FLYTOP 2.5W 4.9G 5.8G VTX Module User Manual

1. Introduction

The FLYTOP-VT25 is a high-power 2.5W 4.9G/5.8G Video Transmitter (VTX) module designed for FPV (First Person View) applications in racing drones and other RC tools. It features adjustable output power, a wide input voltage range, and OSD/Key tuning modes, providing reliable image transmission for demanding aerial operations.

2. Package Contents

Please inspect the package contents upon receipt. The standard package includes:

• 1x FLYTOP 2.5W 4.9G 5.8G VTX Module (Model: FLYTOP-VT25)
• 1x MMCX Antenna
• 1x Wiring Harness

3. Specifications

4. Safety Information

WARNING: Always connect the antenna to the VTX module before powering it on. Operating the VTX without an antenna can cause permanent damage to the module due to overheating.

• Ensure correct input voltage (6-36V) to prevent damage.
• Observe proper polarity when connecting power.
• Keep the module away from water and moisture.
• Avoid touching the module during operation as it can become hot.
• Some power levels and frequencies may require a HAM radio license for legal operation in certain regions. Consult local regulations.

5. Setup

5.1 Wiring Diagram

Connect the VTX module to your flight controller and power source according to the diagram below. Ensure all connections are secure and correctly polarized.

• DC-IN (6-36V): Connect to your main power source (e.g., LiPo battery).
• GND: Ground connection.
• RX-OSD: Connect to the TX pad of a UART on your flight controller for OSD control.
• OUT5V: 5V output for powering a camera or other low-power devices.
• VIDEO: Video signal input from your FPV camera.

5.2 Antenna Connection

Carefully connect the provided MMCX antenna to the MMCX port on the VTX module. Ensure a firm connection. As a critical safety measure, always connect the antenna before applying power to the VTX module.

5.3 Mounting

The VTX module features mounting holes compatible with both 20mm x 20mm and 30.5mm x 30.5mm stack patterns. Secure the module using appropriate screws and standoffs, ensuring it is isolated from conductive surfaces and has adequate airflow for cooling.

6. Operating Instructions

6.1 Tuning Mode Selection

The FLYTOP-VT25 VTX supports two primary tuning modes: Key button control and OSD (On-Screen Display) control.

6.2 OSD Control (Recommended)

For OSD control, you will typically use the IRC Tramp protocol via your flight controller's OSD menu. Follow these steps:

1. Connect the RX-OSD white wire from the VTX to the TX pad of an available UART on your flight controller.
2. In your flight controller's configuration software (e.g., Betaflight, ArduPilot), navigate to the "Ports" tab.
3. Enable the "IRC Tramp" (or similar VTX protocol) function for the UART connected to the VTX's RX-OSD line. Save and reboot.
4. Access the OSD menu on your FPV goggles/monitor (usually by performing a specific stick command on your radio transmitter).
5. Navigate to the VTX settings within the OSD to adjust frequency band, channel, and output power.

6.3 Frequency and Power Table

Refer to the following table for available frequency channels and corresponding power levels. Note that operating in greyed-out areas may require a HAM license.

Note: Greyed-out areas in the frequency table (as indicated in Figure 6.2) may require a HAM license for legal operation.

6.4 Key Button Control

The VTX module also features a physical button for basic frequency and power adjustments. Specific instructions for button presses (e.g., short press, long press, number of presses for different settings) are typically detailed in a full product manual. Refer to the manufacturer's detailed documentation for precise key operation sequences.

7. Maintenance

• Keep the VTX module clean and free from dust and debris.
• Avoid exposing the module to extreme temperatures or direct sunlight for prolonged periods.
• Ensure proper ventilation around the module, especially when operating at higher power levels, to prevent overheating.
• Regularly check antenna connections for tightness and damage.
• Store the module in a dry, cool place when not in use.

8. Troubleshooting

• No Video Signal:
  • Check all wiring connections, especially power and video input.
  • Ensure the antenna is securely connected.
  • Verify the VTX is powered on and receiving the correct input voltage.
  • Confirm your FPV receiver/goggles are on the correct frequency and band.
  • Check if the camera is functioning correctly.
• Poor Video Quality / Static:
  • Ensure the VTX antenna is not obstructed and is oriented correctly.
  • Check for interference from other electronic components on your drone.
  • Try a different frequency channel, especially if operating near other FPV pilots.
  • Increase the VTX output power if permissible and necessary.
  • Inspect the antenna for damage.
• VTX Overheating:
  • Ensure the antenna is always connected before powering on.
  • Provide adequate airflow around the module.
  • Consider reducing the output power if high temperatures persist.

9. User Tips

No specific user tips were available from provided reviews or Q&A. General tips for FPV VTX modules include:

• Always perform a range check before flying, especially after changing VTX settings or components.
• Use a VTX table in your flight controller software for easy OSD control of channels and power.
• Be mindful of local regulations regarding FPV frequencies and power output.

10. Warranty and Support

For warranty claims, technical support, or further assistance, please contact the seller or manufacturer directly. Keep your proof of purchase for any warranty-related inquiries.