VTX power is one of the most misunderstood specs in FPV. Too little power and you lose signal. Too much and you break regulations. This guide explains everything you need to know to choose the right VTX for your application.
1. What Is a VTX?
A VTX (Video Transmitter) is the component on your drone that wirelessly transmits live video from your FPV camera to your goggles or ground station monitor. It works alongside a VRX (Video Receiver) to form the complete analog FPV video link.
VTX units vary in frequency band, output power, channel count, and form factor. Choosing the right VTX is critical for range, reliability, and legal compliance.
2. What Is VTX Power (mW)?
VTX power is measured in milliwatts (mW) and refers to how much radio frequency energy the transmitter outputs. Higher power generally means longer range and better signal penetration through obstacles.
Common power levels range from 25mW (low power, short range) to 15,000mW / 15W (high power, long range professional use).
Why Power Matters
- Range — Higher power extends your video link distance
- Penetration — More power helps maintain signal through trees, buildings, and interference
- Heat — High-power VTX units require aluminum housings and active cooling fans
- Battery draw — Higher power consumes more current, reducing flight time
3. Frequency Bands Explained
1.2GHz / 1.3GHz
Long-range band with excellent obstacle penetration. Popular for fixed-wing and long-range applications. Requires larger antennas but delivers superior range at equivalent power levels.
1.7GHz
Less common but offers a middle ground between 1.2GHz range and 5.8GHz antenna size. Good for medium to long range applications.
3.3GHz
Growing in popularity for professional UAV applications. Good balance of range and antenna size, with less interference in crowded 5.8GHz environments.
5.8GHz
The most common band for FPV racing and freestyle. Compact antennas, wide channel selection (up to 80CH), but shorter range than lower frequency bands.
7.2GHz
Newest professional band. Offers clean spectrum with minimal interference. Ideal for commercial and government drone operations where spectrum separation is critical.
4. Power Levels Explained
25mW — Pit Mode / Indoor
Minimum power, used for pit mode to avoid interference when multiple pilots are flying. Range: up to 100m in open conditions.
200mW–800mW — Short Range
Suitable for line-of-sight racing and freestyle within 500m. Works well in open environments with minimal obstacles.
1W–2W — Mid Range
Good all-round power level for most FPV applications. Covers up to 1–2km in open conditions. Popular for recreational and commercial pilots.
4W–5W — Extended Range
Used for medium to long range operations. Requires active cooling. Typical range of 2–5km depending on frequency band and antennas used.
7W–15W — Professional Long Range
Reserved for professional commercial operations. Requires robust cooling systems and careful regulatory compliance. Range can exceed 10km under ideal conditions.
5. How to Choose the Right VTX Power
For FPV Racing
Use 25mW–200mW at 5.8GHz. Racing environments are short range and require minimal power. Lower power reduces interference with other pilots.
For Freestyle and Recreational Flying
Use 200mW–1W at 5.8GHz. Provides enough range for typical flying sessions while keeping weight and heat manageable.
For Long-Range FPV
Use 1W–4W at 1.2GHz or 1.7GHz. Lower frequency bands with higher power deliver the best range performance for fixed-wing and long-range quads.
For Commercial / Professional Operations
Use 4W–15W at 1.2GHz, 3.3GHz, or 7.2GHz. Professional operations demand maximum range, reliability, and dedicated spectrum. Always verify local regulations before use.
6. Legal Considerations
VTX power is heavily regulated in most countries. Key rules to know:
- CE certified — Required for use in the European Union
- FCC certified — Required for use in the United States
- Many countries restrict maximum transmit power to 25mW at 5.8GHz for unlicensed operation
- Higher power levels (1W+) typically require an amateur radio license or commercial authorization
- Some frequency bands (1.2GHz, 7.2GHz) require specific licenses in most jurisdictions
Always check your local regulations before purchasing high-power VTX units.
7. Quick Comparison
| Use Case | Recommended Band | Power Level | Typical Range |
|---|---|---|---|
| FPV Racing | 5.8GHz | 25–200mW | <500m |
| Freestyle | 5.8GHz | 200mW–1W | 500m–2km |
| Long Range FPV | 1.2GHz / 1.7GHz | 1W–4W | 2–8km |
| Commercial Inspection | 3.3GHz / 7.2GHz | 4W–10W | 5–15km |
| Professional Surveillance | 1.2GHz / 7.2GHz | 10W–15W | 10km+ |
8. Final Checklist
- ✅ Frequency band suits your application and range requirements
- ✅ Power level is appropriate for your use case
- ✅ VTX is CE/FCC certified for your region
- ✅ Cooling is adequate for your chosen power level
- ✅ Compatible with your VRX receiver
- ✅ Smart Audio / IRC Tramp supported if needed
- ✅ Input voltage matches your battery setup
- ✅ You have the required license for high-power operation
Conclusion
Choosing the right VTX power comes down to matching your application, range requirements, and regulatory environment. For racing, keep power low. For commercial long-range operations, invest in high-power, professionally certified equipment.
AERVUE supplies a full range of VTX transmitters from 800mW to 15W, covering 1.2GHz, 1.7GHz, 3.3GHz, 5.8GHz, and 7.2GHz bands — all CE and FCC certified and available for OEM customization.
Looking for a VTX supplier?
AERVUE offers 19 VTX models across all major frequency bands. Factory direct, OEM available from MOQ 20 units.