Article below is a part of the assembly process of the UHF duplexer – main article is HERE.
Drawing below shows a [AL100] – 8mm Aluminium End Cap Top.
Main purpose of the part is to protect everything what is inside of the duplexer’s cavity and also to support a copper plate together with a copper conductor – the main resonance element. 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.
![](https://www.rozenek.com/wp-content/uploads/2022/11/AL100-8mm-Aluminium-End-Cap-Top.png)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-8mm-Aluminium-End-Cap-Bottom-cutting-material-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-Copper-Plate-punching-a-copper-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-8mm-Aluminium-End-Cap-Top-punching-aluminium-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-Copper-Plate-Driling-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-8mm-Aluminium-End-Cap-Top-together-with-copper-ready-for-turning-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/PXL_20221009_160603769-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/PXL_20221009_172304988-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/PXL_20221009_175735290-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/image.png)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-8mm-Aluminium-End-Cap-Bottom-turnning-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/AL100-8mm-Aluminium-End-Cap-Bottom-turnning-2-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/image-1.png)
![](https://www.rozenek.com/wp-content/uploads/2022/10/PXL_20221013_085840070-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/PXL_20221014_193852853-scaled.jpg)
![](https://www.rozenek.com/wp-content/uploads/2022/10/ox-gard-anti-oxidant-compound-scaled.jpg)
using Ox-Gard anti oxidant compound. Aluminium and copper hate each other and this paste will help to keep a good connection between them.