[Elecraft] Elecraft K3S usb and USB data only cable

[IK4EWX]

I have seen on the P3 that some little spurs are presents every two three khz
about -125dBm when the K3S dialogue with my Intel NUC pc, when using
Elecraft K3 Utility program or my logging program, winlog32.
I am thinking to use a data only usb cable (without the 5V wire from the pc
power supply, that I presume is causing this low RFI).
Is it possibile to connect the K3S to pc with a data only usb cable?
Does the K3S really need the external 5V? Does the K3S need the third wire
(ground)?
Thanks and 73,
Ian IK4EWX



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