standard receivers? — Unlike standard receivers, the AR20400T integrates full-range telemetry with a built-in barometer, battery capacity monitoring, Black Box flight logging, dual battery redundancy, and can manage continuous current draws of 35A (50A peak). These features are essential for high-performance applications like IMAC competition, 3D aerobatics, and jet models where reliability and real-time data are paramount.
- Do I need to buy additional telemetry sensors? — No, the receiver includes integrated telemetry sensors for battery voltage and receiver pack energy monitoring, plus a built-in barometer for altitude and variometer data. However, it has ports for optional RPM, temperature, and other Spektrum telemetry sensors if you want to expand your data collection capabilities.
- How do I enable the Black Box flight logging? — Simply insert a Micro SD card into the receiver's SD card slot. Flight information, battery status, and telemetry data will be automatically logged during operation. Note that Micro SD cards are not included with the receiver.
- Can I configure settings without a computer? — Yes, the AR20400T features forward programming, allowing you to adjust all settings including failsafe, servo frame rate, and more directly from your Spektrum transmitter's programming menu. No computer or mobile device is required for basic setup and adjustments.
- What is SRXL2 connectivity and why should I care? — SRXL2 is Spektrum's single-wire serial protocol that simplifies receiver wiring and enables seamless integration with compatible devices like Spektrum Smart ESCs. It reduces clutter in your aircraft and provides telemetry data without additional sensor modules or expansion boards.
- Is the AR20400T waterproof? — The receiver is designed for RC aircraft use and features a compact, integrated design. Whilst aircraft typically don't encounter water exposure like RC cars or boats do, the receiver is built to withstand vibration and the electrical demands of flight. Refer to the instruction manual for specific environmental operating guidelines.
- What do the status LED colours and flash patterns mean? — White blinking indicates initialisation; red indicates a failure condition; two blinks show 3S power detection with protection engaged; one blink indicates no remote detected or insufficient remotes; solid blue means ready with SD recording active; solid green means ready without SD recording.
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 SPM AR20400T 20 Channel PowerSafe Telemetry Receiver P-SPMAR20400T 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.
