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

[Joel Black]

I tried different coax cables.  I tried bypassing the wattmeter.  I 
tried just going directly to the antenna - any of the antennas and had 
the same result.  I tried different QSK delays and turned VOX off.  
Nothing seemed to alleviate the issue.

I cannot tell for certain, but I do *not* think I can hear this through 
the speaker in the bottom of the radio.  Again, it's too hard to tell 
for certain.  However, I did find that if I turned down the AF gain, the 
noise, for the most part, was diminished.

I have my MON set to 6.  My AF gain is now at 2 and I can barely hear 
what I described before.  Leaving the MON at 6 and turning up the AF 
gain, the problem is louder.  Changing the MON level does not increase 
or decrease the noise I heard previously.  Only by adjusting AF gain 
down, can I really reduce the noise.

Can anyone think of something else to check?

73,
Joel - W4JBB

On 9/5/13 11:42 AM, Elwood C. Downey wrote:
> It might RF feedback. For me it was especially apparent when running the Olivia digital mode. I could hear a
> faint warbling sound accompanying the correct tones, sort of like an echo but not exactly. It was also there
> on other modes but less obvious. It disappeared when I used my dummy load. I finally traced it to a bad
> connector on the coax run to the antenna. After fixing that the sound is perfectly clean now.
>
> 73, Elwood, WB0OEW
>
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