GEPRC RAD VTX 5.8G Video Transmitter User Manual

Introduction

The GEPRC RAD VTX is a high-performance 5.8G video transmitter designed for FPV drones. It features adjustable power output, a robust double-layer PCB design for enhanced heat dissipation and interference reduction, and a built-in microphone for real-time audio transmission. This manual provides essential information for the safe and effective use of your RAD VTX.

Features

• Up to 1600mW super power, suitable for long-range flight with good stability.
• Five adjustable power levels: PIT mode/25mW/200mW/600mW/1600mW.
• Two-layer board cooling structure, separating power BEC and main-board to reduce signal interference.
• Temperature control protection function to prevent high-temperature damage.
• Wide voltage input, supporting DC 7-36V (2-8S Battery).
• VTX control protocol is IRC Tramp, supporting OSD parameter adjustment.
• Built-in microphone for real-time transmission of drone sounds.
• Three regional frequency tables (Universal 40CH, American FCC 37CH, European EU 26CH) to meet various regional needs.
• Two function buttons and three indicator lights for easy control.
• Standard 30.5mm x 30.5mm mounting hole.

Specifications

Figure 1: Top view of the GEPRC RAD VTX with dimensions (36.5mm x 36.5mm).

Figure 2: Side view of the GEPRC RAD VTX with dimensions (30.5mm width).

Safety Warnings

• Always install the antenna before powering on the VTX. Operating without an antenna can cause permanent damage to the unit.
• To prevent overheating, ensure constant airflow and a well-ventilated environment. Consider installing a cooling fan if operating in confined conditions.
• The 5V output is exclusively for powering a camera or cooling fan. Do NOT connect the main power input or battery directly to the 5V output, as this will cause serious damage to the VTX.

Setup & Installation

Connector Definitions

• DC 7-36V: Connects to the main battery power (2-8S LiPo).
• GND: Common ground wire for all connections.
• Video: Connects to the video output port of your Flight Controller (FC) or FPV Camera.
• IRC: Connects to a UART TX port on your Flight Controller for IRC Tramp protocol control (OSD parameter adjustment).
• 5V OUT: Provides regulated 5V power output for your FPV Camera or a cooling fan.
• GND: Common ground wire for all connections.

Wiring Diagram

Figure 3: Wiring diagram for connecting the GEPRC RAD VTX to a Flight Controller, Battery, and Camera. Ensure correct polarity and pin assignments as shown.

Figure 4: Pinout labels on the bottom of the GEPRC RAD VTX.

Operation

Button and Indicator Lights

The VTX features two parallel function buttons, which perform the same operations. The indicator lights provide visual feedback on the VTX status:

• Blue Light: Channel (CH) indicator.
• Green Light: Band indicator.
• Red Light: Power indicator.

Channel Selection

Follow the sequence below to change channels, bands, and power levels using the function button:

Figure 5: Channel, Band, and Power Selection Flowchart. A short press (1s) cycles through options, a long press (3s) moves to the next selection mode.

Universal Frequency Table

The VTX supports multiple frequency bands and channels. Refer to the universal frequency table below for available frequencies:

Figure 6: Universal 5.8G Frequency Table (MHz).

Maintenance

To ensure the longevity and optimal performance of your GEPRC RAD VTX:

• Keep the VTX clean and free from dust and debris.
• Avoid exposing the VTX to extreme temperatures or moisture.
• Regularly check all connections for secure fit and signs of wear.
• Ensure adequate cooling during operation, especially at higher power outputs.

Troubleshooting

If you encounter issues with your GEPRC RAD VTX, consider the following:

• No Video Signal:
  • Check all wiring connections, especially Video In and Ground.
  • Ensure the antenna is securely attached to the VTX.
  • Verify that your FPV receiver is on the correct band and channel.
  • Confirm the VTX is receiving adequate power.
• Poor Video Quality/Interference:
  • Ensure the VTX and receiver antennas are compatible and properly oriented.
  • Check for sources of electromagnetic interference (e.g., motors, ESCs, other electronics).
  • Try a different channel or band.
  • Increase the VTX output power if legally permitted and necessary for your flight environment.
  • Ensure proper cooling to prevent thermal throttling.
• VTX Overheating:
  • Ensure sufficient airflow around the VTX.
  • Reduce output power if high power is not strictly necessary.
  • Consider adding a small cooling fan if operating in enclosed spaces or high ambient temperatures.

User Tips

No specific user tips were available from the provided reviews or Q&A content.

Package Contents

The GEPRC RAD VTX package typically includes:

• 1 x GEPRC RAD VTX 5.8G 1.6W/2.5W Video Transmitter
• 1 x 72mm MMCX Copper tube antenna
• 1 x GH 1.25*6P 150mm Connecting cable
• 1 x MMCX to SMA (Internal foramen) connector
• 1 x Matching screw package

Figure 7: Included components in the GEPRC RAD VTX package.

Compliance

⚠️ Disclaimer:

For recreation use only. Illegal modification of drones/planes is prohibited. Please also pay attention to the relevant laws and regulations on the use of drones/planes in your country/area to ensure legal use.

Warranty & Support

For warranty information and technical support, please refer to the official GEPRC website or contact your retailer. Keep your proof of purchase for any warranty claims.