21 - Diving Deeper Into The Diplexer

Part 2 of the Mixer Mini-Series. Nick M0NTV explores the design and construction of a Diplexer for the IF port of a Double Balanced Diode Ring Mixer. Part 1 is here:    • 20 - Double Balanced Diode Ring Mixer   In terms of DESIGNING the diplexer I actually started with the Diplexer Calculator (Bridged Tee) at: https://www.changpuak.ch/electronics/... I then took these values and also modelled the design in LTSpice. When it came to physically building it I tested the series resonant filter and the parallel resonant filters separately first of all with an S21 sweep on the NanoVNA. This is how I usually test all my filters these days.