[Elecraft] KX3 with NaP3 USB Noise

[Matt Zilmer]

Hi,

I used transformers for isolation, which worked fine.  Did not need
anything else.

73,
matt W6NIA

On Mon, 29 Jul 2013 10:59:41 +0200, you wrote:

>I've purchased a USB Creative Blaster X-FI Pro for use with my Acer Win 7
>laptop with the intention to use it with my KX3 driving NaP3.
>
>This works fine until I connect the Elecraft supplied KX3 USB serial cable
>to provide CAT control of the, when connected it introduces unacceptable
>noise in the KX3 audio and many spurs on the NaP3 display. I have tried
>bonding the laptop chassis to the KX3 with no effect.
>
>Is there a fix for this? I know of a mod to this soundcard (additional
>decoupling caps) and/or isolation of the KX3 IQ output by transformers, is
>this likely to cure the problem?
>
>Any advice on this, thanks.
>
>73 F5VJC
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