[Elecraft] K3 psk D splater

[Adrian]

Yes replace the pwr supply cable to a shorter heavier version used with a
15v stiff supply.
100w key tx K3 screen indicated volt drop should not exceed 0.4v .Supply
cable needs to be short and thicker.
Fit a Coilcraft DLFC15 filter in your rs232 line.

Adrian ... vk4tux

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of dmoes at nexicom.net
Sent: Thursday, 31 May 2012 5:18 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 psk D splater

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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