K3 KIO3 Problem with WSJT-X?

[N4ZR]

I am trying to diagnose a problem with my K3/KIO3 which surfaced during
the ARRL VHF contest.  Previously, I had used this setup for hundreds of
QSOs on HF.

I am using an external Startec USB soundcard.  The KIO3 IN jack is
cabled to the speaker output of the soundcard.  The KIO3 OUT jack is
cabled to the soundcard's LIN IN jack.  Now here's the problem.  When I
transmit with all cables connected, and listen to the monitor on the
headphones, I hear a tremendous blast of polyphonic audio so long as the
KIO3 OUT line is connected to the soundcard.  If I pull that line from
the sound card's LIN IN jack, then the FT8 audio in the monitor sounds
completely normal.

It seems at least possible that the polyphonic audio bleat is being
produced by feedback somehow occurring between LIN IN and LIN OUT on the
KIO3.  Two possibilities - either the sound card has failed in this
peculiar way, or there is some setting, either in my WIN 10 computer's
sound settings or in the K3's settings, that is causing the coupling
between LIN IN and LIN out.

Any suggestions gratefully received

--
73, Pete N4ZR
Check out the Reverse Beacon Network
at <http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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[Joe Subich, W4TV-4]

> It seems at least possible that the polyphonic audio bleat is being
> produced by feedback somehow occurring between LIN IN and LIN OUT on
> the KIO3.  Two possibilities - either the sound card has failed in
> this peculiar way, or there is some setting, either in my WIN 10
> computer's sound settings or in the K3's settings, that is causing
> the coupling between LIN IN and LIN out.
Assuming your USB sound device is *NOT* the Windows Default device:

Open the Windows Sound Control Panel, select the USB Sound device,
select recording -> Listen and make sure "Listen to this device"
is *NOT* checked.

Open Windows Sound Control Panel, select the USB Sound device, select
playback -> levels and make sure any "microphone" input is muted.

> If I pull that line from the sound card's LIN IN jack, then the FT8
> audio in the monitor sounds completely normal.

If you pull the line from the sound card's LIN IN jack, there should
be *NO AUDIO*.  Do you have another sound card connected to the mic
input?  Is MENU:MIC+LIN = ON?  Are you using DATA:DATA_A or are you
using USB?

73,

    ... Joe, W4TV


On 2020-06-15 8:37 AM, N4ZR wrote:

> I am trying to diagnose a problem with my K3/KIO3 which surfaced during
> the ARRL VHF contest.  Previously, I had used this setup for hundreds of
> QSOs on HF.
>
> I am using an external Startec USB soundcard.  The KIO3 IN jack is
> cabled to the speaker output of the soundcard.  The KIO3 OUT jack is
> cabled to the soundcard's LIN IN jack.  Now here's the problem.  When I
> transmit with all cables connected, and listen to the monitor on the
> headphones, I hear a tremendous blast of polyphonic audio so long as the
> KIO3 OUT line is connected to the soundcard.  If I pull that line from
> the sound card's LIN IN jack, then the FT8 audio in the monitor sounds
> completely normal.
>
> It seems at least possible that the polyphonic audio bleat is being
> produced by feedback somehow occurring between LIN IN and LIN OUT on the
> KIO3.  Two possibilities - either the sound card has failed in this
> peculiar way, or there is some setting, either in my WIN 10 computer's
> sound settings or in the K3's settings, that is causing the coupling
> between LIN IN and LIN out.
>
> Any suggestions gratefully received
>

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