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

[Wayne Burdick]

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