FrSky Tandem X18RS
 
 
TD-ISRM RS RF PERFORMANCE

With solid performance based on the dual-band 900M/2.4G RF signal link with multiple operating combinations of RF modes, the Tandem X18RS versions are equipped with the TD-ISRM RS built-in RF module which is capable of supporting multiple protocols (like TW, TD, etc).
The TD-ISRM RS RF module has the dual 2.4G TW RF mode and supports simultaneous activation of working under ACCESS 2.4G and R9 modes with the same module. In this configuration, the ACCESS 2.4G receiver and R9 receiver can be connected via the SBUS IN/OUT ports to achieve redundant backup. This further enhances the RF signal’s reliability, particularly in long-distance RC operations scenarios.
 
UPGRADED ROBUST ANTENNA HANDLE & EXTERNAL LoRa ANTENNA CONNECTORS

The newly upgraded antenna handle incorporates the good capability of impact resistance facing tough conditions of outdoor fields. The reinforced and thickened antenna casing is better suited for comfort gripping but also does not compromise the antenna’s performance. On the contrary, the redesigned antenna can transmit signal data more effectively, providing pilots with a more reliable flying control experience.
The X18RS is also equipped with 2 external antenna connectors, which can be mounted with additional 2.4G and 900M antennas for enhancing the RF capabilities working under the LoRa modes, to achieve enhanced long-range control.
 
UPGRADED DISPLAY AND COMPONENTS & 45°/60° TRAVEL ADJUSTABLE MC18 GIMBALS

X18RS uses the upgraded 800×480 resolution screen with great visibility under sunlight. The primary components, including trim caps and knobs, are all made from metal, offering rugged quality and enhanced durability for outdoor use. The MC18 Gimbals are also CNC metal mechanized and can be adjusted to a 45° travel position from the original 60° setup out of the box.
Why We Recommend This
The X18RS is the long-range variant of the X18 family — the RS module brings extended 900MHz coverage to the X18 platform, making it the right choice for large-scale pilots who want Tandem X18 ergonomics and the extra range of the RS system without stepping up to the X20. FPV Builds RC provides U.S.-based product support, transmitter-setup assistance, and configuration guidance for FrSky radios purchased through our store.
Frequently Asked Questions:
Which receivers are compatible with the Tandem X18RS?
The X18RS works with all three FrSky receiver families: Tandem (TD) dual-band receivers (TDR10, TDR12, TD SR10, TD SR12, TD SR18) for the best range using 2.4GHz and 900MHz simultaneously; ACCESS receivers (Archer Plus series); and ACCST D16 receivers for legacy compatibility (older units may need a firmware update). Browse the full lineup: https://www.fpvbuildsrc.com/frsky-receivers
What does the RS module add to the X18RS versus the standard X18S?
The TD-ISRM RS module (RS = Range Supremacy) gives the X18RS a dedicated 900MHz-only long-range mode on top of the standard dual-band 2.4GHz/900MHz Tandem link. This pure 900MHz mode is ideal for maximum penetration and extreme range on fixed-wing and FPV missions where the dual-band setup isn't enough.
How does the X18RS compare to the X18, X18S, and X18SE?
The X18RS sits at the top of the X18 family thanks to the RS long-range module. The X18S and X18SE are the core dual-band Tandem radios without the RS module — the X18SE adds a special edition colorway and refined ergonomics over the X18S. The base X18 is the original entry to the X18 line. All four run ETHOS OS and share TD receiver compatibility. See the full lineup: https://www.fpvbuildsrc.com/frsky-transmitters
What firmware/OS does the X18RS run?
ETHOS OS — FrSky's color touchscreen operating system. ETHOS supports OTA firmware updates for bound TD receivers, telemetry widgets, and flexible mixer logic. Regular free updates are available from FrSky's firmware site.
Can I use an external ELRS or third-party module with the X18RS?
Yes — the X18RS features a full-size JR-compatible external module bay. You can run ELRS, R9M, or any JR-format RF module alongside the built-in Tandem system.
What tray and strap accessories are compatible with the X18RS?
The FrSky CNC Metal Tray fits the X18RS: https://www.fpvbuildsrc.com/product-page/frsky-cnc-metal-tray-for-tandem-x20-x20s-x18-series as does the Shoulder Strap: https://www.fpvbuildsrc.com/product-page/frsky-transmitter-shoulder-strap
Does FPV Builds RC offer support for setting up the X18RS?
Absolutely — we're a U.S.-based FrSky dealer. Contact us for receiver selection, binding, and ETHOS configuration help.