Packing List

Note: T12D is used as an example in the manual. Users can select other RadioLink transmitters such as T8FB/T8S to control the drone.

Parameters

1.Theory of Flight

1.1Transmitter

The two joysticks of T12D correspond to the four basic channels respectively.

Note: All of the following are based onT12D Mode 2 (Throttle on the left stick).

Left joystick

Make the LD-B20 rise or descend by toggling the left stick (THROTTLE) vertically upward or downward and turn clockwise or anticlockwise by toggling the left stick (YAW) to the left or right.

Right joystick

Make the LD-B20 fly forward or backward by toggling the right stick (PITCH) vertically upward or downward and to left or right by toggling the right stick (ROLL) to the left or right.

MODE 2

1.2 Joysticks & Flight Movements

A. Throttle: Rise/ Descend(Note: Take T12D mode 2 as an example)

Toggle the throttle stick (on the left) vertically upward and LD-B20 will rise and toggle the throttle vertically downward, then LD-B20 descends.

B. Yaw: Clockwise/Anticlockwise

Toggle the yaw stick (on the left) to the left and LD-B20 will turn anticlockwise and toggle the yaw stick to the right, then LD-B20 turns clockwise.

Yaw stick to the left, LD-B20 turns anticlockwise

Yaw stick to the right, LD-B20 turns clockwise

C. Pitch: Forward/Backward

Toggle the pitch stick (on the right) vertically upward and LD-B20 will fly forward and toggle the pitch stick vertically downward, then LD-B20 flies backwards.

Pitch stick upward, LD-B20 moves forward

Pitch stick downward, LD-B20 moves backward

D. Roll: Right/Left

Toggle the roll stick (on the right) to the left and LD-B20 will fly to the left side and toggle the roll stick to the right, then LD-B20 will fly to the right side.

Roll stick to left, LD-B20 fly to the left side

Roll stick to right, LD-B20 fly to the right side

2.Flight Controller Channel Introduction

3.Transmitter Switch Introduction

LD-B20 comes with RadioLink T12D transmitter. Here is the introduction of the switches of T12D:

SWA: Push it up to disarm the drone. Push it down to arm the drone. NULL in the middle. Corresponding to AUX1 of the flight controller.

SWB: Stabilize mode. Corresponding to AUX2 of the flight controller.

SWD: Push it up to turn off the turtle mode. Push it down to turn on the turtle mode. Corresponding to AUX3 of the flight controller.

VRA: Turn it fully counter-clockwise to turn off the lights; turn it clockwise to switch 7 light colors. Corresponding to AUX4 of the flight controller.

When the trim values on the screen of T12D are not 0, please adjust the trim values to 0 by using the four trim buttons (as shown above). For more details, please refer to the detailed manual of T12D: https://www.radiolink.com.cn/t12d_manual

4.Arm and Disarm LD-B20

Arm LD-B20

Power on LD-B20 with the 4S lipo battery that comes with it. After powering it up, place LD-B20 on the ground and keep it stationary for self-check. A solid red LED on the flight controller indicates that the drone is ready to be armed. (If the red LED is flashing, there is pre-arm failure. Please refer to the 15. Troubleshooting or connect the flight controller to Betaflight configurator to check the pre-arm failure and solve it.)

Make sure the throttle is at the lowest position. Push SWB to any position. Then push SWA down to the lowest position, and the propellers start to rotate at idle speed indicates arm successful.

Note: The throttle stick must be in the lowest position when arming.

LD-B20 propellers start to rotate at idle speed indicates arm successful

Disarm LD-B20

When the flight is finished, push up SWA to disarm LD-B20. LD-B20 propellers stop rotating indicates disarm successful.

Note: During the flight, the motors/propellers will stop immediately if SWA is pushed up. Please pay attention to avoid hitting people and damaging valuables.

LD-B20 propellers stop rotating indicates disarm successful

5.Two Working Modes

5.1Stabilize mode

In Stabilize mode, the throttle corresponds to the drone power. The more the throttle stick is pushed up, the greater the climbing power. If you want the drone to maintain the same altitude, the pilot needs to practice for a period of time to achieve it through flight operations.

5.2Turtle mode

If the drone suffers a collision or operational error that causes it to flip over—leaving it unable to fly up—you can activate turtle mode to flip it back, so it can take off. First, push SWA up to disarm the drone, and the propellers stop rotating. Next, push the throttle stick to the lowest position. Then, push SWD down to activate the turtle mode. Finally, Push SWA switch to the lowest position to arm the drone. If the propellers remain stationary, you have successfully entered the turtle mode. If the propellers start to rotate at idle speed instead, it merely indicates that the drone is armed. Please repeat the above steps to activate the turtle mode.

