[Elecraft] KX3-PCKT or Sound Card Interface

[Don Wilhelm]

Lynn,

The KX3 has no isolation (the K3 does have isolation).

What you will normally find is that the isolation will lower the base 
noise level.  How much depends on your computer and soundcard - some are 
pretty good already.

Jim Brown K9YC has good information in his documents on RFI that 
advocate bonding the radio and the computer instead of using isolation 
devices - that works well to, and almost makes using isolation as 
"cheating", but with more and more computers coming in plastic cases, 
the easy way out is to add isolation transformers.
For data modes, most any 1:1 transformers will do the job, but for the 
I/Q outputs do require better transformers to obtain the full bandwidth 
on the panoramic display.

73,
Don W3FPR

On 3/30/2013 2:44 PM, Lynn W. Taylor, WB6UUT wrote:
> I bought the KX3-PCKT cable kit along with my KX3 -- my primary 
> interest is digital modes.
>
> I also see on the list that a lot of you use a sound card interface 
> instead of cables.
>
> If the KX3 has enough isolation, is more isolation needed?
>
> What am I missing?
>
> Thanks in advance....
>
> -- Lynn
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