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Note: Please keep the aircraft in the optimal radiation range of the directional antenna at all times

.

                                              FrSky Electronic Co., Ltd.                    www.frsky-rc.com                    Contact us: frsky@frsky-rc.com  

Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China    Technical Support: sales4tech@gmail.com 

01140187

Version

1.0

FrSky TANDEM X20S Manual 

                                              FrSky Electronic Co., Ltd.                    www.frsky-rc.com                    Contact us: frsky@frsky-rc.com  

Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China    Technical Support: sales4tech@gmail.com 

01140187

Version

1.0

FrSky TANDEM X20S Manual 

                                              FrSky Electronic Co., Ltd.                    www.frsky-rc.com                    Contact us: frsky@frsky-rc.com  

Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China    Technical Support: sales4tech@gmail.com 

01140187

Version

1.0

FrSky TANDEM X20S Manual 

Layout

Specifications

●  Dimension: 212*200*95 mm (L*W*H)

●  Weight: 809g (without battery)

●  Operating system: ETHOS

●  Internal RF module: TANDEM

●  Number of Channels: Up to 24 channels

●  Operating Voltage Range: 6.5 ~ 8.4V (2S Li-battery)

●  Operating Temperature: -10

~60

 (14

~140

●  USB Adaptor Voltage: 5V+0.2V

●  USB Adaptor Current: >2.0A 

●  Backlit touchable LCD resolution: 800*480

●  Compatibility: ACCST D16 & ACCESS receivers

Introduction

The Tandem X20S is a pioneering dual-band radio transmitter, it drew on feedback and experience with previous 

radios and adds many new features such as  color touch screen, an ergonomic design that provides unprecedented 

comfort in the hand. On the RF side, we have given it the powerful RF system , the TD dual RF system, which does 

not simply reiterate the combined features of the FRSKY900MHz and 2.4GHz RF systems. The TD is characterized 

by its true simultaneous dual-band remote control with telemetry, enabling incredible and unmatched end-to-end 

4ms latency. This radio ships with Ethos, a completely new system that provides users with a powerful, intuitive, and 

flexible experience that maximizes the fun of the hobby.

Features

●  Built-in TD 900M/2.4G Dual-Band Internal RF Module

    Supports Multiple Working Modes

    

2.4G ACCST D16 Mode (Compatible with ACCST Receivers with D16 V2 or later FW)

    

2.4G ACCESS Mode (Compatible with ACCESS Receivers)

    

900M ACCESS Mode (Compatible with ACCESS R9 868/915MHz Receivers)

    

*Capable of simultaneous working under ACCESS mode

    

2.4G&900M TD Mode      (Compatible with TD Receivers)

    

Super-low latency and long-range control with telemetry

    

*Up to 50 to 100KM range and down to 4ms end-to-end latency

●  800*480 Color Touch-Screen Displays

●  6 Quick-Mode Custom Buttons (Front) and 2 Momentary Buttons (Rear)

●  Lite Type External Module Bay

●  Built-in 6-axis Gryoscope Sensor

●  All CNC Metal Trims, Knobs

●  Haptic Vibration Alerts and Voice Speech Outputs

●  External Antenna Supports SWR indicator warning

●  Supports Recharge System for 2S Li-ion Battery (USB Type-C Interface)

●  High-speed PARA Wireless Training System (Compatible with FreeLink App3.0)

●  High-Precision Hall-Sensor Gimbals with All-CNC Metal Panel

●  ETHOS: The more powerful, Flexible and Intuitive OS for your radio.

    

Clear and Intuitive UI Design

    

Supports Dual Operation Modes of Radio Display (Touch and Non-Touch)

    

Supports Multi-Language Switching

    

Hardware/Software Version and Factory Version Detection

    

Supports running LUA Scripts (in progress)

●  All CNC High-Precision Hall-Sensor Gimbals

●  Built-in Audio Wireless Module

NEW

+X

+Y

+Z

SMA Connector

Infinity 24 Antenna

Recommended 2.4GHz optional 

high-gain antenna for achieving 

higher performance and further 

range.

