Low-Power Antenna Tuner Circuit

  
This antenna tuner is suitable for use with low-power (less than 5 W) transmitters or SW receivers. S2 selects inductance and S2 connects the 365-pF capacitor to either the transmitter or the side of the inductor. The tiny tuner is comprised of a tapped inductor (LI) and a variable capacitor (01), which is connected to the inductor through a center-off SPDT switch (SI).
Low-Power Antenna Tuner Circuit - schematic

That switch arrangement permits the capacitor to be connected to either the input or the output of the circuit.




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