So you want to build your own gateway? Great idea! Here is the link to FRN (Free Radio Network) which is the software used to power a gateway and key a radio via a PC.
There are many other types of this software now that can be googled if your interested but this page shows the principle of how to get a gateway up and running and gives you the software downloads too. If you click on the "Gateway Downloads" button you will get a link to images / info on current software etc to make a gateway in 2023!
Once you have setup FRN you will need to connect to the server:
001english-eu.ddns.net
Port Number : 10026
Room : English
If you get stuck, shout someone on the channel via Zello! We will always try and help get new Gateways on the air!