I own s/n 1997 which came with the 5 pole BPF marked with an offset of -0.83
I set it to this, and the radio seemed to work fine, but a friend who has a very precise spectral display noticed that my audio passband wasn't symmetrical. We were able to "tweak" the offset to -0.87 which seemed to correct this observed unbalance. Then when I recently downloaded your latest software upgrade, we noted that the -0.87 now seemed off centered, and, by changing the offset back to the -0.83 offset, the audio re-centered in the audio passband. Just wanted to pass this info along to you, as I don't think I saw any reference to it on line. 73, Ron AE6RH
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