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One of the BEST new features of Betaflight 3.4 is the ability to connect ANY transmitter to your PC FPV simulator. Yup. Betaflight 3.4 can turn your RC controller into a PC joystick so you can fly your simulator with it.
Spektrum. Radiolink. Taranis. FlySky. Futaba.
Any receiver that can connect to Betaflight can be used as a PC game controller for an FPV simulator.
If you need a cheap F4 flight controller to use as an interface, this is the cheapest one I could find:
http://pirofliprc.com/PyroDrone-HyperLite-F4-Flight-Controller_p_3463.html
Now here are some search terms that are 100% relevant to this topic, so this definitely isn't keyword-stuffing.
How to connect spektrum dX6i to PC
How to connect spektrum dx6 to pc
How to connect flysky i6 to drl simulator
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How to connect futaba transmitter to pc