SMA Connector

Recommended 900MHz optional high-gain antenna for achieving 

higher performance and further range.

Zipp9 (868MHz) / Zipp9 (915MHz) Antenna

+X

+Y

+Z

+X

+Y

+Z

SMA Connector

868MHz

915MHz

2S Li-battery balance charging via USB-C:

The Green LED indicator states:

Led on: in Charging/Led off: end of charge/flash: charge fault

Battery compartment size: 84*41.5*20mm (L*W*H)

Note: 1. Charge the battery with the USB adapter (Voltage: 5V+0.2V Current:

2.0A) when you use the 

              USB charging function.

          2. The lower the initial charging voltage, the better the charging effect is when the voltage 

              difference cells exceed 50 mV between the two.

Navigation Controls

The left navigation control does RTN, SYS, MDL, DISP and Page UP/Down. The right navigation control does 

scroll and enter. Both navigation controls and touch screen can be used to control the system.

DISP

MDL

Create the model
Step 1: 

First go to System Settings, then click Model Select to select the model type.

ETHOS Operating System

Switch

●  SA: 3 positions; Short Lever

●  SB: 3 positions; Long Lever

●  SC: 3 positions; Long Lever

●  SD: 3 positions; Short Lever

●  SE: 3 positions; Short Lever

●  SF: 2 positions; Long Lever

●  SG: 3 positions; Short Lever

●  SH: 2 positions; Momentary, Long lever

You can choose the Switch and define its 

position in the HARDWARE menu.

1.  Micro SD card is not provided with shipment.

2.  USB port is for upgrading, reading/writing 

Micro SD cards and internal memory of radio 

contents and charging

.

3.  Smart Port is for firmware upgrade for all 

FrSky S.Port devices.

Carrying Bar

Module

Bay

Battery

Cover

Earphone Port

Training port

Micro SD Card Port

Smart Port

ANT1

Ext. 2.4G Antenna

ANT2

Ext. 900M Antenna

Type-C USB Port

Stick

Slider

SD

SC

SG

SH

Stick

SYS, 

MDL,

DISP, 

RTN

Slider

SA

SB

SE

SF

Hook

Power Switch

2.4G Internal Antenna

Display Screen

DISP

MDL

Custom button

900M Internal

Antenna

Speaker

SWJ

SWI

                                              FrSky Electronic Co., Ltd.                    www.frsky-rc.com                    Contact us: frsky@frsky-rc.com  

Add: F-4,Building C, Zhongxiu Technology Park, No.3 Yuanxi Road, Wuxi, 214125, Jiangsu, China    Technical Support: sales4tech@gmail.com 

01140187

Version

1.0

FrSky TANDEM X20S Manual 

Step 2: 

Configure the model channel and create the model name.

Model Setup Procedure-Internal Module
Step 1:

 

Touch the screen or use the navigation keys to enter the 
RF system menu.

Choose the INT MODULE. Then turn ON INTERNAL RF, select the OUTSIDE or INSIDE ANTENNA ( Dual internal 
antennas and external antenna work simultaneously while selecting the OUTSIDE ANTENNA.) 
Set the Mode for TANDEM X20S internal RF corresponding to your receiver (ACCESS, ACCST D16).

Internal

Gimbal adjustment

Unscrew the four screws on the back cover of the remote control, open the back cover of the remote control, you 

can adjust Gimbal.

Install the screw

Install the screw

Install the screw

Loosen  the  four  mounting 

screws, rotate the gimbal to 

a suitable Angle, and tighten 

the screws.

Audio bluetooth

This Audio module can have your wireless Bluetooth audio devices connected and functioned as a broadcast.

Open the wireless settings in the ETHOS system menu, select "Audio" and click "Search", then open your 

wireless Bluetooth audio device and bound.

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