FrSky Tandem TD SR18 2.4GHz+900MHz Dual-Band 18-Channel Receiver
Overview
The TD SR18 operates simultaneously on 2.4GHz and 900MHz Tandem dual-band for low-latency control and long-range reliability. The triple antenna design (2x2.4GHz, 1x900MHz) provides multi-directional coverage. Dual XT30 power inputs enable redundant power supply with automatic higher-voltage draw. 18 configurable channel ports can each be assigned as PWM, SBUS, FBUS, or S.Port — FBUS enables single-wire bidirectional telemetry with ADV sensors and Neuron ESC. The built-in black box records power and signal data during flight.
 
ADV Stabilizer
The built-in ADV Stabilizer uses a 3-axis gyroscope and accelerometer supporting Stabilization, Auto-Level, Hover, and Knife-Edge flight modes. Advanced mode adds stab file sharing, programmable parameters, and developer access.
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Why We Recommend the TD SR18
The TD SR18 is our top pick for complex fixed-wing builds where you need 18 configurable channels, dual-band Tandem range, and built-in ADV stabilization in one receiver. It's the flagship pairing for the X20 Pro AW, X20S, and X18 series. FPV Builds RC provides U.S.-based product support and setup guidance for FrSky products purchased through our store.
 
Frequently Asked Questions:Which FrSky transmitters are compatible with the TD SR18?
The TD SR18 works with all FrSky Tandem series transmitters: X18, X18S, X18SE, X18RS, X20, X20S, X20RS, X20 Pro, X20 Pro AW, and X20 R. Any radio running the Tandem (TD) dual-band protocol — or a TD-capable RF module — will bind to the SR18. See our full transmitter lineup at https://www.fpvbuildsrc.com/frsky-transmitters
 
What is the Tandem dual-band system and why does it matter?
Tandem (TD) receivers operate simultaneously on 900MHz and 2.4GHz. The 2.4GHz link provides low latency and fast response; the 900MHz link gives you extended range and superior penetration through interference. Both bands are active at the same time — not failover — so you get the benefits of both on every flight.
 
What is the ADV Stabilizer and which aircraft benefit from it?
The ADV (Advanced) Stabilizer is a built-in gyro/accelerometer system that adds self-leveling, auto-level, hover, and knife-edge flight modes. It's ideal for scale warbirds, gliders, and large fixed-wing aircraft where gyro stabilization replaces a separate flight controller. The ADV mode adds programmable parameters and stab file sharing not available on standard S-series stabilized receivers.
 
What does 18 configurable channel ports mean in practice?
Each of the 18 ports can be independently assigned as PWM, SBUS Out, FBUS, or S.Port — so you're not locked into a fixed servo/digital mix. CP1 also doubles as SBUS In for signal redundancy. For complex aircraft with many servos, ESCs, and sensors, you get one receiver handling everything without external decoders.
 
How do I set up FBUS for telemetry sensors?
Assign any channel port to FBUS in the receiver settings (via ETHOS on your Tandem radio). Then daisy-chain ADV sensors, the Neuron ESC, or other FBUS-capable devices to that port. A single wire carries bidirectional data — no S.Port splitter needed. Full telemetry shows up live on your radio screen.
 
Does the TD SR18 support OTA firmware updates?
Yes. Firmware updates are delivered over-the-air directly from your Tandem transmitter via ETHOS — no USB cable or computer required. Keep the receiver current to access the latest stabilization improvements and protocol features.
 
What is the dual-power input and do I need to use both XT30 ports?
The TD SR18 has two XT30 power inputs for redundant power — the receiver draws from whichever supply has the higher voltage automatically. You can run a single power source using just one XT30 port; the second adds a safety net for turbine and large-scale aircraft where a power failure would be costly.
 
How do I configure the TD SR18's stabilization in ETHOS?
Current FrSky stabilized receivers are configured through the applicable Stabilizer Config/device configuration functions in ETHOS. Receiver orientation, aircraft type, stabilization mode, channel assignments, and related settings should be configured for the specific receiver and aircraft installation. Follow the current FrSky/ETHOS instructions for the TD SR18.
 
How do I configure the TD SR18's stabilization in ETHOS?
Current FrSky stabilized receivers are configured through the applicable Stabilizer Config/device configuration functions in ETHOS. Receiver orientation, aircraft type, stabilization mode, channel assignments, and related settings should be configured for the specific receiver and aircraft installation. Follow the current FrSky/ETHOS instructions for the TD SR18.
 
Does FPV Builds RC offer setup help for the TD SR18?
Yes. We're a U.S.-based FrSky dealer and we're happy to walk you through binding, stabilization tuning, and FBUS wiring. Browse our full FrSky receiver range at https://www.fpvbuildsrc.com/frsky-receivers