Radiomaster GX15 ELRS Gemini 2.4GHz

Radiomaster GX15 is a top-tier transmitter with a touch color display on the top and a 2.4 GHz Gemini ELRS transmitter. It is especially appreciated by pilots of RC airplane, helicopter and other models that are not operated via FPV and where a good view of the transmitter display is important.

The main advantage is the mentioned 3.5" IPS touchscreen with 480x320 resolution, 262 thousand colors and 600 nits brightness. It is positioned above the controls, so it is not blocked by the strap or the pilot's hands. Telemetry, timers and model data remain readable even in direct sunlight. The system is powered by an STM32H7 processor, which ensures smooth EdgeTX operation. Data is stored in 512 MB of internal flash memory or on a microSD card up to 32 GB in FAT32 format (an inserted card disables the internal memory).

The internal transmitter module consists of a pair of Semtech SX1281 chips, each with an output of 250 mW. The transmitter module operates in ELRS Gemini 2.4 GHz mode. Antenna switching mode and operation with a single antenna are also supported. ExpressLRS is an advanced open source RC system with long range, low latency and high refresh rate. With compatible receivers, the GX15 can handle a refresh rate of up to 1000Hz. The radio has two integrated antennas hidden behind the display bezel, one horizontal and one vertical. It therefore provides polarization diversity without any protruding antennas. The transmitter module is actively cooled by a quiet fan combined with aluminum heatsinks.

Control is provided by V6 hall gimbals with adjustable stiffness and throw range (38-54° vertical, 30-56° horizontal). The adjustment screws are accessible from the outside without having to disassemble the transmitter. There are six three-position switches, one two-position switch, one momentary switch, two rotary knobs, two sliders, six trims and six buttons for a six-position channel. The side switch modules are replaceable – they can be replaced with momentary buttons or blanked off.

On the back there is a JR bay for an external transmitter module. The built-in gyroscope allows you to control logical switches, gimbals or voice telemetry by tilting the radio, and the built-in microphone is ready for future functions. The USB-C connector is used for charging, simulator connection, firmware updates and data transfer.

The radio is powered by a pair of 18650 cells, or a 2S LiPo battery or 21700 cells – batteries are not included. The charging circuit is designed for cells with a nominal voltage of 3.7 V and a charging voltage of 4.2 V per cell.