Why doesn’t the computer see a 5 GHz router?

The other day I bought a dual-band Wi-Fi router and started to connect etc. It has two networks, one 2.4 GHz, the other 5 GHz. My computer and mobile devices do not see the router with 5 GHz, they see only with 2.4 GHz.

As if in a search for Wi-Fi Devices and PC only see Tp_Link_0D34 (2.4 GHz) but Tp_Link_0D34_5G (5 GHz) does not.

Response

That your router is indeed dual-band, I think there can be no doubt. Although, it would be nice to know the model of the router and in general describe your question in more detail. Especially write the models of devices that do not see the network in the 5 GHz band and the model of the Wi-Fi adapter on the PC.

Usually, in such situations there are two reasons:

Something with the router settings. Perhaps you accidentally disabled the 5 GHz network during the setup process. You need to look in the settings, perhaps change the network name (SSID) and the channel on which this network works. It is best to reset the router. Also pay attention to the indicators on the router. I don’t know what kind of router you have, but there are usually two wi-fi indicators: one for the 5 GHz network and one for the 2.4 GHz network.
The second reason, the most popular one, is that devices that can’t see the network in the 5 GHz band don’t support that band. Perhaps the Wi-Fi adapter on your computer is without support for 5 GHz Wi-Fi. I would be able to advise here in more detail if I knew the models of your mobile devices and the adapter itself, which is connected to the PC. Whether there is Wi-Fi 5 GHz support or not, you can easily find out by looking at the specifications. Usually support for the Wi-Fi 802.11ac standard is indicated. If the device supports this standard, it should be able to see networks in the 5 GHz range.

I have already written about this in a separate article: Why a laptop, smartphone, or tablet does not see a 5 GHz Wi-Fi network.