[Elecraft] KPA-1500 ATU operation

[charles at k5ua.com]

After saving my KPA-1500 ATU impedance matching parameters on 80M at 20 
Kc intervals (3.510, 3.530, 3.550, 3.570, etc, etc), I expected that the 
KPA-1500 ATU would automatically switch to the next set of L/C values at 
the midpoint of the 20 Kc segments (like 3.520, 3.540, 3.560, etc, etc), 
but I find that it switches randomly, sometimes just 2 Kc away from the 
main tuning frequencies.  Does anyone have information on how the ATU is 
supposed to work when it is polling the xcvr for frequency?

Thanks, K5UA