Mike,

How much is "slightly"? If it is only a few Hz, you can change the offset for the filter a few Hz above and below that printed on the filter label.

73,
Don W3FPR

On 3/25/2020 11:10 PM, mic b wrote:
Hi, I'm an OM from Udine, northern Italy.  I own a K3 and I noticed that
changing the mode from Usb to Lsb the audio tone varies slightly.  It's
normal?  The five-pole filter has the center frequency set correctly as per
the label.  Is it possible to vary the carrier frequency of the sidebands?
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