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IN to Coax
DC in, decoupled by 1n 10n 100n 100n, +ve through 12 turns 18swg copper on FT37-43,? decoupled by 1n, 10n 100n 100n, +ve through 6 turns 18swg copper on FT37-43, +ve to coax inner.
RF in through 100n 1200v cap to coax inner

OUT from coax
DC out? from coax inner through 12 turns 18swg copper on FT37-43, decoupled with 1n 10n 100n 100n, +ve through 6 turns 18swg copper on FT37-43, decoupled by 1n 10n 100n 1000n, to +ve supply ATU-100
RF out from coax inner through 100n 1200v cap to RF input ATU-100
?
measure for unwanted resonances before using in anger.