It is a low power USB device, because it does not power anything in the
rig. The only connections are TX data, RX data and common (ground)--see
page 5 of the KX3 manual. It won't strain either of those USB hubs.
--Tim (KR0U)
I bought a Mac with only four USB ports and am going to purchase a powered hub.
One of the hubs offers seven ports, but only 2 A for all the ports. The
four-port version offers a full 500 mA per port.
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