A Bi-Directional Amplifier (BDA), also known as a wireless co-frequency repeater amplifier, is a linear, frequency-selective repeater that operates in a full-duplex mode on the same frequency band. It is designed to enhance mobile communication coverage by wirelessly receiving, amplifying, and retransmitting signals between the base station and user devices.

Downlink Operation:

The BDA receives the signal from the base station via the donor antenna located in an area with reliable coverage. The signal then undergoes:

Frequency selection

Low-noise amplification

Filtering

Power amplification

After processing, the amplified signal is transmitted into the target coverage area via the retransmitting antenna.

Uplink Operation:

In the uplink direction, signals originating from within the coverage area are:

Captured by the retransmitting antenna

Amplified and processed using the same method as the downlink

Transmitted back to the base station through the donor antenna

This bidirectional signal flow enables full-duplex communication between base stations and mobile devices such as walkie-talkies.

BDAs are especially suitable for eliminating coverage gaps, such as shadow zones, blind spots, and enclosed indoor areas, where direct signals from the base station cannot reach.

Characteristics

Advanced Filtering Technology: Features high out-of-band suppression, optimized electromagnetic compatibility design, low noise, low spurious emissions, and minimal in-band fluctuation.

Automatic Level Control (ALC): Equipped with ALC technology, allowing for continuous output level adjustment and automatic amplitude stabilization for consistent signal performance.

Low Noise & High Linearity: Engineered for low system noise and excellent linearity, ensuring no interference with base stations or other wireless devices.

Integrated Intelligent Design: Highly integrated module with intelligent control simplifies installation, maintenance, and future upgrades.

Optional Software Monitoring: Can be configured with a software monitoring version for real-time device management and diagnostics.

Visual Status Display: Optional screen and indicator lights provide clear display of operational status.

Broad System Compatibility: Supports major communication protocols including DMR, dPMR, P25, and PDT.