Rin Cat (鈴猫)

They all followed the realtek built-in data set as hard limit. WiFi control system can set their limit too, but it may or may not works.

I only found where it init, but no idea where the 30 come from. https://github.com/RinCat/RTL88x2BU-Linux-Driver/blob/3a6f393adda93ab0bc8998c8efc9cb8e438e04b4/core/rtw_mlme_ext.c#L171

The 30dbm seems come from firmware https://github.com/RinCat/RTL88x2BU-Linux-Driver/blob/f9085c8a656f48022e7985f19e7113357597e952/hal/hal_com_phycfg.c#L4083-L4089

It should works now.

I would say it could easily run over 300Mb/s down/up if your 5GHz WiFi is good. The only time you want to use USB3.0 is to achieve more than 480Mbps,...

The old no band name one I have just broken, so I get a new cheap T3U plus. In my area, USB 2.0, default  USB 3.0, `rtw_switch_usb_mode=1` ![USB...

Looks like you are trying to connect restricted WiFi channels, and got timeout. You can try use 2.4GHz WiFi or use common available channel like 36 for 5GHz.

Which 5G channel you are using?

No, it support both 2.4G and 5G.

But some 5G channels are restricted by regulations, which you may not able to use them if you are in some countries.