Elecraft KXPA100 Manual - Manual (Page 42)

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Since retuning is normally required over a narrower frequency range on the lower frequencies to maintain a low
SWR, the lower frequencies have narrower segments assigned as follows:
 Below 3 MHz the segments are 10 kHz wide.
 From 3 MHz through 26 MHz the segments are 20 kHz wide.
 From 26 MHz to 38 MHz the segments are 100 kHz wide.
 From 38 MHz to 60 MHz the segments are 200 kHz wide.
The ATU also stores the antenna connector that you selected for each band.