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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