A 2m/70cm diplexer for satnogs ground stations
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README.md

Satnogs Diplexer

A 2m/70cm diplexer intended for use in Satnogs ground stations. It is loosely based on the micro-diplexer by kw4fb. In addition to the high pass filter for 70cm and the low pass filter for 2m, this design also included an additional high pass filter at 120MHz, to eliminate interference by strong FM radio broadcast stations. Each antenna input provides an optional bias-tee to power a the antenna's LNA. See the schematic for details.

The layout file files can be found in the pcb folder. qucs contains a QUCS simulation for the diplexer.

The files are provided under the CERN Open Hardware Licence v1.2.

Filter Design

QUCS schematic

Full band S-parameters Full band S-parameters

2m band attenuation 2m band attenuation

70cm band attenuation 70cm band attenuation

Circuit Boards

PCB top

PCB bottom