Low-Power Antenna Tuner Circuit

Posted on Sep 20, 2012

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
Click here to download the full size of the above Circuit.

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

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