[Elecraft] KX3 - CW - What's This Sound?

[Pierfrancesco Caci]

Joel Black <w4jbb at charter.net> wrote:
>I'm not sure if I'm hearing a spurious emission or not.  As an example 
>(and I know this may sound weird to some folks - that's just the way I 
>am ;) ):
>
><The following paragraph is *not* the problem - it's what the problem 
>sounds like to me.>
>If I'm on a frequency and someone gets on a frequency pretty far away
>(I 
>don't know how many kHz) I can hear them - I cannot figure out what 
>they're sending, but I know they're there.  It's like I'm on the ragged
>
>edge of their transmit bandwidth.
>
>I'm beginning to hear that on my KX3 and it's me.  I'm not sure if it's
>
>a spurious emission or what it is.  Last night I heard it and it was 
>almost like an echo (not long path), but I could hear tones. I thought 
>someone was calling me.  I'd stop and listen - nothing. I'd send ? - 
>nothing.
>
>This morning, that sound is different.  It's more like someone is not
>on 
>frequency but they're sending CW and I'm at the edge of their transmit 
>bandwidth or just past it.  I can hear it and I know it's there, but I 
>cannot make it out.  This happens with a key or my bug.  After figuring
>
>out I was hearing myself, I had initially thought it was my sending on 
>the bug or something I had out of adjustment, but it doesn't appear to 
>be that.
>
>I tested on the vertical, inverted vee, and dummy load.  I heard it on 
>both antennas, but not the dummy load.  I tried it with the ATU in auto
>
>and bypass with the same results.  I am not using CW in SSB - I am in
>CW 
>mode.
>
>I tested with my K3 at the same power level using the vertical,
>inverted 
>vee, and dummy load.  I did not hear it on any of the three.
>
>The firmware I'm using is 1.54.
>
>I cannot tell you how long this has been going on.  I just recently
>took 
>the KX3 out of the Pelican box and started playing around with it in
>the 
>shack some more.  It may have been doing it a while, it may have just 
>started with 1.54, I have no idea.
>
>73,
>Joel - W4JBB
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Are you maybe using a remote antenna tuner? I hear its CPU clock for a second on some frequencies, after each of my tx. 

-- 
Pierfrancesco Caci