If you don't know how to guild that Signal Interceptor in "The Molecular Level"... this is how I build mine.
Make sure you have 27 power. I build a dedicated generator farm of 6 medium generators to make sure I have enough.
All generators have to be connected with wires and all devices have to be wired up.
List of what you need:
27 Power (e.g. 6 medium Generators)
Molecular Beam Emitter
Stabilized Reflector Platform