[Elecraft] K3 psk D splater

[Adrian]

Why does the receive station have a soundcard? He/She does not have to have
one.
I don’t use one to receive on rtty and send on fsk-D.
I can see dirty signals on the P3 waterfall, I don’t need a PC, HRD or any
other PC program nor soundcard.
It has nothing to do with audio lines or feeds as there are none.
The action is as a ky shift keyer and power is the only adjustment.
Obviously many here have no idea what FSK-D is or how it works.

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Rick Bates
Sent: Thursday, 31 May 2012 3:53 AM
To: 'iain macdonnell - N6ML'; jim at audiosystemsgroup.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 psk D splater

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 <jim at audiosystemsgroup.com>
wrote:
> 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.

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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