FrSky Tandem X18
 
Step up to a transmitter that won't hold you back. The FrSky Tandem X18 is built for intermediate and advanced pilots flying scale aircraft, complex aerobatic models, sailplanes, and anything demanding reliable long-range control with serious channel depth.
 
The X18 runs FrSky's Tandem dual-band RF system — 2.4GHz and 900MHz operating simultaneously via FHSS. Both bands are always active; no switching required. Paired with ETHOS, you get a modern firmware platform with deep logical switch programming, telemetry widget customization, and clean model management. The X18 supports 24 channels and pairs with the full TD receiver lineup: TDR10, TDR12, TD SR10, TD SR12, TD SR18, and more.
 
Tandem Dual-Band RF (2.4GHz + 900MHz)
FrSky's Tandem technology transmits on both bands simultaneously. The 900MHz band extends range well beyond 2.4GHz alone — ideal for large-field flying, long-range FPV, or any scenario where link reliability matters. No mode selection needed; both bands work together automatically.
 
ETHOS Operating System
The X18 ships with ETHOS, FrSky's current-generation OS. ETHOS supports logical switches, advanced telemetry display, model wizards, and over-the-air firmware updates. It runs cleanly on the X18's display and is actively maintained with regular releases. Pilots upgrading from OpenTX will find the transition well-supported.
 
24 Channels, FBUS and S.Port Telemetry
With 24 channels, the X18 handles complex aircraft without compromise — flaps, retracts, crow, differential ailerons, multi-mode flight. TD receivers output via FBUS for low-latency telemetry, with S.Port for legacy sensors. Current, voltage, GPS, variometer, and airspeed data all display on ETHOS telemetry screens.
 
Ergonomics and Controls
Rounded, comfortable hand grips, a stable flat-bottom case, and easy-reach sliders and switches. Four standard stick trims plus two additional trims give fine attitude control flexibility. Integrated flash storage simplifies model backup and transfer.
 
Why We Recommend the X18
At FPV Builds RC, the X18 is our go-to recommendation for fixed-wing pilots stepping up to Tandem dual-band. It delivers genuine range and reliability at a strong value point — enough radio for sailplanes, warbirds, and complex aerobats, with ETHOS depth that grows with you. U.S.-based support, receiver selection help, and ETHOS setup guidance included with every purchase.
 
Frequently Asked Questions:
 
What is the difference between the X18, X18S, and X18SE?
The X18 is the core Tandem dual-band radio — 2.4GHz + 900MHz, 24 channels, ETHOS, full TD receiver compatibility. The X18S adds an integrated stabilization module. The X18SE is a special edition with additional feature refinements. All three share the same RF core and ETHOS platform.
 
Which receivers are compatible with the Tandem X18?
The X18 works with the full FrSky Tandem (TD) receiver lineup. Popular pairings: TDR10 for sport aircraft, TDR12 for more channels, TD SR18 for scale and turbine models. Browse all compatible receivers here: https://www.fpvbuildsrc.com/frsky-receivers
 
What firmware does the X18 run?
The X18 runs ETHOS, FrSky's current-generation OS with logical switches, advanced telemetry, model wizards, and OTA firmware updates. Actively maintained by FrSky. Our support team can walk you through the transition from OpenTX if needed.
 
Can I use the X18 with a metal tray and shoulder strap?
Yes. FrSky makes a CNC metal tray for the X18 and X20 series that mounts a neck or shoulder strap for extended flying. See the tray here: https://www.fpvbuildsrc.com/product-page/frsky-cnc-metal-tray-for-tandem-x20-x20s-x18-series
 
Can I add an ELRS or external module to the X18?
Yes. The X18 has a JR-format external module bay. Install an ELRS module, multiprotocol module, or other compatible RF modules to fly aircraft bound to non-FrSky protocols. The internal Tandem RF system operates independently.
 
Does the X18 work with the FrID Remote ID module for FAA compliance?
Yes. The FrSky FrID module is compatible with the X18 and provides FAA-compliant broadcast Remote ID for aircraft over 0.55 lbs. Pairs with the FRIAS companion app and integrates cleanly with ETHOS.
 
What type of aircraft is the X18 best suited for?
Fixed-wing scale aircraft, sailplanes, large aerobatics, and any airplane where dual-band reliability and 24-channel depth matter. The TDR10 and TDR12 are popular pairings for sport and trainer builds: https://www.fpvbuildsrc.com/product-page/frsky-tdr10-2-4g-900m-tandem-dual-band-10-channel-receiver
 
Does FPV Builds RC offer support for setting up the X18?
Yes. Every FrSky transmitter from FPV Builds RC includes U.S.-based technical support. We help with ETHOS setup, receiver binding, telemetry configuration, and model programming. Reach out any time after your purchase.