When selecting a wireless transmission solution for drones or UAVs, customers often ask about 正交頻分複用與正交頻分複用, Pixhawk telemetry integration, and performance in obstructed environments. Here we answer the most common questions.

Q1: Can TX900 be modified to use COFDM technology?

一個: 沒有, TX900 is based on OFDM with TDD (時分雙工). It is optimized for low-latency video and bidirectional telemetry and cannot be converted to COFDM.

Q2: Why consider COFDM instead of OFDM?

COFDM is preferred when 非視距性能 很關鍵, 比如在 都市地區, mountainous terrain, or obstructed environments. Its advantages include:

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

Q3: OFDM vs COFDM – Key Differences

特徵	OFDM (TX900)	COFDM
System Complexity	低的	更高
延遲	低的 (real-time control)	稍高一點
Best Environment	LOS / Semi-LOS	NLOS / Obstructed
數據 + 影片	Bidirectional telemetry & 高畫質影片	Video-centric; telemetry may need adaptation
複式	時分雙工	Usually FDD

第四季: COFDM Solutions for UAVs

If COFDM is needed, we recommend:

Vcan1886 Mini COFDM Module

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

Customized High-Power COFDM Options:

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

筆記:

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) if:

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

Choose COFDM if:

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

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