When selecting a wireless transmission solution for drones or UAVs, customers often ask about OFDM x COFDM, Pixhawk telemetry integration, and performance in obstructed environments. Here we answer the most common questions.

Índice

1º trimestre: Can TX900 be modified to use COFDM technology?

UMA: Não, TX900 is based on OFDM with TDD (Duplex por Divisão de Tempo). É otimizado para low-latency video and bidirectional telemetry and cannot be converted to COFDM.

2º trimestre: Why consider COFDM instead of OFDM?

COFDM is preferred when NLOS performance é crítico, such as in áreas urbanas, terreno montanhoso, or obstructed environments. Its advantages include:

Forte diffraction and multipath resistance
Reliable video transmission in harsh RF conditions
High stability in challenging environments

3º trimestre: OFDM vs COFDM – Key Differences

Recurso	OFDM (TX900)	COFDM
System Complexity	Baixo	Mais alto
Latência	Baixo (controle em tempo real)	Um pouco mais alto
Best Environment	LOS / Semi-LOS	NLOS / Obstructed
Dados + Vídeo	Bidirectional telemetry & Vídeo HD	Video-centric; telemetry may need adaptation
Dúplex	TDD	Usually FDD

4º trimestre: COFDM Solutions for UAVs

If COFDM is needed, nós recomendamos:

Vcan1886 Mini COFDM Module

FDD-based COFDM transmission
Vídeo + data over Ethernet (RJ45)
Suitable for NLOS environments
View Product

Customized High-Power COFDM Options:

300–500 MHz COFDM IP RJ45 Transceiver, 10 Em PA
View Product
336–554 MHz COFDM IP FDD Transceiver, 5 Em PA
View Product

Notas:

Larger/heavier enclosures – less suitable for small UAVs
RS232 data output only; Pixhawk requires RS232-to-TTL conversion

Q5: How to choose between TX900 (OFDM) and COFDM?

Choose TX900 (OFDM) se:

LOS or lightly obstructed environment
Low-latency video and telemetry is required
UAV size and weight are limited

Choose COFDM se:

NLOS or harsh environment
Diffraction and multipath resistance are critical
Slightly larger hardware is acceptable

Q6: Integrating COFDM with Pixhawk

RS232-to-TTL conversion may be needed
Integration requires planning due to limited data ports
Works best when NLOS reliability is more important than minimal latency

Conclusão:
TX900 OFDM modules are ideal for lightweight UAVs in LOS conditions, entregando low-latency video and telemetry. COFDM solutions provide better NLOS performance, but may require larger hardware and additional integration effort for Pixhawk telemetry.