✅ What Is a VTX Module (Video Transmitter)?

A VTX (Video Transmitter) is an electronic module on an FPV drone that sends live video from the drone’s FPV camera to your FPV goggles or monitor.

🔧 How It Works

1. FPV Camera → captures video
2. VTX → converts and transmits video through radio frequency
3. FPV Goggles/Receiver → receives and displays video in real time

📡 Key Features of a VTX

1. Output Power (mW)

Higher mW = longer range

25mW → short range / indoor / racing

200mW → medium range

400mW – 800mW → long range

1000mW+ → extreme long range

2. Frequesncy Bands

5.8GHz (most common, best for FPV)

2.4GHz / 1.3GHz (long range but bigger antennas)

3. Channels & Bands

VTX uses channels for video transmission, such as:
A, B, E, F, R, Raceband

4. Analog vs Digital

Analog VTX
✔ Low latency
✔ Cheap
✘ Lower image quality

Digital VTX (DJI, Walksnail, HDZero)
✔ HD image
✔ Strong signal
✘ Expensive
✘ Requires compatible goggles

🎥 What FPV Goggles Do

FPV goggles receive the signal from the VTX and show the video in real time.

Types of FPV Goggles:

1. Analog FPV Goggles

Examples: Skyzone, Fat Shark analog models

Works with analog VTX

Shows static / noise when signal drops

2. Digital FPV Goggles

Examples:

DJI Goggles 2

DJI FPV Goggles V2

Walksnail Avatar Goggles

HDZero Goggles

These work with digital VTX systems and give HD video.

🛠️ Popular VTX Modules

Analog

AKK FX2

Rush Tank Solo

TBS Unify Pro

SpeedyBee TX800

Digital

DJI O3 Air Unit

Walksnail Avatar V2 VTX

HDZero Freestyle VTX

📡 How to Connect VTX to FPV Goggles

Analog system:

Power VTX (5V or 9V depending on model)

Connect camera to VTX

Select channel/band by button or Betaflight

Set the same channel on goggles

Video appears in goggles

Digital system:

Bind the VTX to goggles (pairing)

Connect camera → VTX

Power → see HD video

🔋 Tips for Best Video Quality

✔ Use right antennas (RHCP, LHCP, Pagoda, Patch)
✔ Match antenna polarization
✔ Keep VTX cool
✔ Choose a clean channel for flight
✔ Higher mW for long range