From: Oristo
In reality, USB does not work that way. Here are "real" supported USB speeds:
USB 1.0/Low-Speed: 1.5 Megabits per second (Mbps)
USB 1.1/Full-Speed: 12 Mbps.
USB 2.0/Hi-Speed: 480 Mbps.
USB 3.0/SuperSpeed: 5 Gbps.
USB 3.1/SuperSpeed: 10 Gbps.
Setting some bps is supported for virtual COM (AKA CDC device) to chips (eg. FTDi)
at the other end which interface USB to real serial (RS-422 or 232 or whatever)..
There is no such interface at the STM32 chip in nanoVNA,. Speed is determined by
which USB speed gets negotiated at plugin detection time and buffer sizes implemented.
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Here, I experienced that a USB 5 GHz Wi-Fi dongle was substantially slowed in speed by having a USB mouse plugged into the same hub. So some USB appears to "work that way".
Cheers,
David
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David J Taylor