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The balanced tuner described in this article has two front-panel adjustments, a turns counter that turns two roller inductors that is connected together with two pulleys and a timing belt and a high voltage capacitor

The L-Network tuner is a simple impedance matching network that consists of one variable inductor and one variable capacitor

I needed a remote antenna coupler that would match the antenna on any frequency from 1.8 to 29.7 MHz including oddball military frequencies

For the variable capacity, I choose an arithmetic progression of capacity with 8 relays, starting from xx pF up to yy pF for the highest capacity, the four smallest capacitors are made of short sections of RG-174/U coaxial cable