Re: various squeak flutes that about it do not hear +- 4mhz +-4.2 mhz +-4.3…
I am very happy to have had a look at your wonderful site. It is a nice feeling to see a borad being made by some one else.
However I noticed that the complete board shows that is is not ver3 but Ver2 with only a balanced mixer. The second coil is lacking in mixer stage. I too experienced a bit higher level of spurii in balanced mixer config. The ver 3 with a doubly balanced mixer is nevertheless a better performer. Since you have already come this far just add another balun/ binocular coil to mixer.
Let us know how it turns out.
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