remain at this height. It’s simpler because pilots only need to toggle the other joystick to make the F121 move
forward/backward or turn left/right. If it’s the Stabilize Mode chosen, try to toggle the joysticks slightly to correct
the flight and avoid the drone having sudden moves.
If F121 drops by hitting something, toggle the throttle joystick to the bottom position immediately to stop motor
rotation.
Make sure the signal output of receiver is SBUS to ensure normal operation of F121. For RadioLink
receivers(R8SM/R6DSM) installed on F121, the led indicator is blue/purple when it’s SBUS working mode.
3.5 Setup Compatible Transmitters
By factory default, F121 standalone version doesn’t have receiver installed while RTF version is packed with the
transmitter T8S and receiver R8SM combo. Receiver R8SM is also compatible with RadioLink T8FB. If it’s
RadioLink transmitter AT10/AT10II/AT9/AT9S/AT9S Pro used with F121, compatible receiver should be R6DSM.
If it’s transmitters of other brands used, compatible receiver chosen should capable of supporting SBUS output.
T8FB/T8S
RadioLink 8-channel transmitter are well set by factory default with the flight modes. To control F121, binding is
the only thing needs to be done.
There are three flight modes for F121 including Altitude Mode- Low Speed, Altitude Mode- High Speed and
Stabilize Mode. It can be changed by pressing the three-way switch on the right of T8FB- SWB or of T8S- CH5
as below
AT9S Pro/AT9S/AT9/AT10/AT10II
① Enter BASIC MENU, select MODEL TYPE and choose MULTIROTOR
② Return to BASIC MENU, select REVERSE and set CH3 Throttle as REV .
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