After the turtle mode is activated, move the roll or pitch stick to flip the drone. After the drone flips back to the level, push SWD up to exit the turtle mode. Push SWA up and then down to arm the drone, and take off.

Note: When turning on/off the turtle mode, the throttle stick must be at the lowest point. Otherwise you cannot turn on/off the turtle mode.

6.LED Strip Switch

LD-B20 has a tail LED strip. VRA is used to turn off the LED light or switch the colors. Turn it fully counter-clockwise to turn off the lights and turn it clockwise to switch 7 light colors, including purple, orange, red, yellow, green, cyan, and blue.

7. Low Battery Alarm

LD-B20RTF version comes with a RadioLink R16SM receiver. R16SM supports model battery telemetry function. During the flight, the battery voltage of the drone can be viewed on the screen of T12Dtransmitter. The alarm voltage for the power battery is 14.5V for T12D by default. When the battery voltage is lower than 14.5V, T12D will make “DDD” sounds as a unit to warn. Please land the drone in time to replace the battery. If flight continues, the power of the drone will diminish significantly—eventually rendering it unable to fly. Such a scenario constitutes a state of severe battery over-discharge. It is strongly recommended to land and replace the battery as soon as the voltage reaches 14.5V. After landing, please disconnect the power and replace the battery in time to avoid over-discharge of the battery.

Note: If you want to modify the alarm voltage, please refer to the detailed manual of T12D: https://radiolink.com.cn/t12d_manual

8. Motor and Propeller Installation

To make the drone fly, motors usually rotate clockwise (CW)/counterclockwise (CCW) with the propellers.It is very important to make sure about the rotation direction as below when installing motors. Otherwise, the drone would fail to take off.

Motor and propeller installation can be skipped as LD-B20 is already assembled by factory default. If any of the motors is worn out and needs to be replaced, it is essential to identify the correct motor/propeller rotation. Please follow the below picture to install the motor and propeller.

9. Binding (R16SM)

LD-B20RTF version comes with T12D transmitter and R16SM receiver (as shown below).

If it is the RTF version purchased, there is no need to bind because the binding between the transmitter and R16SM receiver is complete by factory default. In addition to T12D, R16SM is also compatible with T16D/T8FB/T8S. If you want to change the transmitter, binding between the transmitter and receiver needs to done first.

Here are the binding steps for RadioLink transmitter and receiver:

① Place the transmitter and receiver(installed on LD-B20) close to each other within 50 centimeters.

② Power on the transmitter and the receiver.

③ There is a black binding button on the side of the receiver. Press it for more than 1 second. When the LED starts flashing, meaning binding process has started. Note: If there are multiple devices of the same model in the same location, it is recommended to turn off the other devices first, and then binding them.

④ The binding is complete when the LED is always on means the binding is complete.

Note: Please always make sure the LED of R16SM is blue, meaning CRSFprotocol. If the LED is red (SBUS working mode), please press the binding button once to change it to blue.

For transmitter and receiver from other brands, please refer to its detailed manual for binding steps.

10.Charger

LD-B20 is packed with Gensace B6 charger to charge the battery.

Gensace B6  Overview:

The connection between the B6 charger and the battery:

Specifications:

Max. Charge Power: 60W

Charge Current: 1-5A, Max. 5A (Auto adjustment)

Max. Storage Power: 3W Discharge, 60W Charge

Input Voltage: 5~20V

Output Voltage: DC 2.5~18V

Max. Input Current: DC 3A

Balance Current: 0.4A/Cell×2

Input port: QC/PD/BC1.2/TYPE-C V1.4/SDP/CDP/DCP/Apple 5V/2.4A

(does not support 5V/1A adapter input)

Abnormal battery voltage alarm: Yes

Output reverse connection protection and alarm: Yes

Balance port reverse connection protection and alarm: Yes

Supported Battery Types: LiPo/LiHv/LiFe(2~4S), NiMH(2~12S)

Working Temperature: 0~40C

Storage Temperature: -20C~60℃

Dimension:85×55×21mm

Net Weight: Apporx. 64g

Instructions:

1.When connecting a non-smart battery, under the condition that the discharge connector and the balance connector are successfully connected, if you need to enter the charging mode, firstly short press any key to select the battery type, for lithium batteries, then you need to press and hold the CHARGE button for 2 seconds, but for NiMH batteries, you need to simultaneously press and hold the CHARGE and STORAGE buttons for 2 seconds to start the charging mode. After successfully entering the charging mode, the charger will beep, and the charging indicator light will flash at a frequency of 1Hz. The charger does not need to set the charging current. The charger will intelligently adjust the charging current to a suitable charging current according to the battery voltage fluctuation. During the charging process, the battery capacity indicator light will display the current real-time battery status. The charger will beep when the battery is fully charged, and the charging indicator light will remain on.

