FrSky TANDEM X20 HD Dual Band Transmitter User Manual

FrSky

TANDEM X20 HD Dual Band Transmitter

Introduction

FrSky Tandem X20 series HD radio system provides the perfect solution for FPV flying and pilots preferring an easier operation with fewer devices. The HD version of the X20 radio system includes an integrated FPV screen supporting 720p 60FPS video quality, removing the need for a standalone FPV screen. When combining the HD 720p 60FPS video with near 0ms low latency digital video transmission technology, the X20 HD radio will provide more enjoyment and confidence when FPV flying tours. The built-in video receiver module is compatible with all HDZero video transceiver (VTX) products.
The X20 HD radio package includes a 5.8G antenna kit. The circularly polarized directional antennas ensure that the radio receives optimum video transmission signals, even in complex RF environments. The HD version of the X20 radio also provides an HDMI output which can be used to easily transfer the HD video to an external monitor or device if required, this provides a great solution if you wish to use your existing FPV goggles which support HDMI-in, removing the need for separate HDZero video receiver attached to your goggles.

**Layout[

](https://manuals.plus/wp-content/uploads/2022/08 /FrSky-TANDEM-X20-HD-Dual-Band-Transmitter-FIG-1.png)**

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 al FrSky S.Port devices.

5.8G Antenna (video transmission)

Specifications

• Dimension: 21320095 mm (LWH)
• Weight: 833g (without battery)
• Operating system: ETHOS
• Internal RF module: TANDEM
• Number of Channels: 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 & TD series receivers
• Resolution & Frame Rate of HD VTX: 720P 60FPS

Features

• Built-in near 0ms latency HD digital video transmission system (720P 60FPS)

  • Supports working with HDZero VTX Race V2 / Whoop / Freestyle, etc.
    (Note: the range is dependent on the VTX power setting in use.)

  • Supports HDMI Output (Mini type interface)

  • 5.8G circularly polarized directional external antennas

• 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 NEWTD 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 Trim Knobs

• Haptic Vibration Alerts and Voice Speech Outputs

• 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

Gimbal adjustment (UpKit version)

Unscrew the four screws on the back cover of the remote control, open the back cover of the remote control, you can adjust Gimbal.

Audio bluetooth (UpKit version)

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.

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: 8441.520mm (LWH)

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[

](https://manuals.plus/wp-content/uploads/2022/08 /FrSky-TANDEM-X20-HD-Dual-Band-Transmitter-FIG-5.png)

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.

ETHOS Operating System

Create the model

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

2. Step: Configure the model channel and create the model name.

3. Model Setup Procedure-Internal Module:
   Touch the screen or use the navigation keys to enter the RF system menu.

4. Step: Set the Channel Range
   The TANDEM RF module supports 24 channels. the channel range is configurable, and it needs to be double checked before use.

5. Step: Set the Receiver Number
   The system will assign you the receiver a number automatically, when you create a new model, and this can be easily changed. The range of the Model ID is 00-63, with the default number being 01. Once the receiver is set to the desired number and is bound to the TANDEM X20 HD, the bind procedure will not need to be repeated unless the receiver number is changed. At this point, set the receiving number to your preferred number and repeat the binding operation.

6. Step : Registration
   In the ACCESS model, select the STATE [Register] into Registration status on radio side. Then Press the F/S button and power on your receiver, and select the “RX Name XX” and [REGISTER] to complete the Registration process then power down the receiver.

7. Step: Automatic binding (Smart Match )
   Move the cursor to Rx1[BIND],and select it, power your receiver, select the RX, and complete the process, the system will confirm “Bind succeed”. (Pressing the “F/S” button is not required in ACCESS to Bind. Please the receiver manual for details).

8. Step: Set Failsafe mode
   There are 3 failsafe modes when enable: No Pulse, Hold, Custom.

  * No Pulse: on loss of signal the receiver produces no pulses on any channel. To use this type, select it in the menu and wait 9 seconds for the failsafe to take effect.
  * Hold: the receiver continues to output the last positions before signal was lost. To use this type, select it in the menu and wait 9 seconds for the failsafe to take effect.
  * Custom: pre-set to required positions on lost signal. Move the cursor to the failsafe mode of channel and press Encoder, then choose the Custom mode. Move the cursor to the channel you want to set failsafe on, and press Encoder.  

