Got it, Thomas. For some long forgotten reason I had MIC SEL set to MIC+LIN. 
DOH!

73, Mike NF4L

On 1/27/2012 4:04 AM, Thomas Horsten wrote:
> Mike,
>
> While in data mode, press Menu, dial to "MIC SEL", ensure it's set to "Line 
> In" not 
> "RPL" or "FPL" (right or front panel), now the mic should definitely not be 
> live 
> and if it is (and triggers VOX), you have a problem with your rig and it 
> needs to 
> be fixed before you use data modes again.
>
> The selection is remembered separately for the DATA modes and SSB.
>
> No matter how loud I scream into the microphone I cannot activate VOX whilst 
> in 
> data mode. If the mic was live in data mode it would be appalling, you'd be 
> putting 
> background noise splatter in the PSK31 passband, for example!
>
> 73, Thomas
>
> On 26 January 2012 19:15, Mike <n...@nf4l.com <mailto:n...@nf4l.com>> wrote:
>
>     Data|AFSK A uses SSB mode internally, so the mic is live, I suppose. I 
> have no
>     interface, that was the OP, not me.
>
>     73, Mike NF4L
>
>     On 1/26/2012 9:53 AM, Thomas Horsten wrote:
>     > I don't get it, when you are in DATA mode it takes the Line In signal 
> and ignores
>     > the microphone input if you've configured the rig correctly, any input 
> on the
>     > Microphone line should be completely ignored and VOX should work 100%.
>     >
>     > Still, on the K3 there is absolutely no need for any external interface 
> like
>     > SignaLink (unless you just want to use it for it's built in USB sound 
> card, but
>     > there are many cheaper options available), just hook up the K3 to the 
> PC with
>     > standard audio cables and a serial cable/USB-serial converter, and use
>     soft-keying
>     > (available with fldigi and hopefully other decent digimode programs), 
> this also
>     > gives you full rig control...
>     >
>     > 73, Thomas M0TRN
>     >
>     > On 26 January 2012 14:48, Mike <n...@nf4l.com <mailto:n...@nf4l.com>
>     <mailto:n...@nf4l.com <mailto:n...@nf4l.com>>> wrote:
>     >
>     >     I have an ongoing, long standing problem with using VOX to key the 
> K3 in
>     Data mode.
>     >
>     >     My sound card is a Creative USB dongle. I use a CM500 headset/mic,
>     plugged into the
>     >     back panel. If I get the mix of volume, line in level and VOX gain 
> high
>     enough to
>     >     reliably key the rig, the smallest noise in the room gets to the 
> mic and keys
>     >     the rig.
>     >
>     >     Am I missing something?
>     >
>     >     Mike, NF4L
>     >
>

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