Small 3-way RX splitter / combiner board

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The splitter or combiner is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads. Like all passive splitters and combiners, this device is less than ideal. Isolation is maximum only when at least one port are properly terminated. In this case isolation between the three splitted/combinated ports is maximum when the main port is properly terminated. This HW is designed only for RX line. Both impedances 50 or 75 Ohm can be selected by the jumper.

Main functions:




The measured values

IO to port 1

IO to port 2

IO to port 3

Isolation port 1 and 2

Isolation port 1 and 3

Isolation port 2 and 3

Port 2 to IO

Port 3 to IO

Also available without enclosure


3-way splitter
Schematic and board pic 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