[CQ-Contest] RFI-proof USB Hubs?

[Jim Brown]

On 7/22/2023 4:20 PM, dbmcalpine73 at gmail.com wrote:
> As the number of USB ports I need increases, so does the size of the USB
> hub.  As the USB hub increases, so does the RFI.  I have snap-on cores on
> all cables into the USB hub, but it doesn't seem to matter.  Anyone got
> suggestions for a good reliable bullet proof USB hub, preferably 8 ports,
> Vs. 3.0?

What bands, Dennis?  If HF, I recommend 5-turns through 1/2-in or 3/4-in 
#31 clamp-ons on every cable associated with the unit, including the 
PSU. Also, try to use a unit that runs on a 12V PSU, so that you can run 
it from the 12V bus in the shack (which should use a linear PSU).

Also, make sure that the turns in those clamp-ons are in sequence, not 
scrambled. There are photos in one of my RFI tutorials.

73, Jim K9YC