This is a PCB-design + Arduino firmware for an Ethernet-controlled 1:8
RF-multiplexer (SP8T). It allows selecting as output one of eight
input-channels, as commonly used e.g. in timing-laboratories when one
wants to measure many RF-sources (clock outputs like 1PPS or 10MHz) with
a single instrument (frequency or time-interval counter). The unselected channels are terminated at 50 Ohms. The design is for two independent MUX-boards to fit in a 1U 19” rack enclosure together with an Arduino MKR ZERO microcontroller with Ethernet interface. The firmware allows for simple control over http with a browser or e.g. the python requests library.