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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