I use several HP Elitedesk SFF computers in my office and ham shack. I like
them because of reasonable size, I5 or I7 processors, room for a second
internal drive and a plethora of USB ports. I buy these second-hand from a
thrift shop. They get them from companies that are upgrading their hardware.
The thrift shop has an IBM retiree, who I've gotten to know, who refurbishes
the computers and will even configure one to my needs. Because these were
corporate units, that ran on wired networks, they don't have WiFi, so I use
WiFi dongles to connect to my home network.
Unfortunately, none of these are Win 11 compatible, so I contacted my buddy and
found a newer generation one with a processor that Win 11 likes. I've been
slowly loading all of my programs onto the new one so that I can do a switch
into the hamshack with minimal downtime. I just plugged in a new WiFi dongle
and it didn't work. So I swapped in the one from the old shack computer and it
didn't work either. I put the new adapter into the shack computer and it
worked fine. After a bunch of fussing I learned that the USB port on the newer
computer that I was using is a USB 3.0, where the same port on the old computer
is 2.0. If I put the adapter in a 2.0 on the newer computer it connects just
fine.
This may be common knowledge but it was news to me. After some research I
learned that USB 3.0 generates enough RFI to interfere with 2.4 GHz WiFi.
https://www.usb.org/sites/default/files/327216.pdf
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