QRO.cz Bias Tee Receive Feedline Voltage Injectors are engineered to inject DC voltage into a receive antenna system’s coaxial cable while isolating the radio port from DC current. This allows you to power remote devices—such as preamplifiers, relays, or switching systems—without the need for separate power lines, simplifying your installation by combining RF and DC over a single coaxial feed.

Typically installed at the receiving end of the coaxial cable, the bias tee passes DC power from an external source to the coax line running to the powered device. It uses a feed inductor to deliver DC to the device side and a blocking capacitor to prevent DC from reaching the radio. For added flexibility, bias tees can be used on both ends of the coaxial line to serve as DC input and output points.

Key Features

• All-in-One Signal & Power Delivery - Combines RF signal and DC power over a single coaxial cable—ideal for powering remote preamps or active antennas without extra wiring.

• Advanced Protection Circuitry - Includes diode-based front-end protection, RF voltage/current limiters, and DC short protection to safeguard both your equipment and signal integrity.

• Customizable Performance - Features adjustable attenuation and high-pass filtering to fine-tune your installation, reduce AC noise, and manage high-gain preamps effectively.

Additional Feature and Specifications:

• Frequency Range: 0.1 – 60MHz

• High Pass Filter: 100kHz ( > 40dB @ 25kHz)

• Insertion Loss: < 1dB – for minimal ATT

• Supply Voltage: DC Up to 24VDC

• Supply Current: Up to 500mA

• DC Short Protection: ~1A

• RF Voltage Protection: Up to 90V

• RF Current Protection: Up to 200mA

• Output Protection: RF diode limiter

• Front-End Protection: Diode-based

• Power Supply Common-Mode Filter: Integrated

• Variable Attenuator: Adjustable for gain control

• LED Diode Indicator: DC power status on coax

• Connectors: High-quality UHF female SO-239 connectors