This bias tee box is used to insert AC or DC power into an HF signal to power remote antenna preamplifiers (DC), Bi-directional beverages (AC) or other devices. It is usually positioned at the receiving end of the coaxial cable to pass AC or DC power from an external source to the coaxial cable running to powered device. A bias tee consists of a feed inductor to deliver AC/DC to a connector on the device side and a blocking capacitor to keep power supply from passing through to the receiver. Bias tees are used in a variety of applications, but are generally used to provide an RF signal and power to a remote device where running two separate cables would not be advantageous. This box offers something more like: protections, variable attenuator and input common-mode filter.

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Applications
Schematic
PCB
Settings
KIT Assembling
Part list
Product details

Applications

- Providing an RF signal and (AC or DC) power to a remote device over one coax
- You can use bias tee BOX on both sides as power IN and OUT from RF coax
- You can set ATT when you have too high gain of preamp
- Great FOR: preamplifiers, Bi-dir beverages, 4-way antenna switch etc.

example with Preamp Box and Bi-Dir beverage

version with PL SO-239 connectors

version with F connectors

Schematic

PCB

Settings

Variable Attenuator

RF protection

KIT Assembling

version with PL SO-239 connectors

version with F connectors

pcb after assembling all the parts

Part list