带 1x TX 的 cofdm 中继器重放转发器 2 用于扩展范围和障碍绕行的 RX 分集

带 1x TX 的 cofdm 中继器重放转发器 2 用于扩展范围和障碍绕行的 RX 分集

Customized COFDM Repeater System (1TX / 2RX Diversity)

这个 custom-built COFDM repeater is specifically engineered to match the customer’s existing transmitter and receiver configuration, ensuring seamless signal relay, extended coverage, and reliable non-line-of-sight (NLOS) 沟通.

系统体系结构

Input Signal Reception (1st link Side)

• Compatible with customer’s transmitter operating at 915 兆赫 (902–928 MHz ISM 频段)

• 配备 双重的 915 MHz receiving antennas

• 支持 2× RX diversity reception for improved signal stability and anti-multipath performance

Frequency Conversion Module

• 集成 RF BDC (Block Downconverter)

• Converts incoming signal from 915 MHz至 700 MHz频带

• Enhances frequency flexibility and reduces interference

Re-Transmission (2nd link Side)

• Re-transmits signal using a 550 MHz antenna system

• Ground receiver uses 双重的 550 MHz receiving antennas

• Maintains diversity reception on the receiving end for maximum link reliability

主要特点

• ✔ Fully customized to match customer’s TX/RX frequency plan

• ✔ 1× TX / 2× RX diversity repeater architecture

• ✔ Built-in RF Block Downconverter (915 兆赫 → 700 兆赫)

• ✔ Optimized for long-distance transmission

• ✔ Strong NLOS (非视距的视线) 表现

• ✔ Supports obstacle penetration and extended coverage

• ✔ Configurable RF output power: 2W¯¯ / 5W¯¯ / 10W¯¯ (定制)

典型的应用

• Tactical communication systems

• UAV/drone signal relay

• Long-range video transmission

• Urban obstacle bypass deployment

• Temporary communication extension stations

外形尺寸: 少于 200 × 150 × 40 毫米 (excluding protruding connectors)
重量: 大约 900 g – 1 公斤

Bandpass RF filter

RF Filtering Considerations

Since the system operates with two independent wireless links, even though the operating frequencies are separated, additional RF filtering is recommended to ensure optimal performance.

To minimize potential interference, unwanted out-of-band signals, or second-harmonic emissions, it is advisable to install an external 带通滤波器 (带通滤波器) between the antenna and the receiver RF connector.

Band-Pass Filter Design & 安装

• The band-pass filter is typically implemented as a separate external unit, rather than being integrated inside the repeater.

• This modular design allows:

  • Easy replacement or frequency customization

  • Flexible deployment based on field conditions

  • Convenient maintenance and upgrades

If the RF environment is clean and signal quality is stable, the filter can remain as a backup component and does not need to be connected.

技术特点

• Passive device (no power supply required)

• No signal directionality (bidirectional installation supported)

• Simple inline installation between antenna and RF input

• Improves system immunity against interference and harmonics