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Just in case anyone stumbles over this.? I recently had to replace the QCX Atmega chip; this after bricking the original.? I've since learned how to update the chips properly. Initially I thought that audio crackle had been solved with the new chip and firmware, but it has not.

The audio crackle is like hearing lightening strikes while listening to HF DX. I can hear CW and WSPR tones but, really, the crackle is so harsh it makes using the 30 metre QCX? unpleasant.

So, I';m open for suggestions as to how to resolve the issue.

I'm using a 12 volt, fully charged battery, to drive the radio.

Thanks

Barry

GM Barry,

I've 30m QCX without that problem. I built mine with T1 a little different 3, 3, 3, 31 windings instead of 4, 4, 4, 30 windings, but the audio range is fine and sensitivity on a par with the big rig. C1 is not fully open nor closed, so the peak test is OK. For the dip test (I think that was side band rejection) I have to go to one extreme with the variable resistors, but again I seem to have no problem with hearing any opposite side band. I assume you have gone through the alignment menu section of the manual again and ensured you have correct peaks and dips. When I first read that I did not understand the importance of the digit top right, and that had me confused.

Hope you can find the cause and fix the problem.

I'm using 1.00(b).

Yep. ?I’ve gone through the alignment now a couple of times. ?Maybe a third time will prove to be the one! ?I’ll have a look this afternoon. This morning I have to shovel snow!?

I have a second qcx on the way. ? I’ve built and had great success with a number of Han’s kits. ? I have a second QCX on the way. ?I figure I’ll wind T1 before I don a white lab coat to construct the rest of the kit. ?But - they sure are fun

thanks for the reply.

Barry