Then rotate the Encoder to set your failsafe for each channel and short press Encoder to finish the setting. Wait 9 seconds before the failsafe takes effect.
Notice:

  * When failsafe is disabled on TANDEM X20 HD side, the failsafe set on receiver side will be used.
  * SBUS port does not support the No Pulse failsafe mode and always outputs. Set “Hold” or “Custom” for SBUS port.
7. Step: Range  

Range refers to TANDEM X20 HD range check mode. A pre-flight range check should be done before each flying session. Move the cursor to “STATE”, scroll the Encoder to select “RANGE” mode and press Encoder. In range check mode, the effective distance will be decreased to 1/30. Press the Encoder again, turn to normal state.

Model Setup for TANDEM X20 HD External RF Module

The external RF module can be powered on or off by software. The setup process is the same as that for the internal RF. External modules should be closed when not in use.

FCC
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules

CE
The product may be used freely in these countries: Germany, UK, Italy, Spain, Belgium, Netherlands, Portugal, Greece, Ireland, Denmark, Luxembourg, Austria, Finland, Sweden, Norway, France and Iceland.

FLYING SAFETY

Warning
To ensure the safety of yourself and others, please observe the following precautions.
Have regular maintenance performed. Although your TANDEM X20 HD protects the model memories with non-volatile EEPROM memory (which does not require periodic replacement) and of a battery, it still should have regular check-ups for wear and tear. We recommend sending your system to your FrSky Service Center annually during your non-flying-season for a complete check-up and service.

Battery
Using a fully charged battery (DC 6.5~8.4V). A low battery will soon die, causing loss of control and a crash. When you begin your flying session, reset your transmitter’s built-in timer, and during the session pay attention
to the duration of usage. Also, if your model used a separate receiver battery, make sure it is fully charged before each flying session.
Stop flying long before your batteries become over discharged. Do not rely on your radio’s low battery warning systems, intended only as a precaution, to tell you when to recharge. Always check your transmitter and receiver batteries prior to each flight.

Where to Fly
We recommend that you fly at a recognized model airplane flying field. You can find model clubs and fields by asking your nearest hobby dealer.
Always pay particular attention to the flying field’s rules, as well as the presence and location of spectators, the wind direction, and any obstacles on the field. Be very careful flying in areas near power lines, tall buildings, or communication facilities as there may be radio interference in their vicinity.

At the flying field
To prevent possible damage to your radio gear, turn the power switches on and off in the proper sequence:

1. Pull throttle stick to idle position, or otherwise disarm your motor/engine.
2. Turn on the transmitter power and allow your transmitter to reach its home screen.
3. Confirm the proper model memory has been selected.
4. Turn on your receiver power.
5. Test all controls. If a servo operates abnormally, don’t attempt to fly until you determine the cause of the problem.
6. Start your engine.
7. Complete a full range check.
8. After flying, bring the throttle stick to idle position, engage any kill switches or otherwise disarm your motor/engine.

If you do not turn on your system on and off in this order, you may damage your servos or control surfaces, flood your engine, or in the case of electric-powered or gasoline-powered models, the engine may unexpectedly turn on and cause a severe injury.

Make sure your transmitter can’t tip it over. If it is knocked over, the throttle stick may be accidentally moved, causing the engine to speed up. Also, damage to your transmitter may occur.
In order to maintain complete control of your aircraft it is important that it remains visible at all times. Flying behind large objects such as buildings, grain bins, etc. must be avoided. Doing so may interrupt the radio frequency link to the model, resulting in loss of control.

• Do not grasp the transmitter’s antenna during flight. Doing so may degrade the quality of the radio frequency transmission and could result in loss of control.
• As with all radio frequency transmissions, the strongest area of signal transmission is from the sides of the transmitter’s antenna. As such, the antenna should not be pointed directly at the model. If your flying style creates this situation, easily move the antenna to correct this situation.
• Don’t fly in the rain! Water or moisture may enter the transmitter through the antenna or stick openings and cause erratic operation or loss of control. If you must fly in wet weather during a contest, be sure to cover your transmitter with a plastic bag or waterproof barrier. Never fly if lightning is expected.

Updates

FrSky is continuously adding features and improvements to our radio systems. Updating (via USB Port or the Micro SD card) is easy and free. To get the most from your new transmitter, please check the download section of the FrSky website for the latest update firmware and guide for adjusting your sticks. (www.frsky-rc.com)

References

• FrSky Top Rated RC Hobby Radio, Receiver and RC Model - Lets you set the limits

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