Bias Tee BOX by Jan OK2ZAW
A bias tee is used to insert DC power into an HF signal to power remote antenna amplifiers or other devices. It is usually positioned at the receiving end of the coaxial cable to pass DC power from an external source to the coaxial cable running to powered device. A bias tee consists of a feed inductor to deliver DC to a connector on the device side and a blocking capacitor to keep DC 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 (DC) power to a remote device where running two separate cables would not be advantageous.
- You can set ATT when you have too high gain of preamp.
- Connectors can be SO-239, F or adapters PL-239 to F for universal use
- BOX size 100x100 mm
- Available as
- ASSEMBLED and tested
- KIT : all parts + PCB
- PCB only
- As pack with RX preamp Box here
- Supply voltage DC up to 24 V
- Supply current up to 500 mA
- Insert loss lower than 1dB - for minimal ATT
Providing an RF signal and (DC) power to a remote device over one coax You can use bias tee on both sides as DC IN and OUT from RF coax
The measured values
ATT OFF: SWR, insert loss
ATT set to 10dB: SWR, insert loss
Example with Bias-tee DC BOX and Bi-Dir beverage antenna:
Example with Bias-tee DC BOX and Bi-Dir beverage antenna and preamp in hamshack:
Example with Bias-tee DC BOX and RX preamp BOX:
|Bias Tee BOX|
|Schematic and board V 0.1:||sch||brd|
|Schematic and board V 0.2:||sch||brd|
|Schematic and board V 1.0 (2022):||sch||brd|
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic