Article below is a part of the assembly process of the UHF duplexer – main article is HERE.
Drawing below shows a [AL100] – Copper Plate.
Main purpose of the part is to be a transition between a copper conductor and a [AL100] – 8mm Aluminium End Cap Top. Unless you have a CNC router (or special skills :P) and you can drill all holes perfectly aligned, the best idea is to prepare [AL100] – 8mm Aluminium End Cap Top and [AL100] – Copper Plate together, so all the holes will perfectly align. I used a printed 1:1 drawings to pre-punch holes and then drill them on a pillar drill.
Pictures below show also aluminium end plate as the copper plate is to be made in the same time
using Ox-Gard anti oxidant compound. Aluminium and copper hate each other and this paste will help to keep a good connection between them.