Bias Tee AC/DC BOX by Jan OK2ZAW

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A bias tee is used to insert AC or DC power into an HF signal to power remote antenna pre-amplifiers (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: RF High Pass Filter (100kHz), protections, variable attenuator and input common-mode filter.

Main functions:



Bias Tee AC / DC

The measured values

ATT OFF: SWR, insert loss

ATT set to 10dB: SWR, insert loss

Example with Bias-tee AC/DC BOX and 4-way switch:


Example with Bias-tee DC (AC/DC) BOX and RX preamp box (with front-end protections):



Schematic and board V 0.1: sch brd
Schematic and board V 1.0 (2022): sch brd
Attribution-NonCommercial 2.0 Generic