I may be in error but with any mixing scheme I expect that the mixer
byproducts will always exist. In most cases the manufacture tries to select
mixer frq that will result in these byproducts (aka birdies) to show up in
the least objectionable place. I dare say that some analytical software
does exist that will show, for any combination of mixer frq, where a
"birdie" will exist and even perhaps the magnitude of this product.
Bill Ames
KB1LG
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