RadioLink Electronic Limited
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3.3 Power on F121 Pro
Before powering on F121 Pro, make sure T8S is fully charged. Put the throttle stick at the lowest position and
long press power key to power on T8S. Then power on F121 Pro. Fully charge the 1S LiPo battery first. Plug the
PH2.0 end of the battery into the F121 Pro, then insert the battery into the battery frame under at the bottom of
F121 Pro.
(1) Orange propellers indicates the head of F121 Pro by default. make sure they point to the same direction as
the pilot when powering on and be ready to fly, to ensure safety.
(2) The green LED of F121 Pro will begin flashing when powered on. When it’s off, it means F121 Pro finishes
calibration.
Note
Head direction is determinate. If F121 Pro is calibrated with the direction different from the default, it will
turn back to the default direction automatically when starts flying, that’s what we called Head Front Forward Point
Without Compass.
3.4 Flight Note
If it’s the first time of flying drone, flight mode of Altitude Mode is strongly advised to set. At the Altitude Mode,
when toggle the throttle upward till the drone reaches a certain height and release, F121 Pro will remain at this
height. It’s simpler because pilots only need to toggle the other joystick to make the F121 Pro move
forward/backward or turn left/right. If it’s the Stabilize Mode especially Manual Mode chosen, try to toggle the
joysticks slightly to correct the flight and avoid the drone having sudden moves.
If F121 Pro 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 Pro. For RadioLink
receivers(R8SM/R6DSM) installed on F121 Pro, the LED indicator is blue/purple when it’s SBUS working mode.
3.5 Setup Compatible Transmitters
By factory default, RTF version of F121 Pro is packed with the transmitter T8S and receiver R8SM combo.
Receiver R8SM is also compatible with RadioLink T8FB.
If you ready to change the transmitter to AT10/AT10II/AT9/AT9S/AT9S Pro to control the F121 Pro, 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 Pro, binding
is the only thing needs to be done.
There are three flight modes for F121 Pro including Altitude Mode, Stabilize Mode and Manual Mode. It can be
changed by pressing the three-way switch on the right of T8FB- SWB or of T8S- CH5 as below
