The Signalink is noisy and the VOX is not needed because you can use the KX3 
VOX.

I highly recommend reading K9YC’s short paper on audio interfacing. He knows 
more about this stuff than I ever will.

http://audiosystemsgroup.com/USB_Interfaces.pdf

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/

On Dec 18, 2014, at 6:19 PM, Ken <[email protected]> wrote:

> 
>> On Dec 18, 2014, at 8:56 PM, Chris Hallinan <[email protected]> wrote:
>> 
>> From some reading, I've heard that an external interface isn't required for
>> the digital modes?  Not sure about that.  Wonder what others are using for
>> external interface for digital modes?  I had a SignalLink USB at one point
>> and it worked quite well.
> 
> 
> Chris,
> 
> One can, at least in theory, get by with feeding the audio directly between 
> the K3 and the computer.  However, from what I’ve read, adjustment is very 
> sensistive and it is more susceptible to hum , RF pickup, etc.  And you have 
> to deal with how your computer handles the audio (mixers, audio enhancement, 
> etc.)    The SignaLink is a good, simple, reliable interface, well worth it 
> IMO.
> 
> Have fun and good luck with your construction.
> 
> Ken WA8JXM
> 
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