[Elecraft] K3 psk D splater

[Guy Olinger K2AV]

The short answer is that splatter can be caused by just about anything
between your keyboard and his audio out.

Analyzing just one occurrence is nearly impossible.  There is a lot of good
verbiage in the archives about keeping your signal "clean" and maintaining
a means for inspecting that yourself.  The desired answer to the other
station's report is "I monitor that constantly, and my signal is clean
leaving."

What do you get when you monitor your own signal?  Do you have something to
do that, and do you know how to use it to get correct readings on yourself?

Beyond that, even going through one amplifier means that IMD products will
be down 35 dB for a well functioning amplifier.  When your signal is S3 or
S4, the IMD is way down.  If the other guy was loud, then your primary
signal, even at 25 watts, is likely s9 or maybe even 20 over.  In that case
even that -35 dB can sound like a local signal.

If he's doing what so many people seem to do, run his preamp constantly on,
RF gain max all the time, his RX, even a K3, can add 20 dB to the IMD on
your signal, ESPECIALLY if using SSB filters for RX.

But if you are not perfectly clear and measured about what you are
transmitting, that argument won't go anywhere.

Again, belaboring intentional, trick is to not have any questions about the
signal you are transmitting.  Even better you have graphics on it, and can
send it to him in an email.

73, Guy.


On Wed, May 30, 2012 at 9:13 AM, <dmoes at nexicom.net> wrote:

>  Last evening I was trying another aspect of my K3    I often work PSK
> using AFSK but I thought Id give it a try using PSK-D using Kcomm
>
> I set everyting and it was decoding fine on the K3 display and in
> Kcomm.    There was a strong station that was calling CQ so i gave him
> a call   while having a good QSO he mentioned that I was splattering a
> bit and I should not drive as hard.     rather than explaining that I
> wasnt using AFSK  I just quickly said thanks Ill look into it and 73.
>   Question, What can cause splatter when using PSK-D  I had the power
> dialed to  25W so I certainly wasn.t running to much power,  and just
> to be sure that I was actually using PSK -d I had pulled the audio
> line in/out from the K3. Am I missing something?   I will be trying
> again hooking my other rig up to another computer so that I can
> monitor my output in Fldigi, just in case he was seeing issues at his
> end.
>
>
> David Moes
> VE3DVY
>
>
>
>
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