GEPRC RAD Tiny 5.8G 400mW VTX Instruction Manual

Introduction

The GEPRC RAD Tiny 5.8G 400mW VTX is a compact and lightweight video transmitter designed for FPV racing drones. It features adjustable power levels, temperature control protection, and OSD quick parameter adjustment via the IRC Tramp protocol. Its small size allows for versatile installation in various drone builds.

Image: Front view of the GEPRC RAD Tiny 5.8G 400mW VTX board, showcasing its compact design and connection pads.

Package Contents

• 1 x GEPRC RAD Tiny 5.8G 400mW VTX
• 1 x Black 1.13 copper tube antenna
• 1 x SH1.0-5P plug silicone cable
• 1 x SH1.0-3P plug silicone cable
• 1 x This instruction manual

Specifications

Image: The GEPRC RAD Tiny VTX on a digital scale, confirming its lightweight design at 1.1 grams.

Image: Diagram showing the compact dimensions of the GEPRC RAD Tiny VTX: 14.2mm width and 18.7mm length.

Frequency Table

Attention: The antenna must be installed before powering on. If heat is not dissipated in a timely manner during use, the VTX may be damaged.

Image: Detailed frequency table for the GEPRC RAD Tiny VTX, listing channels CH1-CH8 across Bands A, B, E, F, R, and L with their corresponding frequencies in MHz.

Setup and Wiring

Proper wiring is crucial for the functionality and longevity of your VTX. Refer to the wiring diagram below for connection details.

Wiring Diagram

Image: Comprehensive wiring diagram for the GEPRC RAD Tiny 5.8G VTX, showing connections to a flight controller and camera using two different methods. It also details UART settings for setup.

UART Configuration

• Setup: USB VCP (Disabled)
• Config: UART1 (Identified as IRC Tramp, Peripherals set to AUTO)
• Power & Battery: UART2 (Disabled)
• Failsafe: UART3 (Disabled)

Flight Control Connection Methods

The diagram illustrates two primary methods for connecting the VTX to your flight controller and camera:

1. Transmission Method 1: Details connections for RX, VTX, CAM, GND, and 5V from the VTX to corresponding pins on the flight controller and camera. This method typically involves direct wiring for video signal (VID/VOUT), ground (GND), and power (5V) to the camera, and RX/TX for VTX control to the flight controller.
2. Transmission Method 2: Provides an alternative wiring scheme, also connecting RX, VTX, CAM, GND, and 5V. Ensure all connections match the diagram precisely to avoid damage.

Important Setup Notes

• Antenna Installation: Always ensure an antenna is properly installed at the RF output end before powering on the VTX. Operating without an antenna can severely damage the module and shorten its service life.
• Power Supply: Verify the correct input voltage (DC 5V) and polarity before connecting power. Incorrect voltage or reversed polarity can burn out components.

Operating Instructions

The GEPRC RAD Tiny VTX features a single function button and three indicator lights (green for frequency points, blue for channel groups, red for power) for easy parameter adjustment.

Adjusting Frequency, Channel, and Power

1. Enter Frequency Adjustment Mode: Press and hold the side button for 2 seconds. The blue light will flash, indicating entry into frequency adjustment mode.
2. Adjust Frequency Point (CH1-CH8): Short press the button to cycle through frequency points CH1 to CH8. The indicator light will flash a corresponding number of times (e.g., 1 flash for CH1, 8 flashes for CH8).
3. Enter Channel Adjustment Mode: After selecting a frequency point, press and hold the button for 2 seconds again within five seconds. The green light will flash, indicating entry into channel adjustment mode.
4. Adjust Channel Group (Band A-L): Short press the button to switch between channel groups. The indicator light will flash corresponding times:
   • Band A: 1 flash
   • Band B: 2 flashes
   • Band E: 3 flashes
   • Band F: 4 flashes
   • Band R: 5 flashes
   • Band L: 6 flashes
5. Enter Power Adjustment Mode: After selecting a channel group, press and hold the button for 2 seconds again within five seconds. The red light will flash, indicating entry into power adjustment mode.
6. Adjust Output Power: Short press the button to switch between power levels:
   • 25mW: 1 flash
   • 200mW: 2 flashes
   • 400mW: 3 flashes
   • PIT Mode

Once the desired settings are selected, the VTX will save them automatically after a few seconds of inactivity.

Maintenance

• Heat Dissipation: Ensure adequate airflow around the VTX module during installation and operation. Leave sufficient space for air convection to prevent overheating. Overheating can trigger the module's protection, reducing power transmission or even shutting it down, and can lead to permanent damage.
• Antenna Care: Always handle the antenna and its UFL connector with care. Damaged antennas can lead to poor signal quality and VTX damage.
• Cleanliness: Keep the VTX free from dust, dirt, and moisture to ensure optimal performance and prevent short circuits.

Troubleshooting

• No Video Signal:
  • Check all wiring connections, especially power (5V), ground (GND), and video signal (CAM/VTX).
  • Ensure the antenna is securely connected.
  • Verify that the VTX is powered on and its indicator lights are functioning as expected.
  • Confirm that the receiver and VTX are on the same frequency and channel.
• Poor Video Quality (Static, Lines):
  • Check for interference from other electronic components on the drone.
  • Ensure the antenna is not damaged and is positioned optimally.
  • Increase the VTX output power if operating at a low setting (e.g., 25mW).
  • Check for loose connections or damaged cables.
• VTX Overheating / Power Reduction:
  • This VTX has temperature control protection. If it overheats, it will reduce power or shut down to prevent damage.
  • Ensure adequate airflow around the module. Relocate if necessary to a cooler spot or improve ventilation.
  • Verify that the input voltage is stable and within the specified DC 5V range.
• Cannot Change Settings (Frequency/Channel/Power):
  • Ensure you are following the button press sequence correctly (hold for 2s to enter mode, short press to cycle, hold for 2s again within 5s to move to next setting).
  • Check if the VTX is in PIT Mode, which might restrict some adjustments.
  • If using OSD control (IRC Tramp), ensure the flight controller is correctly configured and communicating with the VTX.

User Tips

• Efficient Wiring: Users have noted that this VTX allows for efficient connection and wiring in remote control toys, enhancing their overall performance. Take time to plan your wiring layout for a clean and reliable build.
• Compact Builds: Due to its tiny size, the RAD Tiny VTX is ideal for micro and small FPV drone builds where space is at a premium.
• OSD Control: Leverage the IRC Tramp protocol for convenient OSD (On-Screen Display) parameter adjustment directly from your flight controller, avoiding the need to physically access the VTX button during flight setup.

Warranty and Support

For specific warranty information, please refer to the terms and conditions provided by your retailer or the manufacturer's official website. For technical support or further assistance, please contact the seller or GEPRC customer service.