And you missed that Jim was talking about the RECEIVE station overdriving
the sound card for decoding. ;-)
Both sides need to have the correct settings before making judgments.
Rick wa6nhc
-----Original Message-----
From: iain macdonnell - N6ML
On Wed, May 30, 2012 at 9:42 AM, Jim Brown <j...@audiosystemsgroup.com>
wrote:
> On 5/30/2012 6:13 AM, dm...@nexicom.net wrote:
>> Question, What can cause splatter when using PSK-D
>
> Splatter is simply distortion. Anything in the audio chain can cause
> splatter, from the computer to the audio section of the K3. Many
> (most?) computer sound cards will create distortion if turned up too
> high, and turning it up too high can also cause the input of the radio
> to create distortion.
>
> You can hook a scope to the output of the sound card and watch it for
> clipping of the sine wave as you adjust the gain (on the Windows
> PLAYBACK mixer). Turn the gain up until it you just begin to see
> clipping, or until the signal stops getting stronger, then reduce the
> gain until the voltage drops to one half of that value (that is, the
> trace is half as tall). If you don't have a scope, LISTEN to the sound
> card with headphones and make the same adjustment. What you're listening
> for is any harshness that appears when you turn it up, and when you hear
> it, reduce the gain until it sounds half as loud.
>
> Now you're ready to adjust the Line Input gain of the K3 according to
> the K3 manual.
You missed the point - he's not using an external audio feed to the
K3. I've never used Kcomm, but if it operates in "PSK D" mode, it must
be sending commands, with text, to the K3, and the K3 does all of the
modulation.
73,
~iain / N6ML
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