1. Introduction
The Axisflying TERK 3.3G 2.5W Analog VTX is a high-performance video transmitter designed for FPV (First Person View) freestyle and long-range drone applications. It features a dual-core super heat sink for efficient cooling, a built-in microphone, and LED indicators for easy status monitoring. This manual provides essential information for the safe and effective use of your VTX.
2. Safety Guidelines
⚠ Disclaimer:
- This product is intended for recreational use only.
- Illegal modification of drones/planes is strictly prohibited.
- Always adhere to relevant laws and regulations regarding drone/plane usage in your country or area to ensure legal operation.
- Ensure proper ventilation during operation to prevent overheating.
- Do not operate the VTX without an antenna connected, as this can cause permanent damage.
3. Package Contents
Upon opening your package, please verify that all items are present and in good condition:
- Axisflying TERK 3.3G 2.5W Analog VTX Unit
- Wiring Harness
- MMCX Antenna Cable
4. Specifications
General Parameters
| Parameter | Value |
|---|---|
| Type | TERK |
| Frequency | 3.3GHz; A, B2 frequency group, 16 transmission bands |
| Antenna Interface | MMCX |
| Impedance | 50Ω |
| RF Output Power | 25mW, 400mW, 1W, 2.5W@12V/900mA |
| Input Power | 9-28VDC |
| Current Consumption | 12V/900mA (at 2.5W) |
| Operating Mode | Button operation / OSD operation |
| Input Video Impedance | 75Ω |
| Input Video Amplitude | CVBS0.8~1.2VP-P |
| Video Format | NTSC/PAL |
| Weight | 27.5g |
| Product Dimensions | 53.78 x 27.8 x 13.5 mm |
| Max. Transmission Distance | 10KM |
| Transmitter Power (EIRP) | 2.5W |
Dimensions
5. Setup and Wiring
Proper wiring is crucial for the functionality and longevity of your VTX. Refer to the diagram below for correct connections to your flight controller or power distribution board.
Wiring Connections
- DC-IN (7-36V): Connect to your main battery voltage (VBAT) or a regulated power source within the specified range.
- GND: Connect to the ground of your flight controller/PDB.
- DATA: Connect to a UART TX pad on your flight controller for OSD control (e.g., SmartAudio or Tramp Telemetry).
- VIDEO: Connect to the video output of your FPV camera.
- GND: Another ground connection, typically shared with the video signal.
- 5V-OUT: Provides a regulated 5V output, typically for powering your FPV camera.
Always double-check your wiring before applying power to prevent damage to the VTX or other components.
6. Operating Instructions
The TERK VTX can be operated using its onboard buttons or via OSD control (e.g., SmartAudio/Tramp Telemetry) if connected to a compatible flight controller.
Button Description
- POWER Button (Green LED):
- Short Press: Cycles through power levels. The green LED blinks to indicate the current power:
- 1 blink: 25mW
- 2 blinks: 400mW
- 3 blinks: 1W
- 4 blinks: 2.5W
- Long Press (2 seconds): Switches to PIT mode. In PIT mode, the green LED will remain constantly on.
- Short Press: Cycles through power levels. The green LED blinks to indicate the current power:
- Band/CH Button (Red & Blue LEDs):
- Long Press (2 seconds): Switches the frequency group. The red LED blinks to indicate the current group:
- 1 blink: Frequency Group A
- 2 blinks: Frequency Group B
- Short Press: Cycles through frequency points (channels) CH1-CH8 within the selected band. The blue LED indicates the currently selected frequency point.
- Long Press (2 seconds): Switches the frequency group. The red LED blinks to indicate the current group:
Frequency Table (3.3GHz)
| Channel | CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 |
|---|---|---|---|---|---|---|---|---|
| Band A (MHz) | 3060 | 3080 | 3100 | 3120 | 3140 | 3160 | 3180 | 3200 |
| Band B (MHz) | 3220 | 3240 | 3260 | 3280 | 3300 | 3320 | 3340 | 3360 |
7. Maintenance
- Cleaning: Gently clean the VTX with a soft, dry cloth. Avoid using liquids or solvents.
- Storage: Store the VTX in a dry, cool environment, away from direct sunlight and extreme temperatures.
- Inspection: Regularly inspect wiring and antenna connections for any signs of wear or damage.
- Heat Management: Ensure adequate airflow around the VTX during operation, especially at higher power settings, to prevent overheating.
8. Troubleshooting
- No Video Signal:
- Check all wiring connections, especially Video In and Ground.
- Ensure the camera is powered and functioning correctly.
- Verify that the VTX is powered on and receiving adequate voltage.
- Confirm that your FPV goggles/receiver are on the correct frequency band and channel.
- Poor Video Quality/Short Range:
- Ensure the antenna is securely connected to the VTX.
- Check for damage to the antenna or VTX MMCX connector.
- Verify that the VTX power output is set to an appropriate level for your flying environment.
- Minimize interference from other electronic components on your drone.
- Ensure line-of-sight between the VTX and receiver antenna.
- VTX Overheating:
- Ensure sufficient airflow around the VTX.
- Avoid running the VTX at high power settings for extended periods while stationary on the ground.
- Verify input voltage is within the specified range (9-28VDC).
9. User Tips
- For optimal performance, always use a high-quality antenna designed for the 3.3GHz frequency band.
- Consider using OSD control (SmartAudio/Tramp Telemetry) for convenient power and channel changes without needing to access the VTX buttons directly.
- When testing on the bench, use a low power setting (e.g., 25mW) to prevent excessive heat buildup.
10. Warranty and Support
For warranty claims, technical support, or further assistance, please contact your retailer or the official Axisflying customer service. Keep your proof of purchase for any warranty-related inquiries.