The video transmitter (VTX) is a key part of the FPV system, as it transmits video from the FPV camera to the receiver, allowing you to see the images in real time on a monitor or FPV goggles. Here's what to consider when choosing the ideal VTX.
What to Consider When Choosing a VTX
Although analog video quality is lower than HD, analog technology remains popular due to its low latency, compactness, and low cost. Here are the main factors to consider:
1. FPV Signal Quality
The signal quality depends on:
- Quality Antennas : A well-designed antenna greatly improves transmission.
- Receiver Sensitivity : Make sure it is tuned to the correct frequency to avoid interference.
- VTX Precision : High quality VTXs transmit more accurately on the set frequency, improving signal stability.
2. Output Power
The power of the VTX affects the signal range. Here are the common choices:
- 25mW : Ideal for indoor running or short distances, with less interference.
- 200 mW : Ideal compromise for open-air flights.
- 600mW : More powerful, suitable for long-distance flights, but requires attention to local regulations.
3. Transmission Frequencies
Most FPV VTXs use the 5.8GHz band, which offers good quality and compatibility with 2.4GHz radios. Lower frequencies, such as 2.4GHz or 1.3GHz, are suitable for larger drones and provide a stronger signal, but require larger antennas.
4. Channels
Channels are preset frequencies that you can use. If you are flying with other pilots, having multiple channels available helps avoid frequency overlap.
5. Additional Features
Some advanced features can enhance your flying experience:
- Microphone : Some VTXs include a built-in microphone to hear flight sounds.
- Smart Audio : Allows you to adjust the power, channels and bands directly from the glasses or the remote control, a very practical function.
- Power Filtering : Reduces electrical interference, improving signal quality.
- Pit Mode : Allows you to change channels and bands without disturbing other pilots nearby.
- Thermal Protection : Limits power to prevent overheating, protecting the VTX.
6. Compatibility with NTSC and PAL
Modern VTXs support both NTSC and PAL video formats, so this compatibility is now guaranteed and not an issue to consider.
Attention
To protect your VTX and ensure its longevity:
- Always Connected Antenna : Do not turn on the VTX without the antenna, as it may overheat and damage it.
- VTX Protection : If your drone is subject to frequent impacts, use coaxial extension cables to protect the antennas and cables in the event of impacts.
Conclusion
Choose a VTX with the features you really need, without over-investing in options you won’t use. Invest more in a good camera and quality antennas, as these directly impact the video quality and flight experience.
