[Elecraft] All Possible Elecraft ATU Tuning Combinations

[Mike Morrow]

Don wrote:

> The KAT2 (and KAT100) has 8 inductors and 8 capacitors to choose from - 
> in 256 steps.  The KXAT1 has only 3 inductors and 3 capacitors - only 7 
> steps.

IMO, a better illustration of the tuning flexibility for the various
Elecraft tuners is gained by computing all possible legal *combinations*
of the relays that are used to switch the reactances.  Almost all of
the resulting component configurations make sense, with only the relay(s)
connecting a capacitor group being superfluous if all the inductors are
shorted or if all the capacitors in the group are open.  So minus these
very few cases, the different combinations are obtained by raising 2 to
the power of the number of switching relays.  Results:

ATU        Switching Relays   Possible Tuning Combinations
KXAT1             7                      128
KAT1             10                     1028
T1               15                    32768
KAT2             16                    65536
KAT3             17                   131072
KXAT3         (Said to be the same as the KAT3)

There's a lot of difference between the lower and upper tiers!

Mike / KK5F