The reason why coaxial wall plates only have one coaxial jack is because using a two-way splitter divides the signal by two. That’s right, the signal strength on both sockets is 50% weaker. It doesn’t matter whether there is something connected to the other socket or not, or what’s connected to it, it’s still half as strong as it was before the splitter on both sockets. In fact, leaving an unused socket open is even worse as it let interference in. Coaxial works with a center conductor that carries the signal, and an outer shielded that protects against EMI and it needs to be sealed (i.e., no open jack, unconnected cable, cut cable, etc.). Any unused jacks or cables should have a 75 ohm termination. So that’s why coaxial jacks only has one socket, and why cable guys only put splitter when really needed. They fix problems every day by people who thought it would be a good idea to put splitters everywhere, and use cheap gold-painted splitters like the one in the tutorial on top of that.
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