2.When connecting a non-smart battery, under the condition that the discharge connector and the balance connector are successfully connected. Suppose you need to enter the storage mode, firstly short press any key to select the battery type, then press and hold the STORAGE button for 2 seconds to start the storage mode. After successfully entering the storage mode, the charger will beep, and the storage indicator light will flash at a frequency of 1Hz. The battery capacity indicator light will show the current real-time battery status during the storage process. When the battery storage is completed, the charger will beep, and the storage indicator light will remain on.

3.When the charger is in any working mode. Suppose you need to cancel the corresponding working mode. You need to press and hold the CHARGE or STORAGE button for 2 seconds. After the cancellation is successful, the charger will beep, the charger will return to the idle state, and the battery capacity indicator light charging indicator light, and the storage indicator light will turn off.

If any question when using the charger, please feel free to contact Grepow Inc.

Tel: 9253647166 Fax: +1-925-364-7177 Email: info@genstattu.com

11. Accelerometer Calibration

Accelerometer calibration has been doneby factory default. You can flyit directly without calibration. If you have dismantled the frame or the flight controller, you need to calibrate the accelerometer. The installation direction of the flight controller must be the same as the factory installation direction, otherwise it will be out of control after arming. Please disconnect the power battery during accelerometer calibration, and power on the flight controller with a Type-C cable. Here are the steps of accelerometer calibration:

Connects the flight controller to the computer via a Type_C cable. Open Betaflight Configurator. Click CONNECT on the upper right corner. After the connection, click Setup--Calibrate Accelerometer.

12. The Receiver Connection for LD-B20 PNP

For LD-B20 PNP version, uses need to prepare the transmitter and receiver. The receiver needs to connect to the flight controller. Here is the socket introduction of the flight controller of LD-B20:

If ELRS receiver is used with LD-B20, you can solder ELRS receiver to the serial 4 pad on the flight controller (as shown below). Please connect the flight controller to Betaflight Configurator. After the connection, click Ports, turn on the Serial RX of UART4 and click Save and Reboot. Then click Receiver, set CRSF for Serial Receiver Provider, and save the modifications. The steps are shown below:

If SBUS receiver is used with LD-B20, please connect SBUS receiver to the SBUS signal port of the flight controller (as shown below. RadioLink R8SM receiver is used as an example).

Connect the flight controller to Betaflight Configurator. After the connection, click Ports, turn on the Serial RX of UART2 and click Save and Reboot. Then click Receiver, set SBUS for Serial Receiver Provider, and save the modifications. The steps are shown below:

13. Mode Setting

Click Mode on Betaflight Configurator to set the common functions of the flight controller by using the channels 5 through 12 (or even more). You can configure modes here using a combination of ranges and/or links to other modes. Use ranges to define the switches on your transmitter and corresponding mode assignments. A receiver channel that gives a reading between a range min/max will activate the mode. Use a link to activate a mode when another mode is activates. Exceptions: ARM cannot be linked to or from another mode. Multiple ranges/links can be used to activate any mode. If there is more than one range/link defined for a mode, each of them can be set to AND or OR. A mode will be activated when: All AND ranges/links are active; or at least one OR range/link is active. Remember to save your settings using the Save button.

For example, you canassign a knob switch as the "LEDLOW" (lighting) switch, so that the switch of the 7 colors can be achieved. Set the option within the box on the right to "Auto." Then turn the knob so it will be recognized automatically as the LED lighting switch. The yellow link indicates the LED light is turned off.

14. LED Strip Setting

LD-B20 comes with a LED strip, which is connected to the 3 pin connector near the motor 1. You can set the LED strip. Click LED Strip--Select Wire Ordering Mode--Select the 16 LEDs--Set Arm State for Function--Select the same switch used for LEDLOW (light switch)--Set blue color for Disarmed and Armed--Click Save to save the modifications.

15. Troubleshooting

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