TBS Crossfire? R9 from FrSky ? Ghost from ImmersionRC ? Or older solutions like Dragonlink or HumPRC from Linx? Perhaps the alternative to these long-range radio link tools is Siyi’s FT24 radio control. It measures 19.1 x 17.5 x 6.4 cm for 586 grams without battery. It offers up to 24 channels (12 physical), support for PPM, PWD and SBUS, all in the 2.4 GHz range. It displays telemetry on a 2.8-inch color LCD screen. It houses a memory card and allows OTA (wireless) receiver updates. It has 6 switches and 2 thumbwheels. To power it, its manufacturer recommends 2 Li-Ion 18650 batteries.
Siyi assures that it can carry up to 15 kilometers and that its latency is about 2 milliseconds! The manufacturer does not give any more details, in particular the emission power – which is limited by law to 100 mW in France. A trap door at the rear allows to accommodate modules in JR format like TBS or FrSky transmitters. Convenient to ensure compatibility with equipment you already have.
The FT24 is compatible with the FR Receiver, a 5.15 x 5.38 x 1.3 cm model weighing 20 grams without an antenna, which offers 16 channels on SBUS, and operates on a 5 to 8.4 V power supply. The FR Mini Receiver offers similar features, but measures only 2.4 x 1.5 x 0.3 cm and weighs 1.5 grams (without antenna). It is to be supplied with 5V.