I forgot the SPC, but that appears to need a differential
capacitor that I haven't yet obtained (or made).

Also, ISTR reading somewhere (that I cannot find) that
the SPC arrangement is very lossy, and can result in
3/4 of the power being lost in the ATU itself)

For the other configurations below, I've worked out that I
need only 8 simple on-off switches to effect all the configurations
below, including the safety issue of isolating the antenna from the
TX and earthing it.

"Airy R. Bean" wrote in message
...
I am trying to conceive of a minimal switching scheme to accommodate
the 10 ATU configurations discovered so far....
Straight through
Series C
Series L
Series C-L
"L" network with C on TX side
"L" network with C on ant side
"PI" network
"T" network
Parallel tank, series fed
Parallel tank, parallel fed