[Elecraft] K3 psk D splater

[dmoes at nexicom.net]

Hi Jim   Thanks    good tips but Keep in mind I am using PSK-D  where 
I am sending serial data to the K3 and letting it do the modulation.  
so there is no audio path from the PC into the K3.       before I had  
the K3 using the sound card was my only option  and even now when 
using AFSK to the K3  I dont believe I have an issue.  It was just 
when I tried to let the K3 handle the modulation that I got this 
response  and as others have pointed out it is very possible y that 
there is someting at his end.   I was just wondering though if there 
was someting I can do to controll the IMD at the K3 when using PSK-D 
as opposed to PSK-A



David Moes
VE3DVY


>
> --- Original message ---
> Subject: Re: [Elecraft] K3 psk D splater
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: <elecraft at mailman.qth.net>
> Date: Wednesday, 30/05/2012 12:42 PM
>
> On 5/30/2012 6:13 AM, dmoes at 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.
>
> 73, Jim Brown K9YC.
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