[Elecraft] KX3 firmware update (12-kHz audio spur fixed, etc.)

Wed Aug 21 11:54:05 EDT 2013

I tried this firmware yesterday and it curred some audio artifacts I was 
hearing. My guess is that I was picking up some mixing artifacts from 
the 12 kHz spur that made my KX3 audio sound somewhat harsh, almost 
raspy. I especially noticed it with CW notes.

I emailed Wayne about this firmware release and he thought that it might 
help - and it did. I wasn't able to do a side by side comparison, but I 
did switch between firmware releases a few times and I could definitely 
hear a difference. It now sounds warmer and more well rounded, similar 
to my K3. It is a lot less fatiguing on my ears.

I told Wayne that I can't believe I can still hear stuff like this after 
35 years or so in the fire service. Hopefully I can keep it that way.

Thanks to Wayne (and everyone else at Elecraft) for continually 
improving the KX3 experience.

73,
Dave W8FGU

On 08/16/2013 11:54 PM, Wayne Burdick wrote:
> Hi all,
>
> We're putting the finishing touches on a KX3 field-test firmware release that eliminates the 12-kHz audio spur reported earlier this week. I can't hear it, myself, but I can see it on my spectrum analyzer. In our lab tests the spur is knocked down into the noise -- around 20 dB reduction. Hopefully this will do the trick.
>
> The fix we implemented is an improvement on turning on the RX I/Q menu entry. The new method only increases current drain by 3 to 4 mA, while setting RX I/Q to ON increases current drain by about 10-15 mA.
>
> This release also includes corrected "Weaver-mode" SSB receive demodulation (greatly reduced opposite-sideband image), and all of the ATU tuning improvements mentioned earlier.
>
> If you've been bothered by either the Weaver demod issue or the 12-kHz spur, please email me directly so I can send you the new code.
>
> If you sent me a request earlier, and didn't get it yet, that's because I was making further improvements. You're still on my list.
>
> tnx
> Wayne
> N6KR
>
>
>
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