I solved the problem originally described below by installing a PCI Express serial port card in my PC. They are expensive, but all the noise is gone. (PC has No PCI slots) Thanks to all who responded.
Monty K2DLJ >I have very high white noise in my K3 on 75 meters when connected to the >serial port computer interface. Removing this connection greatly reduces the >noise. If you use HRD, LP-BRIDGE, or any control software, you can also >hear a pulsing noise related to polling the K3 over the serial port. I >believe this can be lessened, but have not tried as yet. Here in Florida, >USA, the level of thunder storms creates a naturally high noise level in the >summer, but the effects described above are clearly noticeable. I use the >Elecraft KUSB as serial interface.
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